Infrared Human Body Thermometer Principle and Advantages
The infrared human body thermometer consists of an optical electronic system, a photodetector, a signal enhancer, signal analysis, and display information output. The optical electronic system gathers the overall infrared radiation kinetic energy of the target in its field of view, and the infrared kinetic energy is focused on the photodetector and changes into a relative electronic signal. This data signal is then calculated to change into the temperature value of the measured overall target.
The light waves emitted by the sun are also called electromagnetic waves. Visible light is an electromagnetic wave that the human eye can sense. After being refracted by a prism, it can see seven colors of light: red, orange, yellow, green, blue, and purple.
Infrared is a part of these electromagnetic waves, which, together with visible light, ultraviolet radiation, X-rays, gamma rays, and radio waves, form a complete and continuous electromagnetic spectrum. As shown in the above figure, electromagnetic radiation with a wavelength range of 0.76 μ m to 1000 μ m is called infrared radiation. Any object with a temperature above absolute zero (-273.15 ° C) continuously emits infrared radiation (thermal radiation). Invisible to the human eye, and the wavelength of external radiation varies at different temperatures. For the human body, the temperature inside the body is relatively constant. Thermal imaging measures temperature by detecting the thermal radiation on the surface of a human body. Based on the big data of human body temperature measurement, it maps to the internal temperature of the human body through temperature measurement algorithms.
The advantages of infrared human body thermometer
1. Non contact measurement: The Time Ruizi infrared thermometer does not need to come into contact with the interior or surface of the measured temperature field, so it will not interfere with the state of the measured temperature field, and the thermometer itself is not damaged by the temperature field.
2. Wide measurement range: Due to its non-contact temperature measurement, the thermometer is not in a higher or lower temperature field, but operates under normal temperature or conditions allowed by the thermometer. In general, it can be measured from negative tens of degrees to over 3000 degrees.
3. Fast temperature measurement speed: that is, fast response time. As long as the infrared radiation of the target is received, the temperature can be fixed in a short period of time.
4. High accuracy: Infrared temperature measurement will not damage the temperature distribution of the object itself like contact temperature measurement, so the measurement accuracy is high.
5. High sensitivity: As long as there is a slight change in the temperature of the object, there will be a significant change in the radiation energy, making it easy to measure. It can be used for temperature measurement and temperature distribution measurement of small temperature fields, as well as temperature measurement of moving or rotating objects. Safe to use and long service life.
