Advantages and disadvantages of non-contact temperature measuring instruments
The non-contact temperature measuring instrument is mainly a temperature sensor based on the heat radiation mechanism. The biggest feature of this type of temperature sensor is the sensor's
No part is in contact with the measured medium, and it realizes temperature measurement by measuring the radiant energy of the object or the signal related to the radiant energy.
Since it does not need to be in contact with the measured medium, the non-contact temperature measuring instrument has the following advantages:
1. There is no temperature measurement and heat transfer error caused by the heat transfer caused by contact;
2. Without destroying the measured temperature field, objects with small heat capacity can be measured;
3. In theory, the upper limit of temperature measurement is not limited by the temperature sensor material;
4. The dynamic performance is good, the response speed is fast, and the temperature of the moving object can be measured;
5. Two-dimensional temperature distribution can be measured.
There are also some disadvantages of non-contact temperature measuring instruments:
1. The measurement error is relatively large, and the indicated value of the meter generally only represents the surface appearance temperature;
2. The interference of medium absorption and reflected light on the radiation channel will affect the display value of the instrument;
3. The emissivity change of the measured temperature surface will affect the measurement value of the instrument;
4. The structure is more complicated and the price is more expensive.
