在现场高精度测量深海溶解甲,采用石增强的光声学和光诱导的热弹性光谱学
Hao Liu1,2, Xiang Chen1, Mai Hu1,3
1Hefei Institute of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
Analytical chemistry
|July 24, 2024
概括
一个新的传感器使用光声学和光诱导热弹性光谱学准确地测量深海中溶解的甲. 这一创新有助于生态地质学,资源勘探和气候变化研究.
科学领域:
- 地质化学和海洋学
- 环境监测 环境监测
- 传感器技术 传感器技术
背景情况:
- 深海溶解气体的现场分析对于生态地质学,资源勘探和气候变化研究至关重要.
- 现有的溶解气体分析方法往往缺乏深海环境所需的速度,精度或现场能力.
- 甲 (CH4) 是一个关键的温室气体和地质过程的指标,使其精确的测量至关重要.
研究的目的:
- 开发和验证一种新的现场传感器,用于准确和快速地测量深海溶解甲.
- 整合先进的光谱技术,以提高灵敏度和自我校正能力.
- 为了证明传感器在现实世界深海部署中的性能和适用性.
主要方法:
- 使用石英增强的光声谱学 (QEPAS) 和带光热弹性光谱学 (LITES) 与频率分割复杂化.
- 设计了一个紧的传感器系统 (φ120毫米×430毫米,7.6瓦的功耗) 与一个小的光声学电池 (1.2毫升).
- 在不同的压力和温度条件下对CH4度 (0.015%) 校准了传感器的光谱响应,并研究了水蒸气的影响.
主要成果:
- 基于几个小时的艾伦方差分析,甲的最低检测极限为0.21 ppm.
- 由于紧的光声细胞,证明了4分钟的快速响应时间来检测溶解的甲.
- 在南海1380米处成功部署传感器系统,在"海马"冷附近收集了三天的连续溶解甲数据.
结论:
- 开发的基于QEPAS和LITES的传感器为现场深海溶解甲监测提供了强大而准确的解决方案.
- 传感器的紧设计,低功耗和快速响应时间使其适用于自动驾驶海洋应用.
- 成功的现场部署验证了传感器提供有价值数据的能力,以了解深海生态系统和地质过程.
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