Face temperature detection without thermal camera ( by cellphone for Covid19) [closed]

1. Do cell phones have thermal imaging?
2. Why do we check temperature with Covid?
3. Which radiation is used for measuring body temperature as per COVID-19?

Do cell phones have thermal imaging?

Most phones today don't come with a thermal camera, but several smartphone attachments let your device take thermal video and images. The FLIR ONE Gen 3 is one example that connects to any iOS device. You can even edit the pictures using the dedicated mobile app.

Why do we check temperature with Covid?

Background: Many persons with active SARS-CoV-2 infection experience mild or no symptoms, presenting barriers to COVID-19 prevention. Regular temperature screening is nonetheless used in some settings, including university campuses, to reduce transmission potential.

Which radiation is used for measuring body temperature as per COVID-19?

Telethermographic systems are devices when they are intended for a medical purpose, such as measurement of the self-emanating infrared radiation that reveals the relative temperature variations of the surface of the body.