Manufacturing Industry
Metallic sensor changes electrical output under stress. (Testing/Analysis).
Advanced Materials & Processes, September, 2002
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A relatively inexpensive and lightweight strain sensor wire that produces a measurable change in electrical output has been developed by Sensortex Inc., Kennett Square, Pa., with the help of SBIR funding from the Missile Defense Agency, Alexandria, Va. Called Magstrain, the sensor is made by coating a small diameter (75 to 125 microns) copper wire with a ten-micron thick nickel-iron film.
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An alternating current is driven through the wire at low levels of 50 to 500 milliamperes, creating a magnetic field with voltage output at a base frequency. Even the smallest of changes in ...
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