| 崔丽娟,高文华,杨亦春,刘相龙,冯浩楠.一种用于高压输气管道泄漏检测的次声传感器的研究[J].,2013,32(2):144-151 |
| 一种用于高压输气管道泄漏检测的次声传感器的研究 |
| An infrasonic sensor for high pressure gas pipeline leakage detection |
| 投稿时间：2012-09-14 |
| 中文摘要: |
| 研究了一种用于检测高压输气管道泄漏次声波的次声传感器。针对管道泄漏频带宽，频率低的特点，该次声传感器换能元件选用电容式传声器，设计了一个前端耐压壳，将前端敏感单元与前置放大器隔离，可耐12 MPa静态压力；通过对比信号放大电路，实现了对调制电路优化设计，使得在1 Hz以下频段仍有较高灵敏度，传感器自噪声降低；该传感器只对声波敏感，对振动的灵敏度平均值1 mV/g，具有很好的抗振动干扰性能。测试结果表明：该传感器能有效地检测到声波信号，频率响应范围0.5 Hz至300 Hz，覆盖了管道泄漏次声频带和低频可听声频段，不放大的Ⅰ档灵敏度200 mV/Pa，Ⅱ档和Ⅲ档分别将信号放大5倍和20倍，输出信号的自噪声小于15 mV，该传感器可适用于天然气输气管道的泄漏监测。 |
| 英文摘要: |
| A new infrasonic sensor is studied in this paper, which can be used to detect noise caused by gas pipe leakage, particularly developed for high pressure gas pipeline monitoring. In allusion to the characteristics of wide frequency bandwidth and low frequency, its sensitive element is a kind of condenser microphone. The front sensing unit is isolated from the preamplifier under a 12 MPa withstand static pressure. By comparing properties of different signal amplifier circuits, one optimization design has been developed, in order to obtain a high sensitivity under 1Hz, and reduce the sensor’s self-noise. The sensor is only sensitive to sound wave and has good anti-interference performance of vibration (vibration sensitivity on average is 1 mV/g).The test result shows that:this infrasound sensor can effectively detect the acoustic signals; the frequency band is from 0.5 Hz to 300 Hz, covering infrasonic frequency and low frequency audio range normally generated by pipeline leakage. The sensitivity to sound wave is about 200 mV/Pa when at positionⅠ (not amplifying ), position II and position III indicate 5 times and 20 times amplifying respectively. The whole noise from the output point is less than 15 mV. The sensor can be applied in natural gas & oil-gas pipeline leakage monitoring. |
| DOI：10.11684/j.issn.1000-310X.2013.02.009 |
| 中文关键词: 次声传感器，气体管道泄漏 |
| 英文关键词: Infrasonic sensor, Gas pipeline leakage |
| 基金项目:国家自然科学基金面上项目(11074278, 11174320)资助 |
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