Patent ID: 9377356
Filing Date: 2016-06-28
CPC Classification: G01J,H04B

Claim Text:
1. A conditioning circuit for conditioning an output of a photon detector gated with a periodic gating signal, the output signal comprising voltage spikes generated in response to single photons and a periodic component corresponding to the periodic gating signal, wherein the voltage spikes are superimposed on the periodic component, the conditioning circuit comprising: a signal divider to divide an output signal of the photon detector into a first part and a second part, wherein the first part is substantially identical to the second part; a delay line to delay the second part with respect to the first part by an amount selected according to the period of the periodic component; a combiner to combine the first part and the delayed second part of the signal such that the delayed second part is used to cancel periodic variations in the first part of the output signal; and a filter configured to attenuate signal components of the output signal.