Optics: measuring and testing – Material strain analysis
Patent
1981-12-28
1983-12-13
Punter, William H.
Optics: measuring and testing
Material strain analysis
73800, G01B 1116, G01L 124
Patent
active
044202512
ABSTRACT:
This invention relates to a lightweight and compact optical sensor that provides an indication of a deformation (e.g. fatigue, vibration, flex, torsion, bending, slippage) occurring at a monitored area. The sensor includes at least one light transmitting optical fiber and an optical detector that is responsive to the optical characteristics (e.g. amplitude, phase, polarization angle) of a supply of light signals being transmitted through the fiber. In the event that deformation occurs at the monitored region, the optical fiber undergoes a displacement which thereby causes a corresponding change in the optical characteristics of the light signals supplied to the detector. The optical characteristics of the light signals supplied to the detector relative to those of the light signals supplied to the optical fiber provide an accurate indication of the physical parameter.
REFERENCES:
Kelley et al., "Light Measurement Many Ways" Photonics Spectra, 3-1983, p. 52.
Brown, E. B. "Modern Optics", Reinhold Pub. Corp. 1965 pp. 219-225.
Sheem et al., "Acoustic Sensitivity of Single-Mode Optical Power Dividers" Optics Letters, 10-1979, pp. 322-324.
Sheem et al., "Polarization Effects on Single-Mode Optical Fiber Sensors", App. Phys. Lett. 12-1979, pp. 914-917.
Ogawa et al., "Multimode Fiber Coupler" App. Optics 7-1978 pp. 2077-2079.
Layton et al., "Optical Fiber Acoustic Sensor Utilizing Mode-Mode Interference" App. Optics 3-1979, pp. 666-670.
Kingsley, S. A., "Measurement of the Pressure Sensitivity of Single-Mode Optical-Fibre Phase Modulators", Microwaves, Optics & Acoustics, 11-1978, 204-208.
August Rudolf R.
James Kenneth A.
Quick William H.
Strahan Virgil H.
Fischer Morland C.
Hamann H. Fredrick
Punter William H.
Rockwell International Corporation
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