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Briefly discuss the different physical principles that are used in temperature measuring instruments and give examples...

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Electrical Engineering

Briefly discuss the different physical principles that are usedin temperature measuring instruments and give examples ofinstruments that use each of these principles.

1. The thermoelectric effect

2. Resistance change

3. Sensitivity of semiconductor device

4. Radiative heat emission

5. Thermography

6. Thermal expansion

7. Sensitivity of fiber-optic devices

8. Color change

9. Change of state of material

Answer & Explanation Solved by verified expert
3.6 Ratings (366 Votes)
There are four basic types of temperature measuring devices each of which uses a different principle 1 Mechanical devices liquidinglass thermometers bimetallic strips bulb capillary pressure type etc 2 Thermojunctive thermocouples 3 Thermoresistive RTDs and thermistors 4 Radiative infrared and optical pyrometers principle of operation A change in temperature causes some kind of mechanical motion typically due to the fact that most materials expand with a rise in temperature Mechanical thermometers can be    See Answer
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