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Theodore Maiman operated the first functioning LASER on May 16, 1960 at Hughes Research Laboratories, Malibu, California, [6] A device that operates according to the central idea of the "sound amplification by stimulated emission of radiation" theory is the thermoacoustic laser. This is a half-open pipe with a heat differential across a special ...
On 25 August 2009, U.S. patent 7,580,533 was issued for a device that uses a laser beam and smoke or vapor to detect sound vibrations in free air ("Particulate Flow Detection Microphone based on a laser-photocell pair with a moving stream of smoke or vapor in the laser beam's path"). Sound pressure waves cause disturbances in the smoke that in ...
The lyrebird is an Australian species best known for its ability to mimic man-made sounds. National Geographic has recorded these remarkable birds mimicking such unnatural noises as a chainsaw and ...
Playing the actual sound is usually handled by connecting the laser harp to a synthesizer, sampler or computer. This frameless design is more elaborate than the framed style, relying on reflecting the light back to a single photodiode. The fan of laser beams is actually a single beam scanned into a fan pattern.
Laser-ultrasonics uses lasers to generate and detect ultrasonic waves. [1] It is a non-contact technique used to measure materials thickness, detect flaws and carry out materials characterization. The basic components of a laser-ultrasonic system are a generation laser, a detection laser and a detector.
In order to obtain this effect the light intensity must vary, either periodically (modulated light) or as a single flash (pulsed light). [1] [page needed] [2] The photoacoustic effect is quantified by measuring the formed sound (pressure changes) with appropriate detectors, such as microphones or piezoelectric sensors. The time variation of the ...
Pink noise can be processed, filtered, and/or effects can be added to produce desired sounds. Pink-noise generators are commercially available. One parameter of noise, the peak versus average energy contents, or crest factor , is important for testing purposes, such as for audio power amplifier and loudspeaker capabilities because the signal ...
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