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Classification and principle of infrared thermometer for human body
Release date: July 15, 2020 17:33

Infrared thermometer for human body Because of its non-contact, high efficiency and easy to use, it is widely used in the traffic gateways, hospitals, residential areas, enterprises and institutions with dense flow of people during the epidemic period. Currently commonly used Infrared thermometer for human body There are two types of thermometers: infrared thermometers and infrared thermometers. Infrared thermal imaging temperature rapid screening instrument can be used for large area monitoring in public places with dense flow of people. It can automatically track and alarm high-temperature areas, and cooperate with visible light video to quickly find and track people with high body temperature. When the infrared thermal imaging temperature screening instrument integrates face recognition, mobile phone probe and other technologies, it can also master more information about people with higher body temperature. Infrared thermometer can be divided into infrared ear thermometer and infrared forehead thermometer. Infrared thermometer is simple in equipment, easy to use and affordable in price. It can realize the sequential and rapid temperature measurement of personnel.

Infrared thermometer for human body Principle of temperature measurement In nature, in addition to the light that can be seen by human eyes (usually called visible light), there are also ultraviolet, infrared and other non visible light. Any object whose temperature is higher than absolute zero (- 273 ℃) in nature radiates electromagnetic wave (infrared ray) at any time. Therefore, infrared ray is the most extensive electromagnetic wave in nature, and thermal infrared ray will not be absorbed by atmospheric smoke and cloud. With the rapid development of science and technology, the use of infrared characteristics, the use of electronic technology and computer software and infrared technology, used to detect and measure thermal radiation. According to the size of the external radiation heat on the surface of the object, the thermal sensor obtains different heat difference. Through the processing of electronic technology and software technology, the image with different light and shade or color difference is presented, which is commonly referred to as infrared thermal imaging. After the heat on the surface of the radiation source is converted by thermal radiation algorithm, the conversion between thermal image and temperature is realized.

The non-contact infrared thermometer is composed of optical system, photoelectric detector, signal amplifier, signal processing and display output. The optical system is to gather the infrared energy radiated by the target object, focus on the photodetector, and convert it into the corresponding electrical signal. After the circuit operation and processing circuit, it is converted into the linear temperature signal value of the measured target, so as to realize further signal processing and control. According to the infrared principle to distinguish the infrared temperature measurement method, brightness temperature measurement method is based on the measurement of a given wavelength K0 near a narrow spectral range of radiation, using blackbody calibration instrument to determine the temperature of the object, suitable for high temperature measurement. The maximum wavelength temperature measurement method is based on Wien's displacement law. The product of the peak wavelength of blackbody radiation kmax and the absolute temperature T is a constant. The temperature T is calculated by measuring the peak wavelength kmax. This method is usually used to measure extremely high temperature (more than 2000 ° C).

The infrared thermometer of human body can work normally only at a certain ambient temperature. Generally, when the temperature is lower than 16 ℃, the data will have a large deviation, even can not be displayed. From the measurement principle, it is a normal phenomenon. He suggested that the measurement should be carried out in a place with no strong convection, no strong radiation, no high humidity, relatively constant temperature and in accordance with the environmental temperature declared by the thermometer. Taking the infrared forehead thermometer as an example, the body surface temperature of the measured person should reach the thermal balance state with the measuring environment before starting the measurement. When measuring the body temperature, the infrared thermometer should be aimed at the center of forehead (above the eyebrow center and kept vertical), and the measuring position should not be covered by hair, sweat, hat, etc., and the measurement distance should be (1-3) cm. Repeat the measurement twice within 1 minute, and each measurement time should be maintained for (3-5) seconds. The difference between the two measurements is within 0.3 ℃. The data can be accepted. Otherwise, it is necessary to measure again after inspection.

Infrared thermometer for human body The advantage of not measuring body temperature for more than 2 seconds is not necessary. Therefore, it is very suitable for the application in the prevention and detection of fever diseases. Generally, the accuracy of the infrared thermography rapid temperature screening instrument can reach ± 0.3 ℃ and the infrared thermometer can reach ± 0.2 ℃ when the human body temperature is around 37 ℃. Infrared thermometers are the second most accurate. However, if the measurement method is not correct, the measurement results will be inaccurate.

Infrared thermometer for human body In areas with large flow of people, such as schools, shopping malls, banks, stock exchanges, cinemas, markets and other public places, the screening temperature measurement method is adopted to quickly realize the screening of fever personnel, and avoid the crowd and gathering caused by manual screening. In the entrance and exit area close to the pedestrian flow, a dual spectrum temperature measurement camera is set, and the lens is aimed at the access channel. The temperature measuring camera is set with an alarm threshold close to heating (for example: 3.3 ℃), When the flow of people reaches or exceeds this threshold value, the back-end platform alarms to remind the staff, and can carry out the second temperature measurement for the suspected fever personnel, which can not only quickly screen, but also avoid the risk of cross infection caused by one-to-one close contact temperature measurement.

 

 

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