Electricity: measuring and testing – Magnetic – Displacement
Patent
1990-03-26
1994-01-18
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
32420717, 324253, G01B 714, G01R 3304
Patent
active
052802396
ABSTRACT:
Device for measuring intensity of magnetic field, displacement, speed and acceleration of magnetized and ferromagnetic objects in external magnetic field including source of external magnetic field, sensor sensing intensity of magnetic field and having toroid type ferromagnetic core, primary and secondary windings, circuitry for activating primary winding with alternative current, circuitry for detecting and measuring peak voltage of the output pulses at the secondary winding, components controlling intensity of external magnetic field. Displacement of controlled objects in external magnetic field changes intensity of the magnetic field near the sensor. This displacement is measured by measuring peak voltage of the output pulses. The alternative current in primary winding induces positive and negative output pulses in secondary winding, remagnetizing the core along the hysteresis loop. For internal magnetic field core has closed magnetic circuit and for external magnetic field sensor has open magnetic circuit. External magnetic field modulates internal magnetic field, changes permeability of the core and remagnetization hysteresis loop area. Intensity of external magnetic field near the core depends on strength of external magnetic field, distance between source and sensor, polarity of source, relative position of source, sensor and controlled ferromagnetic object in external field. Device can read magnetic data on magnetic media including magnetic films (disks, tapes) allowing significantly increase density of magnetic data and speed of its retrieval, be used as high sensitivity, linearity and accuracy acoustic sensor (microphone, hydrophone, laryngophone, geophone), in automobile, mining, railroad, factory automation industries, machine tools etc.
REFERENCES:
patent: 2480265 (1949-08-01), Rubenstein
patent: 2991414 (1961-07-01), Tillman
patent: 3777255 (1973-12-01), Young et al.
patent: 4627292 (1986-12-01), Dekrone
Klimovitsky Alexandr M.
Klimovitsky Vladimir A.
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