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A laser Doppler vibrometer (LDV) is a scientific instrument that is used to make non-contact vibration measurements of a surface. The laser beam from the LDV is directed at the surface of interest, and the vibration amplitude and frequency are extracted from the Doppler shift of the reflected laser beam frequency due to the motion of the surface.
The scanning laser vibrometer or scanning laser Doppler vibrometer, was first developed by the British loudspeaker company, Celestion, around 1979, [1] further developed in the 1980s, [2] and commercially introduced by Ometron, Ltd around 1986. It is an instrument for rapid non-contact measurement and imaging of vibration.
Shop the best deals at Walmart this weekend in their secret sale section — $1,700 off a Samsung TV (yes, really!) and more. Heather Quinlan and Rory Halperin. Updated January 19, 2024 at 12:37 PM.
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 ...
For a limited time only, score this must-have kitchen gadget on sale for $127 at Walmart, while it's $170 at Amazon. $127 at Walmart. Walmart. Yankee Candle Spiced Pumpkin Candle.
Trending Walmart Black Friday Deals. HP 15.6 inch Windows Laptop, $199 (was $379) Apple AirPods 2nd Gen, $89 (was $129). Shark Navigator Lift-Away XL Upright Vacuum, $97 (was $199). KitchenAid ...