Ortec, Inc.

Michael O Bedwell

Charles L Britton, Jr

Thomas H Becker

An automatic pole-zero adjustment circuit is provided for an ionizing radiation spectroscopy system which comprises a pole-zero network circuit, coupled to the system and having an electrical chracteristic which varies as a function of an input control signal, for permitting pole-zero adjustment of the system; a sampling circuit coupled to the system, for sampling a segment of the trailing edge of random pulses passing through the system; and a control signal circuit coupled to the sampling circuit, for generating the input control signal as a function of the sampling to permit cancellation by the pole-zero network circuit of undershoot in the system. The pole-zero network circuit may include a real pole in the signal path of the network circuit set coincident with the real pole of a high pass filter in the system itself. The control signal provided to the pole-zero network circuit is digitized.

Automatic pole-zero adjustment circuit for an ionizing radiation

A trigger pulse, derived for instance from a radiation detector, is applied to an input circuit which splits the pulse into two components. The respective component signals are acted on by two characteristic circuits, one of which attenuates the first signal component and the other of which delays the second signal component. The respective attenuated signal and delayed signal are applied to a passive element, such as a differential transformer to invert one component with respect to the other and to sum the resulting signals. The output signal of the differential transformer is a constant-fraction bipolar timing signal which is accurately correlated with the time of occurrence of the event identified with the trigger pulse.

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Concord, TN, United States of America

Michael O Bedwell