Introduction and fundamental information on using a human infrared thermometer
In the production process, infrared temperature measurement technology plays an important role in product quality control and monitoring, equipment online fault diagnosis and safety protection, and energy saving. In the past 20 years, the non-contact infrared human body thermometer has developed rapidly in technology, its performance has been continuously improved, its functions have been continuously enhanced, its varieties have continued to increase, and its scope of application has also continued to expand. Compared with contact temperature measurement methods, infrared temperature measurement has the advantages of fast response time, non-contact, safe use and long service life. Non-contact infrared thermometers include three series of portable, on-line and scanning, and are equipped with various options and computer software, and each series has various models and specifications. Among the various models of thermometers with different specifications, it is very important for users to choose the correct model of infrared thermometer.
Infrared thermometers used to test the temperature of the human body are called human infrared thermometers. But it must be clarified that there is no special medical or industrial infrared thermometer, because the manufacturing principles of infrared thermometers are the same. There are only high-precision, high distance coefficient ratio, high-performance infrared thermometers and low-precision, low distance coefficient ratio and low-performance infrared thermometers. As long as the emissivity of the infrared thermometer is set at 0.95 (the emissivity of human skin is generally this value, even if there is a difference, the impact is only within 0.3 degrees), it meets the requirements of human body temperature measurement. (For example: all brands of cars can run at a speed of 40 yards, and high-end cars may reach a speed of 200 yards, but there is no distinction between cars that specialize in running 40 yards and cars that specialize in running 200 yards, only the difference between high and low performance cars .)
The infrared body temperature monitor is a professional instrument suitable for quickly monitoring the body surface temperature in public places with a large flow of people. It has the advantages of non-contact temperature measurement, high accuracy, fast measurement speed, over-temperature voice alarm, etc. It is especially suitable for use in entry-exit ports, ports, airports, docks, stations, offices, schools, theaters and other occasions.
All objects with a temperature above zero will emit a certain proportion of infrared radiation energy according to their own temperature. The size of the radiant energy and its distribution according to the wavelength have a very close relationship with its surface temperature. The infrared wavelength emitted by the human body temperature (36~37℃) is 9~13чm. According to this principle, the surface temperature of the forehead of the human body can be accurately measured, and the accurate body temperature can be displayed by correcting the temperature difference between the forehead and the actual body temperature.
Human body infrared thermometer
The infrared thermometer is composed of optical system, photoelectric detector, signal amplifier, signal processing, display output and other parts. The optical system gathers the target infrared radiation energy in its field of view, and the size of the field of view is determined by the optical parts of the thermometer and its position. Infrared energy is focused on a photodetector and converted into a corresponding electrical signal. The signal passes through the amplifier and signal processing circuit, and is converted into the temperature value of the measured target after being corrected according to the algorithm of the internal treatment of the instrument and the emissivity of the target.
Principle of temperature measurement
The principle of infrared thermometer temperature measurement is to convert the radiation energy of the infrared rays emitted by the measured object into electrical signals. The magnitude of the infrared radiation energy is related to the temperature of the object itself, and the temperature of the object can be determined according to the magnitude of the converted electrical signal. All objects above absolute zero will radiate infrared rays by themselves. The function of the infrared thermometer is to collect the infrared rays emitted by the objects. It will not emit any harmful radiation at all, so it is completely harmless to the human body. Some people misunderstand that the infrared thermometer emits rays to the human body to produce readings. This concept is wrong.
