| Autor: |
Lilong Ma, Kaiheng Yang, Tuanwei Xu, Fang Li |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Optical Engineering. 60 |
| ISSN: |
0091-3286 |
| DOI: |
10.1117/1.oe.60.3.034106 |
| Popis: |
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 mm3 (width × depth × height), and the power consumption is down to 25 W. The spatial sampling resolution of ∼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 × 10 − 4 rad / √Hz and the minimum detectable strain is 10.4 pe / √Hz. The innovative mini-DAS module has high enough capabilities for real-time seismic wave signal detection in deep sea. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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