Water vapour and carbon dioxide interference in the high sensitivity detection of NH3 with semiconductor diode lasers at 1.5 μm

被引：26

作者：

Modugno, G

Corsi, C

机构：

[1] European Lab Nonlinear Spect, LENS, I-50125 Florence, Italy

[2] Ist Nazl Fis Mat, I-50125 Florence, Italy

[3] Scuola Normale Super Pisa, I-56126 Pisa, Italy

[4] Univ Florence, Dipartimento Sci Neurol, I-50134 Florence, Italy

来源：

INFRARED PHYSICS & TECHNOLOGY | 1999年 / 40卷 / 02期

关键词：

ammonia; near-infrared; trace gas detection; two-tone frequency modulation; pressure broadening coefficients;

D O I：

10.1016/S1350-4495(98)00051-6

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

H2O and CO2 interferences with NH3 absorption lines in the combination band at 1.5 mu m are investigated by means of diode laser spectroscopy, in conjunction with a high sensitivity two-tone frequency modulation technique. Two different spectral regions 6685-6700 cm(-1) and 6475-6494 cm(-1), respectively are analyzed, anti the strongest interference free ammonia lines are identified as possible candidates for high sensitivity detection of ammonia traces in air. Detection limits of 4.5 ppm m at 6482.69 cm(-1) and 4 ppm m at 6689.56 cm(-1) for ammonia in air at atmospheric pressure are demonstrated. In addition, self and air broadening parameters are measured for some of the investigated lines. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：93 / 99

页数：7

共 14 条

[1]

AHLBERG H, 1994, SPECTROSCOPY EUROPE, V6, P22

[2] SENSITIVE DETECTION OF AMMONIA ABSORPTION BY USING A 1.65 MU-M DISTRIBUTED-FEEDBACK INGAASP DIODE-LASER [J].