Method or generating a rotating elliptical sensing pattern

Details Method or generating a rotating elliptical sensing pattern Method or generating a rotating elliptical sensing pattern

1996-02-12

1998-08-11

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

32420717, 32420726, 324232, 324239, 327106, G01N 2772, G01B 700, G06F 102, H03B 2800

Patent

active

057932042

ABSTRACT:
A method of increasing the spatial resolution of polar coordinates sensor devices by phase-amplitude modulating the sine-cosine excitation signals to the hollow toroid driving core. A rotating elliptical sensing pattern is generated by digital synthesis means. Values of the elliptical sensing pattern and its complete revolution are stored in digital "look-up" tables and sequentially read at a high rate into two digital-to-analog converters to produce two "staircase" approximations of the sine-cosine waveforms. The ellipse generation has a first angular frequency and the ellipse precession has a second sub-multiple frequency.

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