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Erkan		 Laser measurement View All
How you can measure an elastic deflection on a metal bar within 0.5 second?
13 years ago - 1 month left to answer. - 3 responses - Report Abuse
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Niel
 Are you talking about 0.5 arc seconds of angle?

How long is the bar?

A deflection of 0.5 arc second in a one meter bar translates to 2.4 micrometers

With elastic deflection the bending of the bar will not be straight. It is a function of the square of the length of the bar.

There are systems on the market using optical fibers and lasers. These system look for changes in the length of the fiber as the result of bending of the bar.

Niel Leon
Community Developer - Engineering.com

13 years ago

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Erkan
ASKED BY 		I mean if I apply a load in the middle of a beam which will give an elastic deflection to the beam, how can i measure the elastic deflection caused by the impact instantly. Since it is elastic deflection the beam gets its original position after load applied. I need someting to measure that elastic deflection.

13 years ago

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Niel
 Erkian:

What you want is a laser displacement sensor system. It should allow to make these types of measurements. Below is a link to one company currently distributing these types of sensors.

13 years ago

Source: http://www.keyence.com/products/vision/laser/laser.php


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