Research of High Sensitivity Cavity Ring-Down Spectroscopy Technology and Its Application

Wenqing, 刘文清 Liu; Xingping, 王兴平 Wang; Guosheng, 马国盛 Ma; Ying, 刘英 Liu; Zhihao, 赵之豪 Zhao; Xiang, 李想 Li; Hao, 邓昊 Deng; Bing, 陈兵 Chen; Ruifeng, 阚瑞峰 Kan

doi:10.3788/aos202141.0130003

Cited by 6 publications

(2 citation statements)

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“…In addition, the relative error 0    of the decay time also directly determines the sensitivity of CRDS. 0    is related to factors such as the linewidth of the laser, detector noise level, sampling accuracy of the acquisition card, precision of the optical resonant cavity, and temperature stability [21] .…”

Section: Uncertainty Evaluationmentioning

confidence: 99%

The Uncertainty Evaluation of Determining the Trace H₂S in SF₆/N₂ Insulating Gas Mixture by Cavity Ring-Down Spectroscopy

Gao,

Zhu,

Zhang

2024

J. Phys.: Conf. Ser.

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H2S is one of the most important characteristic components of sulfur hexafluoride gas insulated electrical equipment. The detection of trace H2S is of great significance for early fault diagnosis of such equipment. Based on the 1578 nm wavelength distributed feedback diode laser (DFB-DL), cavity ring-down spectroscopy (CRDS) can effectively measure the concentration of trace H2S in SF6/N2 gas mixtures. Starting from the principle of methodology, this article establishes a mathematical model for evaluating the measurement uncertainty of CRDS and analyzes its sources of uncertainty: gas constant R1 , temperature T, Avogadro constant NA , gas pressure p in the optical cavity, volume V of the optical cavity, speed c of light, the absorption cross-section parameter σ(ν) of H2S molecules in the laser frequency ν, the ring-down time τ with absorption sample H2S and the ring-down time τ0 without absorption sample. After evaluating the uncertainty components, it was found that the main component was σ(ν) and the secondary components were τ and τ0. The H2S content in the 80% SF6-20% N2 mixed gas measured is (7.64 ± 0.12) × 10−6 mol/mol.

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Section: Uncertainty Evaluationmentioning

confidence: 99%

The Uncertainty Evaluation of Determining the Trace H₂S in SF₆/N₂ Insulating Gas Mixture by Cavity Ring-Down Spectroscopy

Gao,

Zhu,

Zhang

2024

J. Phys.: Conf. Ser.

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“…Therefore, the requirements of higher accuracy and better real-time performance are put forward to improving the measurement system. It is very meaningful when applied to the cavity ring-down spectroscopy to detect trace gases, and can more accurately reflect the change of the measured gas concentration in the ring-down cavity [12,13,14,15,16]. In the measurement of the resonant cavity loss, the resonant cavity can be adjusted in real-time, which can reduce the loss of the resonant cavity and improve the yield and excellent rate of the resonant cavity efficiently [17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Real-time processing system for cavity ring down signal based on ZYNQ chip

Ouyang

Zhang

et al. 2022

IEICE Electron. Express

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Research on single-point fast three-dimensional concentration reconstruction of a smoke plume based on the static interference infrared imaging spectroscopy system

Sheng,

Zhao,

Zheng

et al. 2024

Opt. Express

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To meet the requirements of real-time and effectiveness of three-dimensional concentration telemetry of gas clouds and address the difficulty of fast three-dimensional concentration reconstruction of single instrument smoke plumes, the paper proposes a single-point fast three-dimensional concentration reconstruction of the smoke plume based on a static interference infrared Fourier transform imaging spectrometer (ISIFTS) by using the advantages of high throughput, large field of view, high stability, and rapid detection. Based on the scanning field switching characteristics of ISIFTS, a single instrument quickly scans the dual-field map data to obtain the three-dimensional point cloud of the target scene. Combined with the three-dimensional spatial parameters of the scene, a multi-dimensional re-projection algorithm is constructed based on the Gaussian plume continuous diffusion model to simulate the concentration-path-length product (CL) image, and the measured CL image is solved by analyzing the smoke plume image spectra data. The normalized cross-correlation fitting algorithm is used to perform the optimal matching of simulated-measured CL images, and then the three-dimensional concentration distribution of the plume scene is reconstructed based on the dimension mapping relationship. The field smoke plume telemetry experiment was designed and carried out, and the three-dimensional concentration distribution of plume gas at three emission points in the scene was obtained. The CO2 emission rates were calculated to be 13.572 kg / s, 12.225 kg / s, and 14.114 kg / s, respectively. The data are consistent with the emission rate of the coal-fired thermal power plant, which verifies the effectiveness of the single-point fast three-dimensional concentration reconstruction of the smoke plume method based on the ISIFTS system.

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Research of High Sensitivity Cavity Ring-Down Spectroscopy Technology and Its Application

Cited by 6 publications

References 0 publications

The Uncertainty Evaluation of Determining the Trace H₂S in SF₆/N₂ Insulating Gas Mixture by Cavity Ring-Down Spectroscopy

The Uncertainty Evaluation of Determining the Trace H₂S in SF₆/N₂ Insulating Gas Mixture by Cavity Ring-Down Spectroscopy

Real-time processing system for cavity ring down signal based on ZYNQ chip

Research on single-point fast three-dimensional concentration reconstruction of a smoke plume based on the static interference infrared imaging spectroscopy system

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Research of High Sensitivity Cavity Ring-Down Spectroscopy Technology and Its Application

Cited by 6 publications

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The Uncertainty Evaluation of Determining the Trace H2S in SF6/N2 Insulating Gas Mixture by Cavity Ring-Down Spectroscopy

The Uncertainty Evaluation of Determining the Trace H2S in SF6/N2 Insulating Gas Mixture by Cavity Ring-Down Spectroscopy

Real-time processing system for cavity ring down signal based on ZYNQ chip

Research on single-point fast three-dimensional concentration reconstruction of a smoke plume based on the static interference infrared imaging spectroscopy system

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The Uncertainty Evaluation of Determining the Trace H₂S in SF₆/N₂ Insulating Gas Mixture by Cavity Ring-Down Spectroscopy

The Uncertainty Evaluation of Determining the Trace H₂S in SF₆/N₂ Insulating Gas Mixture by Cavity Ring-Down Spectroscopy