Monitoring System of Multiple Dangerous Gases Based on Absorption Spectrum Remote Sensing Technology

Abstract

The invention provides a monitoring system for various dangerous gases based on absorption spectrum remote sensing technology, including an air system and a ground system, the air system includes an aircraft platform and a laser radar module mounted on the aircraft platform; the laser radar module includes : Laser emission sub-module, laser echo receiving sub-module, gas concentration self-calibration sub-module. The invention can detect multiple dangerous gases at the same time, and can determine the concentration of various dangerous gases. It can be carried by an aircraft and can work in the air far away from the ground, so as to realize the measurement and positioning of the safe distance of the leakage source of dangerous gases and the diffusion of dangerous gases, etc. The reverse tracking function accurately depicts the real-time distribution map and diffusion trend map of different dangerous gases at each spatial point on the electronic map in real time.

Description

Technical field [0001] The present invention relates to a method for simultaneously measuring multiple dangerous gases, in particular to a multiple dangerous gas monitoring system based on absorption spectrum remote sensing technology, in particular to a free space multi-component hazardous gas remote (aircraft, (Or unmanned) airborne measurement and backtracking positioning system. Background technique [0002] Classified from the detection principle, the detection methods of gas concentration and type mainly include resistance gas sensor measurement method, ultrasonic technology measurement method, meteorological chromatography measurement method, carrier catalytic combustion method, tracer gas concentration attenuation method, optical interferometry, Spectral absorption gas measurement method. [0003] 1) Resistive gas sensor measurement method: using the characteristic that the resistance value of the resistive gas sensor has a deterministic relationship with the surrounding g...

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Problems solved by technology

[0019] 1. The laser receiving system adopted in the technical solution disclosed in this patent document is a reflective structure composed of a single coaxial aspheric surface. The receiving system is limited by the ability of a single mirror to correct the aberration of a large field of view, and the imaging of a large field of view outside the axis exists. Large astigmatism and coma aberration, so it cannot meet the simultaneous reception of multi-channel laser system ground object targets, so it cannot realize the simultaneous detection of multi-component dangerous gases

This coaxial structure cannot avoid the problem of blocking the center of the laser signal. At least 25% of the energy of the laser echo is lost. The system compensates for the energy by increasing the aperture, but the volume of the instrument increases. In order to achieve the same detection sensitivity, The difficulty of optical design increases; the center of the main mirror in this structure is generally in the form of an opening to realize the collection of laser energy, but there is often the problem of direct stray light in the off-axis field of view, which interferes with normal imaging; large field of view, Fast focal ratio, wide band, without any center blocking Transmissive structure has higher optical efficiency, excellent imaging quality, larger optical tolerance, easy to implement instrument, good anti-vibration performance, and beautiful appearance more compact size

[0020] 2. The scope of application of the technical solution disclosed in this patent document is limited to the detection of the concentration of toxic and flammable gases at production sites and non-production sites, mainly near the ground, and the detection range is limited

[0021] 3. The technical solution disclosed in this patent document does not install an optical filter in front of the detector, and cannot normally complete gas detection under the external field conditions interfered by sunlight

[0022] 4. The technical solution disclosed in this patent document does not have a self-calibration system for the instrument itself. When the temperature and pressure at the detection site change from the temperature and pressure at the time of factory calibration, it is difficult to accurately give the concentration information of various dangerous gases

[0023] 5. The technical solution disclosed in this patent document is limited to on-site detection, and it is difficult to accurately depict the real-time distribution and diffusion trend diagram of different dangerous gases at each spatial point on the electronic map of a large area

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