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Titolo:
Efficient reduction of fringe noise in trace gas detection with diode laser multipass absorption spectroscopy
Autore:
Wu, SQ; Kimishima, T; Kuze, H; Takeuchi, N;
Indirizzi:
Nippon Sanso Corp, Tsukuba Labs, Tsukuba, Ibaraki 3002611, Japan Nippon Sanso Corp Tsukuba Ibaraki Japan 3002611 a, Ibaraki 3002611, Japan Chiba Univ, CEReS, Inage Ku, Chiba 2638522, Japan Chiba Univ Chiba Japan2638522 iv, CEReS, Inage Ku, Chiba 2638522, Japan
Titolo Testata:
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS
fascicolo: 7A, volume: 39, anno: 2000,
pagine: 4034 - 4040
SICI:
0021-4922(200007)39:7A<4034:EROFNI>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
FREQUENCY-MODULATION SPECTROSCOPY; HETERODYNE SPECTROSCOPY; MOISTURE; SPECTROMETRY;
Keywords:
trace moisture; diode laser; near-infrared; absorption spectroscopy; multipass cell; detection; frequency modulation; optical fringe; 2f signal;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Wu, SQ Nippon Sanso Corp, Tsukuba Labs, 10 Ohkubo, Tsukuba, Ibaraki 3002611, Japan Nippon Sanso Corp 10 Ohkubo Tsukuba Ibaraki Japan 3002611 11, Japan
Citazione:
S.Q. Wu et al., "Efficient reduction of fringe noise in trace gas detection with diode laser multipass absorption spectroscopy", JPN J A P 1, 39(7A), 2000, pp. 4034-4040

Abstract

The combination of a diode laser source and a multipass cell is attractivefor the detection of trace Eases. The sensitivity achievable with this system, however, is often limited by etalon fringes arising from path length difference among the optical components. In this paper, we describe a sensitive detection method that minimizes the effect of the fringes. In accordance with the expected widths of the 2f (second-harmonic of the modulation frequency) absorption signals of the target molecule, the base length of a multipass cell is chosen so that the free spectral range of the fringes becomes much narrower than the signal widths. Then, the 2f signal is subjected tomultistage smoothing to remove the fringe noise by exploiting its periodicity. As a demonstration of this method, trace moisture in nitrogen is detected using a near-infrared, distributed-feedback diode laser and a multipasscell of 20 m absorption length. The detection limit of the system is foundto be about 2.3 ppb, two orders of magnitude better than the limit before fringe elimination.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 06:32:36