VIS-NIR Full-Field Low Coherence Interferometer for Surface Layers Non-destructive Testing and Defects Detection

Fringe 2013 ◽  
2014 ◽  
pp. 925-928 ◽  
Author(s):  
Leszek Salbut ◽  
Slawomir Tomczewski ◽  
Anna Pakula
Keyword(s):  
Non Destructive Testing ◽  
Surface Layers ◽  
Destructive Testing ◽  
Full Field ◽  
Low Coherence ◽  
Non Destructive

scholarly journals A Versatile Illumination System for Real-Time Terahertz Imaging

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3993
Author(s):  
Jean-Baptiste Perraud ◽  
Adrien Chopard ◽  
Jean-Paul Guillet ◽  
Pierre Gellie ◽  
Antoine Vuillot ◽  
...  
Keyword(s):  
Real Time ◽  
Signal To Noise Ratio ◽  
Beam Steering ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Full Field ◽  
Illumination System ◽  
Optimized Distribution ◽  
Non Destructive ◽  
Field Imaging

Terahertz technologies are attracting strong interest from high-end industrial fields, and particularly for non-destructive-testing purposes. Currently lacking compactness, integrability as well as adaptability for those implementations, the development and commercialisation of more efficient sources and detectors progressively ensure the transition toward applicative implementations, especially for real-time full-field imaging. In this work, a flexible illumination system, based on fast beam steering has been developed and characterized. Its primary goal is to suppress interferences induced by the coherence length of certain terahertz sources, spoiling terahertz images. The second goal is to ensure an enhanced signal-to-noise ratio on the detector side by the full use and optimized distribution of the available power. This system provides a homogeneous and adjustable illumination through a simplified setup to guarantee optimum real-time imaging capabilities, tailored to the sample under inspection. Working toward industrial implementations, different illumination process are conveniently assessed as a result of the versatility of this method.

scholarly journals Insights into Acoustically Induced PiezoLuminescence: The Visualization of Ultrasonic Beam Patterns

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 491
Author(s):  
Simon Michels ◽  
Mathias Kersemans ◽  
Guillaume Lajoinie ◽  
Michel Versluis ◽  
Philippe F. Smet
Keyword(s):  
Ultrasonic Transducers ◽  
Non Destructive Testing ◽  
Ultrasonic Beam ◽  
Destructive Testing ◽  
Full Field ◽  
Ultrasound Field ◽  
Non Destructive ◽  
Beam Patterns ◽  
Ultrasonic Investigation

Ultrasonic transducers are used in many fields of application, including medical imaging/treatment, non-destructive testing and material characterization. To assure the quality of the ultrasonic investigation transducers require regular checks for possible deterioration and accurate calibration. Current methods rely on point-by-point scanning of the ultrasound field with a needle hydrophone, which is expensive and time consuming. Recently, we have developed a new concept, in which a fast full-field visualization of the radiation field is achieved through Acoustically induced PiezoLuminescence (APL). Here, we report on an improved ultrasonic beam visualization and provide further insights into the mechanism underlying APL and mechanoluminescence.

scholarly journals The Selected Measurement Problems in the Aspect of the Non-Destructive Testing of the Gear Wheels and the other Parts

2014 ◽  
Vol 14 (4) ◽  
pp. 92-101
Author(s):  
S. Jończyk ◽  
T. Babul ◽  
S. Włodarczyk
Keyword(s):  
Heat Treatment ◽  
The Other ◽  
Non Destructive Testing ◽  
Surface Layers ◽  
Destructive Testing ◽  
Stress Changes ◽  
Different Depths ◽  
Gear Wheels ◽  
Local Defects ◽  
Non Destructive

Abstract This paper presents an overview of the results of studies which, in addition to the detection of differences in the structure of the product and the thickness of the surface layers, aimed to diversify the signal from the stress changes caused by cracks, assess local defects in the microstructure deformed by heat treatment and detect hydrogen „in statu nascendi”. Measurements were performed using Wirotest 1000. Specialized probes were used to allow measurements on surfaces difficult to reach. Measurements were taken at different depths of penetration. Assessment of the correlation of eddy current measurements and microhardness was also performed.

QUANTITATIVE NON-DESTRUCTIVE TESTING OF STRESSES IN SURFACE LAYERS BY MEANS OF BARKHAUSEN EFFECT METHOD

1992 ◽  
pp. 729-734
Author(s):  
V.L. Vengrinovich ◽  
V.N. Busko ◽  
E.A. Volchkova ◽  
M.S. Vysotsky ◽  
N.Yn. Shveev
Keyword(s):  
Non Destructive Testing ◽  
Barkhausen Effect ◽  
Surface Layers ◽  
Destructive Testing ◽  
Non Destructive ◽  
Effect Method

Digital holographic camera with extended stochastic illumination for non-destructive inspection of silicon optics

2021 ◽  
Author(s):  
Gaurav Dwivedi ◽  
Lavlesh Pensia ◽  
Sanjit K Debnath ◽  
Raj Kumar
Keyword(s):  
Random Phase ◽  
Research Work ◽  
Numerical Control ◽  
Non Destructive Testing ◽  
Cnc Machine ◽  
Destructive Testing ◽  
Full Field ◽  
Specular Surface ◽  
Silicon Optics ◽  
Non Destructive

Abstract In present work, we propose a compact digital holographic camera with extended stochastic illumination for full-field non-destructive inspection of silicon optics fabricated in computerized numerical control (CNC) machine. The developed technique overcomes the limitation of digital holography imparted by definite size of active area of the recording sensor to image a specular surface. The original aspect of this research work is to develop a system that enables reconstruction and testing of specular surface. For this a dual diffuser configuration is incorporated in a compact digital holographic camera developed for non-destructive testing applications. The generation of stochastic illumination beam using the diffusers is explained by simulating propagation of a light beam through random phase function of scattering medium. The stochastic optical field produced by the combination of diffusers in the digital holographic camera makes the camera suitable for non-destructive testing of specular surface of silicon optics. The effect of number of diffusers, and their relative positions on imaging area of specular object is studied for development of an optimized configuration of digital holographic camera. Applicability of proposed scheme is demonstrated through detection of defects in silicon optics using digital holographic interferometry.

Non destructive testing of works of art by terahertz analysis

2013 ◽  
Vol 64 (2) ◽  
pp. 21001 ◽  
Author(s):  
Jean-Luc Bodnar ◽  
Jean-Jacques Metayer ◽  
Kamel Mouhoubi ◽  
Vincent Detalle
Keyword(s):  
Non Destructive Testing ◽  
Destructive Testing ◽  
Works Of Art ◽  
Non Destructive
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