三种双光子激光诱导荧光 CO 检测方案在火焰中的比较。

Comparison of three schemes of two-photon laser-induced fluorescence for CO detection in flames.

机构信息

Division of Combustion Physics, Lund University, Box 118, S-22100 Lund, Sweden.

出版信息

Appl Spectrosc. 2013 Mar;67(3):314-20. doi: 10.1366/12-06704.

Abstract

Two-photon excitation laser-induced fluorescence of carbon monoxide suffers from interference from mainly C2 and strong pressure quenching. This paper presents an investigation of three excitation/detection schemes for two-photon excitation laser-induced fluorescence on carbon monoxide. The schemes are evaluated for pressure and quenching partner dependencies and C2 interference. Three different emission bands lie in the Hopefield-Birge system: The Ångström B(1)Σ(+)→A(1)Πu band, with two-photon excitation through B(1)Σ(+)←X(1)Π around 230 nm; the Herzberg band C(1)Σ(+)→A(1)Πu, with two-photon excitation through, C(1)Σ(+)←X(1)Π, around 217 nm; and the third positive group b(3)Σ→a(3)Π, also with excitation of B(1)Σ(+)←X(1)Π around 230 nm. The measurements are performed in laminar premixed flames with various equivalence ratios as well as in a high-pressure cell, where pressure and species concentrations are varied in order to investigate the fluorescence quenching dependence.

摘要

一氧化碳的双光子激发激光诱导荧光受到主要来自 C2 和强压力猝灭的干扰。本文研究了三种用于一氧化碳的双光子激发激光诱导荧光的激发/检测方案。这些方案针对压力和猝灭伙伴依赖性以及 C2 干扰进行了评估。Hopefield-Birge 系统中有三个不同的发射带：Ångström B(1)Σ(+)→A(1)Πu 带，通过 B(1)Σ(+)←X(1)Π 在 230nm 左右进行双光子激发； Herzberg 带 C(1)Σ(+)→A(1)Πu，通过 C(1)Σ(+)←X(1)Π 在 217nm 左右进行双光子激发；以及第三正集团 b(3)Σ→a(3)Π，也通过 B(1)Σ(+)←X(1)Π 在 230nm 左右进行激发。这些测量是在层流预混火焰中进行的，具有不同的当量比，以及在高压室中进行的，在高压室中可以改变压力和物质浓度，以研究荧光猝灭的依赖性。