Microphonic noise compensation for an ionization detector

Details Microphonic noise compensation for an ionization detector Microphonic noise compensation for an ionization detector

1980-06-18

1982-09-07

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250385, 378 19, H01J 3928

Patent

active

043485898

ABSTRACT:
A device for measuring local X-ray absorption differences in a patient or other object has an array of ionization detector elements. Each detector element has a high voltage electrode. The high voltage source for each such electrode has associated with it an alternating voltage source in order to compensate for microphonic interference. The measuring circuit includes a demodulation compensation circuit for separation of the microphonic signal and for removing this interference from the measuring signal.

REFERENCES:
patent: 3339071 (1967-08-01), Fowler et al.
patent: 3400268 (1968-09-01), Amano
patent: 3424981 (1969-01-01), Erdman
patent: 3670833 (1972-06-01), Tomohiko et al.
patent: 3683189 (1972-08-01), Garrett
patent: 3991312 (1976-11-01), Whetten et al.
patent: 4048503 (1977-09-01), Taylor

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