34 results about "Photon correlation" patented technology

The invention relates to the field of laser radars, and particularly discloses a high-speed small target detection system based on photon detection and a use method, and the system comprises a laser emission module, an optical module, a detection module and a control module. And the laser emission module is coaxially fixed with the detection module and is connected with the optical module and the control module. The laser transmitting module is used for receiving a synchronizing signal and transmitting pulsed light; the optical module is responsible for collimated emission of laser beams and collection of target echo signals; the detection module realizes accurate time marking of each photon event based on a single photon array detector and a time-to-digital converter; the control module is responsible for system synchronization control, timestamp data processing, space-time photon correlation analysis and real-time estimation and prediction of target three-dimensional motion parameters. The technical scheme provided by the invention has the advantages of high sensitivity, high time resolution, high refresh rate and strong anti-interference capability, and is suitable for real-time detection and trajectory reconstruction of high-speed small targets.

The application discloses a system and method for real-time recovery of high-speed long-distance communication signals by using photon correlation, comprising an optical transmitter, an arbitrary waveform signal generator, a 100-kilometer optical fiber, an optical receiver and a signal storage device; the optical transmitter and the optical receiver are connected by two paths, one of which is connected through the 100-kilometer optical fiber, and the other is connected through a cable; the arbitrary waveform signal generator and the optical transmitter are connected through the cable, and the signal storage device and the optical receiver are also connected through the cable; the application adopts the photon correlation technology, has good tolerance for the inter-symbol interference caused by dispersion of a communication carrier, and does not need an optical repeater, thereby reducing the photo-electric-optical conversion process of the optical repeater, greatly improving the communication distance and efficiency; the photon correlation technology has low requirements for the detection bandwidth of the communication carrier, and solves the problem of limited bandwidth of high-speed signals.

The application discloses a high-sensitivity X-ray imaging detector system based on photon counting, relates to the technical field of X imaging detection, and comprises a photon detection module, a photon processing module, a photon space-time feature integration module and a photon imaging reconstruction module; the photon detection module receives X-ray photons, and collects photon correlation detection data; the photon processing module calculates effective amplitude of photon energy signals and signal-to-noise ratio, distinguishes strong photons from weak photons, calculates correlation degree of weak photons in combination with space-time information and processes the weak photons in a targeted manner; the photon space-time feature integration module carries out partition interpolation according to photon space distribution density, and calculates comprehensive space-time energy values of grid units according to time characteristics of photon counting signals; the photon imaging reconstruction module suppresses noise, calculates a material attenuation coefficient, maps a gray-scale image, enhances edges, and outputs a high-sensitivity X-ray imaging result; the system improves weak photon utilization rate and space-time feature integrity, and enhances imaging definition.

An electron microscope of an embodiment according to the present invention includes an electron gun for irradiating a sample with electrons; an electron detector for detecting the electrons with which the sample is irradiated; a photon detector for detecting photons emitted from the sample when the sample is irradiated with the electrons; and a computing device that computes, for each of the detected photons, a time difference between the time of irradiation of the sample with the electron and the time of emission of the photon from the sample, based on the time of detection of the electron by the electron detector and the time of detection of the photon by the photon detector, and that computes electron-photon time correlation indicating the distribution of the time difference.