NON-CONTACT STRESS MEASURING DEVICE
First Claim
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1. Apparatus for measuring stress in conductive material without physically contacting the material, the apparatus comprising:
- an inductor circuit configured to induce an alternating current along a first path in the material; and
a detector connected to the inductor circuit and configured to detect a signal representative of the stress in the material along the first path when current is induced in the material.
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Abstract
Apparatuses and methods for measuring stress or strain in a conductive material without physical contact with the material are provided. The device comprises an inductor circuit configured to induce an alternating current into the material along a first path; and a detector configured to detect a signal representative of the stress in the material along the first path when current is induced in the material.
31 Citations
30 Claims
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1. Apparatus for measuring stress in conductive material without physically contacting the material, the apparatus comprising:
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an inductor circuit configured to induce an alternating current along a first path in the material; and a detector connected to the inductor circuit and configured to detect a signal representative of the stress in the material along the first path when current is induced in the material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A non-contact stress measuring device comprising:
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first means for inducing an alternating current in a material along a first path; second means for inducing an alternating current in the material along a second path; and means for detecting a signal representative of the differential stress in the material along the first path and the second path. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method for obtaining a measurement representative of a stress in a material, the method comprising:
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inducing an alternating current in the material along a first direction; and detecting a signal representative of the stress in the material along the first direction. - View Dependent Claims (20, 21, 22, 23)
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24. A stress measuring device for measuring stress in conductive material, the device comprising:
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an inductor circuit having first, second, third and fourth inductors arranged in a Wheatstone bridge and configured to induce current in the material along a first path, second path, third path and fourth path respectively; and a detector connected to the inductor circuit and configured to detect a signal representative of an imbalance in the Wheatstone bridge. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification