公开(公告)号：US12222241B2

公开(公告)日：2025-02-11

申请号：US18684686

申请日：2022-08-12

Applicant: QUDOOR TECHNOLOGIES INC.

Inventor： Liuping Chen ,  Yongsheng Fan ,  Liting Tong ,  Xiangsheng She ,  Nan Li ,  Qibing Wang ,  Xiangkui Wan

IPC: G01J1/44 ,  H01L31/107

Abstract: The disclosure provides a method and apparatus for extracting an avalanche signal. The method includes: obtaining an avalanche photodiode (APD) signal output by a single-photon detector, wherein the APD signal comprises an upper spike and a lower spike, the upper spike is generated along with a rising edge of a gating signal, and the lower spike is generated along with a falling edge of the gating signal; determining a delay position of the upper spike in the APD signal, so as to determine a delay position of the lower spike in the APD signal based on a pulse width of the gating signal; shifting a coincidence gate signal, so as to align a delay position of a falling edge of the coincidence gate signal with the delay position of the lower spike in the APD signal, wherein a pulse width of the coincidence gate signal is smaller than the pulse width of the gating signal; and extracting, as the avalanche signal, a second pulse that is generated through an AND operation on a first pulse that is generated by a partial signal, exceeding a discrimination threshold, in the APD signal and the coincidence gate signal.