Laser trace vacuum pipeline gas detection device and method based on photoacoustic spectroscopy

Abstract

The invention discloses a laser trace vacuum pipeline gas detection device based on photoacoustic spectrometry, which comprises a plurality of detection units arranged on the inner wall of a pipeline, and each detection unit comprises a laser and a sound wave detector which are correspondingly arranged; each sound wave detector is provided with a unique coding label corresponding to the position of the sound wave detector in the pipeline; the laser comprises a laser emitter and an optical chopper; the laser and the sound wave detector are connected with the control center through a signal line arranged along the inner wall of the vacuum pipeline; and the invention further discloses a detection method of the laser trace vacuum pipeline gas detection device based on the photoacoustic spectrum, real-time online monitoring is achieved, the gas leakage position and the abnormal gas gathering position are accurately judged, the detection sensitivity is high, the response time is short, the detection cost is reduced, normal running of a vehicle is not affected, and the vacuum environment in the pipeline is not damaged.

Description

technical field [0001] The invention belongs to the technical field of vacuum pipeline transportation and vacuum leak detection, in particular to a laser trace vacuum pipeline gas detection device and method based on photoacoustic spectroscopy. Background technique [0002] For high-speed rail and maglev trains, when the speed exceeds 300km / h, the air resistance becomes the main running resistance. When the speed exceeds 350km / h, the air resistance reaches more than 85% of the total running resistance of the train. To increase speed further, aerodynamic drag must be reduced. The existing trains have effectively reduced the aerodynamic drag by optimizing the vehicle profile (such as streamlined front and rear). However, the application of this method to reduce aerodynamic drag is close to its potential limit. In order to allow the train to reach a high speed of more than 600km / h, a feasible and effective method is to build a pipeline on the ground or underground, evacuate a ...

AI Technical Summary

Problems solved by technology

[0009] The radioactive isotope gas method and helium mass spectrometry leak detection method are only suitable for leak detection in laboratories and small vacuum equipment, and are not suitable for gas detection and pipeline leak detection in vacuum pipeline transportation.

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