Pocket-Sized Nondispersive Infrared Methane Detection Device Using Two-Parameter Temperature Compensation

ABSTRACT With the correction on Beer–Lambert law, a low-cost, low-power, and miniaturization methane detection device is reported by using a two-parameter temperature compensation method. The adopted methane sensor contains a midinfrared light source, an optical path, and a midinfrared dual-channel detector. Control and processing circuits are developed to extract gas concentration, and experiments are carried out to derive detection performances. Two characteristic parameters of the device are achieved through calibration, and their relations with temperature are obtained for accurate compensation. The device is powered by batteries with a total current less than 100 mA, and the power consumption is less than 0.6 W. Both the sensitivity and the minimum detection limit under low concentration range can reach to 50 parts per million. The device also reveals high stability owing to the compensation on temperature variation. Compared with the preexisting wall-mounted devices, this device does well meeting th...