- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2019 IEEE 2nd Ukraine Conference on Electrical and Computer Engineering (UKRCON) - Lviv, Ukraine (2019.7.2-2019.7.6)] 2019 IEEE 2nd Ukraine Conference on Electrical and Computer Engineering (UKRCON) - Retrievieng the Surface Relief of the Smooth Objects by the Digital Holography
摘要： A new method for the surface relief study using digital holography is presented. This method includes an approach for digital refocusing and elimination of optical aberrations. Experimental study of the standard roughness sample allowed estimation of the error of the proposed method. The practical application for solving real tasks of materials science is shown.
关键词： aberration elimination,Digital holography,surface relief,digital refocusing,nondestructive testing
更新于2025-09-12 10:27:22
-
Broadband Laser Ultrasonic Excitation and Multi-band Sensing for Hierarchical Automatic Damage Visualization
摘要： It is well known that the selection of a frequency for signal generation and data acquisition signi?cantly affects the quality of ultrasonic or laser ultrasonic nondestructive testing (NDT) results, and the analog ?lter is essential to prevent the aliasing effect. This paper presents a systematic approach using a hierarchical inspection scheme for automatic inspection processes. A frequency band divider (FBD) with a single-input–multiple-output (SIMO) system was newly created to examine quickly various frequency ranges at single scanning using laser-based broadband excitation. The FBD was implemented into a pulse-echo ultrasonic propagation imaging (PE UPI) system capable of fully noncontact laser ultrasonic inspection. Only two scans are required to determine the optimal frequency range for unknown specimens. This tremendously reduces the number of scanning trials for the investigation of complete frequency ranges.
关键词： Nondestructive testing,Programmable band-pass ?lter,Pulse-echo ultrasonic propagation imager,Hierarchical approach
更新于2025-09-11 14:15:04
-
Intelligent classification of silicon photovoltaic cell defects based on eddy current thermography and convolution neural network
摘要： Defects the production process of silicon photovoltaic (Si-PV) cells are urgently needed to be detected due to their serious impact on the normal generation of PV system. In view of the shortcomings such as low defect efficiency, few detection data and high detection error rate in the existing industrial production line, the main research purpose of this study is to complete an intelligent classification method for efficient and innovative defect detection for Si-PV cells and modules. The purpose is to improve the detection efficiency of Si-PV cell, to ensure the safety and reliability of Si-PV cell production process, to achieve large number of Si-PV cell defects detection and classification. Firstly, the Eddy Current Thermography (ECT) system of Si-PV cells was established. Secondly, Principal Component Analysis (PCA), Independent Component Analysis (ICA) and Non-negative Matrix Factorization (NMF) algorithms are compared for thermography sequences processing. Thirdly, LeNet-5, VGG-16 and GoogleNet models are compared for Si-PV cell defects classification. Finally, the results showed that the proposed method have successful application in Si-PV cell defects detection and classification.
关键词： Nondestructive testing & evaluation,Defect feature extraction,Defect classification,Convolution neural network,Silicon photovoltaic cell,Eddy current thermography
更新于2025-09-11 14:15:04
-
[IEEE 2018 IEEE ISAF-FMA-AMF-AMEC-PFM Joint Conference (IFAAP) - Hiroshima (2018.5.27-2018.6.1)] 2018 IEEE ISAF-FMA-AMF-AMEC-PFM Joint Conference (IFAAP) - Bi<inf>4</inf>Ti<inf>3</inf>O<inf>12</inf>/SrTiO<inf>3</inf>Sol-Gel Composite for Ultrasonic Transducers
摘要： In this study, lead-free new sol-gel composite, Bi4Ti3O12(BiT)/SrTiO3(ST) was developed. 100μm thick films were fabricated on 3mm thick titanium substrates by sol-gel spray technique. Polarization process was carried out at room temperature and 400°C. Samples were set onto a hot plate and ultrasonic response in pulse-echo mode was recorded by a digital oscilloscope from room temperature to 500°C. As a result, each samples showed reflected wave at 500°C. Therefore, BiT/ST sol-gel composite have high temperature endurance up to 500°C. In addition, BiT/ST films was able to polarize at room temperature.
关键词： ultrasonic transducer,high temperature,nondestructive testing,sol-gel composite
更新于2025-09-10 09:29:36
-
Nondestructive testing of advanced materials using sensors with metamaterials
摘要： This work presents a method for nondestructive evaluation (NDE) of advanced materials that makes use of the images in near field and the concentration of flux using the phenomenon of spatial resolution. The method allows the detection of flaws as crack, non-adhesion of coating, degradation or presence delamination stresses correlated with the response of electromagnetic sensor.
关键词： advanced materials,sensors,metamaterials,nondestructive testing
更新于2025-09-10 09:29:36
-
Nondestructive Testing for Archaeology and Cultural Heritage (A Practical Guide and New Perspectives) || Nondestructive Testing Technologies for Cultural Heritage: Overview
摘要： In this chapter, the most used NDT geophysical technologies applied in the field of preventive archaeology and in the analysis of monumental heritage will be considered. Starting from the current state of the art, we will examine: Ground-Penetrating Radar (GPR), electrical active (Electrical Resistivity Tomography—ERT; induced polarization—IP) and passive (Self-Potential—SP), and seismic sonic an ultrasonic methods. Here some important theoretical aspect will be explained as simply as possible, also using practical examples.
关键词： Monumental Heritage,Preventive Archaeology,Induced Polarization,Electrical Resistivity Tomography,Geophysical Technologies,Seismic Sonic,Self-Potential,Ground-Penetrating Radar,Nondestructive Testing,Ultrasonic Methods
更新于2025-09-09 09:28:46