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The emissivity and surface properties of the target material determine the spectral response wavelength of the pyrometer. For high reflectivity alloy materials, there is low or varying emissivity. In the high temperature area, the best wavelength for measuring metal materials is near infrared, and {{0}}.8-1.{{10}} μm can be selected. Other temperature zones can choose 1.6μm, 2.2μm and 3.9μm. Since some materials are transparent at a certain wavelength, infrared energy will penetrate these materials, and a special wavelength should be selected for this material. For example, 1.0μm, 2.2μm and 3.9μm are used to measure the internal temperature of the glass (the glass to be tested must be very thick, otherwise it will pass through) wavelengths; 5.0μm is used to measure the surface temperature of the glass; For example, 3.43μm is used for measuring polyethylene plastic film, 4.3μm or 7.9μm is used for polyester, and 8-14μm is used for thickness exceeding 0.4mm. For example, the narrow band 4.64μm is used to measure CO in the flame, and 4.47μm is used to measure NO2 in the flame. determine response time
The response time indicates the reaction speed of the infrared thermometer to the measured temperature change, which is defined as the time required to reach 95 percent of the energy of the final reading, which is related to the time constant of the photodetector, signal processing circuit and display system. The response time of the new infrared thermometer in the infrared era can reach 1ms. This is much faster than contact temperature measurement methods. If the moving speed of the target is very fast or when measuring a fast-heating target, a fast-response infrared thermometer should be selected, otherwise the sufficient signal response will not be achieved, and the measurement accuracy will be reduced. However, not all applications require a fast-response infrared thermometer. For static or target thermal processes where thermal inertia exists, the response time of the pyrometer can be relaxed. Therefore, the choice of the response time of the infrared thermometer should be adapted to the situation of the measured target. Determining the response time is mainly based on the moving speed of the target and the temperature change speed of the target. For static targets or target parameters in thermal inertia, or the speed of existing control equipment is limited, the response time of the thermometer can relax the requirements.
