Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1990-01-12
1991-01-01
Wallace, Linda J.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01L 124
Patent
active
H00008648
ABSTRACT:
Improved passive and laser-conditioned magnetic field sensor of compact and integrated construction for enabling the detection of a magnetic field as well as an improved method of manufacture for assembling and selectively pretensioning a subassembly in order to provide an enhanced formation of the subassembly prior to use. The sensor is generally made up of a magnetic field sensing device, first and second fiber-optic elements, first and second couplers, a laser source and a combined detector and analysis means. The first and second couplers interconnect the first and second fiber-optic elements. The magnetic field sensing device is advantageously connected to one of the fiber-optic elements and is generally made up of a magneto-strictive material (MSM) of ribbon-like shape, a nonmagnetic substrate and a sensing element of optic fiber construction. This element is of predetermined and selective multistrand design between its ends and of generally serpentine shape. The sensing device is advantageously formed such that the MSM and the sensing element are uniformly and selectively pretensioned. As the result of this pretensioning, the MSM elongates when a magnetic field is detected thereby decreasing the elongation of the sensing element. Despite this decrease, the sensing element remains tensioned because of sufficient pretensioning and the phase shift in the laser as it is conducted through the optic fiber is detectable by the combined means.
Bucholtz Frank
Dandridge Anthony
Koo Kee P.
Tveten Alan B.
Goshorn Elmer E.
McDonnell Thomas E.
United States of America
Wallace Linda J.
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