Xi'an Jiaotong University

Suzhou Nuclear Powerresearch Institute Co., Ltd

Northwest Institute of Nuclear Technology

Xingwen Li

Jian Wu

Yuhua Hang

Zhi Zhang

Yan Qiu

Wei Wang

Tao Liu

Fei Xue

Zhiyuan Jiang

Li Chen

Zhiguo Wang

Yu Meng

Jiahui Yin

Xiaofeng Jiang

Xinmiao Zhou

Ziwei Chen

Huantong Shi

Aici Qiu

Ying Zhou

Hongyu Jiang

Cuixiang Pei

Mingxin Shi

Zhenyu Wang

Penghui Li

Fengju Sun

Silei Chen

The present disclosure discloses an optical measurement device and method for a plasma magnetic field with adjustable sensitivity. The method comprises the following steps: constructing an optical rotation measurement system based on a pulsed laser beam for measuring an optical rotation image and a shadow image; processing the optical rotation image and the shadow image, and obtaining a distribution of proportional coefficients based on alight intensity distribution; obtaining a distribution of rotation angles based on a mapping relationship between the proportional coefficients and the rotation angles; constructing an interference measurement system based on the pulsed laser beam, and measuring a phase shift of an interference image; calculating a distribution of electron areal densities based on the phase shift in the interference image; obtaining a two-dimensional distribution of an average magnetic field based on the rotation angles and the electron areal densities.

Optical measuring device and method for plasma magnetic field with adjustable sensitivity

The present disclosure discloses a stress and shock wave diagnosis fused LIBS optimization system and method, including: collecting a shock wave signal, a stress wave signal and a spectral signal of a detected object subjected to pulsed laser ablation under the current parameter; pre-processing the spectral signal to obtain a spectral intensity of the detected object under the current parameter; processing the shock wave signal and the stress wave signal to obtain a shock wave intensity and a stress wave intensity under the current parameter; adjusting optimization variables until optimization measurement and diagnosis of a spectral enhancement measure or system parameter are completed. Information on other two dimensions is added for an optimization process; and proportions of shock wave propagation in incident laser energy and mechanical stress propagation in a target can be intuitively recognized, so that the scientificity and persuasiveness of an optimization result are improved.

Stress and shock wave diagnosis fused LIBS optimization system and method

An arc fault detection method for a photovoltaic system based on an adaptive kernel function and instantaneous frequency estimation includes steps of: sampling signal xin a time window length of Tand obtaining an iterative time-frequency diagram of xby nonlinear chirplet transform; extracting detection variables based on frequency component in the selected iterative time-frequency diagram to determine a moment when spectrum energy increases; when the moment is found, obtaining a matrix distribution form of the xin time-frequency domain obtained by the adaptive optimum kernel time-frequency representation, and processing the matrix with sum of squares in a time dimension to obtain a column vector; processing each selected frequency bands with integration operation in a frequency dimension to obtain multiple detection variable values as inputs of a well-trained Naive Bayes model.

Arc fault detection method for photovoltaic system based on adaptive kernel function and instantaneous frequency estimation

An optical fiber laser induced breakdown spectroscopy detection device and a detection method are provided. The device comprises an optical fiber LIBS detector and a master control detection system. The master control detection system is installed in the master control room of a nuclear power plant, and the optical fiber LIBS detector is configured to perform detection in a pipeline. The master control detection system and the optical fiber LIBS detector are connected to each other via the transmission optical fiber and the control signal line. The remote on-line detection of the positioning and fixed point of the designated area of the inner wall of the main pipeline of the nuclear power plant can be detected on line in the master control room of the nuclear power plant.

Optical fiber laser induced breakdown spectroscopy detection device and method

Provided is a gas switch triggered by an optical pulse introduced by an optical fiber, which solves the problem of the existing electrically-triggered gas switch and laser-triggered gas having a complicated trigger system, being insufficiently reliable and having a higher cost due to the pulse amplitude/laser beam energy having higher requirements. The gas switch triggered by an optical pulse introduced by an optical fiber includes at least one trigger gap and one self-breakdown gap; each trigger gap is connected in parallel to a photoconductive switch, and an optical fiber is correspondingly provided for introducing an optical pulse for triggering. In the present disclosure, the advantages of a low trigger requirement of a photoconductive switch and a high voltage and large conduction current of a gas switch are fully utilized, and an optical pulse introduced by an optical fiber is used to trigger the photoconductive switch, so that the gas switch can be controlled and triggered under the action of a low-energy optical pulse (which can be less than 200 &#x3bc;J) transmitted by optical fiber, thereby greatly simplifying the scale and complexity of the trigger system and promoting the development and application of the pulse power supply technology.

Gas switch triggered by optical pulse introduced by optical fiber

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Xi'an, China

Xingwen Li