Microphonic noise compensation for an ionization detector

摘要

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.