적외선 가연성가스 센서의 입출력 특성 및 캘리브레이션 연구

In this paper, we conducted a study of the calibration to grasp the input and output characteristics of the two types of gas sensors to be used in a flammable gas detector. In fact, when developing gas detectors, there are many difficulties, which the specifications listed in the sensor and the measured data values are not matched each other. It is necessary validation and calibration of specifications when sensors are used practically. In this study, the output voltages were measured by inputs of 8 kinds of standard gases into the two types of infrared gas sensor. The linear regression function derived by using least square estimation to represent the output voltages. When inverting the derived linear regression function and actually measuring its approximation equation, errors occur due to pressure of gas injection, temperature, humidity and nonlinearity of circuits. In order to reduce these errors and optimize responses of sensor"s inputs and outputs, we adjusted the slope and offset of the designed equation. Also, it is confirmed through experiment that the output according to the input is linear other than before.