A Compact, Cylindrical Multi-pass Cell for Sensitive Detection of Gas Absorption

Nishimoto, Tomokazu; Kato, Yoshihiro; Someya, Ryuta; Sato, Junichi; Nakamur, Takahiro; Yamaguchi, Shigeru; Nanri, Kenzo; Fujioka, Tomoo

doi:10.2184/lsj.36.1276

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…The use of multipass (White or Herriott) cells (Fig. 3) can also improve sensitivity [221,222] and background interference can be suppressed using the Zeeman effect [223], whereby a transverse magnetic field is applied to the absorbing sample. The measured transmittance then depends on the polarisation state of the incoming light.…”

Section: Fundamentalsmentioning

confidence: 99%

On-line spectroscopic and spectrometric methods for the determination of metal species in industrial processes☆

Monkhouse

2011

Progress in Energy and Combustion Science

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Section: Fundamentalsmentioning

confidence: 99%

On-line spectroscopic and spectrometric methods for the determination of metal species in industrial processes☆

Monkhouse

2011

Progress in Energy and Combustion Science

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“…Typical methods are represented by cavity ring-down spectroscopy (CRDS) [20][21][22][23] and cavity-enhanced absorption spectroscopy (CEAS). 12,20,24,25) Compact continuous wave (CW) light sources, such as distributed feedback diode lasers (DFB-DL), 26) external cavity diode lasers (ECDL), 27) amplified spontaneous emission (ASE), 28) and quantum cascade lasers (QCL), 29) have been investigated. The sensitivity of these systems is typically around 10 −9 cm À1 = ffiffiffiffiffiffi Hz p .…”

Section: Introductionmentioning

confidence: 99%

Performance characteristics of a passively locked cavity-enhanced absorption spectrometer with wideband-tunable multimode near-infrared light source

Someya

Imamura

Okamoto

et al. 2016

Jpn. J. Appl. Phys.

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A trace material detection system was developed on the basis of cavity-enhanced absorption spectroscopy (CEAS) using a fiber-coupled passively locked external cavity diode laser (PLEC-DL) in the near-infrared (NIR) wavelength region. The oscillation range of an antireflection-coated diode laser (AR-DL) coupled into an external cavity could be simply selected with a narrowband bandpass filter (1 nm), resulting in a stable wavelength oscillation in the wideband tunability between 1640 and 1680 nm. The external cavity acts as a trace material sensor that exhibits excellent flexibility because it is free from the DL source and is carefully designed with mirrors having reflectivities of ca. 99.995 and 99.99%. Trace-level detection was successfully demonstrated with the developed sensor having a minimum detectable absorption coefficient of 2.4 × 10−8 cm−1, which corresponds to 0.15 ppm for CH4 concentration without interference from H2O absorption lines under atmospheric pressure.

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“…A light‐emitting diode or broadband source free of collimation can be used to substitute the expensive laser diode. Nishimoto et al developed a cylindrical multipass cell with six spherical mirrors aligned along a circle. The optical path length can be easily varied with the angle of the incident light.…”

Section: Introductionmentioning

confidence: 99%

Design of new multipass gas cells with circular and elliptical cross‐section

Yan

Wang

Somesfalean

2014

Micro & Optical Tech Letters

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Two new types of multipass gas cells with circular and elliptical cross‐sections were developed. As for a cylindrical cell, the reflected rays in the circle would be an irregular trace without superposition and termination, if its central angle is a bit more than 2π/3 for an example. Each two adjacent reflected points have the same optical path difference and optical light passes through different optical distances before different reflection points. As for a cylindroidal cell, if the optical ray passes through one focus point of the ellipse, it must also pass through the other. The light will exit finally from the termination point of an axis. The optical distance depends on the eccentricity of the ellipse and the size of the emergent window. In this article, the detailed mathematical derivations of the optical multireflection traces for the two structures are presented. The unified formula is developed. It is found that these designs have small volumes and adjustable long optical paths. For example, the optical distances in the two structures are about 625 mm for a circle with 50 mm radius. The performance of the system can be enhanced by coating high total reflection film, increasing the processing and positioning precisions, and using highly collimating laser beam. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:3003–3009, 2014

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A Compact, Cylindrical Multi-pass Cell for Sensitive Detection of Gas Absorption

Cited by 4 publications

References 3 publications

On-line spectroscopic and spectrometric methods for the determination of metal species in industrial processes☆

On-line spectroscopic and spectrometric methods for the determination of metal species in industrial processes☆

Performance characteristics of a passively locked cavity-enhanced absorption spectrometer with wideband-tunable multimode near-infrared light source

Design of new multipass gas cells with circular and elliptical cross‐section

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