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Showing 1 to 8 of 8 for “"shearography"”.
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NONDESTRUCTIVE EVALUATION USING REAL-TIME SHEAROGRAPHY
… begins with an account on the development of shearography as background. The conventional double-exposure shearography for static testing and the commonly adopted time-average shearography for vibration study have been credited for their particular contributions and evaluated for their …
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Development of a portable low-cost digital shearography system
Shearography is an optical non-destructive testing technique that is well-suited, but not limited, to testing composite materials. The method takes advantage of the special properties of lasers, namely their high coherence length and monochromatic light, to detect flaws such as cracks, debonds and …
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Vibration excitation of aerospace composite materials for defect determination using optical NDT techniques (ESPI/Shearography)
… aerospace composite materials using ESPI and/or Shearography. ESPI and shearography are both laser based digital interferometric techniques used to non-destructively identify defects in small and large structures. Vibration excitation is proposed to be used as the excitation method for the above …
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Effect of Vibration of Unconsolidated Sand on the Performance of Interferometric Vibration Sensors
… of laser Doppler vibrometry and digital shearography is described. The effect of vibration of the unconsolidated sand on the performance of both sensors is experimentally investigated.</p> <p>The vibration of unconsolidated sand can cause an increase of noise in the laser Doppler …
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Comparative study of non-destructive testing methods of defect detection on aircraft
… strength materials. In this thesis, Digital shearography and Infrared Thermography (IRT) techniques are employed to test aircraft composite materials. Background information on the techniques has been presented and the literature survey has confirmed the use of these techniques on aircraft …
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Effective and Efficient Non-Destructive Testing of Large and Complex Shaped Aircraft Structures
… A method of integrating all the modules of the shearography system that provides significant improvement in the minimum defect detection capability for which a patent has been granted. 8. The matching of the applied stress to the data capture and processing during a shearographic inspection …
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Space-variant optical phase retarders in liquid crystal polymers and their applications
… The mathematical model and its application to shearography are exposed. In chapter five, another kind of retarders is introduced. These retarders are characterized by a rotation of their fast axis along the center of the retarder. Their properties, the recording systems and the first prototypes …