Temperature sensing element in direct contact with the measured object is not normally used to determine the above 1000 ℃. Moved, rotated or temperature or surface temperature of the reaction temperature of the object quickly.

Its advantage is:
1)Wide temperature range (no upper limit in theory) suitable for high temperature measurements.

2)Temperature process does not destroy the measured object temperature field does not affect the original temperature distribution;

3)Can measure the temperature of moving objects
Thermal inertia is small. Short response time of the detector. Temperature response speeds to about 2-3s, fast and easy to implement dynamic temperature measurement. Under certain conditions, such as nuclear radiation. Radiation thermometry can be accurate and reliable measurements.

The disadvantage of non-contact thermometer is:
1.It’s can not be directly measured the true temperature of the measured object. To get the real temperature. Needs to be corrected emissivity while the emission rate is a factor IMPACT quite complex parameters. This increases the difficulty of processing the measurement results

2. since the non-contact. Greater impact by the middle of the radiation thermometer to measure the medium. Do not be subject to the conditions in the industrial field. The surrounding environment is relatively poor; the middle of the media influence on the measurement results is even greater. In this regard Thermometer wavelength range is important to select.

3. Due to the complexity of the principles of radiation thermometry. Thermometer complex structure leads to higher prices.
Non-contact thermometer main include radiation thermometers, optical radiation thermometers, etc. Among the former is divided into total radiation thermometer, brightness thermometer (optical pyrometer, optical pyrometer) and colorimetric thermometer.

Both things have the two aspects: good and bad, just decide how you make use of it.
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