Patent ID: 8381587
Filing Date: 2013-02-26
Classification: G01N

Abstract:
1. A gas sensor comprising: a gas detection device containing a dielectric semiconductor, the electric conductivity of the gas detection device varying in response to the degree of adsorption of gases to the gas detection device; a capacitive element connected in series to the gas detection device, the capacitance of the capacitive element being larger than the capacitance of the gas detection device; and a pair of electrodes which are connected to electric terminals of an electric element comprising the gas detection device and the capacitive element, wherein the gas sensor is capable of detecting the degree of adsorption of gases to the gas detection device from an electrical response changing in response to a voltage which is applied to the pair of electrodes and which periodically varies and reverses in polarity, wherein the gas sensor comprises a pair of inert metal layers each formed directly on the surface of one of the electric terminals of the gas detection device, and wherein the gas detection device and the pair of inert metal layers sandwiching the gas detection device forms a gas detection module which does not substantially contain an electric element which has dielectric characteristics other than the gas detection device.