Radiation law of human body infrared thermometer
The temperature measurement principle of human body infrared thermometer
The principle of temperature measurement by an infrared thermometer is to convert the radiant energy of infrared rays emitted by the object being measured into an electrical signal. The amount of infrared radiation energy is related to the temperature of the object itself. According to the size of the converted electrical signal, the temperature of the object can be determined. All objects above absolute zero will radiate infrared rays on their own. The function of an infrared thermometer is to collect the infrared rays emitted by objects. It does not emit any harmful radiation at all, so it is completely harmless to the human body. Some people misunderstand that infrared thermometers emit rays to the human body to produce readings. This concept is wrong.
Advantages of human body infrared thermometer
1. Convenience
Infrared thermometers can quickly provide temperature measurements. The fastest way for influenza to spread is in large public places. If prevention is not actively carried out, influenza will spread quickly. The human body infrared thermometer can quickly monitor everyone's body temperature and prevent influenza in a timely manner.
2. Accurate
Another advanced feature of infrared thermometers is their accuracy, usually within 1 degree. In other words, the temperature will not differ too much when measuring human body temperature. When measuring the temperature with a human infrared thermometer, you can quickly determine whether the person being measured has a fever based on the detected temperature.
3. Safety
Safety is the most important benefit of using an infrared human thermometer. Compared with traditional mercury thermometers, human infrared thermometers can directly measure temperature without directly contacting a certain part of the human body. Mercury thermometers are also easy to damage, and the mercury inside can easily pollute the environment and cause damage to the human body. Infrared thermometers have laser aiming, which makes it easy to identify target areas. With it, work in airports, stations, hospitals, etc. becomes much easier.
4. Wide range
Human body infrared thermometer can be used in airports, bus stations, railway stations and other places with high traffic volume. It can measure human body temperature very conveniently and quickly.
5. Comprehensive functions
The human body infrared thermometer is a rear-projection liquid crystal (LCD) digital display with an automatic shutdown and power-saving function. It can not only display the temperature of the human body, but also display the time, ambient temperature and humidity, etc., and also has an automatic sound prompt function.
Radiation law of human body infrared thermometer
All objects in nature with a temperature higher than absolute zero (-273.15°C) are constantly radiating electromagnetic waves, including infrared bands, to the surrounding space due to the thermal motion of molecules. The relationship between the radiation energy density and the temperature of the object itself is consistent with radiation. law.
The temperature measuring instrument made using this principle is called an infrared temperature instrument. This kind of measurement does not require contact with the object being measured, so it is a non-contact measurement. Infrared temperature meters have a wide temperature measurement range, from -50°C to over 3000°C. In different temperature ranges, the wavelength distribution of the electromagnetic wave energy emitted by the object is different. In the normal temperature range (0~100℃), the energy is mainly concentrated in the mid-infrared and far-infrared wavelengths. Instruments used in different temperature ranges and for different measurement objects have different specific designs.
