Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1997-11-26
1999-11-30
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
With photodetection
356345, G01C 308, G01B 902
Patent
active
059952075
ABSTRACT:
The invention is a method for obtaining a measure of the light propagation time difference for two light-propagating-media paths. The first step consists of generating two substantially-identical frequency-modulated light waves whereby the frequency of the light waves is offset from a reference frequency by a different frequency increment for each basic time interval in each of a plurality of groups of three or more basic time intervals. Each frequency increment is the sum of a specified increment and a frequency-modulation-error increment. The frequency-modulation-error increments associated with the specified increments are independent of each other and unknown. The second step consists of feeding the two light waves into the entry points of two light-propagating-media paths having a light propagation time difference and obtaining a combination light wave by summing the light waves emerging from the exit points of the two light-propagating-media paths. The third step consists of calculating an estimated corrected or estimated uncorrected phase measure of the light propagation time difference for the two paths for a plurality of groups using only measured properties of the combination light wave.
REFERENCES:
patent: 4775216 (1988-10-01), Layton
patent: 5917597 (1999-06-01), Hall et al.
U.S. application No. 08/979,613, Gruse et al., filed Nov. 28, 1997.
U.S. application No. 08/980,459, Gruse et al., filed Nov. 28, 1997.
Bunn James B.
Bunn, Jr. James S.
Frederick Donald A.
Hall David B.
Hellner Mark
Litton Systems Inc.
Malm Robert E.
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