An electrochemical hydrophone based on the principles of molecular electronic transfer (MET) is described. The paper presents theoretical and experimental results for the sensitivity and the level of self-noise determination for METH in the frequency range of 0.02–200 Hz, which determines the fields of acceptance of the devices being developed. An experimental model has been developed by using a force-balancing feedback. Different methods and techniques for its calibration have been developed.

We combine two modern trends in component fabrication, namely, the integration of sensors into machine parts and the 3-D-printing technology, which is rapidly emerging in the fabrication of standardized and customized components and prototypes. We present a 3-D-printed ‘smart’ screw with an integrated strain gauge. The signal of the sensor can be used to monitor the fastening process of the screw as well as the reduction in strength of the screw joint over time.

The presented work gives insight into the behaviour of co-resonantly coupled oscillating cantilever beams by means of electro-mechanical analogies. An electric circuit model is analysed with various stages of complexity, and conclusions are drawn regarding the applicability of the co-resonant concept for sensors. Furthermore, this is validated by a comparison between the theoretical predictions and experimental data.

The exploitation of new application fields and the drive to size reduction even in highly stable pressure sensing systems makes the extension of the operating temperature range of the microelectromechanical sensors (MEMS) essential. For this reason, a silicon-based pressure sensor with an application temperature ranging up to 300 °C and the associated manufacturing technology was developed. The evolved sensor has an excellent stability and is uncomplicated to mount due to its stress insensitivity.

We tested two types of home-made sensing elements – four coupled silicon micro-levers and a multilayer graphene membrane – which have the potential to further enhance the sensitivity of laser photoacoustic spectroscopy. Graphene sheets possess outstanding electromechanical properties and demonstrate impressive sensitivity as mass detectors. Their mechanical properties make them suitable for use as micro-/nano-levers or membranes, which could function as extremely sensitive pressure sensors.