Design and industrial testing of ultra-fast multi-gas Raman spectrometer

Buric, Michael; Mullen, Jessica C.; Woodruff, Steven D.; Chorpening, Benjamin

doi:10.1117/12.2015948

Cited by 6 publications

(5 citation statements)

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“…To date, the accuracy, repeatability, and reliability of the system have been reported in other publications [7][8][9]. In accordance with those reports, we determined that the instrument generally has an approximately 0.1% accuracy when properly calibrated, with a similar repeatability provided that an appropriate background measurement and subtraction is performed once prior to taking gas measurements [10].…”

Section: Initial Supporting Measurementssupporting

confidence: 77%

“…Herein, we discussed necessary provisions for sample plumbing and system setup to perform such measurements in a realtime fashion. In other publications, we have addressed the accuracy, repeatability, and reliability of the system [7][8][9][10]. Here, we operated the RGA on a combustion system capable of easily producing transient composition responses without the threat of significant system damage during that transient operation.…”

Section: Discussionmentioning

confidence: 99%

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Fuel flexibility via real-time Raman fuel-gas analysis for turbine system control

et al. 2015

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The modern energy production base in the U.S. is increasingly incorporating opportunity fuels such as biogas, coalbed methane, coal syngas, solar-derived hydrogen, and others. In many cases, suppliers operate turbine-based generation systems to efficiently utilize these diverse fuels. Unfortunately, turbine engines are difficult to control given the varying energy content of these fuels, combined with the need for a backup natural gas supply to provide continuous operation. Here, we study the use of a specially designed Raman Gas Analyzer based on capillary waveguide technology with sub-second response time for turbine control applications. The NETL Raman Gas Analyzer utilizes a low-power visible pump laser, and a capillary waveguide gas-cell to integrate large spontaneous Raman signals, and fast gas-transfer piping to facilitate quick measurements of fuel-gas components. A U.S. Department of Energy turbine facility known as HYPER (hybrid performance system) serves as a platform for apriori fuel composition measurements for turbine speed or power control.A fuel-dilution system is used to simulate a compositional upset while simultaneously measuring the resultant fuel composition and turbine response functions in real-time. The feasibility and efficacy of system control using the spontaneous Raman-based measurement system is then explored with the goal of illustrating the ability to control a turbine system using available fuel composition as an input process variable.

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Section: Initial Supporting Measurementssupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Fuel flexibility via real-time Raman fuel-gas analysis for turbine system control

et al. 2015

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“…The above setup already incorporates several fluorescence reduction measures: caps covering the capillary ends block laser light from directly entering and fluorescence light from exiting the capillary wall face; a thin (thickness = 2 mm) high-purity fused silica cell window was used; and the number of optical components which are exposed to laser radiation, and which are within the collection cone for Raman light, was reduced compared to other direct-focusing capillary setups—such as the one described by Buric et al [ 10 ]—by placing the Raman collection lens behind the beam splitter instead of in front. A more detailed description of said fluorescence reduction steps can be found in James et al [ 11 ].…”

Section: Methodsmentioning

confidence: 99%

“…For example, Pearman et al reported up to 20-fold signal enhancements for a fiber-optic probe; they used an internally silver-coated glass capillary of 2 mm inner diameter as the gas cell [ 9 ]. For their direct-focusing metal-lined glass capillary setup, Buric et al achieved a 1σ detection limit of 0.12% for N 2 in air at atmospheric pressure, for a one-second measurement interval with a laser power of 150 mW [ 10 ]; this corresponds to a 3σ detection limit of 3.6 mbar. Recently, our group demonstrated the use of a capillary system—based on a metal-lined glass capillary of 650mm length—for dynamic, in situ process monitoring [ 11 ]; and in a system variant suitable for the analysis of tritium-containing, radioactive gases, we were able to detect hydrogen isotopologues with partial pressures of less than 0.5 mbar, for acquisition cycles of 50 × 0.1 s, i.e.…”

Section: Introductionmentioning

confidence: 99%

Improving the Detection Limit in a Capillary Raman System for In Situ Gas Analysis by Means of Fluorescence Reduction

Rupp

Off

Seitz-Moskaliuk

et al. 2015

Sensors

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Raman spectroscopy for low-pressure or trace gas analysis is rather challenging, in particular in process control applications requiring trace detection and real-time response; in general, enhancement techniques are required. One possible enhancement approach which enjoys increasing popularity makes use of an internally-reflective capillary as the gas cell. However, in the majority of cases, such capillary systems were often limited in their achievable sensitivity by a significant fluorescence background, which is generated as a consequence of interactions between the laser light and optical glass components in the setup. In order to understand and counteract these problems we have investigated a range of fluorescence-reducing measures, including the rearrangement of optical elements, and the replacement of glass components—including the capillary itself—by metal alternatives. These studies now have led to a capillary setup in which fluorescence is practically eliminated and substantial signal enhancement over standard Raman setups is achieved. With this improved (prototype) setup, detection limits of well below 1 mbar could be obtained in sub-second acquisition times, demonstrating the potential of capillary Raman spectroscopy for real-time, in situ gas sensing and process control applications, down to trace level concentrations.

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“…In parallel, the Raman spectroscopy offers advantages in multi-gas detection. In recent years, the Raman spectroscopy has become a potent tool for qualitative and quantitative analysis of critical gases [16][17][18][19][20][21][22][23][24][25][26][27]. Researchers have explored ways like harnessing more potent lasers or intensifying the interaction between laser beams and gas molecules to enhance the Raman signal.…”

Section: Introductionmentioning

confidence: 99%

Review on Hollow-Core Fiber Based Multi-Gas Sensing Using Raman Spectroscopy

Nie,

Liu,

Cheng

et al. 2024

Photonic Sens

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In recent years, detecting and quantifying multiple gases have garnered widespread attention across various fields, particularly in volatile organic compound (VOC) detection, which holds significant importance for ecosystems and the medical field. The Raman spectroscopy has been widely used in multi-gas detection due to its advantages in fast response speed and non-destructive detection. This paper reviews the latest research progress of the multi-gas sensing technology in the Raman spectroscopy, focusing on using the hollow-core fiber to enhance the gas signal intensity. The basic principles of the fiber-enhanced Raman spectroscopy are introduced. The detailed discussion includes the system architecture, parameter configuration, and experimental results. Then, the latest advances in the coherent anti-Stokes Raman scattering multi-gas detection technology are reviewed. Finally, the challenges faced by the hollow-core fiber in practical applications are discussed.

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Design and industrial testing of ultra-fast multi-gas Raman spectrometer

Cited by 6 publications

References 0 publications

Fuel flexibility via real-time Raman fuel-gas analysis for turbine system control

Fuel flexibility via real-time Raman fuel-gas analysis for turbine system control

Improving the Detection Limit in a Capillary Raman System for In Situ Gas Analysis by Means of Fluorescence Reduction

Review on Hollow-Core Fiber Based Multi-Gas Sensing Using Raman Spectroscopy

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