Laser-based wireless methane monitoring system based on pulse-driven vertical-cavity surface-emitting laser and monitoring method thereof

A laser-based wireless methane monitoring system based on a pulse-driven vertical-cavity surface-emitting laser (VCSEL), comprising:

• a group of laser-based methane node detection devices powered by batteries, wherein each of the laser-based methane node detection devices comprises a pulse-driven VCSEL-based methane detection module, and the pulse-driven VCSEL-based methane detection module comprises a microcontroller unit (MCU) control module;
• wherein,
• the MCU control module is configure to:
• automatically wake up a corresponding pulse-driven VCSEL-based methane detection module when the laser-based wireless methane monitoring system is in a normal operation, receive a measured ambient temperature at a current moment,
• according to the received different ambient temperature, control a drive current of a VCSEL light source chip, so that a wavelength of a laser beam emitted by the VCSEL light source chip is scanned at different absorption peak wavelengths, to carry out a measurement to methane concentration,
• perform an inversion calculation based on a calibration value to obtain a value of the methane concentration, and
• judge whether the obtained value of the methane concentration is within a preset safety range, which comprises:
• if yes, to switch a state of the corresponding pulse-driven VCSEL-based methane detection module to a “sleep” mode until the end of a preset sleep period, wake up the corresponding pulse-driven VCSEL-based methane detection module once again to perform the detection of the methane concentration;
• and, if the obtained value of the methane concentration through the detection is always within the preset safety range, to control the pulse-driven VCSEL-based methane detection module to continuously operate alternately and repeatedly in a “wake-up” mode and the “sleep” mode;
• if not, which indicates that the obtained value of the methane concentration exceeds the preset safety range, to send out an alarm prompt information.