Strain gage transducer
First Claim
1. A strain gage force measuring transducer comprising a beam-like structure having a shear strain surface, means for supporting said structure and for applying a force to be measured thereto at any one of various load points randomly located longitudinally thereof;
- variable resistance strain gage means affixed to said surface for measuring changes in actual shear strain experienced thereby, said strain gage means being located and oriented on said surface to have the electrical resistance thereof changed by changes in apparent shear strain and by changes in bending strain, with the net resistance changes of said gage means being substantially responsive in substantially directly proportion to changes in actual shear strain; and
an electrical circuit coupled to said gage means and being responsive to said net resistance changes to indicate substantially the value of said force to be measured when said force is applied at any one of said various load points.
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Accused Products
Abstract
A strain gage force measuring transducer is described in which distortion of measurements of a given strain on a given surface due to the interaction between the given strain and a second strain is eliminated by making a combined measurement of both strains on that same surface, equating the measured value of the second strain with the value of the distortion, and entering the so measured and equated value of the second strain into the combined measurement with a sign opposite to the sign of the distortion so as to cancel same. In a typical use, a shear beam shear-type transducer having a high degree of point-of-load insensitivity is provided thereby.
26 Citations
14 Claims
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1. A strain gage force measuring transducer comprising a beam-like structure having a shear strain surface, means for supporting said structure and for applying a force to be measured thereto at any one of various load points randomly located longitudinally thereof;
- variable resistance strain gage means affixed to said surface for measuring changes in actual shear strain experienced thereby, said strain gage means being located and oriented on said surface to have the electrical resistance thereof changed by changes in apparent shear strain and by changes in bending strain, with the net resistance changes of said gage means being substantially responsive in substantially directly proportion to changes in actual shear strain; and
an electrical circuit coupled to said gage means and being responsive to said net resistance changes to indicate substantially the value of said force to be measured when said force is applied at any one of said various load points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- variable resistance strain gage means affixed to said surface for measuring changes in actual shear strain experienced thereby, said strain gage means being located and oriented on said surface to have the electrical resistance thereof changed by changes in apparent shear strain and by changes in bending strain, with the net resistance changes of said gage means being substantially responsive in substantially directly proportion to changes in actual shear strain; and
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13. The transducer of claim 18 further characterized by said strain gage means comprising a plurality of portions each occupying a different arm of said bridge.
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14. A strain gage force transducer comprising a plurality of beam-like structures each having a shear strain surface, means for supporting said structures and for applying a portion of a force to be measured to each of said structures at any one of various load points randomly located longitudinally of said structures, variable resistance strain gage means affixed to each said surface for measuring changes in actual shear strain experienced thereby, each said strain gage means being located and oriented on its said surface to have the electrical resistance thereof changed by changes in apparent shear strain and by changes in bending strain, with the net resistance changes of said gage means being substantially responsive in substantially directly proportion to changes in actual shear strain;
- and an electrical circuit coupled to all of said gage means and being responsive to the sum of said net resistance changes to indicate substantially the value of said force to be measured when said force is applied at any one of said various load points.
Specification