Infrared thermometers determine wavelength range
The emissivity and surface properties of the target material determine the corresponding wavelength of the thermometer's spectrum. For high reflectivity alloy materials, there is a low or varying emissivity. In the high temperature region, the best wavelength for measuring metal materials is near-infrared, and 0.8-1.0 μm can be selected. Other temperature zones can choose 1.6μm, 2.2μm and 3.9μm. Since some materials are transparent at certain wavelengths, infrared energy will penetrate these materials, and special wavelengths should be selected for this material. For example, the wavelengths of 1.0μm, 2.2μm and 3.9μm (the glass to be tested should be very thick, otherwise it will pass through) are selected for measuring the internal temperature of the glass; 5.0μm is selected for measuring the surface temperature of the glass; For example, 3.43μm is used for measuring polyethylene plastic film, 4.3μm or 7.9μm for polyester, and 8-14μm for thickness exceeding 0.4mm. For example, the narrow band of 4.64μm is used to measure CO in the flame, and 4.47μm is used to measure the NO2 in the flame.
