Low-cost NO2 trace concentration measuring device using a broadband diode laser and a customized cavity

A low-cost NO2 trace concentration measuring device based on a cavity ring-down spectroscopy (CRDS) technique is presented. We theoretically and experimentally demonstrate that, if the nonresonant direct reflection is effectively isolated, an inexpensive broadband diode laser (LD) can excite multipl...

Full description

Saved in:
Bibliographic Details
Published in:Optical engineering 2022-12, Vol.61 (12), p.124111-124111
Main Authors: Cheng, Chonghui, Hu, Pengbing, Liu, Sumei, Qi, Haiyang, Chen, Zhemin, Pan, Sunqiang
Format: Article
Language:English
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A low-cost NO2 trace concentration measuring device based on a cavity ring-down spectroscopy (CRDS) technique is presented. We theoretically and experimentally demonstrate that, if the nonresonant direct reflection is effectively isolated, an inexpensive broadband diode laser (LD) can excite multiple cavity modes and stabilize the cavity output signal with an optical feedback (OF) method. To improve the measuring accuracy for low concentrations of NO2 gases, we also design and machine a cavity with several mixing rooms. Several standard concentrations NO2 gases are used to test the apparatus. The results prove a great agreement between measured and theoretical values over the full range.
ISSN:0091-3286
1560-2303
DOI:10.1117/1.OE.61.12.124111