Abstract:
PURPOSE: A gas sensor and a manufacturing method thereof are provided to make the manufacturing process simple by forming holes on the lower side of a sensor unit by injecting etching gas through etching holes formed previously. CONSTITUTION: A gas sensor includes a substrate, an insulating layer, a sensor unit, an electrode pad, first holes, and second holes. The substrate(300) has a plurality of grooves(301). The insulating layer is formed on the top of the substrate. The sensor unit(310) and the electrode pad are formed on the insulating layer. The first holes(340) for etching are formed by removing the insulating layer around the sensor unit. The second holes(350) are formed through the first holes on the lower part of the sensor unit for thermal isolation.
Abstract:
A gas sensor circuit is provided to make the structure of a calculating circuit simple by reducing the noise on an output signal by the temperature. A gas sensor circuit comprises an infrared sensor(100) and a clipping part(300). The infrared sensor receives the infrared ray emitted from the infrared light source. The clipping part is connected to the infrared sensor. The clipping part clips the inputted signal with the maximum voltage value of the signal. The clipping part comprises a maximum voltage generating system(320) and a clipping member(310). The maximum voltage generating system produces the signal maximum voltage value. The clipping member clips the signal referring to the maximum voltage value generated in the maximum voltage generating system.