使用紧凑型光纤耦合法布里-珀罗干涉仪对一氧化氮进行强度调制光热测量。

Intensity Modulated Photothermal Measurements of NO with a Compact Fiber-Coupled Fabry-Pérot Interferometer.

作者信息

Breitegger Philipp, Lang Benjamin, Bergmann Alexander

机构信息

Institute of Electronic Sensor Systems, Graz University of Technology, Graz 8010, Austria.

出版信息

Sensors (Basel). 2019 Jul 30;19(15):3341. doi: 10.3390/s19153341.

DOI:10.3390/s19153341

PMID:31366101

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6696406/

Abstract

Sensors for the reliable measurement of nitrogen dioxide concentrations are of high interest due the adverse health effects of this pollutant. This work employs photothermal spectroscopy to measure nitrogen dioxide concentrations at the parts per billion level. Absorption induced temperature changes are detected by means of a fiber-coupled Fabry-Pérot interferometer. The small size of the interferometer enables small detection volumes, paving the way for miniaturized sensing concepts as well as fast response times, demonstrated down to 3 s. A normalized noise equivalent absorption of 7.5 × 10 - 8 cmW/ Hz is achieved. Additionally, due to the rigid structure of the interferometer, the sensitivity to mechanical vibrations is shown to be minor.

摘要

由于二氧化氮这种污染物对健康有不利影响，能够可靠测量其浓度的传感器备受关注。这项工作采用光热光谱法来测量十亿分之一水平的二氧化氮浓度。通过光纤耦合法布里 - 珀罗干涉仪检测吸收引起的温度变化。干涉仪体积小，可实现小检测体积，为小型化传感概念以及快速响应时间（已证明低至3秒）铺平了道路。实现了7.5×10 - 8 cmW/Hz的归一化噪声等效吸收。此外，由于干涉仪结构坚固，其对机械振动的敏感度较低。