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A comprehensive comparative analysis of two temperature measuring instruments: infrared thermography and forehead temperature gun
Release date: July 24, 2020 16:02

Since the outbreak of the epidemic, at the entrance of the community, the entrance of shopping malls, the entrance of the station, and even the entrance of the road, there are always armed staff with cool forehead temperature guns aiming at your forehead. The similar positions and eyes are like the scenes in the infernal road. Now, daily body temperature detection has become a necessary condition for enterprises to return to work. Feng Luzhao, a researcher at the Chinese Center for Disease Control and prevention, said that the two major tools for epidemic prevention are infrared thermography and forehead temperature gun Infrared thermal imaging thermometer It can realize multi-target temperature detection at the same time in a long distance and non-contact situation, which can reduce personnel contact and is relatively safe and convenient. However, its accuracy is affected by the external environment. It is recommended to use it according to the actual situation.

Forehead temperature gun and Infrared thermography The infrared radiation from human body surface is used to measure temperature. Temperature measurement sometimes deviates from the normal temperature. What's going on? The influencing factors are as follows: first, the body temperature fluctuates in the range of 36.3 ℃ ~ 37.2 ℃. The normal value is not a fixed value, but is not a fixed value A range. Fever is usually considered to be above 37.3 ℃. The body temperature fluctuates in this range due to the influence of weather, emotion, exercise and time. In order to keep the temperature stable, try to keep calm and avoid strenuous exercise.

Secondly, Infrared thermography It measures the body surface temperature, which is displayed as the body temperature through the conversion of body temperature and body surface temperature. We can see the temperature distribution in different parts of the human body. Different parts of the body surface temperature measured, the body surface temperature conversion model is also different, and the temperature displayed will be slightly different. Typical face temperature distribution

Third, different temperature measurement equipment will have different measurement accuracy. Even if two mercury thermometers are used, the error will be about 0.3 ℃. According to the national standard, the temperature measurement range is 33 ℃ ~ 42 ℃, Infrared thermography It is a good temperature measurement product to meet the temperature measurement accuracy of 0.3 ℃. Here, 0.3 ℃ refers to the accuracy of the laboratory environment test in which there is no wind, the indoor temperature is about 20 ℃ and the humidity is lower than 90%. The common factors affecting the temperature measurement accuracy of infrared products include environmental temperature, humidity, atmospheric attenuation, temperature measurement distance, conversion between body temperature and body surface temperature, air convection and so on. Therefore, infrared thermometer is generally recommended to be used in indoor environment.

Because the body surface temperature is greatly affected by the ambient temperature, the forehead temperature of the people who just enter from the outdoor is usually significantly lower than that of the indoor personnel. At this time, it needs to be stable for a period of time before the human body temperature is measured. In order to reduce the occurrence of this situation, the intersection of internal and external flow of people should be avoided as far as possible. In addition, if conditions permit, the screening equipment can be arranged at the end of the channel, so that the tested personnel have enough time to adapt to the indoor ambient temperature. What is the difference between infrared thermography and forehead temperature gun? Forehead temperature gun is a single target temperature measurement, infrared thermal imager can achieve multi-target, non sensing, real-time temperature measurement. Combine the high-end forehead temperature gun with Infrared thermography comparison. The high-end forehead temperature gun needs to stay for 2 seconds to complete the temperature measurement. In addition to the time for the staff to lift and put down the forehead temperature gun, about 15 people were measured in one person and one minute. A 384 × 288 thermal image thermometer has 16 people in each frame, and 400 people can be measured in one minute.

Infrared thermography Only one staff member is required to be on duty in front of the monitor to watch the real-time temperature of each passer-by on the monitor, and retest when an alarm is given. Under the same working conditions, the detection efficiency of infrared thermography is 26 times higher than that of forehead temperature gun. In the advanced process of temperature measurement speed (from left to right, the efficiency is higher and higher). Due to the high labor cost and the risk of close contact of personnel, the use of infrared thermometer in airports, stations, schools, hospitals, supermarkets, companies and other places can not only save money, but also achieve senseless temperature measurement without disturbing the passage of personnel. At the same time, infrared thermography has more advantages: Security: long-distance, non-contact; high efficiency: measuring multiple people at the same time, no need to cooperate and wait; data analysis: record storage, flow statistics, cloud sharing, and statistical data analysis. The detection efficiency and automation degree of infrared thermography temperature screening system has incomparable advantages compared with other temperature measurement schemes.

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