Optical vibration detection with a photoconductance monitoring array

Heinz, P.; Garmire, E.
April 2004
Applied Physics Letters;4/19/2004, Vol. 84 Issue 16, p3196
Academic Journal
An approach for the detection of intensity variations at frequencies in the megahertz range is proposed. An array of semi-insulating GaAs photoconductance sensors is used to detect the intensity variations that result from lateral motion of a speckle or interference pattern. The outputs of the individual array elements are summed to obtain a large signal. A prominent application that may benefit from this approach is the detection of speckle motion induced by ultrasonic surface displacements of optically rough surfaces in nondestructive testing. © 2004 American Institute of Physics.


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