Laser Generation of “Directed” Ultrasound in Solids Using Spatial and Temporal Beam Modulation
Laser based methods for generation and detection of ultrasound are well established laboratory tools. Since only beams of light interact with the surface of an object, laser ultrasonic methods are potentially non-contacting and remote and may be used in applications involving hazardous environments or unusual component geometries. However, for use in the field as a nondestructive testing tool, or in the factory as a sensor for process control, laser ultrasonic methods suffer by comparison with more conventional contact transducer techniques with regard to their generation efficiency and sensitivity. In an effort to improve the overall sensitivity of laser ultrasonic systems, schemes for temporally and spatially modulating the laser generation source have been investigated.
KeywordsAcoustic Signal Line Source Laser Pulse Duration Phase Antenna Array Repetitive Pulse
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