The near infrared cavity-enhanced absorption spectrum of methyl cyanide

O’Leary, D.M.; Ruth, Albert A.; Dixneuf, Sophie; Orphal, J.; Varma, Ravi

doi:10.1016/j.jqsrt.2012.02.022

Cited by 18 publications

(4 citation statements)

References 62 publications

(55 reference statements)

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“…Conventional single pass absorption measurements were then taken in this narrow-band region with the gain-switched frequency comb (GSFC) in order to enable a quantitative comparison of conventional NH 3 detection in single pass measurements with the off-axis CEAS approach discussed in Section 3.3. For the single pass measurements, the cavity in Figure 1 was replaced by a static gas cell of length, d = 6610 mm, with optical quartz windows at either end [28,29,30,31], using standard on-axis alignment (position A of the steering mirror in Figure 1). In most cases, the Fourier transform spectrometer was used to detect the light transmitted by the sample gas with an integration time of 20 s (one scan per spectrum using Norton-Beer apodization medium).…”

Section: Resultsmentioning

confidence: 99%

Off-Axis Cavity-Enhanced Absorption Spectroscopy of 14NH3 in Air Using a Gain-Switched Frequency Comb at 1.514 μm

Chandran

Ruth

Martin

et al. 2019

Sensors

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A custom-designed gain-switched frequency comb (GSFC) source was passively coupled to a medium finesse (F ≈ 522) cavity in off-axis configuration for the detection of ammonia (14NH3) in static dry air. The absorption of ammonia was detected in the near infrared spectral region between 6604 and 6607 cm−1 using a Fourier transform detection scheme. More than 30 lines of the GSFC output (free spectral range 2.5 GHz) overlapped with the strongest ro-vibrational ammonia absorption features in that spectral region. With the cavity in off-axis configuration, an NH3 detection limit of ∼3.7 ppmv in 20 s was accomplished in a laboratory environment. The experimental performance of the prototype spectrometer was characterized; advantages, drawbacks and the potential for future applications are discussed.

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Section: Resultsmentioning

confidence: 99%

Off-Axis Cavity-Enhanced Absorption Spectroscopy of 14NH3 in Air Using a Gain-Switched Frequency Comb at 1.514 μm

Chandran

Ruth

Martin

et al. 2019

Sensors

Self Cite

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“…The general experimental setup has been published before [ [46] , [47] , [48] ] and thus merely the key experimental aspects are outlined here. The light source was a 2 W supercontinuum source (Fianium SC 450-2) operating at a repetition rate of 80 MHz.…”

Section: Methodsmentioning

confidence: 99%

“…To retrieve absolute absorption coefficients with FT-IBBCEAS, the broadband mirror reflectivity must be established [ 45 ]. The mirror reflectivity, R ( λ ), was calibrated by filling a well evacuated (∼10 −5 mbar) cavity with a known amount of CO 2 (∼10.7 mbar) [ 44 , 46 ]. Based on Eq.…”

Section: Methodsmentioning

confidence: 99%

Experimental observation of the ν1+3ν3 combination bands of 16O14N18O and 18O14N18O in the near infrared spectral region

Chandran,

Orphal,

Ruth

2024

Heliyon

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“…Compared to laser-based cavity enhanced spectroscopy, it is characterized by simplicity, the absence of any requirement for mode matching and mode-hopfree scanning, applicability to a spectral range starting from UV to infrared and simultaneous measurement of multispecies gases. [216,[227][228][229] A detailed analysis on this technique is given by Platt et al, [230] and a detailed review is provided by Zheng et al [231] An open-air configuration can be used instead of a gas cell for measuring gases over long distances (open path FTIR).…”

Section: Ftir-based Dasmentioning

confidence: 99%

Direct Absorption and Photoacoustic Spectroscopy for Gas Sensing and Analysis: A Critical Review

Fathy

Sabry

Hunter

et al. 2022

Laser & Photonics Reviews

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Optical spectroscopy has a broad scientific basis in chemistry, physics, and material science, with diverse applications in medicine, pharmaceuticals, agriculture, and environmental monitoring. Fourier transform infrared (FTIR) spectrometers and tunable laser spectrometers (TLS) are key devices for measuring optical spectra. Superior performance in terms of sensitivity, selectivity, accuracy, and resolution is required for applications in gas sensing. This review deals with gas measurement based on either direct optical absorption spectroscopy or photoacoustic spectroscopy. Both approaches are applicable to FTIR spectroscopy or TLS. In photoacoustic spectroscopy, cantilever-based photoacoustic spectroscopy is focused due its high performance. A literature survey is conducted revealing the recent technological advances. Theoretical fundamental detection limits are derived for TLS and FTIR, considering both direct absorption and photoacoustic spectroscopies. A theoretical comparison reveals which technology performs better. The minimum normalized absorption coefficient and normalized noise equivalent absorption coefficient appear as key parameters for this comparison. For TLS-based systems, direct absorption spectroscopy is found to be the best for lower laser power and longer path length. For FTIR-based systems, direct absorption is found to be the best for low temperature sources, higher spectrometer throughput, faster mirror velocity, and longer gas cells.

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The near infrared cavity-enhanced absorption spectrum of methyl cyanide

Cited by 18 publications

References 62 publications

Off-Axis Cavity-Enhanced Absorption Spectroscopy of 14NH3 in Air Using a Gain-Switched Frequency Comb at 1.514 μm

Off-Axis Cavity-Enhanced Absorption Spectroscopy of 14NH3 in Air Using a Gain-Switched Frequency Comb at 1.514 μm

Experimental observation of the ν1+3ν3 combination bands of 16O14N18O and 18O14N18O in the near infrared spectral region

Direct Absorption and Photoacoustic Spectroscopy for Gas Sensing and Analysis: A Critical Review

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