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An f‑number (ƒ/#) or f‑stop refers to the ratio of a lens’s focal length to its aperture’s diameter (lens opening vs focal length) and indicates the amount of IR energy (heat) coming through the lens to the infrared sensor. The lower the f-number the larger the aperture diameter, meaning more thermal IR energy is reaching the infrared sensor.
F-stop vs aperture: what's the difference? - Quora
Infrared Thermal Imaging - Basic Knowledge - Heimann
Would thermal imaging detect a person in 90-100 degree weather
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TC002 Thermal Camera for iOS (with Type-C Cable, Suitable for iPhone 15), 256 x 192 IR High Resolution, Thermal Imager, Thermal Imaging Camera
What is F-Stop, How it Works and How to Use it in Photography
F-number matched (left) and unmatched (right) optical systems
I tested the world's first thermal phone camera with a 50Hz
Would thermal imaging detect a person in 90-100 degree weather
Aperture, Shutter Speed, ISO