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http://dx.doi.org/10.7842/kigas.2020.24.2.44

Induction of the High Order Calibration Equation of Metal Oxide Semiconductor Gas Sensors  

Park, Gyoutae (Korea Gas Safety Corporation)
Kim, Kangmin (HIT Co., Ltd)
Lee, Hyeonggi (HIT Co., Ltd)
Yoon, Myeongsub (SD Electronics Co., Ltd)
Publication Information
Journal of the Korean Institute of Gas / v.24, no.2, 2020 , pp. 44-49 More about this Journal
Abstract
In this paper, a measuring circuit is designed through analyzing manufacture specification of the sensor based on MOS. And the best input-output polynomial are induced that really gas sensors are used in gas safety management industrial fields. Response characteristics of a MOS gas sensor is analysed by through sensor's output voltages are measured after standard gases with six kinds of concentrations are manufactured and are injected to the sensor. A lookup table is created by relations of sensor's output voltages by injecting gases with other concentrations. Because data of the formed lookup table are equal interval, a polynomial can be induced of method of approximation function. So the 5th polynomial of input-output for a sensor is defined, coefficients are calculated by using least squares method, and the 5th polynomial is completed for representing characteristics of the sensor. If the proposed polynomial is applied to gas leak detectors, an inverse transformation of polynomial and programing of array codes are recreated. In this research, polynomial is implemented with array types that intervals of values of a lookup table are one-fifth sampled and interpolated. The performance of proposed 5th calibration equation is verified that errors are reduced than a linear expression when tests are performed by measurement of concentrations against injection of standard gases.
Keywords
gas leak & sensor; calibration; polynomial; characteristics; MOS(metal oxide semiconductor);
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  • Reference
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