A5074305395- Thermography and Photoacoustic Techniques
- Photoacoustic and Ultrasonic Imaging
- Ultrasonics and Acoustic Wave Propagation
- High voltage insulation and dielectric phenomena
- Calibration and Measurement Techniques
- Magneto-Optical Properties and Applications
- Thermal properties of materials
- Advanced Sensor and Control Systems
- Fire effects on concrete materials
- Infrared Target Detection Methodologies
- Laser Material Processing Techniques
- Gear and Bearing Dynamics Analysis
- Silicon and Solar Cell Technologies
- Spectroscopy and Chemometric Analyses
- Power Transformer Diagnostics and Insulation
- Electrostatic Discharge in Electronics
- Image Enhancement Techniques
- Non-Invasive Vital Sign Monitoring
- Machine Fault Diagnosis Techniques
- Advanced Fiber Optic Sensors
- Optical Systems and Laser Technology
- Engineering Diagnostics and Reliability
- Optical measurement and interference techniques
- Lightning and Electromagnetic Phenomena
- Elevator Systems and Control
Shandong Academy of Sciences
2020-2024
Qilu University of Technology
2020-2024
Institute of Oceanographic Instrumentation
2020-2024
Harbin Institute of Technology
2013-2016
In this article, a bidirectional thermal wave radar thermography (BTWRT) is used for the inspection of hybrid carbon/glass fiber reinforced polymer (C/GFRP) laminates with subsurface defects, and reliability BTWRT deeply investigated based on probability detection (POD) analysis. Three classes C/GFRP are prepared experimental study, volume ratio glass carbon 1:4, 1:1, 4:1, respectively. Each class laminate includes total 72 artificial flat-bottom holes different diameter-to-depth ratios. An...
Abstract The accuracy of wind turbine gearbox fault diagnosis will be compromised if the feature data is not adequately extracted during operation. To enhance identification efficiency and mitigate human interference in parameter setting, this paper introduces an optimized mode decomposition algorithm OCSSA-VMD, derived from variational (VMD) further by osprey-Cauchy-sparrow search (OCSSA). This offers two key advantages: (1) automatic optimization parameters such as number modes k penalty...
The most common fault in GIS is the partial discharge of insulator before full breakdown. On-line monitoring uhf an effective means monitoring. anti-jamming performance system at present time poor, false positives, non-response rates higher problem. We design a set intelligent and diagnosis system. In order to improve accuracy test, need calibrate sensor. Then UHF electromagnetic wave radiated by equipment monitored sensors, data transmitted expert database analysis real Ethernet...
An analytic mathematical model of modulated laser-induced minority carrier density wave silicon solar cells is developed, and light-induced recombination radiation luminescence method (photocarrier radiometry (PCR)) employed to detect the doping concentration, impedance transport parameters. The double knee characteristics frequency domain response curve are investigated, in a small ac signal case, equivalent circuit topology structure cell constructed. Through simulation analysis based on...
The measurable electric field of the partial discharge ultra-high-frequency (PD UHF) detection system calibrated by a gigahertz transverse electromagnetic cell (GTEM) has been used as key indicator to evaluate performance and regarded power standard. In this study, sweep frequency pulse signal were injected GTEM cell, then waveform amplitude strength calculated using transfer function voltage response monopole antennas. case frequency, comparing measured result Narda metre antennas, error...
Ultra-high frequency (UHF) partial discharge detection systems have broad application prospect in fault diagnosis of GIS, transformers and cables. Sensitivity is an important parameter UHF systems. Standard device-monoconical transverse electromagnetic cell (TEM) established for sensitivity calibration with standard calculated electric field. The six are calibrated labs, whose results accordance the field test verification. indicate that TEM a possible solution
In this paper, a novel approach combining image enhancement and improved Canny-based edge detection for the thermal wave radar imaging (TWRI) was proposed to identify internal delamination defect in carbon fiber reinforced polymer (CFRP) components. Experimental testing on artificial CFRP defects carried out. The fused method is used identification. An algorithm firstly improve contrast of image. adaptive Gaussian filter subsequently selected smooth suppressing effect noise, Sobel operator...
Ultraviolet radiation produced by corona discharge can be used for diagnosis, but the ultraviolet imager is expensive and signal susceptible to external interference during day, so it not accurately identify occurrence of discharge. In this paper, an optical lens designed collect signal. a detection method based on sensor was proposed. The design concentrate as suppress presented. By carrying out insulator experiments, feasibility proposed studied. Finally, comparison verification made with...