Precision scan position resolver for CT scanners

Details Precision scan position resolver for CT scanners Precision scan position resolver for CT scanners

1988-11-23

1990-04-10

Church, Craig E.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 15, H05G 160

Patent

active

049167189

ABSTRACT:
A scan frame (12) is mounted to a stationary frame (10) for rotation about a scan circle (14). A two speed resolver (20) has one circular core (36) mounted to the gantry and another circular core (32) mounted to the stationary frame. A primary winding (30a, 30b) on one of the cores receives AC excitation power from an excitation generator (58). Quadrature coarse resolution windings (54, 56) and quadrature fine resolution windings (50, 52) both in quadrature produce output signals indicative of the relative angle of the scan frame to the stationary frame. An angular position digitizing circuit (60) converts the analog sine/cosine signals into a digital angle signal.

REFERENCES:
patent: 4015129 (1977-03-01), Manring
"Synchro and Resolver Conversion" edited by G. Boyes, Chapter 1, pp. 1-32, 1980.
"Magnetic Pickups (Transducers)", General Catalog 0200, pp. 3-4.

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