基于载波调制和特征识别的光纤地震数据采集系统自检技术

Self-checking Technology of Optical Fiber Seismic Data Acquisition System based on Carrier Modulation and Feature Recognition

提出一种基于载波调制和特征识别的光纤地震数据采集系统自检技术,可以对光纤检波器阵列中的光纤检波器进行通断自检,并对地震数据采集系统的信号拾取功能进行自检。由于光纤检波器阵列中的光纤检波器在有回光和没有回光的情况下,地震数据采集软件接收到的信号存在显著差异,因此,在采集软件中通过特征识别的方法可以对光纤检波器有无回光进行通断自检。通过在高频载波中携带震动信号频段的调制信号,观察光纤解调器的解调输出结果,可以实现对光纤地震数据采集系统的信号拾取功能的自检。基于载波调制和特征识别的自检技术可以解决目前光纤地震数据采集系统缺乏有效自检技术的问题。

In this paper,the self-checking technology for fiber-optic seismic data acquisition system based on carrier modulation and feature recognition is proposed.It can perform self-checking for on-off status of the fiber-optic geophones in the geophone array and signal pickup function of the seismic data acquisition system.Since the signals received by the seismic data acquisition software are significantly different when the light path is on status or off status,the method of feature recognition in the acquisition software can determine whether or not there are return light from the geophone.By carrying the signal of the vibration frequency band in the high frequency carrier and observing the demodulation result of the optical fiber demodulator,the self-checking of the signal pickup function of the seismic data acquisition system can be realized.The self-checking technology based on carrier modulation and feature recognition can solve the problem of lack of effective self-checking method in current optical fiber seismic data acquisition system.