The principle and advantages of infrared human thermometer
The infrared human body thermometer consists of an optical electronic system, a photodetector, a signal amplifier, signal analysis, and display information output. The optical electronic system gathers the infrared radiation kinetic energy of the overall target within its field of view. The infrared kinetic energy is focused on the photodetector and changes into a relative electronic signal, which 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 can be perceived by the human eye. After being refracted by a prism, it can see seven colors of light: red, orange, yellow, green, cyan, blue, and purple.
Infrared radiation 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). The human eye cannot see it, and the wavelength of external radiation varies at different temperatures. For the human body, the internal temperature is relatively constant. Thermal imaging measures temperature by detecting thermal radiation on the surface of a person, and based on human body temperature measurement big data, maps it to the internal temperature of the human body through temperature measurement algorithms.
The advantages of infrared human thermometer
1. Non contact measurement: The Era 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: As it is a non-contact temperature measurement, the thermometer is not located in a high or low temperature field, but works under normal temperature or conditions allowed by the thermometer. In general, it can measure negative tens of degrees to over 3000 degrees.
3. Fast temperature measurement speed: i.e. fast response time. As long as the infrared radiation of the target is received, the temperature can be set in a short period of time.
4. High accuracy: Infrared temperature measurement does 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 small change in the temperature of an object, the radiation energy will change significantly, making it easy to measure. It can perform 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.
