• Thermal Imaging System for Human Fever Screening

Thermal Imaging System for Human Fever Screening

Easy to setup and operate
0.05°C sensitivity; 0.3°C accuracy
Integrated visual camera
All-inclusive turnkey system
Mobile platform
No external calibration source required
Model : Opto-Thermoscreen

Optotherm's patent-pending technology provides the most accurate method of mass screening for elevated facial skin temperatures that may indicate a fever. Because it is both fast and noninvasive, Thermoscreen is the best way to safeguard areas with high pedestrian flow.

Thermoscreen was originally developed in response to the need to screen large numbers of individuals for potential fever during the SARS outbreak in 2003. Thermoscreen scans subjects without contact from a distance, providing a discreet and safe method of detecting potentially feverish individuals. Over 1,000 individuals can be screened per hour so as not to restrict pedestrian flow. Thermoscreen is sold as a complete, fully tested system including a computer with preinstalled hardware and software.

For general camera specifications please see Infrasight IS640 camera specifications.

Note: Thermoscreen cameras undergo a rigorous calibration process specifically designed to maximize accuracy for human fever screening measurements. Calibration temperature range and sensitivity are optimized to provide the highest sensitivity and precision when measuring the temperature of human skin. For this reason, the following temperature measurement specifications supercede the general camera specifications.

IS640 with Macroscopic Lens


Field of View
Screening Area
Screening Distance
Working Distance
Focal Length
Working F/#
48 x 38°
181 x 136 cm
2 meters
100 mm to infinity
12 mm


Calibration Range
Sensitivity (NETD) *

0 to 80°C
Low range: < 50 mK
+/-0.3°C between 30 to 40°C;
+/-1°C otherwise

* Noise Equivalent Temperature Difference (NETD) specifies the smallest temperature difference that can be detected.

Camera Enclosure and Mobile Stand Specifications

Camera Enclosure Dimensions

Camera Enclosure Weight
Mobile Stand Weight
Mobile Stand Dimensions
5 kg
13 kg
185 x 70 cm base
During the past decade, infrared thermometry has seen remarkable success in measuring human body temperature, as evidenced by the many variations of the infrared ear thermometer. Ear thermometers measure temperature by detecting the amount of energy emitted in the infrared region of the electromagnetic spectrum. All objects having a temperature higher than absolute zero (-273°C) emit infrared energy. In fact, as shown below, the majority of body heat loss in a room temperature environment is by emitted infrared energy.

Infrared Cameras

Thermal imaging cameras, like those manufactured by Optotherm, operate in a similar manner to ear thermometers. However, whereas ear thermometers can only measure the temperature at a single spot, thermal imagers can measure the temperature at tens of thousands of spots that together create a thermal image, as shown below. Like ear thermometers, thermal imagers are passive devices and emit no harmful radiation.

There are two primary detector technologies used in thermal imaging cameras for human fever screening; medium and long wave. Medium wave infrared detectors are sensitive to electromagnetic energy that is 3 to 5 microns (0.003 to 0.005 mm) in wavelength. Long wave infrared detectors are sensitive to electromagnetic energy that is 7 to 15 microns in wavelength. As shown in the graph above, there is a peak wavelength of emitted energy for each specific temperature and the peak wavelength increases at lower temperatures. The peak of emitted energy for objects at human body temperatures is approximately 9.5 microns in wavelength. For this reason, Thermoscreen was developed using long wave detector technology to take advantage of the increased sensitivity these detectors provide when measuring the temperature of human bodies.


Protect both patients and visitors.


Screen arriving and departing passengers.


Safeguard the health of patrons and employees.

Educational Institutions

Help provide a safe environment for students and faculty.