The application scope of the principle of Hengaode infrared thermometer
The temperature measuring principle of the infrared thermometer is to convert the radiant energy of the infrared radiation emitted by the object into an electrical signal. The size of the infrared radiant energy corresponds to the temperature of the object itself. According to the size of the electrical signal, the temperature of the object can be determined.
Thermometer principle
Infrared thermometer is composed of optical system, photoelectric detector, signal amplifier, signal processing, display output and so on. The optical system converges the target infrared radiation energy in its field of view, and the size of the field of view is determined by the optical parts of the thermometer and their positions. The infrared energy is focused on the photodetector and converted into a corresponding electrical signal. The signal passes through the amplifier and the signal processing circuit, and is converted into the temperature value of the measured target after being corrected according to the internal algorithm and target emissivity of the instrument.
In nature, all objects whose temperature is higher than absolute zero continuously emit infrared radiation energy to the surrounding space. The size of the infrared radiation energy of an object and its distribution according to wavelength are closely related to its surface temperature. Therefore, by measuring the infrared energy radiated by the object itself, it can accurately determine its surface temperature, which is the objective basis on which infrared radiation temperature measurement is based.
Infrared Thermometer Principle A black body is an ideal radiator. It absorbs radiant energy of all wavelengths, without energy reflection and transmission, and its surface emissivity is 1. However, practical objects existing in nature are almost not black bodies. In order to understand and obtain the infrared radiation distribution law, a suitable model must be selected in theoretical research. This is the quantized oscillator model of body cavity radiation proposed by Planck. The Planck blackbody radiation law is derived, that is, the blackbody spectral radiance expressed in wavelength, which is the starting point of all infrared radiation theory, so it is called the blackbody radiation law. In addition to the radiation wavelength and the temperature of the object, the radiation amount of all actual objects is also related to the types of materials that constitute the object, the preparation method, the thermal process, and the surface state and environmental conditions. Therefore, in order to apply the law of blackbody radiation to all real objects, a proportionality factor related to the material properties and surface state must be introduced, namely the emissivity. This coefficient indicates how close the thermal radiation of the actual object is to the blackbody radiation, and its value is between zero and less than 1. According to the law of radiation, as long as the emissivity of a material is known, the infrared radiation characteristics of any object are known. The main factors affecting emissivity are: material type, surface roughness, physical and chemical structure and material thickness.
When measuring the temperature of the target with an infrared radiation thermometer, first measure the infrared radiation amount of the target in its waveband, and then calculate the temperature of the measured target by the thermometer. The monochromatic thermometer is proportional to the radiation in the band; the dual-color thermometer is proportional to the ratio of the radiation in the two bands.
Application range
Measuring electrical equipment
Non-contact infrared thermometer can measure the surface temperature of an object from a safe distance, making it an indispensable tool in the maintenance operation of electrical equipment.
Application of electrical equipment
In the following applications, it can effectively prevent equipment failures and unplanned power failures.
Connector-Electrical connection will gradually loosen the connector, due to repeated heating (expansion) and cooling (shrinkage) generate heat, or surface dirt, carbon deposition and corrosion. Non-contact thermometers can quickly determine temperature rises that indicate serious problems.
Motor-In order to maintain the life of the motor, check whether the temperature of the power supply connection and the circuit breaker (or fuse) are the same.
Motor bearings-check for hot spots and regularly repair or replace them before problems arise that cause equipment failure.
Motor coil insulation layer-by measuring the temperature of the motor coil insulation layer, extend its life.
Measurement between phases-Check whether the temperature of the phases of the wires and connectors of induction motors, large computers and other equipment is the same.
The winding of the transformer-air-cooled device can be directly measured with an infrared thermometer to check the excessive temperature. Any hot spots indicate damage to the transformer winding.
Uninterruptible power supply-Determine the heating point of the connecting line on the UPS output filter. A low temperature point indicates that the DC filter circuit may be open.
Backup battery-Check the low-voltage battery to ensure proper connection. Poor contact with the battery connector may heat enough to burn the battery core rod.
Ballast-Check the ballast for overheating before it starts to smoke.
Utilities-Identify hot spots for connectors, wire connectors, transformers and other equipment. Some models of optical instruments have a range of 60: 1 or greater, so that almost all measurement targets are within the measurement range.
The difference between non-contact infrared thermometer and contact thermometer
Pay attention when using
To locate a hot spot, to find the hot spot, the instrument aims at the target, and then scans the target up and down until the hot spot is determined.
The temperature cannot be measured through glass. Glass has very special reflection and transmission characteristics, and does not allow accurate infrared temperature readings. But the temperature can be measured through the infrared window. Infrared thermometers are best not used for the measurement of bright or polished metal surfaces (stainless steel, aluminum, etc.).
Only the surface temperature is measured, and the infrared thermometer cannot measure the internal temperature.
Pay attention to environmental conditions: steam, dust, smoke, etc. It blocks the optical system of the instrument and affects accurate temperature measurement.
Ambient temperature, if the thermometer is suddenly exposed to an ambient temperature difference of 20 ° C or higher, allow the instrument to adjust to the new ambient temperature within 20 minutes.
1. To avoid damage to the infrared thermometer, first use compressed air to remove large particles and dust, then wipe with a cloth.
2. Gently use a slightly moistened non-corrosive solution or mild diluted soap solution (solution or mild diluted soap solution) for cleaning the lens Medium) agent) wipe the lens with a soft cotton cloth (do not immerse the cloth in liquid). Use a clean computer monitor cleaning cloth to gently wipe the display.
3. Use a clean computer monitor cleaning cloth to gently wipe the display.
4. Use a clean and slightly damp cloth to gently wipe the body of the thermometer. If necessary, soak the cloth with a solution of water and a small amount of mild soap.
5. After use, please put the infrared thermometer on the lens cover as soon as possible, and put it in the carrying case to save.
select
Performance indicators, such as temperature range, spot size, operating wavelength, measurement accuracy, response time, etc .; environmental and working conditions, such as ambient temperature, window, display and output, protection accessories, etc .; other options, such as ease of use and maintenance And calibration performance and price, etc., also have a certain impact on the choice of thermometer. With the technology and continuous development, the best design and new progress of infrared thermometers provide users with various functions and multi-purpose instruments, which expands the choice
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