Detection of trace gases by rapidly-swept continuous-wave cavity ringdown spectroscopy: pushing the limits of sensitivity

被引：41
作者：
He, Y. [1 ]
Orr, B. J. [1 ]
机构：
[1] Macquarie Univ, Ctr Lasers & Applicat, Sydney, NSW 2109, Australia
来源：
APPLIED PHYSICS B-LASERS AND OPTICS | 2006年 / 85卷 / 2-3期
关键词：
D O I：
10.1007/s00340-006-2371-2
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Cavity ringdown (CRD) absorption spectroscopy enables spectroscopic sensing of gases with a high sensitivity and accuracy. Instrumental improvements result in a new high-performance continuous-wave (cw) CRD spectrometer using a rapidly-swept cavity of simple design. It employs efficient data-acquisition procedures, high-reflectivity mirrors, a low-adsorption flow cell, and various compact fibre-optical components in a single-ended transmitter-receiver configuration suitable for remote sensing. Baseline noise levels in our latest cw-CRD experiments yield a competitive noise-equivalent absorption limit of similar to 5x10(-10) cm(-1) Hz(-1/2), independent of whatever molecules are to be detected. Measurements in the near-infrared wavelength range of 1.51-1.56 mu m yield sub-ppmv (i.e., ppbv or better) sensitivity in the gas phase for several representative molecules (notably CO2, CO, H2O, NH3, C2H2, and other hydrocarbons). By measuring spectroscopic features in the 1.525 mu m band of C2H2 gas, we realise detection limits of 19 nTorr (2.5x10(-11) atm) of neat C2H2 (Doppler-limited at low pressure) and 0.37 ppbv of C2H2 in air (pressure-broadened at 1 atm). Our cw-CRD spectrometer is a high-performance sensor in a relatively simple, low-cost, compact instrument that is amenable to chemical analysis of trace gases in medicine, agriculture, industry, and the environment.
引用
收藏
页码：355 / 364
页数：10
相关论文
共 71 条
[21]   High-resolution cavity ring-down absorption spectroscopy of nitrous oxide and chloroform using a near-infrared cw diode laser [J].
He, YB ;
Hippler, M ;
Quack, M .
CHEMICAL PHYSICS LETTERS, 1998, 289 (5-6) :527-534
[22]   Ringdown and cavity-enhanced absorption spectroscopy using a continuous-wave tunable diode laser and a rapidly swept optical cavity [J].
He, YB ;
Orr, BJ .
CHEMICAL PHYSICS LETTERS, 2000, 319 (1-2) :131-137
[23]   Cavity ringdown spectroscopy: New approaches and outcomes [J].
He, YB ;
Orr, BJ .
JOURNAL OF THE CHINESE CHEMICAL SOCIETY, 2001, 48 (03) :591-601
[24]   Optical heterodyne signal generation and detection in cavity ringdown spectroscopy based on a rapidly swept cavity [J].
He, YB ;
Orr, BJ .
CHEMICAL PHYSICS LETTERS, 2001, 335 (3-4) :215-220
[25]   Very high sensitivity CW-cavity ring down spectroscopy:: Application to the a 1Δg(0)-X 3Σ-g(1) O2 band near 1.58 μm [J].
Kassi, S ;
Romanini, D ;
Campargue, A ;
Bussery-Honvault, B .
CHEMICAL PHYSICS LETTERS, 2005, 409 (4-6) :281-287
[26]   Applications of quartz tuning forks in spectroscopic gas sensing [J].
Kosterev, AA ;
Tittel, FK ;
Serebryakov, DV ;
Malinovsky, AL ;
Morozov, IV .
REVIEW OF SCIENTIFIC INSTRUMENTS, 2005, 76 (04)
[27]   THE ABSORPTION-SPECTRUM OF C2H2 AROUND NU(1)+NU(3) - ENERGY STANDARDS IN THE 1.5 MU-M REGION AND VIBRATIONAL CLUSTERING [J].
KOU, Q ;
GUELACHVILI, G ;
TEMSAMANI, MA ;
HERMAN, M .
CANADIAN JOURNAL OF PHYSICS, 1994, 72 (11-12) :1241-1250
[28]   Frequency-switched heterodyne cavity ringdown spectroscopy [J].
Levenson, MD ;
Paldus, BA ;
Spence, TG ;
Harb, CC ;
Zare, RN ;
Lawrence, MJ ;
Byer, RL .
OPTICS LETTERS, 2000, 25 (12) :920-922
[29]   Ultrasensitive frequency-modulation spectroscopy enhanced by a high-finesse optical cavity:: theory and application to overtone transitions of C2H2 and C2HD [J].
Ma, LS ;
Ye, J ;
Dubé, P ;
Hall, JL .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1999, 16 (12) :2255-2268
[30]   High-sensitivity CW-cavity ringdown spectroscopy of 12CO2 near 1.5 μm [J].
Majcherova, Z ;
Macko, P ;
Romanini, D ;
Perevalov, VI ;
Tashkun, SA ;
Teffo, JL ;
Campargue, A .
JOURNAL OF MOLECULAR SPECTROSCOPY, 2005, 230 (01) :1-21
12345678