Patent ID: 6924890
Filing Date: 2005-08-02
Classification: G01M

Abstract:
1. A method for measuring at least one parameter of an individual fiber of a fiber cable, the method comprising: reflecting measuring radiation at the end of a test fiber to a fiber input using a mirror having at least 99% reflectivity; measuring the at least one parameter using a combined transmitting and receiving station disposed at the fiber input; driving and modulating a laser using a pulse generator, the laser being disposed at a field measuring station; conducting a signal corresponding to approximately 10% of a light beam to a first input of an oscillograph using a Y-coupler; inputting a signal corresponding to approximately 90% of the light beam to a first port of a circulator, a second port of the circulator being connected to the test fiber, the end of the test fiber being connected to the mirror; inputting the reflected measuring radiation to a detector via a third port of the circulator; inputting an output signal of the detector to a second input of the oscillograph; delaying a trigger pulse of the oscillograph using a variable electric delay line so that a measuring pulse appears stable on a monitor of the oscillograph; measuring a position of a peak of the measuring pulse; and using the measured position as a measured value.