Laser coaxial high temperature thermometer can penetrate the principle of glass measurement guidance
Laser coaxial high temperature thermometer can penetrate the principle of glass measurement guidance:
Laser coaxial high-temperature pyrometer emissivity to determine the emissivity of the object
The intensity of infrared radiation emitted from an object depends on the temperature of the object and the radiation characteristics of the surface material of the object. We use the emissivity (ε - Epsilon ) parameter to describe the ability of the object to radiate energy outward. The emissivity can range from 0 to 100% . The “bold body†we usually refer to is an ideal radiation source with an emissivity of 1.0 , and the emissivity of a mirror is generally 0.1 . If the emissivity selected when measuring temperature with an infrared thermometer is too high, the temperature displayed by the pyrometer will be lower than the true temperature of the measured target—assuming that the temperature of the measured target is higher than the ambient temperature.
Low emissivity (reflective surface) objects due to interference from other external radiation or measurement errors caused by background objects (flames, heating systems, refractory materials), in this case reducing measurement errors, very careful installation and protection of the probe Avoid reflective sources of radiation.
Laser coaxial high temperature pyrometers determine the unknown emissivity of an object by following these steps:
- Use other contact instruments to determine the true temperature of the measured object. Then use an infrared thermometer to measure the object. By adjusting the emissivity setting, the displayed value of the infrared thermometer is the same as the real temperature of the object.
- For low-temperature type thermometers, a part of the surface of the measured object can be leveled with a black pigment with an emissivity of 0.98 , the emissivity of the infrared thermometer is adjusted to 0.98 , the temperature of the part is measured, and the phase is measured. Adjacent to the edge temperature and adjust the emissivity until the displayed value is consistent with the temperature just measured.
Laser coaxial high temperature thermometer typical emissivity
When none of the above methods can help you determine the emissivity of an object, you can use the emissivity table given in the attached table. This is just an average and the emissivity of the actual material depends on the following factors:
- Material temperature
- Measurement angle
- Surface geometry
- Material thickness
- Surface structure of the material ( polished, oxidized, rough, sandblasted ) .
- measured spectral range
- Transmittance (such as thin film)
Laser coaxial high temperature thermometer working principle
Any object has infrared radiation, and the radiation intensity changes with temperature. The infrared radiation temperature range used in the thermal radiation is 1 μm - 20 μm . The radiation intensity of an object depends on the material of the object. We use a known constant to describe the characteristics of infrared radiation emitted by various materials. This is the emissivity (see the Emissivity Chart).
An infrared thermometer is an optoelectronic sensor that receives infrared radiation and converts it into a measurable electrical signal. It consists of the following components: lens, detector, electronics (amplifier / linearization / signal processing).
The specification of the lens determines the path of the infrared thermometer. This characteristic is expressed as the ratio of distance to spot size.
The spectral filter selects the spectral range associated with the temperature measurement. The detector and the electronic circuit together convert the energy of the infrared radiation into an electrical signal.
working principle:
Any object has infrared radiation, and the radiation intensity changes with temperature. The infrared radiation temperature range used in the thermal radiation is 1 μm - 20 μm . The radiation intensity of an object depends on the material of the object. We use a known constant to describe the characteristics of infrared radiation emitted by various materials. This is the emissivity (see the Emissivity Chart).
An infrared thermometer is an optoelectronic sensor that receives infrared radiation and converts it into a measurable electrical signal. It consists of the following components: lens, detector, electronics (amplifier / linearization / signal processing).
The specification of the lens determines the path of the infrared thermometer. This characteristic is expressed as the ratio of distance to spot size.
The spectral filter selects the spectral range associated with the temperature measurement. The detector and the electronic circuit together convert the energy of the infrared radiation into an electrical signal.
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