Electricity: measuring and testing – Magnetic – Displacement
Patent
1993-09-22
1996-07-30
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
324661, 324260, 324256, 324226, 73DIG4, G01R 3302
Patent
active
055415075
ABSTRACT:
A magnet position detector, particularly for implantable medical devices, has a resiliently supported coil, a current source delivering a current to the coil and a detecting device for detecting the movement of the coil in a magnetic field when fed with an electric current from the current source. The coil has a core with a non-linear B-H curve and the current source is a pulse source delivering current pulses with at least one positive and one negative side. The detecting device detects the movements of the coil in opposite directions respectively excited by differentiated signals respectively corresponding to the leading and trailing edges and permits the magnitudes of the respective, oppositely directed movements to be compared to each other, thereby indicating the position of a source of the magnetic field, relative to the coil, to be determined. The magnitudes of the oppositely directed movements can be measured by analyzing signals from a piezoelectric element attached to the coil for co-movement therewith, by analyzing the position of light beam reflected from a surface which co-moves with the coil, or by analyzing the change in capacitance of a capacitor having one plate which co-moves with the coil.
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"A Vibrating Cantilever Magnetic-Field Sensor," Hetrick, Sensors and Actuators, vol. 16, No. 3 Mar., 1989, (pp. 197-207).
Pacesetter AB
Patidar Jay M.
Snow Walter E.
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