CPC G01T 1/248 (2013.01) [A61B 6/032 (2013.01); G01T 1/1603 (2013.01)] | 4 Claims |
1. A method comprising:
measuring signals of an avalanche photodiode (APD) working in a linear mode when the APD receives no radiation and a compensation for a leakage current of the APD is present;
when the signals exceed a first level, commencing a time delay;
measuring the signals of the APD at an end of the time delay; and
when the signals at the end of the time delay exceed a second level, increasing the compensation for the leakage current.
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