Design of cavity-enhanced absorption cell for reducing transit-time broadening

Abe, Matazô; Iwakuni, Kana; Okubo, Sho; Sasada, Hiroyuki

doi:10.1364/ol.39.005277

Cited by 10 publications

(3 citation statements)

References 10 publications

(16 reference statements)

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“…The major source of noise is due to vibrational and acoustic perturbations of the cavity and efforts are underway to counteract this. The line widths could also be improved by increasing the beam waist diameter as described by Abe et al 24 With these improvements, several of the assignment questions raised above could be definitively resolved. In any case, the spectrum of ammonia in this region remains fertile ground for future sub-Doppler measurements.…”

Section: Discussionmentioning

confidence: 99%

Quadrupole splittings in the near-infrared spectrum of 14NH3

Twagirayezu

Hall

Sears

2016

The Journal of Chemical Physics

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Section: Discussionmentioning

confidence: 99%

Quadrupole splittings in the near-infrared spectrum of 14NH3

Twagirayezu

Hall

Sears

2016

The Journal of Chemical Physics

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“…To achieve a high detection sensitivity, a high-finesse cavity based absorption spectroscopy technique can be used for increasing the effective absorption path length while retaining a relatively small sample volume [5,6]. In particular, cavity ring-down spectroscopy (CRDS) [7,8], cavity-enhanced absorption spectroscopy (CEAS) [9][10][11][12][13] and off-axis integrated-cavity output spectroscopy (OA-ICOS) [14,15] are effective spectroscopic techniques developed in the past decade and allow a considerable improvement in detection sensitivity. These techniques offer different advantages and disadvantages in terms of selectivity, portability, sensitivity and cost.…”

Section: Introductionmentioning

confidence: 99%

Near-infrared acetylene sensor system using off-axis integrated-cavity output spectroscopy and two measurement schemes

Zheng¹,

Zheng²,

He³

et al. 2018

Opt. Express

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For highly sensitive and accurate acetylene (C 2 H 2 ) detection, a near-infrared (NIR) off-axis integrated-cavity output spectroscopy (OA-ICOS) sensor system based on an ultracompact cage-based absorption cell was proposed. The absorption cell with dimensions of 10 cm × 8 cm × 6 cm realized a dense-pattern and an easily-aligned stable optical system. The OA-ICOS sensor system employed a 6cm-long optical cavity that was formed by two mirrors with a reflectivity of 99.35% and provided an effective absorption path length of ∼9.28 m. The performance of the C 2 H 2 sensor system based on two measurement schemes, i.e. laser direct absorption spectroscopy (LDAS) and wavelength modulation spectroscopy (WMS) is reported. A NIR distributed feedback (DFB) laser was employed for targeting a C 2 H 2 absorption line at 6523.88 cm −1 . An Allan deviation analysis yielded a detection sensitivity of 760 parts-per-billion in volume (ppbv) for an averaging time of 304 s using the LDAS-based OA-ICOS. A detection sensitivity of 85 ppbv for an averaging time of 250 s was obtained using the WMS-based OA-ICOS, which was further improved by a factor of ~9 compared to the result obtained with the LDAS method. The proposed sensor system has the advantages of reduced size and cost with acceptable detection sensitivity, which is suitable for applications in trace gas sensing in harsh environments and weight-limited balloon-embedded observations.

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“…To achieve a high sensitivity, the multi-pass absorption spectroscopy technique is used, which increases the effective absorption path length while retaining a comparatively small sample volume. Cavity ring-down spectroscopy (CRDS) [ 4 , 5 ] and cavity-enhanced absorption spectroscopy [ 6 , 7 , 8 , 9 , 10 ] (CEAS) are two multi-pass techniques based on optical cavities. In CRDS, the ring-down time representing the decay rate of the light intensity leaking from an optical cavity is calculated from the measured signal and used to determine the gas concentration.…”

Section: Introductionmentioning

confidence: 99%

Repetitively Mode-Locked Cavity-Enhanced Absorption Spectroscopy (RML-CEAS) for Near-Infrared Gas Sensing

Zheng

et al. 2017

Sensors

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A Pound-Drever-Hall (PDH)-based mode-locked cavity-enhanced sensor system was developed using a distributed feedback diode laser centered at 1.53 µm as the laser source. Laser temperature scanning, bias control of the piezoelectric ceramic transducer (PZT) and proportional-integral-derivative (PID) feedback control of diode laser current were used to repetitively lock the laser modes to the cavity modes. A gas absorption spectrum was obtained by using a series of absorption data from the discrete mode-locked points. The 15 cm-long Fabry-Perot cavity was sealed using an enclosure with an inlet and outlet for gas pumping and a PZT for cavity length tuning. The performance of the sensor system was evaluated by conducting water vapor measurements. A linear relationship was observed between the measured absorption signal amplitude and the H2O concentration. A minimum detectable absorption coefficient of 1.5 × 10–8 cm–1 was achieved with an averaging time of 700 s. This technique can also be used for the detection of other trace gas species by targeting the corresponding gas absorption line.

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Design of cavity-enhanced absorption cell for reducing transit-time broadening

Cited by 10 publications

References 10 publications

Quadrupole splittings in the near-infrared spectrum of 14NH3

Quadrupole splittings in the near-infrared spectrum of 14NH3

Near-infrared acetylene sensor system using off-axis integrated-cavity output spectroscopy and two measurement schemes

Repetitively Mode-Locked Cavity-Enhanced Absorption Spectroscopy (RML-CEAS) for Near-Infrared Gas Sensing

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