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Mini-distributed acoustic sensing module for submarine application

机译：Mini-distributed acoustic sensing module for submarine application

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摘要

High-resolution submarine seismic survey techniques have become necessary in many actual geological and geophysical investigations. A new type of mini-distributed acoustic sensing (DAS) module is developed for working at the bottom of the sea with several kilometers long single-mode fiber cable for tens of thousands of channels at the same time. Integrated designs of optics and electrics help to significantly reduce volume and power consumption. Compared with a common land-based DAS system, the size and power consumption of the mini-DAS module are significantly optimized. The size is 150 × 300 × 110 mm~3 (width × depth × height), and the power consumption is down to 25W. The spatial sampling resolution of ～0.8 mis retained for high-resolution seismic profile in the deep sea survey. The upper limit of response frequency is set by 500 Hz for the channel sample rate of 1 kS/s to realize the long-term data storage. It presents a powerful signal acquisition ability with the average system noise of 4.79 × 10~(-4) rad/√Hz and the minimum detectable strain is 10.4 pε/√Hz. The innovative mini-DAS module has high enough capabilities for real-time seismic wave signal detection in deep sea.

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