Cavity-enhanced Raman spectroscopy with optical feedback frequency-locking for gas sensing

Wang, Pinyi; Chen, Weigen; Wan, Fu; Wang, Jianxin; Hu, Jin

doi:10.1364/oe.27.033312

Cited by 37 publications

(39 citation statements)

References 46 publications

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“…According to the noise intensity of the three sets of spectra, the detection limits of the spectral data with the noise intensity of the collected signals at 45 degrees, 90 degrees and 135 degrees are 37.4, 40.7 and 37.0, respectively, and the detection limits are 116.9. ppm, 138.8 ppm and 93.3 ppm. Compared with the results of a previous report (16 ppm) [ 22 ], the LOD of this study was not prominent. This was mainly due to the different components of this setup and the different acquisition parameters.…”

Section: Resultscontrasting

confidence: 98%

“…Li et al have reported an LOD of 16 ppm for CO 2 based on a near-confocal cavity [ 21 ]. Wang et al achieved an LOD of 17.4 ppm for CO 2 with the optical feedback frequency locking method [ 22 ]. Because of the various components (different detectors and lasers) and different acquisition parameters (integration times and number of accumulations), the LOD of each setup was different.…”

Section: Introductionmentioning

confidence: 99%

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Cavity Enhanced Multi-Channels Gases Raman Spectrometer

Yang

Liu

Guo

et al. 2021

Sensors

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Raman spectroscopy has the advantages of multi-component detection, with a simple device and wide concentration ranges, and it has been applied in environmental monitoring and gas logging. However, its low sensitivity has limited its further applications. In fact, the Raman signal is not weak, but the utilization efficiency of the Raman signal is low, and most of the signal is wasted. Given this, in this paper we report a cavity-enhanced multi-channel gas Raman spectrometer with an eight-sided cuvette. First, we simulated the Raman scattering intensity at angles from 30 degrees to 150 degrees. The simulation results showed that the signal intensity at an angle of 45° is 1.4 times that observed at 90°. Based on the simulation results, we designed a three-channel sample cell for higher sensitivity. The results of these experiments showed that the sensitivity could be increased by adding all signal together, and the limit of detection (LOD) for CO2 was 75 ppm, which is better than that of each channel. This paper thus presents a new method to enhance the Raman signal, which can be used in field applications.

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Section: Resultscontrasting

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Cavity Enhanced Multi-Channels Gases Raman Spectrometer

Yang

Liu

Guo

et al. 2021

Sensors

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“…Moreover, there is an excellent linear relationship between Raman peak intensity and gas concentration in a wide range, as shown in Fig. 7, which also is demonstrated in our recent work [74]. It indicates that the high-precision quantitative analysis of gas concentration based on Raman spectroscopy is feasible.…”

Section: Raman Spectroscopy-based Fibre Gas Sensorsupporting

confidence: 79%

“…Different peak positions (Raman shifts) represent different gas components and the scattering intensity indicates the gas concentration Fig. 7 Raman scattering intensity of CO 2 with a series of concentrations, which is detected by a cavity-enhanced Raman spectroscopy trace gases detection system (more details are presented in our research work [74,75]). The linearity between scattering intensity and the gas concentration is excellent, and the coefficient of determination R 2 caused by vibration or ultrasonic, thus leading to a change in the phase between two reflected light which interfere with each other in fibre and then the phase change is converted into intensity change.…”

Section: Oi-based Fibre Vibration and Ultrasonic Sensormentioning

confidence: 99%

“… Raman scattering intensity of CO 2 with a series of concentrations, which is detected by a cavity‐enhanced Raman spectroscopy trace gases detection system (more details are presented in our research work [74, 75]). The linearity between scattering intensity and the gas concentration is excellent, and the coefficient of determination R 2 = 0.99988 …”

Section: Review On Optical Fibre Sensors For Electrical Equipment Cmentioning

confidence: 99%

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Review of optical fibre sensors for electrical equipment characteristic state parameters detection

et al. 2019

Self Cite

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Optical fibre sensing technology is a powerful method for long-term reliable sensing in harsh environments, which means it is particularly suitable for the detection of electrical equipment characteristic state parameters, including characteristic gases, abnormal vibration, ultrasonic produced by partial discharge, and abnormal temperature rise. This paper reviews several individual optical fibre sensors for different state parameters detection, discusses the advantages, limitations and possible improvement methods, and finally presents the most promising optical fibre sensor for each state parameter.

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Quantitative acetone/toluene planar laser‐induced fluorescence measurements of equivalent ratio

Chang,

Yu,

Peng

et al. 2024

Micro & Optical Tech Letters

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In this work, we establish a quantitative relationship between the fluorescence signal intensity of acetone and toluene and their concentration, and acetone/toluene planar laser‐induced fluorescence (PLIF) is developed to measure the concentrations of two components simultaneously, providing an equivalent ratio distribution of the flow field. Due to a thorough consideration of the tracer effect on each other's fluorescence signals, the uncertainty in the PLIF concentration measurement is reduced to 10.4%. Experimental results of OH‐PLIF and acetone/toluene PLIF indicate that the equivalence ratio distribution obtained by acetone/toluene PLIF in cold‐state flow fields can be employed to predict and analyze the trend of equivalence ratio distribution in the combustion field.

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Cavity-enhanced Raman spectroscopy with optical feedback frequency-locking for gas sensing

Cited by 37 publications

References 46 publications

Cavity Enhanced Multi-Channels Gases Raman Spectrometer

Cavity Enhanced Multi-Channels Gases Raman Spectrometer

Review of optical fibre sensors for electrical equipment characteristic state parameters detection

Quantitative acetone/toluene planar laser‐induced fluorescence measurements of equivalent ratio

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