Guide to the operating principle of the two-color fixed thermometer
Guidance on the operating principle of the two-color fixed thermometer: The two-color infrared thermometer is a kind of infrared thermometer. It can also be called a fiber optic two-color infrared thermometer, which measures the infrared radiance emitted by an object in two different spectral ranges and infers the temperature of the object from the ratio of the two radiant luminances. It is called a two-color thermometer. In fact, the two-color thermometer does not have the meaning of brightness and color. Compared with the brightness thermometer (optical pyrometer), the two are different in principle. The meaning of "color" here should be infrared wavelength or spectrum, that is, "double infrared spectrum thermometer"
The two-color online thermometer is an effective tool for detecting and diagnosing electronic equipment failures. There are many varieties of fixed infrared thermometers, and different series play an important role in their respective applicable industries. The main performance indicators of fixed infrared thermometers are spectral response, response time, repeatability and emissivity. Fixed infrared thermometers are used in glass and ceramic industries, papermaking and packaging industries, various kiln temperature measurement applications, and chemical industry to measure the temperature of instruments and meters, so as to detect the operating status of instruments and meters and ensure the normal operation of an instrument. run.
Guidance on the operating principle of the two-color fixed thermometer:
The two-color infrared thermometer is composed of an optical system, a color separation film or a filter, an infrared detector, a signal processor and a display output part. The two-color thermometer measures the luminance emitted by the object in two different spectral ranges, and converts the ratio of the two radiances into the temperature of the object. Therefore, it is fundamentally different from the monochrome thermometer in principle. The key to the instrument lies in the selection of the two bands. The selection principle is: the signal ratio of the two bands is sensitive to temperature changes. When the temperature has a small change, the ratio of the signals in the two bands is still large, which will make the instrument have a larger temperature resolution.
Guidance on the operating principle of the two-color fixed thermometer: Infrared thermometers are used in the glass industry to be heated to very high temperatures. Infrared thermometers are used to monitor the temperature in the furnace. Hand-held sensors detect hot spots by measuring outside. Measure the temperature of the molten glass to determine the proper furnace mouth temperature. In flat glass products, sensors detect the temperature at every processing stage. Wrong temperature or too rapid temperature change can cause uneven expansion or contraction. For bottle and container products, the molten glass flows to a forehearth maintained at the same temperature. Infrared thermometers are used to detect the temperature of the glass in the forehearth. So it should be in the proper state where it is exported. In fiberglass products, infrared sensors are used in the processing furnace to detect the temperature of the glass in the forehearth. Another use of infrared sensors in the glass industry is in the process of windshield products.
Application of two-color infrared thermometer in plastic industry:
The operating principle guidance of the two-color fixed thermometer can also play a role in preventive maintenance:
Online infrared thermometers are mostly used for online temperature measurement at industrial production sites. They measure and transmit/display the temperature of a certain part of the production line in real time in the control room, and even directly participate in closed-loop control. Such a thermometer generally requires long-term stability and reliability.
The difference between online and hand-held infrared thermometers lies in the use environment and temperature measurement accuracy. Hand-held infrared thermometers can be used in indoor and outdoor working environments because they are easy to carry, and are basically not limited by the environmental site, but relatively Compared with the online infrared thermometer, its temperature measurement accuracy is slightly worse. The online infrared thermometer is larger than the handheld, and it is not easy to move. It is limited by the use of the site, but its temperature measurement accuracy is high, and it can also be measured online. Temperature comparison and analysis are not available in handheld thermometers. Of course, the price of online thermometers is also higher than that of handheld thermometers. In terms of industry, the accuracy of online thermometers is much higher.
