Abstract
The optical design of a compact off-axis four-mirror objective system (OFOS) of a thermal camera for a syndromic surveillance system that captures bioclinical signals, like temperature, directly related to the physical symptoms of the COVID-19 disease through thermal images is presented. The OFOS design works on wavelengths of 7.5–14 µm, with an $f$-number of 4, and a field of view (FOV) of ${{24}} \times {{4}}$ deg.
© 2021 Optical Society of America
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