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wavelength calibration and spectral analysis of vacuum ultraviolet spectroscopy in EAST

Plasma Science and Technology 2024年第8期26卷 37-43页

作者：计华健张洪明吕波 Cheonho BAE 何梁林子超尹相辉沈永才戴舒宇 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China Science Island Branch Graduate SchoolUniversity of Science and Technology of ChinaHefei 230031People’s Republic of China College of Electrical Engineering University of South ChinaHengyang 421001People’s Republic of China School of Physics and Materials Engineering Hefei Normal UniversityHefei 230601People’s Republic of China School of Physics Dalian University of TechnologyDalian 116024People’s Republic of China

A vacuum ultraviolet(VUV)spectroscopy with a focal length of 1 m has been engineered specifically for observing edge impurity emissions in Experimental Advanced Superconducting Tokamak(EAST).In this study,wavelength calibration for the VUV spectroscopy is achieved utilizing a zinc *** grating angle and charge-coupled device(CCD)position are carefully calibrated for different wavelength *** wavelength calibration of the VUV spectroscopy is crucial for improving the accuracy of impurity spectral data,and is required to identify more impurity spectral lines for impurity transport *** spectra of EAST plasmas have also been obtained in the wavelength range of 50–300 nm with relatively high spectral *** is found that the impurity emissions in the edge region are still dominated by low-Z impurities,such as carbon,oxygen,and nitrogen,albeit with the application of fulltungsten divertors on the EAST tokamak.

关键词： vacuum ultraviolet spectroscopy wavelength calibration impurity spectra

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Gas Absorption Center-Based wavelength calibration Technique in QEPAS System for SNR Improvement

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Photonic Sensors 2018年第4期8卷 358-366页

作者： Zongliang WANG Jun CHANG Qi LIU Cunwei TIAN Qinduan ZHANG School of Physics Science and Information Technology and Shandong Key Laboratory of Optical CommunicationScience and Technology Liaocheng University Liaocheng 252000 China School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology andApplication Shandong University Jinan 250100 China

A simple and effective wavelength calibration scheme is proposed in a quartz enhanced photoacoustic spectroscopy （QEPAS） system for trace gas detection. A reference gas cell is connected an InGaAs photodetector for detecting the absorption intensity peak caused by the gas to calibrate the gas absorption center using distributed feedback laser diode （DFB-LD） with sawtooth wave driver current. The gas absorption wavelength calibration and gas sensing operations are conducted at a special internal to eliminate the wavelength shift of DFB-LD caused by the ambient fluctuations. Compared with the conventional wavelength modulation spectroscopy （WMS）, this method uses a lower lock-in amplifier bandwidth and averaging algorithm to improve signal noise ratio （SNR）. Water vapor is chosen as a sample gas to evaluate its performance. In the experiments, the impact of sawtooth wave frequency and lock-in amplifier bandwidth on the harmonic signal is analyzed, and the wavelength-calibration technique-based system achieves a minimum detection limit （MDL） of 790ppbv and SNR with 13.4 improvement factor compared with the conventional WMS system.

关键词： QEPAS DFB-LD wavelength calibration fiber gas sensor

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A wavelength calibration process for micro-spectrometers with multichannel detectors

A wavelength calibration process for micro-spectrometers wit...

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2007亚洲光电子会议先进传感与图象材料及器件分会场

作者： Xingyue Huang* Huaidong Yang Qingsheng He Guofan Jin Dept. of Precision Instruments and Mechanology Tsinghua Univ. Beijing P. R. China

An advanced wavelength calibration process with higher wavelength accuracy is developed based on the conventional calibration method of micro-spectrometers with multichannel detectors. The deficiencies of the conventional method in acquiring sufficient well-spaced and adequately accurate wavelength-pixel data for calibration are analyzed. And three steps are added to the conventional method before the final pixel-wavelength fit is carried out. First, segmented data collection is carried out to ensure sufficient well-spaced lines for calibration. Second, sub-pixel analysis is executed to increase sampling rate. Third, peak fit is implemented to acquire more accurate central wavelength positions. The simulated experiment was based on a compact spectrometer with a crossed Czerny-Turner optical design. Mercury and Argon line spectra are used as wavelength standards. A linear image sensor with 1024 pixels each 25μm in width is used as the detector. In the new calibration process the whole spectral region was divided into two segments with different integral time of the detector;the sampling rate was increased by 2 times by sub-pixel analysis;and log-normal function is applied in the peak fit. The results show that by applying the new method, the wavelength accuracy improves from above 1.0nm to around 0.6nm.

关键词： mirco-spectrometers wavelength calibration wavelength accuracy multichannel detectors segmented data collection sub-pixel analysis peak fit

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A New Method for Fiber Bragg Grating wavelength Demodulation with calibration

A New Method for Fiber Bragg Grating Wavelength Demodulation...

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20th Congress of the International Commission for Optics

作者： FU Jian-wei XIAO Li-zhi ZHANG Yuan-zhong ZHAO Xiao-liang CHEN Hai-feng China University of Petroleum Beijing China

A wavelength calibration method is proposed to improve Fiber Bragg Grating (FBG) wavelength detection precision. The reflected spectra of two reference FBG elements and a sensing FBG element are scann

关键词： FBG demodulation method wavelength calibration peak-seek method

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High-speed VUV spectroscopy for edge impurity line emission measurements in HL-2A tokamak

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Plasma Science and Technology 2018年第10期20卷 75-83页

作者： Dianlin ZHENG Kai ZHANG Zhengying CUI Ping SUN Chunfeng DONG Ping LU Bingzhong FU Zetian LIU Zhongbing SHI Qingwei YANG Southwestern Institute of Physics Chengdu 610041People＇s Republic of China

A 20 cm focal length normal incidence vacuum ultraviolet （VUV_20 cm） monochromator with a fast time response has been developed for measuring edge impurity line emission in the wavelength range of 300-2000 A on an HL-2A tokamak. An aberration corrected concave holographic grating with 1200 grooves/mm is adopted in the monochromator, which provides a wavelength dispersion of 40 A mm-1. The aperture is f/4.5. A channel electron multiplier is used as a detector. The time resolution of the system is 17 μs. wavelength calibration of the system has been done by using a hollow cathode light source in the laboratory with helium and argon gases. The obtained signals of helium and argon spectra are very strong since the inner surface of the monochromator vacuum chamber is blackened and the stray light level is then significantly reduced. The optical property of the system has been examined by scanning the width of the entrance and exit slits. The system is then installed at the mid-port of the HL-2A tokamak and typical line emissions from the HL-2A plasma are measured. Time behaviors of edge impurity line emissions are observed with the fast time response system in different plasma confinement regimes, especially in the H-mode discharges. The result shows that the VUV_20 cm system works very well to measure the edge impurity line emissions in the edge localized modes phase of H-mode discharges.

关键词： VUV monochromator CEM detector wavelength calibration impurity line emission H-mode plasmas

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