Measurements of NO&lt;SUB&gt;2&lt;/SUB&gt; Concentration with Wide Dynamic Range Based on Laser Absorption Spectroscopy Using a Multi-Pass Optical Cell

Ohtani, Nobuyoshi; Endo, Masamori; Yamaguchi, Shigeru; Nanri, Kenzo; Fujioka, Tomoo; Morita, Takakazu; Horisawa, Hideyuki

doi:10.2184/lsj.34.3_246

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“…6,7) Conventional absorption spectroscopy with an optical multipass cell causes nonuniform temperatures owing to the large optical path volume (>500 cm 3 ) even for very small flow rates. 8) Recently, subppb trace gas detection based on photoacoustic spectroscopy using a distributed feedback diode laser (DL) in a 1 cm 3 sample volume has been reported. 9) Cavity ringdown spectroscopy (CRDS) also has great potential for ppb level trace gas detection in small sampling volumes ($25 cm 3 ).…”

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confidence: 99%

Simple Real Time Trace Nitrogen Dioxide Detector Based on Continuous-Wave Cavity Ringdown Spectroscopy Using Passively Locked External Cavity Diode Laser

Sato¹,

Nemoto²,

Yamaguchi³

et al. 2008

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We report on a compact trace nitrogen dioxide (NO 2 ) detector based on cavity ringdown spectroscopy (CRDS), using a passively locked external cavity diode laser (PLEC-DL) in the visible wavelength region. Tailoring the spatial mode matching conditions of an antireflection (AR)-coated diode laser with a high finesse external cavity for effective optical feedback into the DL allows for stable resonant enhancement in the external cavity without any electric feedback apparatus. The external cavity having a finesse in excess of 1:4 Â 10 5 acts as a ringdown cavity with an effective optical volume (i.e., detection volume) of less than 1 cm 3 . We successfully demonstrated a noise equivalent absorption loss of 1:4 Â 10 À8 cm À1 , corresponding to a detection limit of 40 ppb NO 2 concentration with a very compact configuration. For differential absorption CRDS, we realized a dual wavelength-locked PLEC-DL in an external cavity simultaneously. Measurements of various NO 2 concentrations in N 2 based on differential absorption CRDS were performed.

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