基于生产者-消费者程序结构的振动传感系统

低频振动常伴随自然灾害的发生,低频振动信号的实时准确检测对海底地震监测及海啸预警等领域的灾害探测具有重大意义,光纤振动传感器是实现低频信号检测的有效方式.设计了一类光纤振动信号传感系统的传感光路及相位解调单元,采用基于迈克尔逊干涉仪结构的顺变柱体传感检波器实现对传感系统中振动信号的转换和探测.针对光纤式低频振动信号传感系统的信号处理高实时性和高信噪比的难题,提出在信号解调处理单元引入LabVIEW的生产者-消费者程序结构模式,极大提高程序并行运算速率并有效释放上位机内存压力.经过系统整体联调测试实验验证,系统对0.01～1 Hz的超低频振动信号有高信噪比的输出,同时为光纤振动传感技术在低频频段研究工作提供参考.

A vibration sensing system based on producer-consumer program structure

The vibration detection with low frequency is of great significance for subsea seismic monitoring and tsunami warning. Optical fiber vibration sensor is an effective way to solve it. This paper develops a fiber-optic vibration sensing system, which consists of a sensing optical path and phase demodulation unit. A new fiber-optic interference vibration detection method is presented by using the variable-column sensing sensor based on the Michelson interferometer structure. Until now, limiting factors for the implementation of fiber-optic vibration sensing system in disaster detection, such as subsea seismic monitoring and tsunami warning, which is associated with the comparatively poor operation speed and signal-to-noise ratio. To overcome these constraints, this paper employs the LabVIEW producer-consumer program structure mode for the signal demodulation processing unit, which significantly increases the parallel operation rate of the program and effectively releases the memory pressure of the upper monitor. Experimental results demonstrate that the system succeed with high signal-to-noise ratio output for the low frequency vibration signal of 0.01~1 Hz. This paper may provide reference for the research work of the fiber vibration sensing technology for low frequency band.