Mini-distributed acoustic sensing module for submarine application
Author(s): Xu, TW (Xu, Tuanwei); Ma, LL (Ma, Lilong); Yang, KH (Yang, Kaiheng); Li, F (Li, Fang)
Source: OPTICAL ENGINEERING Volume: 60 Issue: 3 Article Number: 034106 DOI: 10.1117/1.OE.60.3.034106 Published: MAR 2021
Abstract: 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 x 300 x 110 mm(3) (width x depth x height), and the power consumption is down to 25 W. The spatial sampling resolution of similar to 0.8 m is 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 x 10(-4) rad/root Hz and the minimum detectable strain is 10.4 p epsilon/root Hz. The innovative mini-DAS module has high enough capabilities for real-time seismic wave signal detection in deep sea. (C) 2021 Society of Photo Optical Instrumentation Engineers (SPIE)
Accession Number: WOS:000644402200026
ISSN: 0091-3286
eISSN: 1560-2303
