Tutorial
Vibration Sensing with Laser Speckle
How to record individual musical instruments playing in an ensemble, using laser light.
Optical microphones—in which laser light and interferometry directly sense the vibration of the microphone membrane—are undergoing rapid commercial development. But there’s another way lasers can pick up sound: through changes in the speckle patterns of beams bounced directly off of sound-producing objects, such as musical instruments.
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