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US 4,282,749 AGranted
Strain measuring system
OwnerJohn D. Russellinventor
Life of this patent
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Abstract
This invention relates to strain measuring systems. In a preferred embodiment of the invention the system comprises four (4) strain responsive tubes arranged in bridge fashion and carrying a fluid stream under pressure. As strain deforms the tubes the fluid flow is changed proportionate to the strain.
Claims6
A system for measuring strain in a body subjected to stress comprising:
- a plurality of strain-deformable members adapted for attachment to said body and arranged in a fluid bridge configuration having a pair of fluid input junctions and a pair of fluid output junctions;
- a source of fluid pressure connected across said fluid input junctions for supplying a fluid stream at a constant rate and pressure through said members in said fluid bridge;
- and
- a pressure sensitive transducer connected across said fluid output junctions, whereby a change in fluid flow rate and pressure in said members effected by deformations produced by strains in the body will be detected by said transducer.
1 more element
Dependencies are inferred from the claim text.