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Summary: With the continuous development of technology, the design and development of infrared thermometer provides users with multiple functions and multi-function instruments, thereby expanding the range of choices.
Release time:
2021/03/08
With the continuous development of technology,infrared thermometerThe design and development of provides users with a variety of functions and multi-functional instruments, thereby expanding the range of choices. When choosing a thermometer model, first determine the measurement requirements, such as the temperature of the measured object, the size of the measured object, the measurement distance, the material of the measured object, and the environment The position of the target, response speed, measurement accuracy, whether it is portable or online, etc.
In the comparison of the existing temperature meter, selected can meet the above requirements of the instrument model; Among the many models that can meet the above requirements, choose the best combination of performance, function and price. Other options such as ease of use, maintenance and calibration performance.
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1.Determine the temperature measurement range
Temperature measurement range is an important performance index of thermometer. Each thermometer has its own specific temperature measurement range. In general, the narrower the temperature measurement range, the higher the resolution of the output signal used to monitor the temperature, and the easier it is to solve the accuracy and reliability. An excessively large temperature measurement range reduces the temperature measurement accuracy. For example, if the measured target temperature is1000Celsius, then first determine whether it is online or portable, and whether it is portable.
2.Determine target dimensions
In order to obtain an accurate temperature reading, the distance between the thermometer and the test target must be within the appropriate range. The so-called``Spot size''is the measuring point area of the thermometer. The further you are from the target, the larger the spot size.
According to the principle, infrared thermometers can be divided into single-color thermometers and two-color thermometers (radiation colorimetric thermometers). For monochrome thermometers, when measuring temperature, the measured target area should fill the field of view of the thermometer. It is recommended that the size of the measured target exceeds the field of view.50%. If the size of the target is smaller than the field of view, the background radiation energy will enter the visual and auditory symbols of the thermometer, thereby interfering with the temperature measurement reading, resulting in errors. Conversely, if the target is larger than the field of view of the thermometer, the thermometer will not be affected by the background outside the measurement area. For colorimetric thermometers, the temperature is determined by the ratio of radiant energy in two independent wavelength bands. Therefore, when the measured target is small, the field of view will not be filled, and the smoke, dust and obstacles on the measurement path will weaken the radiation energy, so it will not affect the measurement result. Even if the energy decays95%, the required temperature measurement accuracy can still be guaranteed.
For moving or vibrating small objects, colorimetric thermometers are the preferred choice. This is due to the light's small diameter, good flexibility, and ability to transmit light radiation energy in curved, blocked and folded channels, so it can measure targets that are difficult to access under harsh conditions or when approaching electromagnetic fields.
3.Determine distance coefficient
The distance coefficient is givenD:SThe ratio is determined, I .e., the distance between the thermometer's probe and the targetDRatio to the diameter of the object being measured. The higher the optical resolution,D:SThe higher the ratio, the higher the cost of the thermometer.
If the thermometer must be installed far away from the target due to environmental restrictions, and you want to measure small targets, you should choose a thermometer with high optical resolution. For a thermometer with a fixed focal length, this point is a smaller position at the focal point of the optical system, and points closer and farther than this focal point will increase.
Therefore, in order to accurately measure the temperature at the distance close to the focal point and far from the focal point, the size of the measured target should be larger than the spot size at the focal point. The smaller focus position of the zoom thermometer can be adjusted according to the distance from the target. IncreaseD:Swill reduce the amount of energy received. If the receiving aperture is not increased, it is difficult to increase the distance coefficientD:SThis will increase the cost of the instrument.
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