Airborne detecting device for laser remote sensing of gas leakage

Abstract

The invention discloses an airborne detecting device for laser remote sensing of gas leakage. The airborne detecting device comprises an infrared laser transmitting part, an infrared laser receiving part and a controlling and processing part electrically connected with the infrared laser transmitting part and the infrared laser receiving part; particularly, the airborne detecting device is located on an aircraft and also comprises a spiral detecting track part composed of a rotating reflecting mirror (13) arranged on a shaft of a motor (14), wherein the included angle formed by a normal of the rotating reflecting mirror (13) and an axis of the motor (14) is 1-6 DEG, and an angle formed by the normal of the rotating reflecting mirror (13) and an optical axis (12) of the infrared laser transmitting part is 40-50 DEG; and the controlling and processing part comprises a transmitting signal control assembly and a receiving signal processing assembly which are electrically connected, wherein the transmitting signal control assembly is used for realizing modulation for the output of a laser device (5) in the infrared laser transmitting part, and the receiving signal processing assembly is used for calculating the concentration of leaked gases according to the detected signals carrying leakage gas information. The airborne detecting device can be widely applied to precise location and large-area rapid detection for natural gas leakage.

Description

technical field [0001] The invention relates to a laser remote sensing airborne detection device, in particular to a laser remote sensing airborne detection device for gas leakage. Background technique [0002] With the continuous expansion of natural gas consumption, my country has built hundreds of thousands of kilometers of natural gas pipelines. For such a long natural gas pipeline network, leakage is inevitable in the process of natural gas transportation, storage, and sales management, and it is also the main cause of safety accidents. Therefore, in order to find the leakage point in time, people have developed the laser remote sensing detection technology for natural gas leakage. However, when this technology detects natural gas leaks, due to the received scattered light depending on the reflector, the return light power varies greatly, and the demodulated second harmonic signal is proportional to the light intensity, so that the measurement results accuracy is grea...

AI Technical Summary

Problems solved by technology

This detection system and method, which uses the ratio of the residual amplitude of the second harmonic signal to the first harmonic signal to eliminate the influence of light intensity, has achieved some effects, but there are still deficiencies. First, due to the demodulation of the second The harmonic signal and the first harmonic signal use different lock-in amplifiers, and the information such as the phase of the two lock-in amplifiers is not consistent, and the distance of remote sensing detection technology changes in practical applications, which causes the phase to change. There are certain changes, which will cause a large error in eliminating the influence of light intensity fluctuations by using the ratio of the second harmonic signal to the residual amplitude of the first harmonic signal; secondly, the distance that the detection system moves in unit time is limited, Difficult to quickly and efficiently detect leaks in large regional natural gas pipeline networks

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