Two-colour solid state pyrometer operating principle guide
Guidance on the operating principle of the two-color fixed thermometer: The two-color infrared thermometer is a type of infrared thermometer. It can also be called a fiber-optic two-color infrared thermometer, which measures the infrared radiation brightness emitted by an object in two different spectral ranges and infers the temperature of the object from the ratio of the two radiation brightness, which 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 industries. The main performance indicators of fixed infrared thermometers include 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 industries to measure the temperature of instruments and meters to detect the operating status of instruments 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 consists of an optical system, a color separation film or filter, an infrared detector, a signal processor and a display output part. A two-color thermometer measures the radiance emitted by an object in two different spectral ranges, and converts the ratio of the two radiances into the temperature of the object. Therefore, in principle, it is fundamentally different from a single-color thermometer. Two-color thermometers 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 changes in temperature. When the temperature changes slightly, the ratio of the signals in the two bands is still large, which will give the instrument a greater temperature resolution.
Advantages of online temperature measurement of infrared thermometers in the steel industry
Thermometers are used in the steel industry because products are in motion and have very high temperatures. Common steel industry applications are where the temperature is a constant state where molten steel begins to transform into blocks. Reheating the steel to the same temperature is key to preventing it from deforming, and infrared thermometers are used to measure the internal temperature of the regenerator. In high temperature rotary mills, infrared thermometers are used to confirm that product temperature is within rotation limits. In cooling mills, infrared thermometers monitor the temperature of the steel as it cools.
Guidance on the operating principle of the two-color fixed thermometer: In the glass industry, infrared thermometers are heated to very high temperatures. Infrared thermometers are used to monitor the temperature in furnaces. Handheld sensors detect hot spots by measuring the outside. Measure the temperature of the molten glass to determine the appropriate furnace mouth temperature. In flat glass products, sensors detect the temperature at each processing stage. The wrong temperature or too rapid a temperature change can cause uneven expansion or contraction. For bottle and container products, the molten glass flows to a forehearth that is kept at the same temperature. Infrared thermometers are used to detect the temperature of the forehearth glass. So it should be in the appropriate state at the exit point. In fiberglass products, infrared sensors are used in processing furnaces 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 glass products.
Application of two-color infrared thermometer in plastic industry:
In the plastics industry, infrared thermometers are used to avoid product contamination, measure dynamic objects and measure high-temperature plastics. As the blown film is ejected, temperature measurements to adjust for heating and cooling can help maintain the integrity of the plastic's tension and its thickness. During the ejection process of the thrown film, the sensor helps control the temperature to ensure the thickness and uniformity of the product. As the sheet is being extruded, sensors allow the operator to adjust the extinguishing of the heater and cold roll to maintain product quality.
