采用红光激光二极管进行光声检测臭氧。

Photoacoustic detection of ozone with a red laser diode.

机构信息

University of Basel, Department of Chemistry, Klingelbergstrasse 80, 4056, Basel, Switzerland; Department of General Sciences, King Mongkut's Institute of Technology Ladkrabang, Prince of Chumphon Campus, Chumphon, 86160, Thailand.

University of Basel, Department of Chemistry, Klingelbergstrasse 80, 4056, Basel, Switzerland.

出版信息

Talanta. 2021 Feb 1;223(Pt 2):121890. doi: 10.1016/j.talanta.2020.121890. Epub 2020 Nov 14.

DOI:10.1016/j.talanta.2020.121890

PMID:33298253

Abstract

The photoacoustic detection of ozone using the Chappuis band is demonstrated. A visible red laser diode emitting at 638 nm was employed as a light source. The photoacoustic cell consisted of a conventional resonance tube with a MEMS (microelectromechanical systems) microphone placed outside an opening along the tube. A calibration curve for the range from 33 ppmV to 215 ppmV was found to be highly linear with a coefficient of determination (r) of 0.9999, when allowing for different measurement frequencies to account for shifts in the speed of sound due to changes in the gas matrix. The limit of detection was found to be 1.6 ppmV for an optical power of the laser diode of about 130 mW.

摘要

利用 Chappuis 带对臭氧进行光声检测。使用发射波长为 638nm 的可见红色激光二极管作为光源。光声池由一个带有微机电系统 (MEMS) 麦克风的常规共振管组成，麦克风放置在管外的一个开口处。当允许不同的测量频率考虑到由于气体矩阵变化而导致的声速变化时，发现在 33ppmV 至 215ppmV 的范围内，校准曲线具有高度的线性，决定系数 (r) 为 0.9999。检测限被发现为对于激光二极管的光功率约为 130mW 时为 1.6ppmV。