Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1987-05-15
1989-06-13
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2184, G01N 2188
Patent
active
048386898
ABSTRACT:
The invention relates to a method for the time-dependent, automatic measurement of the backscattered portions of light pulses coupled into an optical fiber under test, said portions being received by an optical detector and converted into electrical measurement signals, followed by amplification by a gain factor adapted to the measurement range, application to an electronic evaluation circuit and storage in a memory wherefrom they can be fetched for display on a display device. In the course of an automatic measurement operation at least two time-adjacent time domains (.DELTA.t1, .DELTA.t2) of measurement signals (6) are measured with different gain factors in order to be stored in memories (S1, S2) which are associated with the respective gain factors and which can be independently addressed.
REFERENCES:
Wearden, "The Optical Time Domain Reflectometer", Int Fiber Optics, vol. 2 #2, Mar. 1981, pp. 41-44.
Nakazawa et al., "Photon Probe Fault Locator for Single-Mode Optical Fiber Using an Acoustooptical Light Deflector", IEEE J of Quan. Electronics, vol. QE-17 #7, Jul. 1981, pp. 1264-1269.
Botjer William L.
McGraw Vincent P.
U.S. Philips Corp.
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