Infrasound and low-frequency sound sensor for monitoring fluid leakage in high-pressure pipeline

Abstract

The invention relates to an infrasound and low-frequency sound sensor for monitoring fluid leakage in a high-pressure pipeline. The infrasound and low-frequency sound sensor adopts a capacitive sensor with pressure-equalizingbalanced holes, the capacitive sensor is arranged in a pressure-tight front cavity through a sensor base, a high-pressure environment is formed between the pressure-tight front cavity and the sensor base which is provided with the pressure-equalizing holes so that the capacitive sensor works in the pressure-equalizing environment, the pressure-tight front cavity is provided with a sound inlet, and a gas filter or a sound-transmitting isolatorseparator is filled between the sound inlet and the capacitive sensor. When a high-pressure gas pipeline is detected for leakage, the gas filter is filled at the sound inlet of the pressure-tight front cavity. When a high-pressure liquid pipeline is detected for leakage, the sound-transmitting isolatorseparator is filled at the sound inlet of the pressure-tight front cavity, and the interior of the pressure-tight front cavity is filled with a sound-transmitting liquid. A signal conductor is hermetically penetrateds through the sensor base to output a signal generated by a capacitor microphone through the signal conductor.

Description

technical field [0001] The present invention relates to infrasonic wave and low-frequency sound wave measuring sensor, in particular, the present invention relates to a kind of infrasound and low-frequency sound sensor used for fluid leakage monitoring in high-pressure pipeline, to detect the infrasonic wave produced when fluid leakage in high-pressure gas and liquid pipeline and low frequency sound waves. Background technique [0002] Natural gas or oil pipelines are leaked due to corrosion, internal defects, or sudden natural disasters (such as earthquakes, landslides, river impacts) and man-made damage, resulting in huge economic losses and threats to normal production and life. Therefore, it is very important to use sensors to detect pipeline leakage, which can save a lot of manpower and material resources for early detection of accident locations. When the fluid in the high-pressure gas and liquid pipeline leaks, the leakage signal it sends out is very different from ...

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Problems solved by technology

[0005] The above-mentioned patents have made innovations in the composition of the sound wave monitoring system and the positioning method, but there is no breakthrough in the sensor, and the sensor used is not specially designed for low-frequency signals with leakage characteristics

[0006] In view of the high-pressure working environment in the high-pressure pipeline, the existing capacitive sensors cannot be simply used directly. At present, piezoelectric sensors are widely used. The working principle of this sensor is to use quartz, potassium sodium tartrate and ammonium dihydrogen phosphate to Electrical materials are sensitive to leakage signals and convert them into electrical signals for measurement. However, they have low sensitivity to infrasound and low-frequency acoustic responses, cannot accurately capture infrasound and low-frequency acoustic signals generated during leakage, and cannot overcome high static pressure There is also a silicon piezoresistive pressure sensor, which uses the silicon piezoresistive principle. This sensor can capture infrasound and low-frequency sound signals when leaking, but it cannot overcome the influence of high static pressure, and because silicon The piezoresistive pressure sensor is a physical property sensor based on silicon material. The silicon material is greatly affected by the ambient temperature, which will cause a large zero temperature drift and sensitivity temperature drift, which is very unfavorable for improving the stability of the device.

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