The Ionisation Chambers are used as sensor elements for automatic X-ray exposure control units. They comprise air-filled parallel chambers with 1 or 3 measuring fields, coupled with an amplifier and a field selector. The low overall thickness of 6 mm ensures the chamber may be used with all modern X-ray equipment.
The current generated in the sensor fields by the X-rays will be amplified, digitized and fed to the automatic exposure controller. The AEC supplies the cut-off signal to the generator, and thereby ensures an optimal and reproducible image quality, independent of the radiation quality, object density, and other factors.
The ionization chambers are supplied with a minimized chamber electronics, that amplify, digitize and process the generated current according to the field selection. The electronics also generate the chamber voltage without the need for an external high-voltage source.
In order to assure the backward compatibility with conventional interfaces a separate ramp module converts the pulses into a voltage ramp. This ramp module should be placed between interface cable and AEC interface on the generator site.