Articles | Volume 12, issue 2
https://doi.org/10.5194/jsss-12-205-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/jsss-12-205-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular research article
| 
13 Jul 2023
Regular research article |
| 13 Jul 2023
| 13 Jul 2023
Methods to investigate the temperature distribution of heated ceramic gas sensors for high-temperature applications
Thomas Wöhrl
Department of Functional Materials, Zentrum für Energietechnik (ZET), University of Bayreuth, 95440 Bayreuth, Germany
Julia Herrmann
Department of Functional Materials, Zentrum für Energietechnik (ZET), University of Bayreuth, 95440 Bayreuth, Germany
Jaroslaw Kita
Department of Functional Materials, Zentrum für Energietechnik (ZET), University of Bayreuth, 95440 Bayreuth, Germany
Ralf Moos
Department of Functional Materials, Zentrum für Energietechnik (ZET), University of Bayreuth, 95440 Bayreuth, Germany
Gunter Hagen
CORRESPONDING AUTHOR
Department of Functional Materials, Zentrum für Energietechnik (ZET), University of Bayreuth, 95440 Bayreuth, Germany
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Johanna Distler, Thomas Wöhrl, Robin Werner, Michael Gerlach, Michael Gollner, Florian Linseis, Jaroslaw Kita, and Ralf Moos
J. Sens. Sens. Syst., 12, 9–19, https://doi.org/10.5194/jsss-12-9-2023, https://doi.org/10.5194/jsss-12-9-2023, 2023
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Differential scanning calorimetry (DSC) is a widely used tool to analyze thermal material properties. This study focuses on the advancement of a miniaturized DSC chip as an alternative to conventional devices. The first development steps for the integration of a weighing system are shown, starting with model considerations and simulation-based optimization to initial measurements. Three different measurement methods are investigated and show promising results.
Robin Werner, Jaroslaw Kita, Michael Gollner, Florian Linseis, and Ralf Moos
J. Sens. Sens. Syst., 12, 69–84, https://doi.org/10.5194/jsss-12-69-2023, https://doi.org/10.5194/jsss-12-69-2023, 2023
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A high-temperature gauge to simultaneously determine electrical conductivity, the Hall constant, and the Seebeck coefficient was developed. Screen-printed heating structures on a ceramic sample holder generate temperatures up to 800 °C. Heating structures were designed using FEM simulations. The temperature distribution was validated by thermal imaging. Measurements on constantan (reference material) and boron-doped silicon wafer confirm the functionality of the gauge up to 800 °C.
Johanna Distler, Thomas Wöhrl, Robin Werner, Michael Gerlach, Michael Gollner, Florian Linseis, Jaroslaw Kita, and Ralf Moos
J. Sens. Sens. Syst., 12, 9–19, https://doi.org/10.5194/jsss-12-9-2023, https://doi.org/10.5194/jsss-12-9-2023, 2023
Short summary
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Differential scanning calorimetry (DSC) is a widely used tool to analyze thermal material properties. This study focuses on the advancement of a miniaturized DSC chip as an alternative to conventional devices. The first development steps for the integration of a weighing system are shown, starting with model considerations and simulation-based optimization to initial measurements. Three different measurement methods are investigated and show promising results.
Robin Werner, Jaroslaw Kita, Michael Gollner, Florian Linseis, and Ralf Moos
J. Sens. Sens. Syst., 10, 71–81, https://doi.org/10.5194/jsss-10-71-2021, https://doi.org/10.5194/jsss-10-71-2021, 2021
Short summary
Short summary
A novel, low-cost measurement device for simultaneous high temperature measurements of the electrical conductivity and Hall coefficient has been developed. Simulations were used to design a suitable screen-printed planar platinum heating structure that generates temperatures of up to 600 °C. Simulations of the temperature distribution have been validated using thermal imaging. Measurements were compared with data from the literature to validate the functionality of the novel device.
Anastasiya Ruchets, Nils Donker, Jens Zosel, Daniela Schönauer-Kamin, Ralf Moos, Ulrich Guth, and Michael Mertig
J. Sens. Sens. Syst., 9, 355–362, https://doi.org/10.5194/jsss-9-355-2020, https://doi.org/10.5194/jsss-9-355-2020, 2020
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A commercial solid electrolyte gas sensor of the type "Pt|YSZ|Pt, air" based on yttria-stabilized zirconia for colorimetric oxygen detection was operated in optimized dynamic electrochemical modes. Cyclic voltammetry and square-wave voltammetry were used for the detection of NO and O2 in N2 in the temperature range between 550 and 750 °C. Due to the differences of electrode kinetics of the single components it is possible to detect these redox active gases selectively and quasi-simultaneously.
Julia Herrmann, Gunter Hagen, Jaroslaw Kita, Frank Noack, Dirk Bleicker, and Ralf Moos
J. Sens. Sens. Syst., 9, 327–335, https://doi.org/10.5194/jsss-9-327-2020, https://doi.org/10.5194/jsss-9-327-2020, 2020
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In this contribution, an inexpensive and robust impedimetric NOx sensor is presented. The impedance of a functional thick film depends selectively on the NOx concentration in the exhaust but shows a dependency on the oxygen concentration. Therefore, an additional temperature-independent resistive oxygen sensor structure was integrated on the same sensor platform. It serves not only to determine the oxygen concentration in the exhaust, but also to correct the oxygen dependency of the NOx sensor.
Nils Donker, Anastasiya Ruchets, Daniela Schönauer-Kamin, Jens Zosel, Ulrich Guth, and Ralf Moos
J. Sens. Sens. Syst., 9, 293–300, https://doi.org/10.5194/jsss-9-293-2020, https://doi.org/10.5194/jsss-9-293-2020, 2020
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Symmetrical Pt | YSZ | Pt–NO gas sensors were produced with frit-containing and fritless Pt electrodes and fired between 950 and 1300 °C. The sensors were operated by pulsed polarization. With fritless pastes, the sensors responded significantly higher. The firing temperature affects the sensitivity only slightly. The low NO sensitivity of the frit-containing electrodes was attributed to a blocking effect at the triple-phase boundaries that inhibits the oxygen transport through the sensor.
Stefanie Walter, Andreas Bogner, Gunter Hagen, and Ralf Moos
J. Sens. Sens. Syst., 8, 49–56, https://doi.org/10.5194/jsss-8-49-2019, https://doi.org/10.5194/jsss-8-49-2019, 2019
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A planar resonant radio-frequency gas sensor was equipped with an integrated heater. By simulative geometry optimization it now can be operated up to 700 °C. Sensitive materials with gas-dependent dielectric properties at higher temperatures can now be used. By coating the sensor with zeolite, ammonia could be detected. Depending on the working temperature, the sensor returns either a dosimeter signal (low temperatures) or a gas-concentration-dependent radio-frequency signal (high temperatures).
Murat Bektas, Thomas Stöcker, Angelika Mergner, Gunter Hagen, and Ralf Moos
J. Sens. Sens. Syst., 7, 289–297, https://doi.org/10.5194/jsss-7-289-2018, https://doi.org/10.5194/jsss-7-289-2018, 2018
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We prepared BaFe(1-x)-0.01Al0.01TaxO3-δ (BFATx) thick films with x between 0.1 and 0.4 at room temperature using the aerosol deposition method and we measured Seebeck coefficients and conductivities between 600 and 800 °C at different oxygen concentrations. Deposited on a transducer that includes a heater, equipotential layers, and electrode structures, a dual thermoelectric–resistive oxygen sensor with almost temperature-independent characteristics of both measurands was realized using BFAT30.
Gunter Hagen, Antonia Harsch, and Ralf Moos
J. Sens. Sens. Syst., 7, 79–84, https://doi.org/10.5194/jsss-7-79-2018, https://doi.org/10.5194/jsss-7-79-2018, 2018
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Monitoring hydrocarbon concentrations in automotive exhausts is affected by flow rate changes. The signal of thermoelectric gas sensors is a thermovoltage. Its origin is a temperature difference that depends on the flow rate. To avoid this noise effect, the sensor can be installed in a defined bypass position. As shown by simulation and experiments, the gas flow around the sensor is almost turbulence-free and the signal only depends on the hydrocarbon concentration and not on the flow rate.
Thomas Ritter, Sven Wiegärtner, Gunter Hagen, and Ralf Moos
J. Sens. Sens. Syst., 6, 395–405, https://doi.org/10.5194/jsss-6-395-2017, https://doi.org/10.5194/jsss-6-395-2017, 2017
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A planar thermoelectric gas sensor is modeled. By coupling all influences (fluid flow, gas diffusion, heat transfer, chemical reactions, and electrical properties) a model was set up that mirrors the sensor behavior precisely, as the comparison with experimental data shows. The coupling of 3-D and 1-D geometry enables to calculate the temperature distribution, fluid flow, and the gas concentration distribution in the 3-D model, while the chemical reactions are very accurately calculated in 1-D.
Franz Schubert, Michael Gollner, Jaroslaw Kita, Florian Linseis, and Ralf Moos
J. Sens. Sens. Syst., 5, 381–388, https://doi.org/10.5194/jsss-5-381-2016, https://doi.org/10.5194/jsss-5-381-2016, 2016
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An FEM model is used to improve the sensor design of a Tian–Calvet calorimeter. By modifying the basic part of the sensor (a sensor disc based on low temperature co-fired ceramics), the sensitivity was increased by a factor of 3. The model was validated and the sensors were calibrated. Indium and tin samples were measured. The melting temperatures show a deviation of 0.2 K while the enthalpy was measured with a precision better than 1 %. The values for tin deviate by less than 2 % from literature.
Franz Schubert, Michael Gollner, Jaroslaw Kita, Florian Linseis, and Ralf Moos
J. Sens. Sens. Syst., 5, 205–212, https://doi.org/10.5194/jsss-5-205-2016, https://doi.org/10.5194/jsss-5-205-2016, 2016
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Initial steps to apply a new ceramic multi-layer sensor for a Tian–Calvet calorimeter are shown. The FEM-developed sensor consists of stacked ceramic discs and insulation rings. The functionality of the sensor disc was proven up to 600 °C and the entire stack was tested at room temperature. The resolution was 5 µW and the sensitivity was 8.5 µV mW−1. The new sensor shows similar specifications as commercial devices and presents a good starting point for future high temperature applications.
F. Schubert, S. Wollenhaupt, J. Kita, G. Hagen, and R. Moos
J. Sens. Sens. Syst., 5, 25–32, https://doi.org/10.5194/jsss-5-25-2016, https://doi.org/10.5194/jsss-5-25-2016, 2016
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A manufacturing process for a planar binary lambda sensor is shown. By joining the heating and the sensing components via glass soldering with a joining temperature of 850 °C, a laboratory platform has been established that allows the manufacturing of two independent parts in HTCC technology with electrodes that are post-processed at lower temperatures, as is required for mixed-potential sensors. The concept has been proved by comparing the device with a commercial sensor.
S. Fischer, D. Schönauer-Kamin, R. Pohle, M. Fleischer, and R. Moos
J. Sens. Sens. Syst., 4, 321–329, https://doi.org/10.5194/jsss-4-321-2015, https://doi.org/10.5194/jsss-4-321-2015, 2015
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Thimble-type lambda probes that are known for their robustness in harsh exhausts can also be used as an NOx sensor by applying the pulsed polarization technique. This study evaluates in detail the influence of temperature on the NO sensitivity, so that an optimum operating point can be derived. Stepwise NO concentration changes between 0 and 12.5 ppm in synthetic exhausts demonstrate the high potential of this concept.
M. Dietrich, D. Rauch, U. Simon, A. Porch, and R. Moos
J. Sens. Sens. Syst., 4, 263–269, https://doi.org/10.5194/jsss-4-263-2015, https://doi.org/10.5194/jsss-4-263-2015, 2015
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The effect of stored ammonia on the complex dielectric permittivity of H-ZSM-5 zeolites with varying storage site density was observed between 200 and 300 °C under reaction conditions by microwave cavity perturbation. Polarization and dielectric losses were differently affected. The sensitivity of the polarization to stored ammonia is almost independent, the sensitivity of the dielectric losses strongly dependent on the storage site density. The results can be explained by proton hopping.
P. Fremerey, A. Jess, and R. Moos
J. Sens. Sens. Syst., 4, 143–149, https://doi.org/10.5194/jsss-4-143-2015, https://doi.org/10.5194/jsss-4-143-2015, 2015
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A concept to measure in situ sulfidation of silica pellet catalysts loaded with nickel is evaluated. During sulfidation between 100 and 400°C nickel sulfides form. The electrical impedance of the pellets was recorded in situ. At first, the particles are highly insulating but during sulfidation their conductivity increases by decades. Since nickel sulfides are less conductive than nickel, the strong conductivity increase may be due to conducting percolation paths that form during sulfidation.
M. Bektas, D. Hanft, D. Schönauer-Kamin, T. Stöcker, G. Hagen, and R. Moos
J. Sens. Sens. Syst., 3, 223–229, https://doi.org/10.5194/jsss-3-223-2014, https://doi.org/10.5194/jsss-3-223-2014, 2014
I. Marr, A. Groß, and R. Moos
J. Sens. Sens. Syst., 3, 29–46, https://doi.org/10.5194/jsss-3-29-2014, https://doi.org/10.5194/jsss-3-29-2014, 2014
P. Bartscherer and R. Moos
J. Sens. Sens. Syst., 2, 95–102, https://doi.org/10.5194/jsss-2-95-2013, https://doi.org/10.5194/jsss-2-95-2013, 2013
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Sensor technologies: Characterization and testing
Gauge to simultaneously determine the electrical conductivity, the Hall constant, and the Seebeck coefficient up to 800 °C
Precise characterization of VCSEL in the 1550 nm band having a wavelength tuning range of 12 nm within 10 µs as light sources for fast sensor systems
An algorithmic method for the identification of wood species and the classification of post-consumer wood using fluorescence lifetime imaging microscopy
High-temperature behavior of housed piezoelectric resonators based on CTGS
Investigation of a metrological atomic force microscope system with a combined cantilever position, bending and torsion detection system
Novel, low-cost device to simultaneously measure the electrical conductivity and the Hall coefficient from room temperature up to 600 °C
Random gas mixtures for efficient gas sensor calibration
Characterization of ceramics based on laser speckle photometry
Optimization of soot deposition by high-temperature prepolarization of a resistive particulate matter sensor
Comparison of different fiber coatings for distributed strain measurement in cementitious matrices
Measurement of the Beruforge 152DL thin-film lubricant using a developed thin-film thickness standard
Analysis and optimization of a cone flowmeter performance by means of a numerical and experimental approach
Dynamic characterization of multi-component sensors for force and moment
Field evaluation of a low-cost indoor air quality monitor to quantify exposure to pollutants in residential environments
In situ high-temperature gas sensors: continuous monitoring of the combustion quality of different wood combustion systems and optimization of combustion process
Transferable micromachined piezoresistive force sensor with integrated double-meander-spring system
Oxygen transport in epitaxial SrTiO3/SrTi1 − xFexO3 multilayer stacks
Fibre optic sensing system for monitoring of current collectors and overhead contact lines of railways
Optimization of a sensor for a Tian–Calvet calorimeter with LTCC-based sensor discs
Characterisation of the polarisation state of embedded piezoelectric transducers by thermal waves and thermal pulses
Investigation of dielectric properties of multilayer structures consisting of homogeneous plastics and liquid solutions at 75–110 GHz
A systematic MEMS sensor calibration framework
Monitoring human serum albumin cell cultures using surface plasmon resonance (SPR) spectroscopy
Alternative strategy for manufacturing of all-solid-state reference electrodes for potentiometry
Carbon monoxide gas sensing properties of Ga-doped ZnO film grown by ion plating with DC arc discharge
Humidity measurement with capacitive humidity sensors between −70°C and 25°C in low vacuum
Fabrication and characterization of a piezoresistive humidity sensor with a stress-free package
Validation and application of a cryogenic vacuum extraction system for soil and plant water extraction for isotope analysis
Robin Werner, Jaroslaw Kita, Michael Gollner, Florian Linseis, and Ralf Moos
J. Sens. Sens. Syst., 12, 69–84, https://doi.org/10.5194/jsss-12-69-2023, https://doi.org/10.5194/jsss-12-69-2023, 2023
Short summary
Short summary
A high-temperature gauge to simultaneously determine electrical conductivity, the Hall constant, and the Seebeck coefficient was developed. Screen-printed heating structures on a ceramic sample holder generate temperatures up to 800 °C. Heating structures were designed using FEM simulations. The temperature distribution was validated by thermal imaging. Measurements on constantan (reference material) and boron-doped silicon wafer confirm the functionality of the gauge up to 800 °C.
Roman Kruglov, Gregor Saur, and Rainer Engelbrecht
J. Sens. Sens. Syst., 11, 161–169, https://doi.org/10.5194/jsss-11-161-2022, https://doi.org/10.5194/jsss-11-161-2022, 2022
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Gas analysis by absorption spectroscopy helps to optimize combustion processes in engines. Optical distance sensors are non-contact and offer high accuracy and precision. Both sensor applications benefit from light sources with a rapidly swept wavelength to monitor dynamic processes. In our paper, we precisely characterize the dynamic wavelength sweep of a rapidly pulsed VCSEL (vertical cavity surface emitting laser), a tiny semiconductor laser well suited for optical sensing.
Nina Leiter, Maximilian Wohlschläger, Martin Versen, and Christian Laforsch
J. Sens. Sens. Syst., 11, 129–136, https://doi.org/10.5194/jsss-11-129-2022, https://doi.org/10.5194/jsss-11-129-2022, 2022
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In this contribution the frequency domain fluorescence lifetime imaging microscopy (FD-FLIM) technique is evaluated for post-consumer wood sorting. The measured data were processed using algorithmic decision trees to identify the wood species and post-consumer wood category. The experimental results revealed the high potential of the FD-FLIM technique for automated post-consumer wood sorting.
Michal Schulz, Rezvan Ghanavati, Fabian Kohler, Jürgen Wilde, and Holger Fritze
J. Sens. Sens. Syst., 10, 271–279, https://doi.org/10.5194/jsss-10-271-2021, https://doi.org/10.5194/jsss-10-271-2021, 2021
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Temperature sensors based on piezoelectric devices enable precise measurement of temperature changes in harsh environments such as high temperatures or aggressive atmospheres. In the case of this device, the change in the temperature is detected by means of the changing resonance frequency of the sensor. Here a sensor device based on catangasite (an isomorph of quartz) is presented. We discuss its behavior at elevated temperatures and confirm that it can successfully operate up to 1030 °C.
Yiting Wu, Elisa Wirthmann, Ute Klöpzig, and Tino Hausotte
J. Sens. Sens. Syst., 10, 171–177, https://doi.org/10.5194/jsss-10-171-2021, https://doi.org/10.5194/jsss-10-171-2021, 2021
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A new metrological atomic force microscope (MAFM) head design is shown. We investigated the MAFM head in the nanomeasuring machine (NMM-1) for different high-precision and large-scale traceable measurement tasks. Due to their integration, the MAFM head can benefit from the large measuring range, high-precision and traceability of the NMM-1 for efficient measurements on different samples. The presented results show the realised macroscale measurements with sub-nanometre resolution.
Robin Werner, Jaroslaw Kita, Michael Gollner, Florian Linseis, and Ralf Moos
J. Sens. Sens. Syst., 10, 71–81, https://doi.org/10.5194/jsss-10-71-2021, https://doi.org/10.5194/jsss-10-71-2021, 2021
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A novel, low-cost measurement device for simultaneous high temperature measurements of the electrical conductivity and Hall coefficient has been developed. Simulations were used to design a suitable screen-printed planar platinum heating structure that generates temperatures of up to 600 °C. Simulations of the temperature distribution have been validated using thermal imaging. Measurements were compared with data from the literature to validate the functionality of the novel device.
Tobias Baur, Manuel Bastuck, Caroline Schultealbert, Tilman Sauerwald, and Andreas Schütze
J. Sens. Sens. Syst., 9, 411–424, https://doi.org/10.5194/jsss-9-411-2020, https://doi.org/10.5194/jsss-9-411-2020, 2020
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Applications like air quality, fire detection and detection of explosives require selective and quantitative measurements in an ever-changing background of interfering gases. One main issue hindering the successful implementation of gas sensors in real-world applications is the lack of appropriate calibration procedures for advanced gas sensor systems. This article presents a calibration scheme for gas sensors based on gas profiles with unique randomized gas mixtures.
Lili Chen, Ulana Cikalova, Beatrice Bendjus, Stefan Muench, and Mike Roellig
J. Sens. Sens. Syst., 9, 345–354, https://doi.org/10.5194/jsss-9-345-2020, https://doi.org/10.5194/jsss-9-345-2020, 2020
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This paper describes an optical sensor system based on the technique of laser speckle photometry (LSP) for the application of stress characterization and defect detection in ceramics. The purpose of the research is to develop an in-line inspection solution for the industrial field. The preliminary results show that the LSP technique has the potential to fulfill the task.
Jens Ebel, Carolin Schilling, and Holger Fritze
J. Sens. Sens. Syst., 9, 263–271, https://doi.org/10.5194/jsss-9-263-2020, https://doi.org/10.5194/jsss-9-263-2020, 2020
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In a very specific way, this research paper shows how established systems – in this case a commercial soot sensor for the automotive sector – can be optimized by diving deep into the basic research. The approach here is to link macroscopic observations or signal behavior with processes taking place on the atomic level. Taking these fundamental processes into account, the sensor's specific response time could be shortened effectively by a change in operating strategy – without any design changes.
Martin Weisbrich, Klaus Holschemacher, and Thomas Bier
J. Sens. Sens. Syst., 9, 189–197, https://doi.org/10.5194/jsss-9-189-2020, https://doi.org/10.5194/jsss-9-189-2020, 2020
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Distributed fiber optic strain measurement based on Rayleigh scattering enables the monitoring of strain along the entire fiber length and the possibility of integration into material matrices. In this article, optical fibers were integrated into the concrete matrix of small prisms to measure the deformation by drying. In comparison with a reference measuring method, the losses of strain transfer were measured. The analysis shows a high correlation between the reference method and the fiber.
Sebastian Metzner, Tamara Reuter, and Tino Hausotte
J. Sens. Sens. Syst., 9, 157–165, https://doi.org/10.5194/jsss-9-157-2020, https://doi.org/10.5194/jsss-9-157-2020, 2020
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For the determination of the refractive index of the lubricant used in the sheet-bulk metal forming process, a lubricant thin-film thickness standard was developed which represents a continuous measuring range from 6 to 100 μm. To determine the refractive index, the thin-film thickness standard was measured with a coaxial interferometric measurement system in various thickness ranges. The results show changing optical properties with increasing layer thickness.
Giuseppe Dinardo, Laura Fabbiano, and Gaetano Vacca
J. Sens. Sens. Syst., 8, 269–283, https://doi.org/10.5194/jsss-8-269-2019, https://doi.org/10.5194/jsss-8-269-2019, 2019
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The paper deals with the proposal of a new obstruction flowmeter (cone type) characterized by an improved geometry. Compared with a standard geometry cone flowmeter, the proposed one ensures better performance in terms of a higher discharge coefficient and less permanent pressure drops. Additionally, several experimental tests and numerical simulations have been performed to compare the overall performance granted by both flowmeters, endorsing the superiority of the proposed solution.
Jan Nitsche, Rolf Kumme, and Rainer Tutsch
J. Sens. Sens. Syst., 7, 577–586, https://doi.org/10.5194/jsss-7-577-2018, https://doi.org/10.5194/jsss-7-577-2018, 2018
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Multi-component sensors for force and moment are commonly used in different areas as robotics, crash tests or material testing. The dynamic behaviour of such sensors may differ significantly from the static behaviour. To analyse the dynamic characteristics, we developed an improved test set-up for periodic excitation. It consists of an electrodynamic shaker, adapting elements and different acceleration references. The first experiments show good results for periodic excitation up to 1000 Hz.
Alejandro Moreno-Rangel, Tim Sharpe, Filbert Musau, and Gráinne McGill
J. Sens. Sens. Syst., 7, 373–388, https://doi.org/10.5194/jsss-7-373-2018, https://doi.org/10.5194/jsss-7-373-2018, 2018
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We compared the temperature, relative humidity, total volatile organic compounds, carbon dioxide equivalents, and fine particulate matter measurements from Foobot to highly accurate instruments. The results suggest that Foobot offers a relatively low-cost and straightforward solution for identifying high pollutant exposures with potential health risks and for providing data at high granularity. Foobot characteristics make it a useful tool to evaluate occupant pollutant exposure.
Heinz Kohler, Binayak Ojha, Navas Illyaskutty, Ingo Hartmann, Christian Thiel, Konrad Eisinger, and Markus Dambacher
J. Sens. Sens. Syst., 7, 161–167, https://doi.org/10.5194/jsss-7-161-2018, https://doi.org/10.5194/jsss-7-161-2018, 2018
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Wood-log- and wood-chip-fuelled low-power combustion systems emit high amounts of uncombusted gaseous components like CO and particulate matter. Emissions can be effectively reduced by optimized combustion process control using high-temperature gas sensors. The sensing behaviour of gas sensors for continuous analysis of uncombusted components and their long-term stability have been studied. The sensor signals are used to improve the combustion process control and to monitor combustion quality.
Gerry Hamdana, Maik Bertke, Lutz Doering, Thomas Frank, Uwe Brand, Hutomo Suryo Wasisto, and Erwin Peiner
J. Sens. Sens. Syst., 6, 121–133, https://doi.org/10.5194/jsss-6-121-2017, https://doi.org/10.5194/jsss-6-121-2017, 2017
Michal Schulz, Timna Orland, Alexander Mehlmann, Avner Rothschild, and Holger Fritze
J. Sens. Sens. Syst., 6, 107–119, https://doi.org/10.5194/jsss-6-107-2017, https://doi.org/10.5194/jsss-6-107-2017, 2017
Kerstin Schröder, Manfred Rothhardt, Wolfgang Ecke, Uwe Richter, André Sonntag, and Hartmut Bartelt
J. Sens. Sens. Syst., 6, 77–85, https://doi.org/10.5194/jsss-6-77-2017, https://doi.org/10.5194/jsss-6-77-2017, 2017
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Fibre optic sensors are excellent tools for monitoring (with) high-voltage current collectors. They are easily integrated into the collector strip and specialized for detection of events like hits on the strip. The sensing system can be used in regular trains and make monitoring of the overhead contact line routine, which is done "along the way", helping not only to prevent accidents by small intruders, but also allowing the prediction of wear and is used to optimize service and repair cycles.
Franz Schubert, Michael Gollner, Jaroslaw Kita, Florian Linseis, and Ralf Moos
J. Sens. Sens. Syst., 5, 381–388, https://doi.org/10.5194/jsss-5-381-2016, https://doi.org/10.5194/jsss-5-381-2016, 2016
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An FEM model is used to improve the sensor design of a Tian–Calvet calorimeter. By modifying the basic part of the sensor (a sensor disc based on low temperature co-fired ceramics), the sensitivity was increased by a factor of 3. The model was validated and the sensors were calibrated. Indium and tin samples were measured. The melting temperatures show a deviation of 0.2 K while the enthalpy was measured with a precision better than 1 %. The values for tin deviate by less than 2 % from literature.
Agnes Eydam, Gunnar Suchaneck, and Gerald Gerlach
J. Sens. Sens. Syst., 5, 165–170, https://doi.org/10.5194/jsss-5-165-2016, https://doi.org/10.5194/jsss-5-165-2016, 2016
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Piezoelectric devices are characterized non-destructively to ensure their functionality. The material is heated by laser diodes. The resulting temperature changes lead to a pyroelectric current. Analytical and numerical finite element models describe the temperature distribution and the current in frequency and time domain. Modelling and experimental results are compared for piezoelectric plates and integrated sensors and actuators.
M. Klenner, T. Abels, C. Zech, A. Hülsmann, M. Schlechtweg, and O. Ambacher
J. Sens. Sens. Syst., 4, 125–131, https://doi.org/10.5194/jsss-4-125-2015, https://doi.org/10.5194/jsss-4-125-2015, 2015
A. Dickow and G. Feiertag
J. Sens. Sens. Syst., 4, 97–102, https://doi.org/10.5194/jsss-4-97-2015, https://doi.org/10.5194/jsss-4-97-2015, 2015
Short summary
Short summary
In this paper we present a systematic method to determine sets of close-to-optimal sensor calibration points for a polynomial approximation.For each set of calibration points a polynomial is used to fit the nonlinear sensor response to the calibration reference. The polynomial parameters are calculated using ordinary least square fit. In an experiment, barometric MEMS pressure sensors are calibrated using the proposed calibration method at several temperatures and pressures.
A. Henseleit, C. Pohl, Th. Bley, and E. Boschke
J. Sens. Sens. Syst., 4, 77–83, https://doi.org/10.5194/jsss-4-77-2015, https://doi.org/10.5194/jsss-4-77-2015, 2015
J. C. B. Fernandes and E. V. Heinke
J. Sens. Sens. Syst., 4, 53–61, https://doi.org/10.5194/jsss-4-53-2015, https://doi.org/10.5194/jsss-4-53-2015, 2015
Short summary
Short summary
All-solid-state reference electrodes were developed based on particles of graphite/silver/silver chloride synthesized by electroless deposition of metallic silver and silver chloride on graphite powder. These electrodes were not sensitive to abrasion, redox species, pH and high-pressure saturated steam, and were applied successfully in potentiometric cells to measure pH and potassium ions in a complex matrix by direct potentiometry and L-ascorbic acid by potentiometric titration.
S. Kishimoto, S. Akamatsu, H. Song, J. Nomoto, H. Makino, and T. Yamamoto
J. Sens. Sens. Syst., 3, 331–334, https://doi.org/10.5194/jsss-3-331-2014, https://doi.org/10.5194/jsss-3-331-2014, 2014
A. Lorek
J. Sens. Sens. Syst., 3, 177–185, https://doi.org/10.5194/jsss-3-177-2014, https://doi.org/10.5194/jsss-3-177-2014, 2014
T. Waber, M. Sax, W. Pahl, S. Stufler, A. Leidl, M. Günther, and G. Feiertag
J. Sens. Sens. Syst., 3, 167–175, https://doi.org/10.5194/jsss-3-167-2014, https://doi.org/10.5194/jsss-3-167-2014, 2014
N. Orlowski, H.-G. Frede, N. Brüggemann, and L. Breuer
J. Sens. Sens. Syst., 2, 179–193, https://doi.org/10.5194/jsss-2-179-2013, https://doi.org/10.5194/jsss-2-179-2013, 2013
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Short summary
Sensors for detecting various gases, such as nitrogen oxides, play a major role in times of climate change in protecting the environment from the possible toxic influences of such gases. Due to their usually complex design, gas sensors may react to changes in the operating temperature, which can occur due to different ambient influences. This article shows two methods for accurately measuring the temperature on the surface of a sensor under realistic conditions.
Sensors for detecting various gases, such as nitrogen oxides, play a major role in times of...
