Strain gauge with steel substrate
DCFirst Claim
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1. A strain gauge comprising:
- a steel substrate having marginal portions that are adapted to be welded or bolted to a structural member subject to strain;
a dielectric layer on the substrate;
a strain sensing circuit on the dielectric layer including piezoresistors directly on the dielectric layer; and
a signal processing circuit on the substrate adjacent the strain sensing circuit and coupled to the strain sensing circuit to produce an output signal indicative of said strain.
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Abstract
A strain gauge has a stainless steel substrate with a dielectric coating comprising two dielectric layers. A circuit comprising conductors, resistors and piezoresistors in a Wheatstone bridge configuration is formed on the dielectric. One dielectric layer is to adhere to the steel and a second is to form a barrier against diffusion of the first layer into the piezoresistor material. An amplification and signal conditioning circuit is applied adjacent the bridge. The steel substrate is to be welded or bolted at its marginal portions to a structure subject to strain.
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7 Claims
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1. A strain gauge comprising:
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a steel substrate having marginal portions that are adapted to be welded or bolted to a structural member subject to strain; a dielectric layer on the substrate; a strain sensing circuit on the dielectric layer including piezoresistors directly on the dielectric layer; and a signal processing circuit on the substrate adjacent the strain sensing circuit and coupled to the strain sensing circuit to produce an output signal indicative of said strain. - View Dependent Claims (2, 3, 4)
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5. In combination:
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a structure subject to a strain; and a strain gauge for sensing the strain, including a steel plate having a bottom surface in contact with the structure and marginal portions that are welded or bolted to the structure, a dielectric layer formed on a top surface of said steel plate opposite to said bottom surface, strain sensing piezoresistor elements formed on said dielectric layer in a central region within said marginal portions, and a signal processing circuit mounted on the dielectric layer adjacent the strain sensing elements and coupled to the strain sensing elements for producing an output signal indicative of the sensed strain. - View Dependent Claims (6, 7)
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Specification