Articles | Volume 15, issue 2
https://doi.org/10.5194/jsss-15-155-2026
https://doi.org/10.5194/jsss-15-155-2026
Regular research article
 | 
06 Aug 2026
Regular research article |  | 06 Aug 2026

High-resolution characterization of the size-of-source effect via a continuously variable aperture

Miguel-David Mendez-Bohorquez, Robert Schmoll, and Andreas Kroll

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Cited articles

AlDawood, N. D., AlSbaiy, E. S., AlQahtani, N. M., and Ahmed, K. M.: Exploring the size-of-source effect of transfer radiation thermometers by various methods, in: Proceedings of the 2023 14th International Conference on Measurement, IEEE, Smolenice, Slovakia, 273–276, https://doi.org/10.23919/MEASUREMENT59122.2023.101644 59, 2023. a
Bart, M., Van Der Ham, E. W. M., and Saunders, P.: A new method to determine the size-of-source effect, Int. J. Thermophys., 28, 2111–2117, https://doi.org/10.1007/s10765-007-0251-6, 2007. a
Bloembergen, P.: On the uncertainty in the correction for the size-of-source effect, Metrologia, 46, 544–553, https://doi.org/10.1088/0026-1394/46/5/019, 2009a. a, b
Bloembergen, P.: Analytical representations of the size-of-source effect, Metrologia, 46, 534–543, https://doi.org/10.1088/0026-1394/46/5/018, 2009b. a, b, c
Bradski, G.: The OpenCV Library, Dr. Dobb's Journal of Software Tools, https://github.com/opencv/opencv (last access: 14 July 2026), 2000. a
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Short summary
The size-of-source effect (SSE) is a systematic error requiring slow labor-intensive measurements. We propose a continuous approach using an iris diaphragm. Our method matched the accuracy of the traditional discrete method while providing more data and a reduction in measurement time. The method has no significant sensitivity to frame rate changes. Transient responses were observed using a neutral density filter, raising questions on how to measure and correct SSE in such configurations.
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