OPTOACOUSTIC TRACE-GAS MONITORING WITH NEAR-INFRARED DIODE-LASERS

被引：64

作者：

FEHER, M ^{[1
]}

JIANG, Y ^{[1
]}

MAIER, JP ^{[1
]}

MIKLOS, A ^{[1
]}

机构：

[1] HUNGARIAN ACAD SCI, INST ISOTOPES, H-1525 BUDAPEST, HUNGARY

来源：

APPLIED OPTICS | 1994年 / 33卷 / 09期

关键词：

D O I：

10.1364/AO.33.001655

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

An inexpensive resonant optoacoustic monitoring system using near-infrared laser diodes was developed. It was demonstrated that wavelength modulation at the resonance frequency of the cell provides a superior signal-to-noise ratio compared with amplitude modulation and eliminates background drifts and fluctuations. The system was tested out on ammonia. Its sensitivity is 8 parts in 10(9) (S/N = 1) at atmospheric pressure, which corresponds to a minimum detectable absorption coefficient of approximately 3.5 x 10(-11) cm-1 W-1. The pressure dependence of the optoacoustic resonance was also investigated. The monitor can be used as a continuous flow-through system up to a flow rate of approximately 3.5 L/min.

引用

页码：1655 / 1658

页数：4

共 21 条

[1] EXPERIMENTAL IMPROVEMENTS IN RECORDING GAS-PHASE PHOTOACOUSTIC SPECTRA
DAVIDSSON, J
GUTOW, JH
ZARE, RN
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1990, 94 (10) : 4069 - 4073
[2] DILIETO A, 1982, APPL PHYS B-PHOTO, V27, P1, DOI 10.1007/BF00697288
[3] INEXPENSIVE NEAR-INFRARED DIODE-LASER-BASED DETECTION SYSTEM FOR AMMONIA
FEHER, M
MARTIN, PA
ROHRBACHER, A
SOLIVA, AM
MAIER, JP
[J]. APPLIED OPTICS, 1993, 32 (12): : 2028 - 2030
[4] GRISAR R, 1987, MONITORING GASEOUS 1
[5] GRISAR R, 1989, MONITORING GASEOUS 2
[6] GRISAR R, 1992, MONITORING GASEOUS 3
[7] HENRY BR, 1989, PROG ANAL SPECTROSC, V12, P349
[8] Hess P., 1988, SPRINGER SERIES OPTI, V58
[9] JOHNSON MD, 1986, J ECUMENICAL STUD, V23, P1
[10] Mandelis A., 1992, PRINCIPLES PERSPECTI

← 1 2 3 →