The infrared thermometer must be correctly selected accordingly
Infrared temperature measurement technology is playing an important role in product quality control and monitoring, equipment online fault diagnosis, safety protection, and energy conservation in China. In the past two decades, non-contact infrared thermometers have rapidly developed in technology, continuously improved in performance, expanded in applicability, and increased in market share year by year. Compared to contact temperature measurement methods, infrared temperature measurement has advantages such as fast response time, non-contact, long usage and service life. The digital noise meter also plays a certain role in measuring sound level.
Working principle of external line thermometer:
Understanding the working principle, technical specifications, environmental working conditions, operation and maintenance of external temperature detectors is to help users choose and use infrared temperature detectors correctly.
All objects with temperatures above * * zero are constantly emitting infrared radiation energy into the surrounding space. The infrared radiation characteristics of an object are closely related to the size and wavelength distribution of radiation energy, as well as its surface temperature. Therefore, by measuring the infrared energy emitted by an object itself, its surface temperature can be accurately measured, which is the objective basis for infrared radiation temperature measurement.
Thermometer blackbody radiation law:
Blackbody is an idealized radiator that absorbs radiation energy of all wavelengths without any reflection or transmission of energy. Its surface emissivity is 1. It should be pointed out that there is no real blackbody in nature, but in order to understand and obtain the distribution law of infrared radiation, it is necessary to choose a suitable model in theoretical research. This is the quantized oscillator model of body cavity radiation proposed by Jintai Science Instrument, which derives the law of blackbody radiation of Jintai Science Instrument, that is, the spectral radiance of blackbody expressed in wavelength. This is the starting point of all infrared radiation theories, hence it is called the blackbody radiation law.
The influence of emissivity of thermometer objects on radiation temperature measurement:
Almost all actual objects that exist in nature are not black bodies. The radiation amount of all actual objects is not only dependent on the wavelength of radiation and the temperature of the object, but also on factors such as the type of material, preparation method, thermal process, surface state, and environmental conditions that make up the object. Therefore, in order for the blackbody radiation law to apply to all practical objects, it is necessary to introduce a proportional coefficient related to material properties and surface states, namely emissivity. This coefficient represents the proximity between the thermal radiation of the actual object and the blackbody radiation, with a value between zero and a value less than 1. According to the law of radiation, as long as the emissivity of a material is known, the infrared radiation characteristics of any object are known.
