Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1977-09-26
1979-12-04
Clark, Conrad J.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
328 20, 328 38, G01B 902, H03B 1900, H03K 500
Patent
active
041769619
ABSTRACT:
The diameter of an optical fiber is continuously measured by directing a laser beam at the fiber to form a light intensity fringe pattern. The pattern is converted to a substantially sinusoidal electrical signal having a period proportional to the fiber diameter. The sinusoidal signal is forwarded to a tapped delay line to form a plurality of delayed replicas thereof having a predetermined delay therebetween. A pulse is generated for each zero crossing of all the sinusoidal signals and the pulses interleaved to form an output train having an interpulse interval proportional to a fraction of the fiber diameter.
REFERENCES:
patent: 3524075 (1970-08-01), Matthews et al.
patent: 3965430 (1976-06-01), Brandt
patent: 3982816 (1976-09-01), Watkins
Merson; Lawrence N., "Digital Multiplier", RCA Technical Notes, No. 736, Jan. 1968.
MacLeod; K., "A Portable High-Resolution Counter for Low-Frequency Measurements", Hewlett-Packard Journal, vol. 25, No. 3, pp. 10-15, 11/1973.
Breslau, "Frequency Doubler", IBM Technical Disclosure Bulletin, vol. 10, No. 6, 11/1967._
Frazee, Jr. Ralph E.
Smithgall, Sr. David H.
Clark Conrad J.
Kirk D. J.
Western Electric Co. Inc.
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