Stray magnetic field control system for vibration testing appara

Details Stray magnetic field control system for vibration testing appara Stray magnetic field control system for vibration testing appara

1988-11-10

1990-02-20

Chapman, John

Measuring and testing

Vibration

Vibrator

361149, G01M 700

Patent

active

049015796

ABSTRACT:
A stray magnetic field control system compensates for the generation of stray magnetic flux by the magnetic structure (body) of a load support shaker apparatus. The circuit includes a Hall effect magnetic field sensor for measuring the stray magnetic field, an amplifier/filter connected to the sensor output, and an A/D converter connected to the output of the amplifier filter. A degauss coil for compensating for the stray flux is energized by an SCR phase controlled power supply which is in turn controlled as to its triggering time by a microprocessor.

REFERENCES:
patent: 3062041 (1962-11-01), Spodnewski
patent: 3482163 (1969-12-01), Peek
patent: 4402032 (1983-08-01), Wilterdink

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