Polarizerless magneto-optic speed and torque sensor

Details Polarizerless magneto-optic speed and torque sensor Polarizerless magneto-optic speed and torque sensor

G - Physics

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G01L 3/08 (2006.01) G01D 5/34 (2006.01) G01L 3/10 (2006.01) G01L 3/12 (2006.01) G01P 3/36 (2006.01) G01P 3/486 (2006.01) G01P 3/488 (2006.01) G01R 33/032 (2006.01) G02F 1/29 (2006.01)

Patent

CA 2125766

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 unpolar- ized input light. The sensor can be implemented using a random domain film or a stripe domain film to create a phase grating diffraction pattern.

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