Equipment for measuring the length of dielectric elements transm

Details Equipment for measuring the length of dielectric elements transm Equipment for measuring the length of dielectric elements transm

1978-02-02

1979-12-04

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

356383, G01N 2100, G01B 1102

Patent

active

041769546

ABSTRACT:
An equipment for measuring length or refractive index of a dielectric element capable of transmitting optical frequency signals, for instance an optical wave guide. The used method consists in making at least one measurement of the propagation time of a light impulse over a length of the said element, and deducing therefrom the unknown length or index, if one of the latter is previously known. The equipment includes an injector of light signals, a separator dividing each light pulse signal into a delayed and a non-delayed one respectively transmitted through a first and a second path one of which contains the dielectric element to be measured and the other of which is used as a comparison one, a detector at the output of each of said paths, and a viewing element displaying the outputs of both detectors on a common screen, for instance that of an oscilloscope whereby the propagation time difference between said paths is translated into the spacing between the said outputs observed on said screen.

REFERENCES:
patent: 3545862 (1970-12-01), Ackerman
patent: 3728026 (1973-04-01), Idestrom et al.
"Optical Ranging System Using Laser Transmitter", Stitch et al.; Electronics; Apr. 21, 1961; pp. 51-53.

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