Ultrasonic characterization of materials by means of under water Laser Doppler Vibrometer measurements of continuous waves

2010 ◽  
Author(s):  
Roberto Longo ◽  
Gunther Steenackers ◽  
Steve Vanlanduit ◽  
Patrick Guillaume ◽  
E. P. Tomasini
Keyword(s):  
Laser Doppler Vibrometer ◽  
Laser Doppler ◽  
Ultrasonic Characterization ◽  
Continuous Waves ◽  
Characterization Of Materials

scholarly journals Characterization of laser Doppler vibrometers using acousto-optic modulators

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 361
Author(s):  
Michael Gaitan ◽  
Jon Geist ◽  
Benjamin J. Reschovsky ◽  
Ako Chijioke
Keyword(s):  
Frequency Shift ◽  
Excitation Frequency ◽  
Laser Doppler Vibrometer ◽  
Laser Doppler ◽  
New Approach ◽  
Frequency Reference ◽  
Discrete Velocity ◽  
Velocity Shift ◽  
Vibration Excitation

We report on a new approach to characterize the performance of a laser Doppler vibrometer (LDV). The method uses two acousto-optic modulators (AOMs) to frequency shift the light from an LDV by a known quantity to create a synthetic velocity shift that is traceable to a frequency reference. Results are presented for discrete velocity shifts and for sinusoidal velocity shifts that would be equivalent to what would be observed in an ideal accelerometer vibration calibration. The method also enables the user to sweep the synthetic vibration excitation frequency to characterize the bandwidth of an LDV together with its associated electronics.

Laser Doppler vibrometer and bending wave based dynamic material characterization of organic aerogel panels

2019 ◽  
Vol 145 (3) ◽  
pp. 1824-1824
Author(s):  
Max Miller ◽  
Sadeq Malakooti ◽  
Ning Xiang ◽  
Nicholas Leventis ◽  
Hongbing Lu
Keyword(s):  
Material Characterization ◽  
Laser Doppler Vibrometer ◽  
Laser Doppler ◽  
Organic Aerogel ◽  
Bending Wave

Guided Waves in Plates and Their Use in Materials Characterization

1997 ◽  
Vol 50 (5) ◽  
pp. 247-284 ◽  
Author(s):  
D. E. Chimenti
Keyword(s):  
Guided Waves ◽  
Large Body ◽  
Review Article ◽  
Guided Wave ◽  
Materials Characterization ◽  
Current State ◽  
Ultrasonic Characterization ◽  
Characterization Of Materials ◽  
Wave Methods

In this review article, the ultrasonic characterization of materials using guided plate waves and their usage to elucidate mechanical properties of plate-like structures is reviewed. The purpose here is to summarize and explain the large body of theoretical and experimental work in this developing field. It is also to gain a perspective on recent salient contributions and to analyze the current state of knowledge and practice in guided wave ultrasonics. Models of waves in plates are examined, as are the means to generate and detect them. Their application to several problems of current interest in materials characterization is treated in detail. In particular, composite materials and their inspection and characterization have been a major impetus in the development of guided wave methods. Techniques to inspect composites sensitively and reliably for defects and to probe their micromechanical behavior are a major focus of this article. Also considered are the characterization of adhesive bonds, the measurement of stress and texture, and the detection of defects using guided waves. This review article contains 362 references.

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