Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1991-12-31
1994-05-03
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356 731, 356357, 356384, G01B 902
Patent
active
053092210
ABSTRACT:
Methods for measuring the diameters of transparent filaments with high precision, e.g., RMS standard deviations of less than 0.02 microns, are provided. The methods involve determining the average spatial frequency .omega. of the far-field interference pattern produced by illuminating the filament with a beam of laser light. The average spatial frequency is determined by performing a fast Fourier transform (FFT) on the interference data to obtain a coarse estimate for the average and then performing a set of discrete sequence Fourier transforms (DSFTs) in the region of the coarse estimate to obtain the desired high precision estimate of the average. Efficient on-line processing procedures are provided so that real time measurements can be performed on, for example, a moving optical waveguide fiber, at rates of 500 measurements/second and above.
REFERENCES:
patent: 3982816 (1976-09-01), Watkins
patent: 4027977 (1977-06-01), Frazee, Jr.
patent: 4046536 (1977-09-01), Smithgall
patent: 4067651 (1978-01-01), Watkins
patent: 4136961 (1979-01-01), Young
patent: 4176961 (1979-12-01), Frazee et al.
patent: 4280827 (1981-07-01), Murphy et al.
patent: 4307296 (1981-12-01), Presby
patent: 4363827 (1982-12-01), Eichenbaum
patent: 4501492 (1985-02-01), Douklias
patent: 4541856 (1985-09-01), Maillard et al.
patent: 4847509 (1989-07-01), Millet et al.
patent: 4924087 (1990-05-01), Bailey et al.
patent: 5185636 (1993-02-01), Button et al.
"Measurement of Optical Fiber Diameter Using the Fast Fourier Transform", Mustafa A. G. Abushagur and Nicholas George, Applied Optics, Jun. 15, 1980, vol. 19, No. 12, pp. 2031-2033.
"Outer Diameter Measurement of Low Birefringence Optical Fibers by a New Resonant Backscatter Technique", A. Ashkin, J. M. Dziedzic and R. H. Stolen, Applied Optics, Jul. 1, 1981, vol. 20, No. 13, pp. 2299-2303.
Fischer Frederic P.
Lee Patrick S. K.
Logue Raymond C.
Parks Thomas W.
Corning Incorporated
Taylor, Jr. K. McNeill
Turner Samuel A.
LandOfFree
Measurement of fiber diameters with high precision does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Measurement of fiber diameters with high precision, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measurement of fiber diameters with high precision will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2118652