Abstract: An ultra-low power consumption laser-based wireless methane monitoring system based on a pulse-driven vertical-cavity surface-emitting laser (VCSEL), wherein when the system is in a normal operation, a microcontroller unit (MCU): automatically wakes up a corresponding laser-based methane node detection device to measure ambient temperature; according to measured different ambient temperature values, performs detection of methane concentration by controlling wavelength of laser beam emitted by VCSEL light source chip to be scanned at different absorption peak wavelengths; and judges methane concentration value is in a preset safety range or not; wherein, if yes, switches the corresponding device to sleep and wakes it up when a preset sleep period ends, to detect methane concentration again; and, if the methane concentration value is always within the preset safety range, the device continuously operates alternately and repeatedly between “wake-up” and “sleep” modes; if not, makes an alarm prompt and uploads me

Abstract: A two-dimensional multi-point-reflection long-optical-path gas sensor probe includes: a protecting housing and a multi-point total reflection type long-optical-path module arranged in the protecting housing. The multi-point total reflection type long-optical-path module includes two right-angle reflecting prisms or mirror pairs spaced at a set distance, and inclined surfaces of the right-angle reflecting prisms or mirror pairs are oppositely arranged and parallel to each other. A set deviation exists between center lines of the two right-angle reflecting prisms or mirror pairs, and the deviation can enable light beams parallel to the center lines to be reflected for a set number of times between the two right-angle reflecting prism or mirror pairs, so as to form a two-dimensional parallel light beam group. Thereby increasing a measurement optical path of gas absorption, which is beneficial to improve the detection signal-to-noise ratio and the measurement accuracy.

Abstract: A two-dimensional multi-point-reflection long-optical-path gas sensor probe includes: a protecting housing and a multi-point total reflection type long-optical-path module arranged in the protecting housing. The multi-point total reflection type long-optical-path module includes two right-angle reflecting prisms or mirror pairs spaced at a set distance, and inclined surfaces of the right-angle reflecting prisms or mirror pairs are oppositely arranged and parallel to each other. A set deviation exists between center lines of the two right-angle reflecting prisms or mirror pairs, and the deviation can enable light beams parallel to the center lines to be reflected for a set number of times between the two right-angle reflecting prism or mirror pairs, so as to form a two-dimensional parallel light beam group. Thereby increasing a measurement optical path of gas absorption, which is beneficial to improve the detection signal-to-noise ratio and the measurement accuracy.