Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1997-04-10
2000-08-15
Dombroske, George
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01B 902
Patent
active
061018848
ABSTRACT:
A method for measuring strain on a structure having a bore and an untethered fiber-optic strain gauge embedded in the bore, which includes the steps of inserting a coupler portion of a fiber-optic cable into the bore in operative relationship to the fiber-optic strain gauge, and using an optical cavity length measurement device attached to the distal end of the fiber-optic cable to measure the strain on the structure. The coupler portion of the fiber-optic cable is removed from the bore after the strain on the structure has been measured. In an illustrative embodiment, the structure is a fastener, e.g., a rivet, used to join together the aluminum skin and the airframe of an aircraft, the bore being provided coincident with the central, longitudinal axis of the rivet.
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Dombroske George
Hoch Ramon R.
McDonnell Douglas Corporation
Westerlund Robert A.
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