Strain sensor for attachment to a structural member
First Claim
1. A strain sensor device for attachment to a structural member for measuring compressive and tensile strains experienced by the member along a strain axis of the structural member, the strain sensor device comprising:
- a strain member adhesively secured to the structural member generally parallel to but not in series with the structural member strain axis so that the strain sensor experiences only a portion of the load experienced by the structural member, the strain member being secured to the structural member under a predetermined tension to facilitate generally continuous sensing of both compressive and tensile strains experienced by the structural member; and
four strain gages secured to the strain, member, two of the strain gages being longitudinally oriented with respect to the strain member to experience longitudinal strain and two of the strain gages being transversely oriented with respect to the strain member to experience Poisson strain, the four strain gages forming a strain gage bridge circuit for generating electrical signals proportional to strains sensed in the structural member.
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Accused Products
Abstract
A strain sensor device is disclosed for attachment to a structural member for measuring strains experienced by the member along a strain axis. The strain sensor device comprises a tensile strain member secured to the structural member generally parallel to the strain axis. Two strain gages are secured to the tensile strain member, one of the strain gages being longitudinally oriented with respect to the strain member to experience longitudinal strain and the other of the strain gages being transversely oriented with respect to the strain member to experience Poisson strain. The two strain gages comprise a strain gage bridge circuit for generating electrical signals proportional to strains sensed in the structural member.
51 Citations
6 Claims
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1. A strain sensor device for attachment to a structural member for measuring compressive and tensile strains experienced by the member along a strain axis of the structural member, the strain sensor device comprising:
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a strain member adhesively secured to the structural member generally parallel to but not in series with the structural member strain axis so that the strain sensor experiences only a portion of the load experienced by the structural member, the strain member being secured to the structural member under a predetermined tension to facilitate generally continuous sensing of both compressive and tensile strains experienced by the structural member; and four strain gages secured to the strain, member, two of the strain gages being longitudinally oriented with respect to the strain member to experience longitudinal strain and two of the strain gages being transversely oriented with respect to the strain member to experience Poisson strain, the four strain gages forming a strain gage bridge circuit for generating electrical signals proportional to strains sensed in the structural member. - View Dependent Claims (2, 3, 4, 5)
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6. A strain sensor device for attachment to a structural member for measuring compressive and tensile strains experienced by the member along a strain axis of the structural member, the strain sensor comprising:
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a strain member adhesively secured to the structural member generally parallel to but not extending through the structural member strain axis, the strain member being secured to the structural member under a predetermined tension to facilitate generally continuous sensing of both compressive and tensile strains experienced by the structural member; and at least two strain gages secured to the strain member, one of the strain gages being longitudinally oriented with respect to the strain member to experience longitudinal strain and the other of the strain gages being transversely oriented with respect to the strain member to experience Poisson strain, the two strain gages comprising a strain gage bridge circuit for generating electrical signals proportional to strains sensed in the structural member.
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Specification