Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1981-11-20
1986-06-24
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
356346, 356358, G01B 902
Patent
active
045964661
ABSTRACT:
A method and apparatus are provided for the remote measurement of a quantity of length or displacement, employing fiber-optical signal transmission between two or more interferometers, one of which acts as an optical transducer while the other acts as the receiver for the information about the quantity to be measured. A major advantage of the arrangement is that it operates with low-power, spatially incoherent broad-bandwidth light. More particularly, the quantity to be measured is represented by the path difference of two partial light beams passing through the arms of one interferometer, thus encoding the information about the path difference onto the light-flux resulting from the recombination of the two partial light beams. The transmitting interferometer is connected by an optical fiber with a receiving interferometer, where the information is recovered by evaluating the autocorrelation signal of the transmitted light. This use of optical fiber for connecting the two interferometers is another important feature which permits long distances to exist between the interferometers so that the measurement can be made of a quantity which is quite far away from the desired point of evaluation.
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Koren Matthew W.
Willis Davis L.
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