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Edwards CS, Barwood GP, Gill P, et al. Development of an IR tunable diode laser absorption spectrometer for trace humidity measurements at atmospheric pressure. Appl Opt. 1999;38(21):4699-704doi: 10.1364/ao.38.004699.
Edwards, C. S., Barwood, G. P., Gill, P., Schirmer, B., Venzke, H., & Melling, A. (1999). Development of an IR tunable diode laser absorption spectrometer for trace humidity measurements at atmospheric pressure. Applied optics, 38(21), 4699-704. https://doi.org/10.1364/ao.38.004699
Edwards, C S, et al. "Development of an IR tunable diode laser absorption spectrometer for trace humidity measurements at atmospheric pressure." Applied optics vol. 38,21 (1999): 4699-704. doi: https://doi.org/10.1364/ao.38.004699
Edwards CS, Barwood GP, Gill P, Schirmer B, Venzke H, Melling A. Development of an IR tunable diode laser absorption spectrometer for trace humidity measurements at atmospheric pressure. Appl Opt. 1999 Jul 20;38(21):4699-704. doi: 10.1364/ao.38.004699. PMID: 18323957.
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Appl Opt. 1999 Jul 20;38(21):4699-704. doi: 10.1364/ao.38.004699.

Development of an IR tunable diode laser absorption spectrometer for trace humidity measurements at atmospheric pressure.

Applied optics

C S Edwards, G P Barwood, P Gill, B Schirmer, H Venzke, A Melling

Affiliations

  1. Centre for Length Metrology, National Physical Laboratory, Queens Road, Teddington, Middlesex TW11 0LW, UK.

PMID: 18323957 DOI: 10.1364/ao.38.004699

Abstract

The development of a laser diode absorption spectrometer that uses a strong water vapor absorption at 1393 nm is reported. Three spectroscopic techniques were compared in approximately 0.4 m of laboratory air, namely, frequency modulation, wavelength modulation, and two-tone frequency modulation spectroscopy. The first two techniques use a single-frequency modulation at 9.2 GHz and 1 kHz, respectively, generated either by a phase modulator operating at 9.2 GHz or injection current modulation at 1 kHz. The two-tone method requires modulation at two frequencies, in this case 9.19 and 9.21 GHz. It is shown that the two-tone method should provide the highest sensitivity for a trace moisture detection system.

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