Device for interferometric measurements with compensation for ti

Details Device for interferometric measurements with compensation for ti Device for interferometric measurements with compensation for ti

1994-08-12

1996-04-30

Gonzalez, Frank

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356349, 356336, G01B 902

Patent

active

055130046

ABSTRACT:
An interferometric system for measuring cross-sectional dimensions of glass fibers and other elongate objects includes: a transmitting optics module for generating two laser beams, and causing the laser beams to intersect and interfere with one another over a measuring volume; several photodetectors to collect the light scattered by the glass fiber positioned in the interference region; and signal processing circuitry to deduce the fiber diameter using phase shifts between the signal pairs and fiber velocity using the frequency of the signals. The system further offers: elimination of the 360.degree. limitation on the product of sensitivity (degrees per micron) and range (microns), accompanied by an increase in accuracy using three or more detectors; uniform sensitivity over a large measuring volume, using fringe flare to compensate for changes in the effective angular separation of the detectors, due to fiber displacement within the measuring volume; and insensitivity to fiber tilt using large-area detectors for receiving the light scattered by the fiber.

REFERENCES:
patent: 3953128 (1976-04-01), Holly
patent: 4986659 (1991-01-01), Bachalo

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