The working principle of the infrared thermometer

Infrared thermometer is a kind of common measuring instruments, with fast response time, stable performance, flexible use and high reliability etc, are widely used in many fields. What is the working principle of infrared thermometer?

infrared thermometer is a kind of common measuring instruments, with fast response time, stable performance, flexible use and high reliability etc, are widely used in many fields. What is the working principle of infrared thermometer? Below small make up to introduce, hope you can help to you.

working principle of the infrared thermometer

to understand the working principle, technical index of infrared thermometer, environmental working conditions and operation and maintenance is the user correctly choose and use the basis of infrared thermometer. The optical system within its field of view of target infrared radiation energy, the size of the field is decided by the optical parts and positions of the thermometer. Infrared energy focusing on the photoelectric detectors and translated into corresponding electrical signals. The signal after amplifier and signal processing circuit according to the instrument internal algorithm and the target emission rate adjusted to the temperature of the measured target. In addition, target and thermometer should also be considered in the environmental conditions, such as temperature, atmosphere, pollution and interference factors such as the impact on the performance index and correction method.

all temperature above absolute zero objects are constantly emit infrared radiation energy into the surrounding space. The size of the object's infrared radiation energy and wavelength distribution & ndash; — With its surface temperature has a very close relationship. Therefore, based on the object of the radiation of infrared energy measurement, can accurately determine its surface temperature, which is the objective basis which is the basis of the infrared radiation temperature measurement.

blackbody radiation law: black body is an idealized radiator, it absorbs all the wavelengths of the radiation energy, through reflection and no energy, its surface emissivity is 1. Should point out that does not exist in nature really bold, but in order to find out and get the infrared radiation distribution, must choose the right model in the theoretical research, the quantization of the cavity is put forward by the Planck radiation oscillator model, and derived the Planck blackbody radiation law, i. e. , according to the wavelength of blackbody radiation spectrum, it is the starting point of all the infrared radiation theory, therefore calls the blackbody radiation law.

object emissivity effects of radiation temperature measurement existing in the nature of the actual object, almost not bold. All the wavelength of the radiation in addition to the actual object depends on the radiation and the temperature of the object, and constitute a kind of material objects, the preparation method, thermal process and surface state and environmental conditions and other factors. Therefore, in order to make the blackbody radiation law applies to all real objects, must introduce a related to material properties and surface state of proportional coefficient, the emission rate. The coefficient of said of the actual object heat radiation and the close degree of blackbody radiation, its value between zero and less than 1. According to the law of radiation, as long as know the emissivity of the material, will know that the infrared radiation characteristics of any object.

affect emissivity for yarn mainly in the following aspects: material, surface roughness, physical and chemical structure and material thickness, etc.

when using infrared radiation thermometer to measure the temperature of the target first to measure the target within the band of infrared radiation, then the temperature of the measured target is calculated from thermometer. Monochromatic is proportional to the radiation thermometer and band; Two-color thermometer with two wavelengths is proportional to the ratio of the radiation.

infrared system: infrared thermometer by optical system, photoelectric detector, signal amplifier, signal processing and display output parts. Optical system convergence within its field of view of target infrared radiation energy, the size of the field by the thermometer optical components and their location. Infrared energy focusing on the photoelectric detector and translated into corresponding electrical signals. The signal after amplifier and signal processing circuit, and according to the instrument after cure correction algorithm and the target of emission rate to the temperature of the measured target.