A pyrometer is any temperature measuring device that includes a sensor and a reading. However, in this section we will only discuss radiation. A radiant thermometer is a non-contact temperature sensor that detects the temperature of an object by detecting naturally emitted thermal radiation.
Laser pyrometer working rule
An optical system, as shown in the figure, collects the visible and infrared energy of an object and focuses it on a detector. The detector converts the collected energy into an electrical signal to control the temperature display or control unit. The photon energy detector receives the optical system and converts it into an electrical signal. Two types of detectors are used: thermal (thermal) and photon (photosynthetic tubes). Photon detectors are much faster than the thermopile type. This allows you to use the photon type to measure the temperature of small, fast-moving objects.
Radiation thermometers are used to measure the temperature of very hot objects without contact with them. Molten glass and molten metals are common objects during the casting and molding operations. There are several factors to consider when choosing the right radiation thermometer for an application. In the case of narrow or wide vision, the cross section can be very different.
Depending on the type of openings used in the equipment, it can be rectangular, circular and slotted. In some instruments, a telescopic eye magnifies radiant energy to measure smaller objects over longer distances. In some instruments, hot objects can be measured up to 1/16 inch in diameter. The construction of instrumental components such as lenses and curved mirrors controls the path of the landscape.
Structural materials determine the optical properties of the device. For example, glass does not transmit light much beyond 2.5 microns. Therefore, it is only suitable for high temperature applications where there are high energy outputs. Other common optical materials are quartz (which transmits well to 4 microns) and crystalline calcium fluoride (which transmits approximately 10 microns).
Bandwidth filters are used in some devices to cut off unwanted light at certain wavelengths.
The difference between an optical meter and a radiation meter
Advantages of using a laser pyrometer
- Radiation thermometer has high efficiency and medium cost.
- It has the ability to measure high temperatures.
- Has a quick response.
- It has good stability.
- It has no physical connection with the purpose of the measurement.
- The design around the radiation is naturally complex.
- It has a non-linear scale.
- Possible errors due to pressure on gases or vapors in the intervention and absorption of radiation.
- Release of the desired substance that affects the measurement.
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