1981
DOI: 10.1002/j.1538-7305.1981.tb00311.x
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High-Speed Measurement and Control of Fiber-Coating Concentricity

Abstract: A technique has been implemented to measure and control the eccentricity of lightguide fiber in transparent polymer coating materials. It is based upon a model which describes the characteristics of a forward‐scattered light pattern generated by transversely illuminating coated fiber with a laser beam. The model predicts the behavior of the principal characteristics of the pattern as a function of fiber eccentricity within the coating. The implementation automatically detects and controls the position of the d… Show more

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Cited by 20 publications
(3 citation statements)
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“…In this experiment the standard deviation of fiber diameter variation was less than 0.5 pm for a 125-pm fiber. A desired and uniform thickness was provided by a high-speed coating applicator, while a good coating concentricity was maintained throughout the en- tire length with the automatic centering system [63]. The thickness of coating is 50 pm, and typical cross sections of the fiber coated at the two different speeds are shown in Fig.…”
Section: Performance Of High-speed Coated Fibers a Strength Resultsmentioning
confidence: 99%
“…In this experiment the standard deviation of fiber diameter variation was less than 0.5 pm for a 125-pm fiber. A desired and uniform thickness was provided by a high-speed coating applicator, while a good coating concentricity was maintained throughout the en- tire length with the automatic centering system [63]. The thickness of coating is 50 pm, and typical cross sections of the fiber coated at the two different speeds are shown in Fig.…”
Section: Performance Of High-speed Coated Fibers a Strength Resultsmentioning
confidence: 99%
“…35. 36 The differences are that the coating can have either a smaller or larger refractive index than the core glass. The measurement is also different since it is concentricity rather than diameter which is of primary interest.…”
mentioning
confidence: 99%
“…5 illustrates a geometric ray trace model for light refracted through the tube cross section. Assuming a circular, concentric structure with inner and outer radii a and b, and glass refractive index n, = 1.457 1 at a wavelength of 0.6328 p , the equations governing the refracted ray path through the tube cross section, for an incident ray initially a distance x from the optical axis, can be derived in an identical manner to those used for measuring the concentricity of high index coating on silica glass fibers [4]. Of particular interest is the angle 8 to which the light ray is refracted through the tube.…”
mentioning
confidence: 99%