US 12,222,241 B2 · Method and apparatus for extracting avalanche signal

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.

Claims16

Dependent claims

A method for extracting an avalanche signal, comprising:

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.

2 more elements

An apparatus for extracting an avalanche signal, comprising:

an avalanche photodiode (APD) signal obtaining unit, configured to obtain an 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;
a spike position determining unit, configured to determine 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;
a coincidence gate adjustment unit, configured to shift 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
a coincidence discrimination unit, configured to extract, 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.

2 more elements

Dependencies are inferred from the claim text.

Method and apparatus for extracting avalanche signal

Life of this patent

Method and apparatus for extracting avalanche signal

Life of this patent

Abstract

Claims16