XING Tao¹, XIU Debin¹, WANG Zhili¹, SHI Yunbo^{1, 2}, WANG Liquan²

(1.College of Measurement-Control Tech & Communications Engineering of Harbin University of Science & Technology,

Harbin 150080; 2. Mechanical Engineering Post-Doctoral Research Station of Harbin Engineering University,Harbin 150001)

Abstract: Through analyses of the sensitivity-concentration relation curve of a kind of chlorine gas sensors, a simple mathematic model was established, and a power function curves correcting circuit was designed based on this model. In this circuit a real-time analog computational unit  AD538 was used for exponentiation of some noninteger power with values at interval (2.5-5). The results show that this circuit has good linearity and the relative accuracy is less than ±2%.

Key words:  chlorine gas sensor, nonlinear compensation