319 results about "Photon detection" patented technology

The invention discloses a high-speed multi-photon detection system and method. The system comprises a detector and a signal processing circuit, wherein the detector is composed of a window plated with a photoelectric cathode, a micro-channel plate stack and an anode; a plurality of incident photons are converted into a plurality of photoelectrons by the photoelectric cathode, and the photoelectrons are converted into electron cloud by the micro-channel plate stack; the incident electron cloud is divided into multiple paths by three layers of staggered metal strip electrodes of the anode, and charge collection is carried out to obtain charge short pulses of each layer of electrode; the signal processing circuit converts the charge short pulses transmitted by the three layers of electrodes into digital pulse signals, obtains the centroid coordinates of the electron cloud from the digital pulse signals as the abscissa value, the ordinate value and the verification value of the incident photon position, combines the abscissa value, the ordinate value and the verification value based on the screening condition to obtain the target two-dimensional coordinates, and finally obtains the target two-dimensional coordinates. And transmitting to a terminal for imaging display. According to the invention, a plurality of synchronous photons can be detected, the overall counting rate of the detector is greatly improved, and the detection efficiency is improved.

The invention provides a light intensity measurement method and device based on single-photon detection and electronic equipment, and relates to the technical field of single-photon detection and laser radar imaging, and the method comprises the steps: collecting the arrival time information of photons in a plurality of single-photon detection events for each detection position; extracting a time sequence characteristic quantity related to the light intensity estimation based on the arrival time information; constructing a model input parameter for estimating the target light intensity based on the time sequence characteristic quantity; inputting the model input parameters into a light intensity estimation model, and predicting a light intensity estimation value of the target light intensity; and generating a corresponding light intensity distribution image according to the light intensity estimation value. According to the method, high-precision light intensity estimation can be realized only by a few photons, the requirements on the repeated detection times and the signal-to-background ratio are greatly reduced, and the imaging robustness is enhanced.

An example photon detection circuit, a SPAD sensing device, and a direct time-of-flight detection system comprising a SPAD sensing device configured to operate in a high illumination environments, are provided. The example photon detection circuit includes SPAD circuitry configured to generate a photon detection signal based on a SPAD bias voltage and the number of photons encountering the SPAD. The photon detection circuitry further includes output bias circuitry configured to generate a dynamic output bias signal, wherein the dynamic output bias signal is updated based on the number of photons encountering the SPAD. The example photon detection circuitry further includes output signal circuitry configured to generate a photon detection output signal in an instance in which the photon detection signal exceeds an output signal circuitry threshold, wherein the output signal circuitry threshold is based on the dynamic output bias signal.

The invention discloses a single-photon non-vision-field target tracking system based on an unmanned aerial vehicle platform, which belongs to the field of non-vision-field imaging and is characterized in that a laser is connected with a scanning galvanometer assembly through a first nanosecond optical path switch and an optical fiber circulator to form an emission optical path for emitting laser pulses to relay reflecting surfaces corresponding to four predetermined positioning points; the scanning galvanometer assembly is connected with the photon detector through the collimating optical fiber, the optical fiber circulator and the second nanosecond optical path switch to form a receiving optical path capable of receiving echo photons; the main control module is electrically connected with the laser, the first nanosecond light path switch, the second nanosecond light path switch, the scanning galvanometer assembly, the photon detector, the time-to-digital converter and the high-frequency inertial measurement unit respectively, and can control each component to perform laser ranging, double-window gating, single-photon detection, inertial measurement unit sampling and timing according to a unified time sequence; and the three-dimensional coordinates of the current non-vision target are calculated by using the distance measurement data through an ellipsoid intersection solution method, so that non-vision target tracking is realized.

The invention discloses a side slope displacement monitoring method and device based on quantum single photons and a medium, and belongs to the technical field of displacement monitoring. Rectangular light pulses are emitted periodically, echo detection is completed by using a single photon detector, a photon counting time sequence is constructed, wavelet denoising and reconstruction processing is performed on the photon counting time sequence, main peak position offset, energy change and form distortion are extracted to match multiple types of feature vectors, and feature fusion and resolving are performed through a multi-source feature fusion BP neural network. And finally outputting a high-precision slope displacement result. According to the method, the quantum single-photon detection technology is combined with the wavelet denoising and neural network fusion algorithm, noise interference is effectively suppressed, the displacement feature extraction precision is improved, and the method is suitable for high-precision and long-distance slope micro-deformation real-time monitoring.

The invention discloses a quantum partial discharge detection system and method based on single photon measurement. The system comprises a photoelectric detection module and an information transmission and processing module which are connected in pairs. A free space light collection unit in the photoelectric detection module is used for converging photons of partial discharge radiation and guiding the collected photons to a classic weak light detection unit and a single photon detection unit respectively; the classic weak light detection unit is used for converting an optical signal into an electric pulse signal based on an internal photoelectric effect; the single-photon detection unit is used for detecting extremely weak light and even single-photon events and outputting discrete electric pulse signals. The classical weak light detection unit and the single photon detection unit operate in parallel, partial discharge optical detection with a wide dynamic range and a high signal-to-noise ratio is realized through a signal fusion and processing algorithm, electromagnetic interference is effectively inhibited, and a more comprehensive and reliable monitoring means is provided for evaluation of the insulation state of power equipment.

The invention discloses a gas leakage detection imaging device and method based on a single photon detection technology, and belongs to the technical field of gas detection and imaging. Aiming at the limitation problems of the existing gas leakage detection technology in the aspects of sensitivity, response speed, space imaging capability and anti-interference capability, nanosecond modulation control and synchronous photon counting are realized by utilizing an FPGA (Field Programmable Gate Array) through a visual gas detection imaging device combining an SPAD (Single Program Amplifier) array detector and a WMS modulation-demodulation mechanism; and the second harmonic of the absorption signal is further extracted by combining digital phase-locked amplification, so that gas leakage three-dimensional imaging with high spatial resolution, ppb-level sensitivity, strong background suppression capability and high time response is realized. The system has the advantages of high detection sensitivity, real-time imaging capability with high spatial resolution, high background light interference resistance and high signal-to-noise ratio, the demodulation method is novel, and the modular design has multi-gas compatibility and system expansibility.

Improvements in and relating to Photonics An optical switch for receiving an optical signal from an optical signal source and for outputting the optical signal comprises an optical router configured for routing the optical signal conditional on the detection of a single photon. The optical router comprises and optical resonator, a first optical pathway part comprising the optical resonator, and a second optical pathway part. An optical input coupling part receives the optical signal for coupling the received optical signal into the first optical pathway part and into the second optical pathway part. An optical modulator coupled to a single-photon detector unit outputs a detection signal in response to the detection of a single photon. The optical modulator is configured, in response to the detection signal, to modulate the refractive index of the optical resonator to change an optical phase shift incurred by the optical signal upon passage through the optical resonator such that an optical interference results in a routing of the output optical signal to one of the first and second optical pathway parts selected conditional on the detection of a single photon.

The invention relates to an Imaging sensor device in a stacked arrangement comprising:a pixel array tier comprising a plurality of pixel segments each having a plurality of pixels for photon detection each providing a digital pixel output;a processing tier comprising a number of processing cores each associated with one of the plurality of pixel segments to receive the pixel outputs of the pixels of the respective pixel segment, wherein the processing cores are each in bidirectional communication with one or more neighboring processing cores,wherein the processing cores are each configured to receive pixel outputs of the pixels of the associated pixel segments and to distribute processing of pixel outputs between the processing core and the at least one of the neighboring processing cores as neighboring processing cores.

The invention relates to the technical field of photon detection imaging, in particular to a deep learning-based crossed strip-shaped anode single-photon detector imaging method, which comprises the following steps of: enabling incident photons to enter a crossed strip-shaped anode single-photon detector to obtain charge signals on a crossed strip-shaped anode in the detector; sampling the charge signal; inputting the obtained sampling data into a trained decoding network model to obtain a predicted position of an incident photon; establishing an imaging matrix, mapping the obtained prediction position into the imaging matrix, and performing interval division on the mapped imaging matrix; and carrying out gray value mapping on the number of photons in the divided intervals to obtain an imaging result. According to the invention, the neural network model is introduced to carry out computational imaging, so that the imaging quality of the cross strip-shaped anode single-photon detector is improved.

The invention relates to a data compression circuit and method suitable for a single photon avalanche diode array, and the circuit comprises a pixel array which is provided with M rows and N columns of pixels; the multi-stage compression circuit comprises a plurality of compression cache circuits connected in sequence, each stage of compression cache circuit comprises a plurality of first storage areas used for storing TDC data and address bits used for storing the positions of pixels corresponding to the TDC data in the pixel array, and the multi-stage compression circuit reads the TDC data of the pixel array line by line. And after multi-stage compression, the signals are output to a post-stage circuit. Compared with the prior art, the pixel data in a digital form is greatly compressed, the data transmission quantity is reduced, the data transmission bottleneck problem of a large-scale array is solved, and a key technical support is provided for a high-performance single-photon detection system.

To provide a quantum key delivery system capable of detecting wiretapping without utilizing a bit error rate, and a quantum key delivery method.SOLUTION: In a quantum key delivery system, a transmitter system comprises a transmission signal generation device for transmitting to a receiver system a transmission signal in which a decoy pulse is inserted at random in a signal pulse of which a phase of each pulse is 0 or π, and a decoy pulse information transmission device for generating a second signal relating to the decoy pulse and transmitting the second signal to the receiver system based on a first signal relating to a time slot on which photon detection is performed. The receiver system comprises a transmission signal detection device for performing the photon detection in response to a phase of the transmission signal, to which a delay time is given, and a simultaneous photon detection rate verification device for verifying a simultaneous photon detection rate in a time slot, in which the signal pulse and the decoy pulse interfere, in response to receiving the second signal.SELECTED DRAWING: Figure 3

The invention relates to the technical field of photon detection, in particular to an environment interference identification method and system for sample analysis and a sample analyzer. According to the scheme, firstly, the photometric curve data of the target object to be measured are obtained, then, the photometric curve data are input into the preset feature model for feature parameter extraction, at least one feature parameter is extracted, then, the extracted feature parameters are analyzed to obtain the analysis result, and finally, the analysis result is obtained. And determining whether the photometric curve data of the target to-be-measured object is interfered by the environment according to the analysis result. By adopting the above scheme, the photometric curve data abnormity caused by environmental interference in any link of sample analysis can be detected, and the accuracy of the detection result can be ensured while the abnormal result can be efficiently detected by using the feature model, so that the accuracy of the detection result is improved. And the risks of false negative and false positive in clinical diagnosis are effectively reduced.

Embodiments of the present application provide a detector device including a photon detector and a multilayer reflector. The photon detector includes a substrate, an isolation structure in a first side of the substrate, a guard ring adjacent to the isolation structure and in the first side of the substrate, a sensor node in the first side of the substrate, the guard ring between the sensor node and the isolation structure, a shared node in the first side of the substrate, the shared node between the guard ring and the isolation structure, an isolation extension structure in a second side of the substrate opposite the first side, the isolation extension structure extending from the second side to the isolation structure. The multilayer reflector is on the first side of the substrate. Using the multilayer reflector can improve collection of photons in an avalanche region.

The application belongs to the field of spectral measurement and imaging, and specifically discloses a single-photon detection device and a rapid spectral and imaging system based on the same. According to the application, a transmission optical fiber spectrometer separates each waveband complex light according to wavelength in space, and couples the photons of different wavelengths into an optical fiber array for time delay, so that the different wavelengths are delayed to different time points and output to a single-photon detection device. The single-photon detection device converts the photons of different wavelengths arriving at the device in time sequence into electrical signals, and obtains the number of photons at different time points after amplification and signal processing, and converts the number of photons into a spectrum. Since the transmission spectrometer can provide higher diffraction efficiency, higher spectral resolution and signal strength, the single-photon detection device can provide a faster and more accurate photon discrimination and photon counting method, and compared with the prior art, the whole can measure the spectrum more quickly, and has higher spectral resolution and signal strength.

The application discloses a portable fluorescence lifetime detection device based on a SiPM array and an on-chip TDC, and relates to the technical field of fluorescence lifetime detection devices, and comprises the following modules: an excitation light source module, which is used for sending a synchronous electric pulse signal to a time measurement module while triggering a sub-nanosecond excitation pulse, the signal being a starting timing signal for time measurement of the time measurement module, and the excitation pulse being used for exciting a sample to be measured to generate a fluorescence signal; a detection module, which is used for collecting the fluorescence signal and obtaining a photon detection signal, and outputting each photon detection signal to the time measurement module; the time measurement module, which is used for measuring a time interval from the synchronous electric pulse signal to each photon detection signal to generate a timestamp sequence and then sending the timestamp sequence to a data processing and control module; and the data processing and control module, which is used for generating a fluorescence decay curve and a fluorescence lifetime prediction result of the sample according to the timestamp sequence. The application can meet the application requirements of portability, low cost, high stability and high accuracy.

Array single photon detection and two-dimensional camera common path fusion device and pixel matching method belong to the field of optical precision measurement. The array single photon detection and two-dimensional camera common path fusion device comprises a signal generator, a laser, an emitting optical system, a receiving optical system, a dichroic mirror, a two-dimensional camera, an array single photon detector, an array single photon counter and a data acquisition and processing fusion module. The method of the present application is as follows: the array single photon detection waveband pulsed laser and the two-dimensional camera sensing waveband ambient light returned by the target object are separated by using a common receiving optical path and a dichroic mirror to determine the pixel size and the number of the array single photon detector and the two-dimensional camera; the transmission light offset d is calculated according to the thickness of the dichroic mirror; the transmission light offset d is used as a correction factor to realize the pixel matching of the array single photon detection three-dimensional imaging and the two-dimensional camera image; the array single photon detection three-dimensional image and the two-dimensional camera image are superimposed, and the high resolution of the two-dimensional image is used to enrich the three-dimensional point cloud imaging information.

The application discloses a single-photon source anti-bunching measurement device and method, relates to the technical field of single-photon detection, and comprises a single-photon source module, a signal trigger light path module, an interference light path module, a single-photon detector module and a coincidence counting module. The single-photon detector module comprises a first gated single-photon detector, a second gated single-photon detector, a first single-photon detector and a second single-photon detector, and can realize accurate measurement of the anti-bunching value of a deterministic single-photon source and a heralded single-photon source.

An optical data symbol detection circuit (90) comprises: - at least one single-photon detection circuit (100) configured to generate trigger events (d1) in response to an incident light signal comprising photons, the incident light signal encoding data symbols; - a reference signal generator (105) configured to provide a reference demodulation signal (Vdemod); - a discrimination mechanism (125) configured to identify trigger events based on their temporal alignment with the reference demodulation signal (Vdemod); and - at least one correlation system (126) configured to adjust the contribution of each identified trigger event to an output signal (Vsymbol) based on its synchronization with the reference demodulation signal (Vdemod).

The invention discloses a high over-bias variable load type quenching device for a single photon avalanche diode, and the device comprises a quenching unit which is used for changing the resistance of a variable load tube to infinity to rapidly cut off the avalanche current when the single photon avalanche diode is avalanche, thereby achieving the variable load type quenching; the reset unit is used for generating a delay-adjustable reset signal after quenching is completed, and controlling the single photon avalanche diode to recover to a to-be-detected state; and the high over-bias supporting unit is used for enabling the two ends of the single photon avalanche diode to obtain over-bias higher than the power supply voltage under the low-voltage process. The quenching and resetting time of the quenching circuit is effectively shortened through a simple circuit structure, and meanwhile, the photon detection probability can be greatly improved through the high over-bias voltage which is nearly twice of the power supply voltage.

The invention relates to colloidal quantum dots on a silicon photomultiplier microcell matrix. The techniques employ colloidal quantum dots (CQDs) in which a CQD layer is disposed on an array of SiPM microcells of an image sensor for an imaging module. The CQD layer and the microcell array are individually biased. A method includes biasing a CQD layer of an imaging module at a first voltage, and biasing an array of photomultiplier microcells at a second voltage. Upon receiving photons, the CQD layer generates charge in response. Charge moves from the CQD layer into the array, where at least one photomultiplier microcell amplifies the charge. A signal is then output from the imaging module in accordance with the amplified charge. This method can significantly improve the photon detection efficiency of the imaging element, which can be used in a wide range of applications such as lidar, medical imaging and night vision or in other weak light imaging scenarios.

To provide a technique of photon detection efficiency (PDE) modulation with multi-junction single-photon avalanche diode (SPAD) pixels.SOLUTION: A sensing device includes an array of sensing elements and a bias control circuit. Each sensing element of the array of sensing elements includes (i) a photosensitive material, which is configured to generate photoelectrons in response to incident optical radiation, and (ii) a plurality of avalanche diodes, which are disposed at different, respective locations within the sensing element in electrical communication with the photosensitive material and are configured, when reverse-biased, to generate electrical avalanches in response to the generated photoelectrons. The bias control circuit is configured to selectively set respective reverse-bias voltage levels of the avalanche diodes within each sensing element to different, respective values.SELECTED DRAWING: Figure 1

The invention discloses a traveling wave microwave light quantum detection method and system and a superconducting quantum circuit, and the method comprises the steps: building a three-level dimer coupled wQED system model; based on the system model, obtaining an equation set containing the input and output relation of the system model and a photon detection efficiency expression; acquiring a key parameter group based on the equation set and the photon detection efficiency expression; and adjusting the structure and the coupling relationship of the system model according to the key parameter group, and realizing traveling wave microwave light quantum detection based on the adjusted system model. In the invention, the brand-new three-level dimer coupled wQED system model is provided, and the structure and the coupling relationship are adjusted under the condition of reasonably setting a key parameter group, so that large-bandwidth high-efficiency detection is realized in principle by using the number of atoms which is far less than that of atoms in a traditional scheme; the physical resources are greatly saved, and the complexity of the system is simplified.

A computing system can be configured for low-photon-count visual object classification. The computing system can include a photon-detection system that includes one or more cells. Each of the one or more cells can include one or more photon detectors. Each of the one or more photon detectors can be configured to output a photon signature in response to a photon incident on the one or more photon detectors. The computing system can include one or more processors and one or more storage devices storing computer-readable data. The data can include a low-photon-count classification model and one or more instructions that, when implemented, cause the one or more processors to perform operations for low-photon-count visual object recognition. The operations can include obtaining a photon signature from the photon-detection system. The operations can include providing the photon signature to the low-photon-count classification model. The operations can include determining, by the low-photon-count classification model, a classification of a visual object placed in a field of view of the photon-detection system based at least in part on the photon signature. The operations can include providing the classification as an output of the low-photon-count classification model.

A single Geiger avalanche photodiode pixel interconnected with a readout circuit is decomposed to form M * M parallel pixel structures, the M * M parallel pixel structures are connected to a single pixel input stage of the readout circuit, and the time complementation relation between pixel avalanche events is utilized to enlarge the pixel avalanche events. The detection probability of the array single-photon detector pixel is improved, the photon detection dynamic range is expanded, the upper limit of the pixel photon saturation counting rate of the array single-photon detector can be remarkably improved, and the method is applied to the fields of high-dynamic-range laser three-dimensional imaging, space laser communication and the like.

The invention provides a detection system of a composite silicon photomultiplier staggered array. The device is characterized by comprising a composite silicon photomultiplier array module (1), a dual-channel reading module (2), an ambient light monitoring module (3), a fusion control module (4), a multi-path bias power supply module (5), a high-sensitivity sub-array (6), a high-dynamic range sub-array (7), a metal bus line (8), a signal output channel 1 (high-sensitivity) (9), a signal output channel 2 (high-dynamic) (10) and a ceramic substrate (11). The system can be used for solving the technical problems that an existing single-type silicon photomultiplier detection system is low in photon detection efficiency under weak light and limited in dynamic range under strong light, and can be widely applied to the technical field of photoelectric detection with requirements for the dynamic range and sensitivity, such as automatic driving laser radar, biological fluorescence imaging and high-energy physical detection.

The present invention relates to a method of manufacturing a backside illumination (BSI) CMOS optical sensor and more specifically to a method of reducing the cross talk and enhance the photon detection efficiency (PDE) in a backside illumination (BSI) CMOS optical sensor. In particular the claimed method comprises the step of creating an isolation structure between the adjacent sensing elements of the pixel-array of said BSI CMOS optical sensor, so as to isolate all the adjacent sensing elements from each other, and the step of creating a common voltage backside applying structure to all the sensing elements of said pixel-array, so as to connect all the sensing elements to a common voltage bias.

The application discloses a kind of missing carton detection and rejection systems on carton lifting conveying mechanism, and relates to the technical field of carton cigarette quality detection.It includes photon detector, push-out mechanism, push-out mechanism is arranged at one side of carton lifting conveying mechanism, and the other side of carton lifting conveying mechanism is provided with rejection outlet, and collection transfer mechanism is also provided at rejection outlet;Push-out mechanism includes gas storage tank, gas outlet nozzle arranged towards rejection outlet, and solenoid valve on the connecting pipeline between gas outlet nozzle and gas storage tank.The missing carton detection and rejection system of the present application on carton lifting conveying mechanism is to achieve the purpose of automatically and quickly detecting missing carton and automatically and quickly rejecting missing carton under the premise of ensuring carton conveying efficiency.

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.

A photoelectric conversion apparatus and a photoelectric conversion system including the same are disclosed. An exposure controller, a timing generator, a measurer, and a pulse controller are provided. The exposure controller generates a signal defining a plurality of second exposure periods, the plurality of second exposure periods being included in a first exposure period corresponding to one frame and each second exposure period being shorter than the first exposure period. The timing generator generates a pulse signal defining time information within each second exposure period. The measurer counts the pulse signal at or after a first photon detection in the second exposure period based on the pulse signal generated by the timing generator. The pulse controller performs count control of the pulse signal in a subsequent second exposure period of the second exposure periods based on a value of the measurer.