Infrared thermometer must correctly correspond to the choice
Infrared thermometer must correctly correspond to the choice
Infrared temperature measurement technology in our country for product quality control and monitoring, equipment online troubleshooting, protection and energy saving is playing an important role. In the past two decades, non-contact infrared thermometer in the rapid development of technology, performance continues to improve, the scope of application is also expanding, the market share grows year by year. Compared with the contact temperature measurement method, infrared temperature measurement has a fast response time, non-contact, safe to use and long service life and other advantages. Digital noise meter also plays a role in measuring the sound size.
The working principle of the external measuring line thermometer.
Understanding the group outside the thermometer's working principle, technical indicators, environmental working conditions and operation and maintenance is to help users to correctly select and use infrared thermometer.
All the objects with temperature above zero are constantly emitting infrared radiation energy to the surrounding space. Objects of infrared radiation characteristics of the size of the radiant energy and its distribution by wavelength and its surface temperature has a very close relationship. Therefore, through the measurement of the infrared energy radiated by the object itself, it will be able to accurately determine its surface temperature, which is based on the objective basis of infrared radiation temperature measurement.
Pyrometer blackbody radiation law.
Blackbody is an idealized radiation body, it absorbs all wavelengths of radiant energy, no energy reflection and transmission, the emissivity of its surface is 1. It should be pointed out that there is no real blackbody in nature, but in order to clarify and obtain the law of distribution of infrared radiation in the theoretical study must be selected to the appropriate model, which is the quantization of the radiation of the body cavity of the quantized vibronic model proposed by the Jintai Science Instrument, which leads to a Jintai The law of the black body radiation of the science instrument, that is, expressed in wavelengths of the black body spectral radiance, which is the starting point of all infrared radiation theory, it is called the law of the black body radiation.
Thermometer object emissivity effect on radiometric temperature measurement:
Almost all actual objects that exist in nature are not black bodies. The radiation of all real objects in addition to relying on the wavelength of the radiation and the temperature of the object, but also with the type of material constituting the object, the preparation method, the thermal process, as well as the surface state and environmental conditions and other factors. Therefore, in order for the blackbody radiation law to apply to all real objects, a scaling factor, the emissivity, which is related to the nature of the material and the state of the surface, must be introduced. This coefficient expresses the closeness of the thermal radiation of a real object to the blackbody radiation, and has a value between zero and a value less than one. According to the law of radiation, once the emissivity of a material is known, the infrared radiation characteristics of any object are known.
