Near infrared cavity enhanced absorption spectra of atmospherically relevant ether-1, 4-Dioxane

Chandran, Satheesh; Varma, Ravi

doi:10.1016/j.saa.2015.09.030

Cited by 13 publications

(10 citation statements)

References 18 publications

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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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“…By replacing a scanning spectrum analyzer with a detector array, the spectral acquisition time can be reduced, leading to a high temporal resolution and an increased sensitivity [ 93 ] In addition, this improvement will also decrease the sensor cost and make it more compact [ 91 ] Secondly, the FT-IBBCEAS can be used to record the absorption property of a gas molecular over a broad spectral region with sufficiently high resolution. This technique is helpful to identify weak absorption of specific gaseous species, together with many other useful applications, including spectral studies of isotopic samples, flames, plasma discharges or detection of chemical sources [ 65 ].…”

Section: Discussionmentioning

confidence: 99%

“…Widely used as an industrial solvent, C 4 H 8 O 2 is considered as the major anthropogenic source of 1,4-dioxane in the atmosphere [ 89 , 90 ]. Chandran et al [ 65 ] reported a novel FT-IBBCEAS to record the absorption of C 4 H 8 O 2 in the spectral range of 5900−8230 cm −1 with a resolution of 0.08 cm −1 . Light from a SC source was coupled into a 644 cm-long optical cavity, leading to a MDL represented by an absorption coefficient of 8 × 10 −8 cm −1 (~200 pptv) with an averaging time of 120 min.…”

Section: Target Gas Species Performances In Laboratorymentioning

confidence: 99%

Review of Incoherent Broadband Cavity-Enhanced Absorption Spectroscopy (IBBCEAS) for Gas Sensing

Zheng

et al. 2018

Sensors

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Incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) is of importance for gas detection in environmental monitoring. This review summarizes the unique properties, development and recent progress of the IBBCEAS technique. Principle of IBBCEAS for gas sensing is described, and the development of IBBCEAS from the perspective of system structure is elaborated, including light source, cavity and detection scheme. Performances of the reported IBBCEAS sensor system in laboratory and field measurements are reported. Potential applications of this technique are discussed.

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“…Typical enhancement methods are internal multi-reflection cells or cavity-enhanced techniques (see e.g. [22,23]).…”

Section: Requirementsmentioning

confidence: 99%

Custom-built light-pipe cell for high-resolution infrared absorption spectroscopy of tritiated water vapor and other hazardous gases

et al. 2019

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We present a new custom-built cell for high-resolution absorption spectroscopy of hazardous gases. The use of an aluminum light-pipe enables sensitive detection due to the small tube diameter and an increased particle density in the interaction volume for a limited analyte amount in the cell, while avoiding additional surfaces such as mirrors. To demonstrate this, we have used the cell to measure tritiated water isotopologues (HTO and traces of T 2 O) for which spectroscopic data is scarce, due to the challenge of performing spectroscopy of these highly radio-chemical aggressive substances. For this purpose, the new cell also features the efficient inline-production of tritiated water. In this paper we present the concept of the light-pipe cell and demonstrate its performance with a high-resolution absorption spectrum of gaseous HTO generated inside of this cell.

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Near infrared cavity enhanced absorption spectra of atmospherically relevant ether-1, 4-Dioxane

Cited by 13 publications

References 18 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

Review of Incoherent Broadband Cavity-Enhanced Absorption Spectroscopy (IBBCEAS) for Gas Sensing

Custom-built light-pipe cell for high-resolution infrared absorption spectroscopy of tritiated water vapor and other hazardous gases

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