A Single Photon Counting Heterodyne Detection Method Based on Sequence Reconstruction

A technology of single photon counting and heterodyne detection, applied in radio wave measurement systems, instruments, etc., can solve the problem of weakening the signal amplitude strength, reduce the time of subsequent processing, increase the overall efficiency, and facilitate processing

Active Publication Date: 2021-03-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The object of the present invention is to provide a single-photon counting heterodyne detection method based on sequence reconstruction, which solves the heterodyne signal waveform corresponding to the mismatch time interval interference photon interval generated by the existing single-photon heterodyne detection technology, Diminished Signal Amplitude Strength Issues

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  • A Single Photon Counting Heterodyne Detection Method Based on Sequence Reconstruction
  • A Single Photon Counting Heterodyne Detection Method Based on Sequence Reconstruction
  • A Single Photon Counting Heterodyne Detection Method Based on Sequence Reconstruction

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Embodiment 1

[0080] A method for single photon counting heterodyne detection based on sequence reconstruction provided by a preferred embodiment of the present invention comprises the following steps:

[0081] Step 1: Receive photons by photon counting detector, generate photon pulse sequence, and record the pulse sequence time interval, such as Figure 4 The distribution of the pulse train shown, Figure 6 The pulse sequence simulation diagram shown and Figure 8 The power spectral distribution of the pulse train is shown by Figure 8 It can be seen that it is relatively difficult to detect heterodyne frequency signals at present, and the photon pulse sequence is expressed as:

[0082]

[0083] Among them, K=N S +N LO , K is the total number of photons; δ(.) is the delta function; t k is the arrival time of the kth photon;

[0084] Step 2: Reconstruct the photon pulse sequence based on the time interval of the pulse sequence to obtain the reconstructed pulse sequence, such as F...

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Abstract

The invention discloses a single-photon counting heterodyne detection method based on sequence reconstruction, which belongs to the field of lidar detection and comprises the following steps: 1. receiving photons with a photon counting detector, generating a photon pulse sequence, and recording the time interval of the pulse sequence 2. Reconstruct the photon pulse sequence on the basis of the pulse sequence time interval to obtain the reconstructed pulse sequence; 3. Carry out Fourier transform to the reconstructed pulse sequence in step 2, after obtaining the power spectrum, take the maximum The value is determined as the heterodyne signal frequency, and the invention solves the problem that the mismatched time interval generated by the existing single-photon heterodyne detection technology interferes with the heterodyne signal waveform corresponding to the photon interval and weakens the signal amplitude strength.

Description

technical field [0001] The invention belongs to the field of laser radar detection, relates to the field of laser single photon technology heterodyne detection, in particular to a single photon counting heterodyne detection method based on sequence reconstruction. Background technique [0002] Single-photon detection technology means that when even a single photon reaches the detector, the detector outputs a pulse signal. The principle of single-photon heterodyne detection technology is as follows: figure 2 and image 3 as shown in figure 2 The schematic diagram of the pulse signal is shown. When the trough of the heterodyne signal (sine wave or cosine wave) arrives, the distance between the pulse signals output by the detector is the largest; and when the peak of the heterodyne signal arrives, the distance between the pulse signals is the smallest. [0003] Due to the detection of extremely weak signals at the level of single photons, the time when photons arrive at the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/48
CPCG01S7/4802
Inventor 董洪舟刘水杨春平敖明武
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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