Active temperature differential compensation for strain gage based sensors
First Claim
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1. A differential temperature compensation method for strain gage based sensors comprising:
- providing an array of temperature sensing devices at locations along a strain gage, wherein said strain gage comprises a plurality of tension gages and compression gages;
measuring the temperature differential between said temperature sensing devices provided at said locations; and
utilizing said temperature differential measured between said temperature sensing devices to dynamically correct thermally induced strain in said strain gage, wherein said thermally induced strain in said strain gage is equivalent to a difference in strain in said tension gages and said compression gages.
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Abstract
An active temperature differential compensation for strain gage based sensors. An array of temperature sensors can be placed at the gage locations to measure the difference in temperature that induces strain on the strain gages. The output of the temperature sensor network can be placed in series with the strain gage network to directly compensate the induced voltage caused by the temperature gradient and/or employed as the input of a mathematical algorithm that can compensate the output from the strain gage bridge to dynamically correct unwanted thermally induced strain in the strain gages.
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Citations
17 Claims
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1. A differential temperature compensation method for strain gage based sensors comprising:
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providing an array of temperature sensing devices at locations along a strain gage, wherein said strain gage comprises a plurality of tension gages and compression gages; measuring the temperature differential between said temperature sensing devices provided at said locations; and utilizing said temperature differential measured between said temperature sensing devices to dynamically correct thermally induced strain in said strain gage, wherein said thermally induced strain in said strain gage is equivalent to a difference in strain in said tension gages and said compression gages. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A strain gage sensor system adapted with differential temperature compensation, comprising:
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at least one strain gage device deployed at a strain gage measurement location, wherein said strain gage comprises a plurality of tension gages and compression gages; an array of temperature sensing devices wherein individual temperature sensing devices comprising said array of temperature sensing devices are each disposed at various locations along said at least one strain gage; wherein measurements of temperature differential between said individual temperature sensing devices are utilized to dynamically correct thermally induced strain in said at least one strain gage, wherein said induced strain in said at least one strain gage is equivalent to a difference in strain in said tension gages and said compression gages. - View Dependent Claims (11, 12, 13)
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14. A strain gage sensing system, comprising:
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strain sensing elements electrically connected in the formation of a Wheatstone bridge circuit wherein said strain sensing elements comprise a plurality of tension gages and compression gages; temperature sensing elements electrically connected in the formation of a Wheatstone bridge circuit and individually associated with each of said strain sensing elements in the Wheatstone bridge circuit; and wherein output measured from said temperature sensing elements is used to compensate for temperature effects on output from said strain sensing elements wherein said output from said strain sensing elements is equivalent to the difference in strain in said tension gages and said compression gages. - View Dependent Claims (15, 16, 17)
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Specification