Principle of Thermal Imaging Temperature Measurement

Principle of Thermal Imaging Temperature Measurement 2

Q1. What is the difference between FOLAIDA Smart Body Temperature Display /Kiosk and the other facial recognition thermometer equipment?

The thermal imaging principle of the thermal imager is consistent. The difference lies in the IR thermal sensor range and temperature measurement algorithm.

IR thermal IR thermal sensor range: Many manufacturers use industrial IR thermal sensors, which can demonstrate the measurement of hot water temperature of 50 ° C or even 60 ° C. As the range of industrial IR thermal sensors is generally from -20 ℃ to 150 ℃, the larger sensor range means the higher the error.

FOLAIDA Smart Body Temperature Display/Kiosk, use customized IR thermal sensor, the range is customized from 35 ℃, to 42℃. Optimized by algorithm to ambient temperature 20 ~ 30 ℃, distance 30 ~ 50cm, 2 seconds measurement time (no need of blackbody), accuracy ± 0.3 ℃

Temperature measurement algorithm: the temperature measurement module comes from Huawei, and IR thermal sensors from Melexis/Seiko/Omron. Abnormal temperature above 37.3 ℃ can be accurately tested at ambient temperature 15 ℃ ~ 35 ℃.

And many other suppliers use the temperature measurement method of manually adjusting the relative temperature value of the IR thermal sensor according to the value obtained from the forehead temperature gun (each person’s temperature is different). The ambient temperature needs to be calibrated once, and the individual temperature is different. There is also uncertainty in body temperature. It is equivalent to a laboratory product, a non-commercial product, will miss low fever personnel, and lose the original intention of temperature screening

FOLAIDA Smart Body Temperature Display/Kiosk is factory-corrected with high-precision blackbody calibration, without the need for manual correction through the forehead gun and ear thermometer, to ensure accurate and effective body temperature data.

Q2: What is the principle of thermal imaging of human body temperature measurement, and what are the influencing factors?

Any object with a temperature above absolute zero (-273.15 ° C) is constantly emitting infrared radiation (thermal radiation). Infrared radiation is an electromagnetic wave with a wavelength range of 0.7um-1000um, which is invisible to the human eye and different wavelengths of external radiation at different temperatures. After absorbing infrared radiation, the temperature of the heat sensitive material will increase, and the thermal imaging camera will then calculate the corresponding temperature information according to the corresponding temperature saving situation. For the human body, the body temperature is relatively constant (like: anal temperature: 36.6 ° C to 38 ° C; oral temperature: 35.8 ° C to 38 ° C, forehead temperature: 35.8 ° C to 37.8 ° C, face temperature: 32 ° C to 36 ° C). Thermal imaging measures temperature by detecting thermal radiation on the human surface. Based on human body temperature measurement big data, it is mapped to human body temperature through a temperature measurement algorithm.

Q3: Is blackbody needed for Infrared thermal imaging temperature measurement?

  1. Blackbody mode. Blackbody is a calibration device. You can set the temperature value. It is a standard temperature source. The thermal imaging device calibrates based on the temperature of the blackbody. The thermal imager is calibrated in real time with the black body (the black body is arranged on the opposite side of the thermal imager to ensure that the front side of the blackbody appears on the thermal imager screen) to ensure that the temperature measurement accuracy is at a high level (± 0.3 ° C accuracy). The bold body only needs to be powered, and no networking requirement.
  2. Human body temperature mode, replacing blackbody real-time calibration is the temperature measurement algorithm of the temperature measurement company. The temperature measurement algorithm needs to measure a large amount of raw data of the surface temperature detected by the thermal imager and the actual temperature of the human body in different ambient temperatures, and then based on the principle of human body temperature In-depth learning results in a temperature offset table, which is the core of every temperature measurement company.

Q4: Can we install FOLAIDA Smart Body Temperature Display/Kiosk for outdoors?

The optimal installation environment is indoors (or a relatively isolated area from the outdoor), and the ambient temperature is 15 ~ 30 ℃. Because sunlight, wind, cold air, and air conditioning will affect the body surface temperature and the measurement result, would be different with the real body temperature.

Of course, if you do not have a suitable indoor environment, need to use FOLAIDA smart body temperature display/kiosk at the indoor and outdoor direct-through area, or outdoor door place. We would suggest you could build a temporary temperature measurement channel there to create a more stable temperature measurement environment.

Q5. What are the influencing factors of temperature measurement?

Wind, which causes heat dissipation, would take away the heat of forehead, and affect the accuracy of temperature measurement.

Sweating, which would bring the human body to cool down automatically. Therefore, when we sweat, our body temperature also decreases.

Ambient temperature, if the room temperature is too low, will directly take away our body heat. Temperatures below 15 degrees are not suitable for body temperature measure; because the temperature of our forehead will become lower due to low room temperature. Similarly, if the temperature is too high, we would sweat and the forehead temperature will also decrease; these will cause inaccurate temperature test results.

For the thermal imager is sensitive to light waves with a wavelength of 10 ~ 15 um, we should avoid using this temperature measurement method in the environment of the sun, fluorescent light sources, air conditioning vents, heating, cold vents, glass surfaces, etc.