Optical detector for magnetic fields employing feedback circuitr

Details Optical detector for magnetic fields employing feedback circuitr Optical detector for magnetic fields employing feedback circuitr

1977-01-18

1978-03-14

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Read only detector using light for reading magnetically...

350151, 365121, G11B 532

Patent

active

040794296

ABSTRACT:
An optical detector for magnetic fields detects rotations in the polarization of a beam of polarized light caused by the magnetic fields. A modulator responsive to a fixed frequency signal introduces a fixed frequency of oscillation in the polarization of the light beam. The output signal of a polarization detector is filtered by a band pass filter and is fed, along with the fixed frequency signal, to a phase detector. The output of the phase detector is inverted and used as a feed-back signal to the modulator to cancel the rotation in polarization caused by the magnetic field. This feedback signal is also the final output signal of the detector.

REFERENCES:
patent: 2974561 (1961-03-01), Hardy et al.
patent: 3268879 (1966-08-01), Lins
patent: 3284785 (1966-11-01), Kornei
patent: 3491351 (1970-01-01), Smaller et al.
patent: 3721965 (1973-03-01), Morgan-Voyce
patent: 3775570 (1973-11-01), Lewicki et al.
patent: 3947890 (1976-03-01), Travot et al.

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