Strain sensor using saw technology
AssigneeMnemonics, Inc.
InventorFred Johnson
Life of this patent
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Abstract
A strain sensor for determining a strain experienced by a body under test in response to forces exerted on the body-under-test. The strain sensor comprises an interface member mounted on a surface of the body-under-test and a SAW sensor mounted on a surface of the interface member. The strain in the body-under-test is translated to strain in the SAW sensor and determined by the SAW sensor. The strain in the SAW sensor is responsive to the strain in the body-under-test.
Claims19
A strain sensor for determining a strain experienced by a body under test, in response to forces exerted on the body-under-test, the strain sensor comprising:
- an interface member mounted on a surface of the body-under-test;
- a SAW sensor comprising a substrate mounted on a surface of the interface member, wherein the strain in the body-under-test is translated to strain in the substrate via the interface member, and the strain in the body-under-test is determined from the strain of the substrate;
- and
- wherein the strain imposed on the substrate is below an elastic limit of the substrate and the strain imposed on the interface member is below an elastic limit of the interface member, and wherein a first surface of the interface member in contact with a first surface of the body-under-test experiences the same strain as the first surface of the body-under-test, and wherein a first surface of the substrate in contact with a second surface of the interface member experiences the same strain as the second surface of the interface member.
A strain sensor for determining a strain imposed on a body-under-test in response to forces exerted on the body-under-test, the strain sensor comprising:
- a first interface member, a SAW sensor comprising a substrate, and a second interface member forming a serial string with the SAW sensor between the first and second interface members;
- the serial string connected between first and second locations on a body-under-test;
- wherein strain in the body-under-test is translated to strain in the substrate through the first and second interface devices and determined by the SAW sensor, wherein from determined strain in the SAW sensor the strain in the body-under-test can be determined;
- and
- wherein the strain imposed on the substrate is less than an elastic limit of the substrate.
A strain sensor for determining a strain experienced by a body under test in response to forces imposed on the body-under-test, the strain sensor comprising:
- a first end of the body-under-test attached to a fixed surface and a second end of the body-under-test attached to a moveable surface;
- an interface member and a SAW sensor serially configured and attached between the fixed surface and the moveable surface;
- and
- wherein from a strain measured by the SAW sensor, a strain experienced by the body-under-test can be determined.
Dependencies are inferred from the claim text.