用连续波光量子级联激光器进行一氧化氮的光腔衰荡光谱检测。

Cavity ringdown spectroscopic detection of nitric oxide with a continuous-wave quantum-cascade laser.

作者信息

Kosterev A A, Malinovsky A L, Tittel F K, Gmachl C, Capasso F, Sivco D L, Baillargeon J N, Hutchinson A L, Cho A Y

出版信息

Appl Opt. 2001 Oct 20;40(30):5522-9. doi: 10.1364/ao.40.005522.

DOI:10.1364/ao.40.005522

Abstract

A spectroscopic gas sensor for nitric oxide (NO) detection based on a cavity ringdown technique was designed and evaluated. A cw quantum-cascade distributed-feedback laser operating at 5.2 mum was used as a tunable single-frequency light source. Both laser-frequency tuning and abrupt interruptions of the laser radiation were performed through manipulation of the laser current. A single ringdown event sensitivity to absorption of 2.2 x 10(-8) cm(-1) was achieved. Measurements of parts per billion (ppb) NO concentrations in N(2) with a 0.7-ppb standard error for a data collection time of 8 s have been performed. Future improvements are discussed that would allow quantification of NO in human breath.

摘要

设计并评估了一种基于光腔衰荡技术的用于检测一氧化氮（NO）的光谱气体传感器。使用了一台工作在5.2微米的连续波光量子级联分布反馈激光器作为可调谐单频光源。通过对激光电流的操控来实现激光频率调谐和激光辐射的突然中断。实现了单次衰荡事件对吸收的灵敏度为2.2×10⁻⁸厘米⁻¹。在8秒的数据采集时间内，对氮气中十亿分之一（ppb）浓度的NO进行了测量，标准误差为0.7 ppb。讨论了未来的改进措施，这些措施将能够对人体呼出气体中的NO进行定量分析。