Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1986-06-23
1988-06-28
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
250227, 356358, G01B 902
Patent
active
047535296
ABSTRACT:
Intensity modulated incoherent light is input to an interferometer. The interferometer is preferably formed to have a first arm comprising a first optical fiber and a second arm comprising a second optical fiber. The fibers have an initial optical pathlength difference .DELTA.L.sub.o. The refractive index of a selected one of the optical fibers is determined, and the output of the interferometer is monitored to detect a null signal output with an initial predetermined frequency resolution bandwidth. The initial length resolution is calculated, and the length of one of the fibers is reduced. The frequency resolution bandwidth is then reduced to a new predetermined value, and the frequency providing a null signal output at the new frequency resolution bandwidth is measured. The process is repeated until the pathlength difference becomes a predetermined value.
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Koren Matthew W.
Litton Systems Inc.
Lynn John H.
Willis Davis L.
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