Single photon counting heterodyne detection method based on sequence reconstruction
A single photon counting and heterodyne detection technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as weakening signal amplitude strength, reduce subsequent processing time, increase overall efficiency, and facilitate processing.
Active Publication Date: 2018-11-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[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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[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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The invention discloses a single photon counting heterodyne detection method based on sequence reconstruction, and belongs to the field of laser radar detection. The method comprises the following steps that 1) a photon counting detector receives photons, generates a photon pulse sequence, and records a time interval of the pulse sequence; 2) the photon pulse sequence is reconstructed on the basisof the time interval of the pulse sequence to obtain a reconstructed pulse sequence; and 3) Fourier transform is carried out on the reconstructed pulse sequence in the step 2, and after that a powerspectrum is obtained, the maximum in the signal frequency band is determined to be a heterodyne signal frequency. The problem that mismatched time interval interferes in the heterodyne signal waveformcorresponding to the photon interval and weakens the signal amplitude in a present single photon heterodyne detection technology is solved.
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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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