Evaluation of the Size-of-Source Effect in Thermal Imaging Cameras

In numerous applications, including current body temperature monitoring in viral pandemic management, thermal imaging cameras are used for quantitative measurements. These require determination of the measurement accuracy (error) and its traceability (measurement uncertainty). Within error estimation, the size-of-source effect (SSE) is an important error source. The SSE is the relation between the physical size of a target and the instrument's nominal target size. This study presents a direct evaluation of the error due to the SSE. A stable and uniform temperature, generated by blackbodies, was measured by a high-quality thermal imager. To limit the generated radiation, custom-made blocking tiles with different apertures were used. Effects of aperture shapes and positions, camera-target distances and temperature levels on the error were investigated. The study findings suggest that due to the SSE the measured temperatures are too low, especially at longer camera-target distances. The SSE error depends on the number of pixels available and included into the region of interest, for which the accurate measurement is about to be performed. For an accurate temperature measurement, an array of at least 10 x 10 pixels should be exposed to the observed target radiation, while 3 x 3 central pixel area should be included in the temperature calculation.

Automated summary

In various applications, thermal imaging cameras are used for quantitative measurements, such as current body temperature monitoring during viral pandemic management. One important error source in such measurements is the size-of-source effect (SSE), which relates the physical size of a target to the instrument's nominal target size. This study evaluates the error due to SSE in temperature measurements using a high-quality thermal imager and custom-made blocking tiles with different apertures. The findings suggest that the measured temperatures are too low, especially at longer camera-target distances, and an array of at least 10 x 10 pixels with 3 x 3 central pixels is needed for accurate temperature measurement.