Forward measurement of submarine gas hydrates by active remote sensing technology

Yuan-he TANG; Hao-xuan WANG; Qing-song LIU; Cun-xia LI; Tao YU

doi:10.3788/OPE.20182612.2909

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Forward measurement of submarine gas hydrates by active remote sensing technology

Modern Applied Optics | 更新时间：2020-07-05

- Forward measurement of submarine gas hydrates by active remote sensing technology
- Optics and Precision Engineering Vol. 26, Issue 12, Pages: 2909-2916(2018)
- 作者机构：
  
  1.西安理工大学理学院物理系，陕西西安 710048
  2.中国科学院西安光学精密机械研究所，陕西西安 710119
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20182612.2909
  CLC： TP79
- Received：21 June 2018，
  
  Accepted：15 July 2018，
  
  Published：25 December 2018
- 稿件说明：
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Yuan-he TANG, Hao-xuan WANG, Qing-song LIU, et al. Forward measurement of submarine gas hydrates by active remote sensing technology[J]. Optics and precision engineering, 2018, 26(12): 2909-2916.
DOI：

Yuan-he TANG, Hao-xuan WANG, Qing-song LIU, et al. Forward measurement of submarine gas hydrates by active remote sensing technology[J]. Optics and precision engineering, 2018, 26(12): 2909-2916. DOI： 10.3788/OPE.20182612.2909.

摘要

本文提出利用光学成像干涉技术主动遥感探测可燃冰的温度、压强、浓度物理量。通过光纤将海面上波长为1.65

m的激光传输到海底，激发海底可燃冰，将CH

发射的1.65

m附近相距很近的10条谱线用光纤收集传回到海面上，经过成像干涉系统，在CCD相机上得到5条成像干涉条纹，选择两条相邻干涉条纹的灰度值，利用“转动谱线测温法”和洛伦兹线型即可获得海底可燃冰CH

的温度、压强、浓度等参量。实验得出CH

的正演成像干涉图，并得到CCD上的电子计数1.68×10

远远大于拟用CCD噪声400e，系统的最大信噪比为291，窄带干涉滤光片可在16°视场内区分CH

的10条目标谱线，CH

的温度和浓度探测精度分别为1 K和3%。研究表明，该成像干涉系统可用于遥感探测海底可燃冰。

Abstract

In this paper

an optical imaging interferometry system was proposed for the accurate detection of the temperature

pressure

and concentration of gas hydrates. As part of this system

laser light with a wavelength of 1.65

was transmitted across the sea surface through a fiber to excite gas hydrates on the sea bed. Ten spectral lines close to the 1.65

m waves emitted by CH

were collected and transmitted to the sea surface through another fiber. Five image interference fringes for CH

were obtained on a Charge-Coupled Device (CCD) camera. Using the "rotation line temperature measurement method" and the Lorentzian line profile

and by selecting the gray values of two adjacent interference fringes

the temperature

pressure

and concentration of the CH

gas hydrates on the sea bed could be obtained. The forward results of the imaging interferogram for CH

show that the electron count on the CCD is 1.68×10

much larger than which results in the noise value of 400e. The maximum signal-to-noise ratio of the system is 291. The narrowband interference filter could distinguish 10 spectral lines in the waves emitted by CH

within the 16° field of view. The measuring precision of the CH

temperature and concentration values are 1 K and 3%

respectively. This study shows that an imaging interference system can be used in the remote sensing of seabed gas hydrates.

关键词

Keywords

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