Difference-frequency-based tunable absorption spectrometer for detection of atmospheric formaldehyde

被引：54

作者：

Lancaster, DG

Fried, A

Wert, B

Henry, B

Tittel, FK

机构：

[1] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA

[2] Natl Ctr Atmospher Res, Boulder, CO 80307 USA

[3] Univ Colorado, Dept Chem, Boulder, CO 80309 USA

来源：

APPLIED OPTICS | 2000年 / 39卷 / 24期

关键词：

D O I：

10.1364/AO.39.004436

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

High-sensitivity detection of formaldehyde (CH2O) at 3.5315 mu m (2831.64 cm(-1)) is reported with a diode-laser-pumped, fiber-coupled, periodically poled LiNbO3 spectroscopic source. This source replaced the Pb-salt diode laser Dewar assembly of an existing tunable diode-laser absorption spectrometer designed for ultrasensitive detection of CH2O. Spectra are recorded with 2f-modulation spectroscopy and zero-air rapid background subtraction. Initial measurements reported here, determined from multiple measurements of a flowing 7.7 parts per billion by volume (ppbv, parts in 10(9)) CH2O in air mixture, indicate replicate precisions as low as 0.24 ppbv. (C) 2000 Optical Society of America OCIS codes: 010.1120, 120.6200, 300.6340, 190.2620.

引用

收藏

页码：4436 / 4443

页数：8

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