In modern medicine, there are usual

In modern medicine, there are usually measuring methods when testing human body temperature. One is contact detection, people usually use mercury thermometer, which has the advantages 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, timeliness is low, which requires a lot of manpower and material resources. Most importantly, when many people use the same mercury thermometer, there is a risk of cross infection, which may lead to greater harm. The other is non-contact detection. Infrared thermometer is one of the most commonly used methods in non-contact detection, which is convenient and fast, and can be used anytime and anywhere. It can quickly obtain a large number of people's body temperature information in many places, and has no direct contact with subjects, thus reducing the possibility of cross-infection. However, in some cases, 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 industry and aerospace. However, medical devices have strict requirements on accuracy and reliability, so they have low accuracy and poor reliability, so they are applied later in the medical field. It was not until 1980s that infrared thermometers began to appear and be used in medical field. Since then, people have continued to improve their collection methods and measurement accuracy, and have gradually been recognized by most people. At present, there are three kinds of infrared thermometers on 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.