Cavity Ring-Down Spectroscopy: Recent Technological Advancements, Techniques, and Applications

Maity, Abhijit; Maithani, Sanchi; Pradhan, Manik

doi:10.1021/acs.analchem.0c04329

Cited by 63 publications

(34 citation statements)

References 227 publications

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“…The high sensitivity and baseline stability of the continuous wave CRDS technique (Berden et al., 2000; Maity et al., 2021; Romanini et al., 1997) have been largely demonstrated during the last years (Campargue et al., 2016 and references herein; Kassi & Campargue, 2012). Reader is referred to (Kassi & Campargue, 2012; Mondelain et al., 2019) for the presentation of our CRDS setup.…”

Section: Experimental Set‐upmentioning

confidence: 98%

Temperature Dependence of the Collision‐Induced Absorption Band of O₂ Near 1.27 µm

et al. 2021

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The 1.27 μm O2 band is increasingly called upon for air‐mass determination from ground‐based and space‐borne atmospheric spectra because of its spectral proximity to CO2, and CH4 bands at 1.6 μm, in contrast to the more distant A‐band at 0.76 μm. For this purpose, it is important to well characterize not only the narrow absorption lines but also the strong underlying broad collision‐induced absorption (CIA) structure and its temperature dependence. Spectra of pure O2, and of O2 in N2, were recorded by cavity ring down spectroscopy (CRDS) at 271 K and 332 K, with the help of a newly developed temperature regulated cell. The quality of the spectra allowed determining the small variations (at the few percent level) of the BO2−O2, BO2−N2, and BO2−air binary coefficients with temperature. Together with the binary coefficients at 297 K reported previously, they allow characterizing the temperature dependence of the O2 CIA at 1.27 µm in atmospheric conditions. The obtained results are compared with previous measurements by Fourier transform spectroscopy (FTS) and recent theoretical calculations. In the wings of the O2‐O2 CIA, an increase with temperature is observed in agreement with calculations but contrary to these calculations, a decrease is observed near the maximum of the CIA band. The temperature dependence is found in good agreement with the theoretical BN2−O2values and the experimental BO2−air values derived from the FTS measurements. Binary coefficients integrated over the entire band show almost no variation with temperature for O2‐N2 and a small increase for pure O2, in agreement with the theoretical predictions.

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Section: Experimental Set‐upmentioning

confidence: 98%

Temperature Dependence of the Collision‐Induced Absorption Band of O₂ Near 1.27 µm

et al. 2021

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“…When laser with an intensity of I in passes through uniform gas substance, the laser decays to I out due to gas absorption, which can be described by the Beer-Lamber law [ 10 , 17 ]:

where, α (cm −1 ) is the spectral absorption coefficient, L (cm) is the interaction distance.…”

Section: Principle Of Crds-based Seawater Dissolved Gas Measurementmentioning

confidence: 99%

“…The time for the initial laser intensity reduces to 1/e in the measurement is defined as the ring-down time [ 17 ]. According to Equation (7), in the case of no gas absorption, the empty cavity ring-down time

is:

…”

Section: Principle Of Crds-based Seawater Dissolved Gas Measurementmentioning

confidence: 99%

“…Using mid-infrared absorption spectroscopy technology, Zheng Chuantao et al achieved the measurement of dissolved CO 2 and its isotope δ 13 CO 2 [ 12 ]. In addition, cavity ring-down spectroscopy (CRDS), proposed by O, Keefe and Deacon in 1988 [ 17 ], has ultra-high detection sensitivity, light intensity jitter immunity and free instrument calibration, making CRDS one of the best candidates for gas detection. The past years have witnessed its remarkable progresses in precision spectroscopy [ 18 , 19 , 20 ] and important applications in atmospheric trace gas measurement [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

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A Fiber-Integrated CRDS Sensor for In-Situ Measurement of Dissolved Carbon Dioxide in Seawater

Chen

et al. 2021

Sensors

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Research on carbon dioxide (CO2) geological and biogeochemical cycles in the ocean is important to support the geoscience study. Continuous in-situ measurement of dissolved CO2 is critically needed. However, the time and spatial resolution are being restricted due to the challenges of very high submarine pressure and quite low efficiency in water-gas separation, which, therefore, are emerging the main barriers to deep sea investigation. We develop a fiber-integrated sensor based on cavity ring-down spectroscopy for in-situ CO2 measurement. Furthermore, a fast concentration retrieval model using exponential fit is proposed at non-equilibrium condition. The in-situ dissolved CO2 measurement achieves 10 times faster than conventional methods, where an equilibrium condition is needed. As a proof of principle, near-coast in-situ CO2 measurement was implemented in Sanya City, Haina, China, obtaining an effective dissolved CO2 concentration of ~950 ppm. The experimental results prove the feasibly for fast dissolved gas measurement, which would benefit the ocean investigation with more detailed scientific data.

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“…In recent years, differential optical absorption spectroscopy (DOAS) [3][4][5] plays an important role in gas detection and is mainly used in the ultraviolet band. Cavity-enhanced absorption spectroscopy (CEAS) [6][7][8][9] and cavity ring-down absorption spectroscopy (CRAS) [10,11] are the other two most commonly employed optical methods. In these systems, high reflection mirrors (>99.99%) are used as the window of the gas cell, and consequently the maintenance of the mirrors has always been an important issue.…”

Section: Introductionmentioning

confidence: 99%

High Sensitivity Continuous Monitoring of Chloroform Gas by Using Wavelength Modulation Photoacoustic Spectroscopy in the Near-Infrared Range

et al. 2021

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An optical system for gaseous chloroform (CHCl3) detection based on wavelength modulation photoacoustic spectroscopy (WMPAS) is proposed for the first time by using a distributed feedback (DFB) laser with a center wavelength of 1683 nm where chloroform has strong and complex absorption peaks. The WMPAS sensor developed possesses the advantages of having a simple structure, high-sensitivity, and direct measurement. A resonant cavity made of stainless steel with a resonant frequency of 6390 Hz was utilized, and eight microphones were located at the middle of the resonator at uniform intervals to collect the sound signal. All of the devices were integrated into an instrument box for practical applications. The performance of the WMPAS sensor was experimentally demonstrated with the measurement of different concentrations of chloroform from 63 to 625 ppm. A linear coefficient R2 of 0.999 and a detection sensitivity of 0.28 ppm with a time period of 20 s were achieved at room temperature (around 20 °C) and atmosphere pressure. Long-time continuous monitoring for a fixed concentration of chloroform gas was carried out to demonstrate the excellent stability of the system. The performance of the system shows great practical value for the detection of chloroform gas in industrial applications.

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Cavity Ring-Down Spectroscopy: Recent Technological Advancements, Techniques, and Applications

Cited by 63 publications

References 227 publications

Temperature Dependence of the Collision‐Induced Absorption Band of O₂ Near 1.27 µm

Temperature Dependence of the Collision‐Induced Absorption Band of O₂ Near 1.27 µm

A Fiber-Integrated CRDS Sensor for In-Situ Measurement of Dissolved Carbon Dioxide in Seawater

High Sensitivity Continuous Monitoring of Chloroform Gas by Using Wavelength Modulation Photoacoustic Spectroscopy in the Near-Infrared Range

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Cavity Ring-Down Spectroscopy: Recent Technological Advancements, Techniques, and Applications

Cited by 63 publications

References 227 publications

Temperature Dependence of the Collision‐Induced Absorption Band of O2 Near 1.27 µm

Temperature Dependence of the Collision‐Induced Absorption Band of O2 Near 1.27 µm

A Fiber-Integrated CRDS Sensor for In-Situ Measurement of Dissolved Carbon Dioxide in Seawater

High Sensitivity Continuous Monitoring of Chloroform Gas by Using Wavelength Modulation Photoacoustic Spectroscopy in the Near-Infrared Range

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Temperature Dependence of the Collision‐Induced Absorption Band of O₂ Near 1.27 µm

Temperature Dependence of the Collision‐Induced Absorption Band of O₂ Near 1.27 µm