To quote part of the web page at our companion website, About Temperature Sensors, (on SARS Temperature Sensors from 2004).
Primarily, Infrared Thermal Imagers are used in screening people for elevated body temperature. While not the most precise method to measure human body temperature, infrared thermal imagers or scanners are good at determining if someone appears hotter or colder than another person, or the average for a group of people under the same viewing conditions.
By having a very stable and drift free measurement and system software that enables averaging, selecting the hottest spot in a viewed scene and then recording and alarming capability, a Thermal Imaging System is an excellent tool for screening large numbers of people such as passengers exiting an airplane.
See the table on the page for information about equipment and software from various vendors aimed specifically at uses in detecting people that may have SARS ( or Swine Flu or Bird Flu or Dengue).
One must be very careful in using infrared measurement devices because large errors are possible sometimes even under the best circumstances.
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