Method and apparatus for extracting avalanche signal
US12222241B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 2022 |
| Grant date | Feb 11, 2025 |
| Priority date | — |
| Expiry date | Aug 12, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2001/4466
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.