X-ray or gamma ray systems or devices – Photographic detector support – For plural exposures on single film or plate
Patent
1989-04-17
1990-05-15
Church, Craig E.
X-ray or gamma ray systems or devices
Photographic detector support
For plural exposures on single film or plate
378167, G03B 4202
Patent
active
049264559
ABSTRACT:
A system and method is disclosed for minimizing residual vibration of a radiographic system due to rapid movement of a radiographic film cassette between a park and expose position. The cassette is moved by a servo system including a servo motor which is responsive to a voltage input waveform to drive the cassette. A waveform is chosen for the voltage input such that no inpulse derivatives appear until the waveform has been diferentiated at least three times. The primary natural resonant frequency of the system is determined and noted. The duration of the selected input waveform is adjusted such that the frequency spectrum of the adjusted input waveform defines a relative null which approximately coincides with the primary resonant frequency. The amplitude of the voltage input waveform is then further adjusted as a function of the distance to be traveled by the cassette between the park and expose positions. The servo system can optionally be operated over a portion of the cassette transit in a closed loop fashion. In a mechanical embodiment, sinusoidal cassette acceleration can be effected by the use of a mechanical drive linkage coupled between a motor and the cassette, the drive linkage employing a cycloidal cam and associated cam follower to govern the profile of cassette movement.
REFERENCES:
patent: 2912588 (1959-11-01), Berggren
patent: 3173011 (1965-03-01), Barrett et al.
Everett Dennis
Flanagan Patrick M.
Geither John
Hrdlicka Victor
Stojkov Mark
Church Craig E.
Picker International Inc.
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