성균관대 열유체공학실습설계 온도측정 실험
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- 2015.02.28
- 최종 저작일
- 2014.04
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한컴오피스
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목차
1. Principle of Thermocouple
2. Thermocouple types
2.2 How to Distinguish Thermocouple types
3.1 Thermocouple Picture
3.2 Data from the Experiment
4.1 Calculation
4.2 Result
5.1 Type K
5.2 Error Cause Analysis
Reference
본문내용
1. Principle of Thermocouple
In 1821, the German–Estonian physicist Thomas Johann Seebeck discovered that when any conductor is subjected to a thermal gradient, it will generate a voltage. This is now known as the thermoelectric effect or Seebeck effect. Any attempt to measure this voltage necessarily involves connecting another conductor to the "hot" end. This additional conductor will then also experience the temperature gradient, and develop a voltage of its own which will oppose the original. Fortunately, the magnitude of the effect depends on the metal in use. Using a dissimilar metal to complete the circuit creates a circuit in which the two legs generate different voltages, leaving a small difference in voltage available for measurement. That difference increases with temperature, and is between 1 and 70 microvolts per degree Celsius (µV/°C) for standard metal combinations.
The voltage is not generated at the junction of the two metals of the thermocouple but rather along that portion of the length of the two dissimilar metals that is subjected to a temperature gradient.
참고 자료
http://en.wikipedia.org/wiki/Thermocouple
http://www.engineeringtoolbox.com/water-thermal-properties-d_162.html
http://www.thermometricscorp.com/thertypk.html
http://srdata.nist.gov/its90/useofdatabase/use_of_database.html