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10 October 2020 A novel mini-DAS module for submarine application
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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 channels at the same time. Integrated designs of optics and electrics help to significantly reduce volume and power consumption. Compared with common Land-based DAS system, the size and power consumption of the mini-DAS module are significantly optimized. The size is 150mm x 300mm x 110mm (Width x Length x Height), and the power consumption is down to 25W. The spatial sampling resolution of ~0.8m is retained for high resolution seismic profile in the deep sea survey. The upper limit of response frequency is set by 500Hz for the channel sample rate of 1000S/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 10.4pε/√Hz. The novel mini-DAS module has high enough capabilities for real-time seismic wave signal detection in deep sea.
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Tuanwei Xu, Lilong Ma, Kaiheng Yang, and Fang Li "A novel mini-DAS module for submarine application", Proc. SPIE 11554, Advanced Sensor Systems and Applications X, 115541A (10 October 2020);

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