Xiang-zhong LI, An-li TAO, Li-na HAN, Jun-guo LIU, Yun-zhou LI, Shao-gang LI
College of Information and Electrical Engineering, Shandong University of Science and Technology, Qingdao 266510, China
Abstract—There are large errors of linear measurement when the thermocouple measure temperature as temperature sensor. In order to improve the measurement precision, the sensor cold junction compensation and nonlinear compensation are usually needed. For the circumstances that the cold junction’s temperature is determinate, there is biggish nonlinear between thermoelectric power and temperature signals of the thermocouple sensor’s output. In order to solve the problem, this paper proposed a practical method of linear compensation, introduced the principle of linear compensation and gave the corresponding compensation circuit and circuit analysis. This circuit has the characteristic of simpleness, high reliability, small linear error and so on.
Keywords—nonlinear; thermocouple; compensation
Manuscript Number: 1674-8042(2010)supp.-0104-03
dio: 10.3969/j.issn1674-8042.2010.supp..28
References
[1] Zhangming, XielieMin, 2007. Computer Measurement and Control Technology. National Defense Industry press.
[2] Sun Hui-ming, Yu quan,2000. Smart pressure sensor external circuit design. Natural Science Edition,17 (1): 52 - 54.
[3] Wang Xue-wen, Zhang Zhiyong, 2004. Sensors Theory and Application. Beijing University of Aeronautics And Astronautics University Press.
[4] Peng Jun, 2003. Sensor and detection technology. Xi'an University of Electronic Science and Technology Press.
[5] Jin qingfa, 2006. Sensor technology and applications. Mechanical Industry Press.
[6] Gao fuguo, 2005. Intelligent Sensor and Its Application. Chemical Industry Press.
[full text view]
