Fire early-stage multi-component gas laser telemetering device and control method thereof

Abstract

The invention discloses a fire early-stage multi-component gas laser telemetering device and a control method thereof, belongs to the technical field of fire detection, and solves the problems that an air suction type multi-component gas fire detection device is complex in measurement system and slow in response, and a telemetering type fire gas detection device is small in measurement range and few in gas detection types. Multiple paths of same-frequency asynchronous time-sharing low-frequency sawtooth wave signals respectively perform time-sharing scanning on multiple paths of laser wavelengths emitted by multiple DFB lasers; the same high-frequency sine wave modulation signal multi-path laser wavelength is modulated to a corresponding central absorption line of each gas in the multi-component gas; after modulation, multiple paths of laser are combined into one laser beam through an optical fiber coupler, echo signal light after collimation emission is input into an ARM embedded acquisition control analysis module for detection and demodulation to obtain a second harmonic signal of each gas in a scanning period, and then processing is performed according to the second harmonic signal of each gas so as to realize simultaneous online detection of the multi-component gas, and the device is high in response speed, small in size, compact in structure and long in detection distance.

Description

technical field [0001] The invention belongs to the technical field of fire detection, and relates to a multi-component gas laser telemetry device in the early stage of a fire and a control method thereof. Background technique [0002] At present, in the field of fire early warning and detection, the widely used fire detector is a typical point-type smoke detector. Due to the optical labyrinth structure of this detector, it is easy to miss false alarms, and the detection sensitivity is low, the precision is low, and the response is slow. The detection range is small. In addition, the detector needs fire smoke to form a ceiling jet for contact detection and alarm. However, due to the thermal barrier effect, the ceiling jet of fire smoke cannot reach the smoke detector in a high space. [0003] The development trend of fire detectors in the future is to realize early warning, so the research and development of early fire alarm technology is of great significance. The main guid...

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Problems solved by technology

[0007] The purpose of the present invention is how to design a small-sized, compact structure, and long detection distance multi-component gas laser telemetry device and control method in the early stage of fire, so as to solve the problem that the traditional air-breathing multi-component gas fire detection device has a complicated measurement system. , slow response, and the existing telemetry fire gas detection device has a small measurement range and few types of gas detection

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