Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-12-19
1993-03-09
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022713, 359280, 359296, H01J 516
Patent
active
051928620
ABSTRACT:
A polarizerless optic sensor is provided that uses a random domain magneto-optic film and a modulated normal magnetic field to vary or modulate the energy distribution in a diffraction pattern. Light is transmitted through the film and is diffracted according to a domain duty cycle so that the center beam intensity is a function of the Faraday rotation angle of the material and the intensity of the applied normal magnetic field. The polarizerless sensor can be used to realize a speed and torque sensor, an optical switch, a magnetic field sensor and many other types of devices. The invention can be used with polarized and unpolarized input light. The sensor can be implemented using a random domain film or a stripe domain film to create a phase grating diffraction pattern.
REFERENCES:
patent: 3548649 (1970-12-01), Parkinson
patent: 3752563 (1973-08-01), Torok et al.
patent: 4168107 (1979-09-01), Sauter
patent: 4195261 (1980-03-01), Zwingman
patent: 4228473 (1980-10-01), Himuro et al.
patent: 4355864 (1982-10-01), Soref
patent: 4398798 (1983-08-01), Krawczak et al.
patent: 4529875 (1985-07-01), Brogardh et al.
patent: 4604577 (1986-08-01), Matsumura et al.
patent: 4678268 (1987-07-01), Russo et al.
patent: 4796966 (1989-01-01), Kovaleski et al.
patent: 4843232 (1989-06-01), Emo et al.
patent: 4844580 (1989-07-01), Lynch et al.
patent: 4896103 (1990-01-01), Shimanuki et al.
patent: 4942294 (1990-07-01), Witte
patent: 4947035 (1990-08-01), Zook et al.
patent: 4952014 (1990-08-01), Lieberman et al.
patent: 5038102 (1991-08-01), Glasheen
Sauter, G. F., et al. "Alterable Grating Fiber-Optic Switch", Applied Optics, vol. 20, No. 20, 15 Oct. 1981, 3566-3571.
Sauter, G. F., et al. "Multifunction Integrated Optic Device Using Magnetically Alterable Phase Grating," Applied Physics Letters, vol. 30, No. 1, 1 Jan. 1977, pp. 11-13.
Haskal, Haim M. "Polarization and Efficiency in Magnetic Holography," IEEE Transactions on Magnetics, vol. 6, No. 3, Sep. 1976, pp. 542-545.
Numata, Takuhisa, et al. "Magneto-Optical Hysteresis Loops of Multidomain Materials-Calculation for Fixed Analyzer Method," Journal of the Magnetics Society of Japan, vol. 14, No. 4 (1990), pp. 642-647.
Tanaike, H., et al. "Magneto-Optical Hysteresis Loops of Multidomain Materials-Experimental for Fixed Analyzer Method," Journal of the Magnetics Society of Japan, vol. 14, No. 4 (1990), pp. 648-652.
Hansen, P., et al. "Optical Switching with Bismuth-Substituted Iron Garnets," Philips Technical Review, vol. 41, 1983/84, No. 2, pp. 33-45.
Scott, G. B., and Lacklison, D. E. "Magnetooptic Properties and Applications of Bismuth Substituted Iron Garnets," IEEE Transactions and Magnetics, vol. 12, No. 4, Jul. 1976, pp. 292-310.
Schreurs, J. W. H., and Borrelli, N. F. "A Method to Determine the Thickness and Magnetization of Thin Uniaxial Magnetic Films," Journal of Applied Physics, vol. 43, No. 9, Sep. 1972, 3882-3884.
Johansen, T. R., et al. "Variation of Stripe-Domain Spacing in a Faraday Effect Light Deflector," Journal of Applied Physics, vol. 42, No. 4, 15 Mar. 1971, 1715-1716.
Kooy, C., and Enz, U. "Experimental and Theoretical Study of the Domain Configuration in Thin Layers of BaFe.sub.12 O.sub.19," Philips res. Repts 15 (1960), pp. 7-29.
Davenport T.
Lewis Leonard L.
Nelms David C.
Ronyak David M.
Simmonds Precision Products Inc.
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