In modern medical treatment, there

In modern medical treatment, there are generally measuring methods when testing human body temperature. One is contact detection, in which people usually use mercury thermometer, which has the advantage of high detection accuracy and close to human body temperature, but it needs close contact with human body and takes a certain time to measure temperature. In the face of large-scale detection, the timeliness is low, which requires huge manpower and material resources. The most important thing is that when many people use the same mercury thermometer, there is the risk of cross infection, which may lead to greater harm. The other is non-contact detection. One of the most commonly used methods in non-contact detection is infrared thermometer, which is convenient and fast, and can be used anytime and anywhere. It can quickly get the body temperature information of a large number of people in many places, and it does not directly contact with the tested people, which reduces the possibility of cross infection. However, there are also situations where the measurement accuracy is not high and the reliability is poor, and it is easily affected by the external environment. Nowadays, infrared thermometers have developed rapidly and are widely used in many fields, especially in the industrial and aerospace fields. However, due to its low precision and poor reliability, they are relatively late to be widely used in the medical field, because medical instruments have strict requirements on precision and reliability. It was not until the 1980s that infrared thermometers began to appear and be used in the medical field. After that, people continued to improve their acquisition methods and measurement accuracy, and they were gradually recognized by most people. At present, there are three kinds of infrared thermometers in the market. They are ear cavity type, forehead temperature type and infrared body temperature monitors, and different infrared body temperature monitors have their own characteristics.