A Natural Gas Leakage Telemetry LiDAR

Abstract

The invention relates to a natural gas leakage telemetering laser radar used for remote laser telemetering. The natural gas leakage telemetering laser radar can timely find pipeline leakage points and diffusion range and reduce loss caused by leakage. The technical scheme includes that a specially-designed wide-spectrum mid-infrared laser device is mounted on a radar platform, and range of spectra emitted by the laser device is 3.2-3.4 micrometers; laser spectra are measured by adopting a mid-infrared spectrograph before laser is emitted through an emitting antenna, the laser going through the emitting antenna goes through leaking gas cloud cluster and then is reflected by pipelines, soil or seawater, reflected laser is received by a receiving antenna, the mid-infrared spectrograph measures spectra of the received laser, and leakage condition of methane gas is judged by comparing absorbing condition of the spectra, of the laser before being emitted and after being received, at a position with the spectrum of 3.31 micrometer. Compared with a methane gas detecting device adopting continuous laser of 1.65 micrometer, the natural gas leakage telemetering laser radar has the advantages of longer detecting distance, higher system sensitivity and capability of being used for patrolling natural gas pipelines and submarine natural gas leakage.

Description

technical field [0001] The invention relates to a natural gas leakage remote measurement laser radar for long-distance laser remote measurement, which belongs to a natural gas leakage detection device. Background technique [0002] At present, my country has built about 100,000 kilometers of oil and gas pipelines, and the total mileage will exceed 150,000 kilometers by 2020, of which about 1 / 3 are natural gas pipelines. It has formed an oil and gas pipeline network pattern that spans east and west, runs north and south, and connects overseas, and has become an energy artery that promotes China's economic development and benefits people's livelihood. Compared with the transportation of liquefied natural gas on the ground known as "flowing bombs", pipelines have become the safest and most environmentally friendly option. However, natural gas pipelines are not absolutely safe. Because natural gas pipelines are located in the wild with harsh natural environments, they are damag...

AI Technical Summary

Problems solved by technology

Due to the large distribution area and long distance of the natural gas pipeline network, relying on manual monitoring of leakage along the pipeline will consume huge manpower and material resources

The traditional methane telemetry radar uses a continuous laser in the 1.65um band as the light source. The low power of the laser cannot realize long-distance methane telemetry. In addition, the absorption coefficient of methane to the 1.65um laser is two orders of magnitude lower than that of the 3.31um laser, which leads to the use of 1.65um The methane detection device with a um laser has low sensitivity and cannot be applied to large-area telemetry in similar pipelines and sea level environments. However, the natural gas leakage laser telemetry radar system using mid-infrared band lasers can patrol and detect natural gas pipelines at long distances and find leaks in time. Protect personal safety and property safety around the pipeline

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