增强吸收光谱技术的研究进展及展望

Development and prospects of enhanced absorption spectroscopy

光程吸收光谱技术是吸收光谱技术发展中的一个重要分支,近年来基于不同光源技术、吸收腔技术、探测方式的光程吸收光谱技术大量涌现。随着对探测灵敏度和吸收光程长度需求的提高,出现了基于增强吸收原理的光程吸收光谱技术,包括:积分腔光谱(ICOS)、腔增强吸收光谱(CEAS)和腔衰荡光谱(CRDS)。增强吸收光谱技术具有高光谱分辨率、高灵敏度、快速响应、便携等优势,但至今缺乏统一的概念和明确的分类依据。本文梳理了吸收光谱技术的发展历程,明确了多光程吸收光谱技术的概念。依据吸收腔内是否发生谐振吸收,提出了基于谐振原理的吸收光谱技术这一概念,分析总结了谐振吸收光谱技术的研究现状,并对这些技术在各领域的应用进行概述。最后,对谐振吸收光谱技术中关键技术的未来发展进行了展望。

Optical path absorption spectroscopy is an important branch of absorption spectroscopy.In recent years,there has been a proliferation of optical path absorption spectroscopy techniques based on different light source technologies,absorption cavity technologies,and detection methods.As the demands on detection sensitivity and absorption optical path length increased,optical path absorption spectroscopy techniques based on the principle of enhanced absorption emerged,including integrated cavity spectroscopy(ICOS),cavity-enhanced absorption spectroscopy(CEAS)and cavity ring-down spectroscopy(CRDS).Enhanced absorption spectroscopy is advantageous for its high spectral resolution,high sensitivity,fast response time,and portability,but it presently lacks a unified concept and clear classification criteria.This paper compares the development history of absorption spectroscopy techniques and clarifies the concept of their multi-optical path.Based on whether resonant absorption occurs in the absorption cavity,the concept of absorption spectroscopy techniques based on resonance is proposed,and the current research status of resonant absorption spectroscopy techniques is analyzed and summarized,and the applications of this technique in various fields are outlined.Finally,the future development of key technologies in resonance absorption spectroscopy is envisioned.