一个中红外量子级联激光超敏感的痕迹形式甲检测系统,基于改进的双频多通气体电池
Tao Wu1,2, Renzhi Hu1, Pinhua Xie1,2,3
1Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
Sensors (Basel, Switzerland)
|July 8, 2023
概括
一个新的量子级联激光 (QCL) 系统有效地检测到28万亿分之一的微量甲 (HCHO). 这种先进的仪器显示出高精度和稳定性,可用于长期大气监测.
科学领域:
- 大气化学 大气化学
- 环境监测 环境监测
- 频谱学是一种光谱学.
背景情况:
- 甲 (HCHO) 是挥发性有机化合物 (VOC) 的关键标记物.
- 最近的VOC排放量减少需要更敏感的HCHO检测方法.
- 追踪HCHO监测需要高精度的分析仪器.
研究的目的:
- 开发和验证一种微量甲 (HCHO) 敏感检测系统.
- 为了改善吸收光学拼接长度,以提高气体检测.
- 评估仪器在现场条件下的性能及其与现有技术的相关性.
主要方法:
- 使用了一种量子级联激光器 (QCL),激发波长为5.68μm.
- 采用了改进的双发射多通道电池,以实现67米的有效吸收光学带宽.
- 测试了来自常见大气气体和湿度变化的交叉干扰.
主要成果:
- 实现了28个每万亿体积分 (pptv) 的检测灵敏度,响应时间为40秒.
- 证明其他大气气体和湿度的干扰最小.
- 现场部署显示了与商业腔环下光谱仪器的良好相关性 (R2 = 0.967).
结论:
- 开发的基于QCL的系统为微量HCHO检测提供了高灵敏度和选择性.
- 该仪器能够抵御常见的大气干扰和湿度.
- 该系统适用于长期,无人监控的环境HCHO.监测.
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