983 results about "Photocurrent" patented technology

This invention provides an electromagnetic field detector, a system comprising the electromagnetic field detector, and a method of operating an electromagnetic field detector, the electromagnetic field detector comprising a first optical signal interface configured to receive, from one or more remote optical sources, a first optical signal; an electromagnetic field transmitter configured to transmit a local oscillator electromagnetic field generated from the first optical signal, the electromagnetic field transmitter comprising: a photocurrent generator configured to generate a photocurrent from the first optical signal; and an antenna interface configured to supply the photocurrent to an antenna to transmit the local oscillator electromagnetic field; a second optical signal interface configured to receive, from the one or more remote optical sources, a probe optical signal and a coupling optical signal; and a transmission medium configured to be excited by the probe optical signal and further excited by the coupling optical signal, wherein the probe optical

The invention relates to the technical field of biomedical sensing and health monitoring, and discloses a noninvasive glucose detection system. The system comprises an interstitial fluid extraction device, a photoelectric sensing module and a main control circuit which are integrated on a flexible substrate. The interstitial fluid extraction device drives subcutaneous interstitial fluid to migrate to the hydrogel interface layer under the action of reverse ion electroosmosis; the photoelectric sensing module receives interstitial fluid through a hydrogel interface layer, a working electrode of the photoelectric sensing module comprises a Cu monatomic imprinting recognition layer, and imprinting holes formed by Cu monatomic sites are specifically coordinated with glucose molecules. The master control circuit controls sampling and determines the glucose concentration based on the photocurrent signal. Noninvasive sampling and monatomic imprinting photoelectric detection are fused, sampling-detection integration is achieved, and the device has the advantages of being noninvasive, painless, high in selectivity, high in interference resistance, comfortable to wear and the like and is suitable for continuous monitoring of blood glucose.

The invention discloses a motion recognition method and system based on a redox photoelectric memristor, a terminal and a storage medium, and the method comprises the steps: selecting classical motions based on a human body motion data set, extracting time sequence data, and coding the time sequence data into an optical pulse sequence; constructing a reservoir array composed of a plurality of photoelectric memristors, and expanding an optical pulse sequence signal into a high-dimensional state vector; constructing a supervised training model, solving a weight matrix, and constructing a memristive cross array; and outputting an action classification result through simulation domain operation based on the output current multi-path light current signals in combination with the memristor cross array. According to the method, the motion features can be directly fed into a rear-end classification network for action recognition without depending on a complex digital feature extraction algorithm, so that the transmission and processing overhead of redundant data is fundamentally eliminated; a high-efficiency, low-delay and high-robustness hardware solution is provided for real-time and anti-noise motion recognition in scenes such as intelligent monitoring and man-machine interaction.

A transimpedance amplifier device for an optical receiver disclosed by the present invention comprises a bias circuit, a transimpedance amplifier and an amplification driving circuit which are connected in sequence, the bias circuit comprises an upper bias structure and a lower bias structure, and the upper bias structure and the lower bias structure are both connected with the transimpedance amplifier to generate different bias currents. It is ensured that the photodiode PD1 can be conducted and generate light current when light passes through the photodiode PD1, the transimpedance amplifier is used for converting the current into voltage to be output, and the amplification driving circuit is used for amplifying the voltage. According to the optical receiver circuit, micro current generated by the photodiode can be converted into output voltage in a relatively high output range through the transimpedance amplifier, and compared with a traditional optical receiver circuit, the optical receiver circuit is relatively low in cost in circuit structure and has the advantages of low power consumption and high reliability. The driving capability of the circuit can be improved under the condition that a complex amplifier loop and a photoelectric conversion module are not needed, the output voltage in a high range is output, and the performance and the stability are further enhanced.

This invention provides an electromagnetic field detector, a system comprising the electromagnetic field detector, and a method of operating an electromagnetic field detector, the electromagnetic field detector comprising a first optical signal interface configured to receive, from one or more remote optical sources, a first optical signal; an electromagnetic field transmitter configured to transmit a local oscillator electromagnetic field generated from the first optical signal, the electromagnetic field transmitter comprising: a photocurrent generator configured to generate a photocurrent from the first optical signal; and an antenna interface configured to supply the photocurrent to an antenna to transmit the local oscillator electromagnetic field; a second optical signal interface configured to receive, from the one or more remote optical sources, a probe optical signal and a coupling optical signal; and a transmission medium configured to be excited by the probe optical signal and further excited by the coupling optical signal, wherein the probe optical signal has a probe frequency set to excite electrons of the transmission medium to a first excited state and the coupling optical signal has a coupling frequency set to excite electrons of the transmission medium to a predetermined Rydberg state so as to induce an Electromagnetic Induced Transparency, EIT, effect, wherein the transmission medium is further configured to receive a phase-modulated electromagnetic field from a remote transmitter and the local oscillator electromagnetic field such that the combination of the phase-modulated electromagnetic field and the local oscillator electromagnetic field causes a change in the probe optical signal from which a phase state of the phase-modulated electromagnetic field can be detected.

The invention discloses a photoelectrocatalysis ammonia synthesis control method and system based on closed-loop parameter optimization. The method comprises the following steps: establishing and verifying a system reference state; after the reference state is established, closed-loop feedback control is performed on the temperature and the light current, so that the temperature and the light current are kept in a stable state; after the temperature and the light current reach a stable state, collaborative optimization is carried out on target parameters; and safety monitoring is carried out on the whole process of ammonia synthesis. The key bottlenecks of process instability, low optimization efficiency, poor data reliability and high safety risk in the photoelectrocatalysis ammonia synthesis industrialization process are solved by constructing a full-process unmanned intervention closed-loop control system covering system self-inspection, parameter stability control, intelligent optimization and safety protection.

The invention relates to a magnetic field sensor based on a room-temperature two-dimensional magnetic semiconductor material and a preparation method and application thereof, and the preparation method comprises the steps: arranging two electrodes which are not communicated with each other on an insulating substrate, obtaining a layered iron gallium tellurium material, transferring the layered iron gallium tellurium material to the insulating substrate, enabling at least one layered iron gallium tellurium material to be separated from the insulating substrate, and enabling the layered iron gallium tellurium material to be separated from the insulating substrate. The first product covers the two electrodes at the same time, tetrabutylammonium cations or oxygen plasmas are used for carrying out an intercalation reaction on the layered iron gallium tellurium material of the first product, and the layered iron gallium tellurium material of the first product is converted into an intercalated layered iron gallium tellurium material; and performing vacuum annealing to obtain the magnetic field sensor. The sensor provided by the invention reflects the magnetic field intensity by using the polarized light current between the electrodes, and can realize wide-range and high-precision magnetic field detection.

The invention relates to the technical field of optical fiber communication, and discloses a non-intrusive optical fiber optical power measuring system. According to the method, leakage light is generated through micro bending of an optical fiber, high-sensitivity amplification is performed on leakage light current by adopting an AD8304 logarithmic amplifier, and the measurement range of micro current is expanded in combination with an intercept adjustment technology; leakage optical signals in two directions at the micro-bend position are collected through a left-right dual-channel analog-to-digital converter (ADC), and accurate real-time monitoring of optical power is achieved through a digital processing module and a remote control module. The system comprises an optical fiber clamp module, a photoelectric conversion module, a logarithmic amplification circuit, a dual-channel ADC module and a remote control unit, and measurement is completed on the premise that normal communication of optical fibers is not affected at all. The problem that a communication link is interfered by traditional intrusive measurement is solved, the dynamic range of the measured actual optical power reaches 50dB, the measurement error is low, and a high-reliability solution is provided for performance monitoring and maintenance of an optical communication system.

The invention relates to the technical field of biomedicine, discloses mutant photo-induced ion channel ChR-2 protein, and further discloses a nucleic acid construct, an expression vector, a cell, related application and a computer model. The light-sensitive channel ChR2 protein mutant obtained by the invention has stronger light current, and the light-sensitive capability of the light-sensitive channel ChR2 protein mutant is at least improved by 100 times; besides, the invention also obtains a nucleotide sequence for coding the light-sensitive channel ChR2 protein mutant, constructs a recombinant expression vector, and obtains the light-sensitive channel ChR2 protein with higher expression quantity and stronger light sensitivity, and the light-sensitive channel ChR2 protein is very suitable for expression in cells of mammals (especially human); according to the invention, the rhodopsin in different channels is systematically studied by modifying the position G224 in the helix 6 of seven transmembrane helix motifs, which proves that the mutation of the position G224 in the helix 6 in WT ChR2 accelerates the photosensitivity of the channels, and the considered position is homologous in the helix 6 of the rhodopsin in different channels.

The invention relates to the technical field of quantum sensing, and discloses a quantum magnetometer device based on diamond NV color center photoelectric detection magnetic resonance. Wherein the optical path module performs optical excitation and imaging positioning on a diamond sample through a laser and an objective lens. The circuit module integrates a microwave source, a lock-in amplifier, a low-noise current amplifier and a programmable power supply, applies a microwave field and bias voltage to a microwave antenna and an interdigital electrode on the surface of a sample respectively, and collects sample dependency photocurrent signals. And the operation module realizes automatic control and data processing of the system. According to the device, NV color center spin state information is converted into a photocurrent signal through a photoelectric detection magnetic resonance mechanism, an amplitude or frequency modulated signal is demodulated by using a lock-in amplification technology, information of a detection magnetic field is obtained through a high signal-to-noise ratio photoelectric detection magnetic resonance spectrum, and the sensitivity of the magnetic field is evaluated. Magnetic resonance signals are detected in an all-electricity mode, a complex optical system of traditional fluorescence detection is simplified, and the device has the advantages of being compact in structure, easy to integrate, high in measurement sensitivity and the like.

A method for processing a radar signal based on a photonic fractional Fourier transformer comprises: transmitting a linear frequency modulation signal to targets to be detected, receiving echo signals of the targets to be measured, and loading the linear frequency modulation signal and the echo signals onto a single-frequency optical wave by an electro-optical modulator (S1); respectively biasing a sub-modulator and a parent modulator of the electro-optical modulator at different bias points, modulating the single-frequency optical wave by the electro-optical modulator based on the linear frequency modulation signal and the echo signals, and outputting a modulated optical signal (S2); converting the modulated optical signal by a photoelectric detector to a photocurrent (S3); and performing Fourier transform on the photocurrent to obtain a fractional Fourier spectrum, and obtaining distance information of the targets to be measured according to peak positions of each pulse signal in the fractional Fourier spectrum (S4).

The invention discloses a magnetic sensor, a sensing measurement system and a magnetic field measurement method, and relates to the technical field of magnetic field measurement, the magnetic sensor comprises an excitation light source, a light path collection assembly, a fluorescence detector and a shielding shell, and the excitation light source, the light path collection assembly and the fluorescence detector are fixedly arranged in the shielding shell in sequence; the light path collection assembly comprises an NV color center diamond, a magnetic field bias module and a fluorescence convergence assembly, the magnetic field bias module can provide a bias magnetic field for the NV color center diamond, the NV color center diamond can emit fluorescence under the action of the exciting light and the bias magnetic field, and the fluorescence convergence assembly can converge the fluorescence emitted by the NV color center diamond to collect the fluorescence emitted by the NV color center diamond. The fluorescence detector can receive the fluorescence converged by the fluorescence convergence assembly, and can transmit a light current signal obtained by detecting the fluorescence to the signal acquisition system; according to the invention, volume miniaturization can be realized conveniently, scene adaptability, anti-interference capability, precision stability and reliability are improved, and use cost is reduced.

An electro-optic receiver includes a bus optical waveguide and a plurality of wavelength division multiplexing (WDM) receiver slices positioned along the bus optical waveguide. Each of the plurality of WDM receiver slices includes a WDM element optically coupled to the bus optical waveguide, a photodetector, and a receiver circuit. The photodetector is optically connected to the WDM element by both a first optical connection and a second optical connection. The WDM element conveys a first component of input light through the first optical connection to the photodetector, and a second component of input light through the second optical connection to the photodetector, where first and second components of input light travel in opposite directions through the bus optical waveguide. The receiver circuit generates an electrical data signal from photocurrents received from the photodetector.

The invention belongs to the technical field of immunoassay and biosensing, and provides a preparation method of a photoelectrochemical sensor based on CuO-induced photocurrent polarity reversal. The invention provides a preparation method of the photoelectrochemical sensor based on CuO-induced photocurrent polarity reversal. Specifically, hollow polyhedral flower-shaped CuO with a unique inner cavity structure is adopted as a polarity induction factor, so that multiple light refraction and scattering effects are remarkably enhanced, and the light capture efficiency is improved. Besides, when CuO is introduced to the surface of the In2O3 / ZnCdS electrode as a photocurrent polarity reversal factor, due to the energy band structure difference between CuO and In2O3 / ZnCdS, the migration path of a photon-generated carrier is changed, and the photocurrent polarity is reversed from an anode to a cathode photocurrent, so that the detection specificity of the gastrin-releasing peptide is improved. The photocurrent polarity reversal strategy effectively eliminates potential false positive signal interference, and the accuracy and sensitivity of detection are remarkably improved. According to different photoelectrochemical signal intensities of to-be-detected substances with different concentrations, the gastrin-releasing peptide is detected.

The invention relates to the technical field of AMOLED display driving, and discloses an AMOLED display driving chip integrated system with high refresh rate and low power consumption. The system comprises a pixel flow time sequence analysis module, a dynamic compensation model construction module, a refresh rate adaptive modulation module and a power consumption constraint optimization module. A pixel stream time sequence analysis module captures video source frame cache data in real time, and extracts a pixel brightness distribution matrix and an inter-frame change gradient; a dynamic compensation model building module builds a dynamic voltage compensation network according to the current frame and historical frame information, and fuses the current frame and historical frame information through a space-time attention mechanism; the refresh rate adaptive modulation module generates a decision diagram according to the inter-frame change gradient, and regulates the refresh rate in different regions; and the power consumption constraint optimization module is combined with a chip junction temperature parameter to generate a partition backlight current constraint coefficient matrix. The system can optimize display image quality and fluency, realizes power consumption fine control, guarantees stable operation of a chip, and is suitable for various AMOLED display terminals.

The invention discloses an ambient light adaptive correction system based on feedback control, which comprises a photodiode, a TIA module, a TIA DC compensation module, an analog-to-digital conversion module, a feedback control module and a data register, and is characterized in that the photodiode is used for converting an optical signal into a light current, and the light current is transmitted to the analog-to-digital conversion module after being processed by the TIA module and the TIA DC compensation module; the analog-to-digital conversion module converts the optical current into a digital signal and transmits the digital signal to the feedback control module; the feedback control module is electrically connected with the TIA direct current compensation module and the data register; wherein the feedback control module is used for realizing an ambient light self-adaptive correction method based on feedback control, and the self-adaptive correction method feeds back and adjusts TIA bias current in real time according to light current, ensures the working consistency of the TIA, ensures that the current sampled by the ADC is within a certain range, and calibrates the proportion of the sampled current, so that the current measurement precision of the ADC is improved; and adaptive calibration under chip distance measurement is realized.

The invention relates to the technical field of interferometers, in particular to an interferometer light path calibration method and method.The interferometer light path calibration method comprises the steps that an interferometer is started, a measurement light beam and a reference light beam generated by the interferometer are combined through a polarization splitting prism and then are emitted towards an observation screen, and a measurement light spot and a reference light spot are formed on the observation screen; adjusting a reflector group of the interferometer to enable the measurement light spot to coincide with the reference light spot; the observation screen is removed, an optical fiber is connected, and the combined light beams are coupled into the optical fiber; the output end of the optical fiber is connected to detection equipment, a light current signal is obtained through detection of the detection equipment, and the ratio of an alternating-current voltage component to a direct-current voltage component is shown; and a lambda / 4 wave plate in the interferometer is adjusted until the ratio reaches a preset condition, and calibration is completed. The method is accurate and reliable, is simple and convenient to operate, has repeatability, can give consideration to space alignment and polarization matching, and facilitates the improvement of the stability and measurement precision of an interference system.

The invention discloses a logarithmic pixel signal quantization method and module based on gain dynamic adjustment, and an image sensor. The logarithmic pixel signal quantization method comprises the following steps of: converting light current into logarithmic voltage by logarithmic amplification by using a logarithmic response unit; the voltage type comparator compares the logarithmic voltage with a threshold voltage, outputs a gain regulation and control signal for gain configuration of the programmable gain amplifier and input reference voltage switching, enables the programmable gain amplifier to work in different gain modes, and inputs a flag bit to the N-bit analog-to-digital converter; based on the current gain mode, the programmable gain amplifier amplifies the logarithmic voltage and translates the logarithmic voltage into the quantization range of the N-bit analog-to-digital converter to be output; the N-bit analog-to-digital converter samples an output voltage signal of the programmable gain amplifier, combines the output voltage signal with a flag bit, and outputs an N + 1-bit equivalent digital code value signal. According to the invention, high-sensitivity quantization of low-light-intensity signals and high-precision conversion of high-light-intensity signals are realized at the same time.

An electro-optical integrated circuit comprising an optical transmitter and an optical receiver is disclosed in which a monolithically integrated electro-absorption modulated laser (EML) can operate bi-directionally in both transmitter and receiver modes. Vertically stacked waveguides for lasers and electro-absorption modulators (EAMs) are provided. The laser and the EAM are optically coupled through a transverse conical vertical optical coupler. The EML includes monolithically integrated electronic circuitry, such as drivers and control electronics for driving the laser as the EML and the EAM in the transmitter mode. The control circuit includes a transimpedance amplifier (TIA). The EAM has a first portion and a second portion that may be independently biased. In receiver mode, the laser current is reduced near a threshold, a first portion of the EAM is biased to absorb residual laser light, while a second portion of the EAM provides photocurrent to the TIA as a photodiode receiver.

The invention relates to the technical field of photo-anodes, in particular to a composite photo-anode with transition metal ions embedded into phosphoric acid small organic molecules and a preparation method of the composite photo-anode. The preparation method comprises the following steps: S1, soaking a bismuth vanadate photo-anode in a phosphoric acid small organic molecule solution, and then performing annealing treatment to obtain a phosphoric acid small organic molecule / photo-anode; and S2, soaking the phosphoric acid small organic molecule / photo-anode in a transition metal salt solution to obtain the composite photo-anode. According to the invention, hole storage and transmission functions of polyphosphoric acid small organic molecules and surface rapid water oxidation reaction kinetics of metal ions are synergistically utilized, on one hand, the electron-hole separation efficiency of bismuth vanadate is improved through hole storage, and on the other hand, surface hydroxyl groups of the polyphosphoric acid small organic molecules and transition metal ions are anchored; bismuth vanadate surface electron-hole separation and water oxidation kinetics are synergistically enhanced, charge recombination is synergistically inhibited, charge transfer power is promoted, and the photocurrent density and the water decomposition hydrogen production capacity of the photoanode are improved.

The invention provides a spectrograph, a spectrum reconstruction method and device and electronic equipment, and relates to the field of spectrum analysis. The spectrograph comprises a chip and a peripheral circuit, the chip comprises a photoelectric response layer, a gate layer and an electrode lead-out layer, and a target semiconductor is arranged in the photoelectric response layer; the photoelectric response layer is used for converting an incident spectrum into a photocurrent signal; the gate layer is used for changing the photoelectric response characteristic of the target semiconductor and covers the upper and lower surfaces of the photoelectric response layer; the electrode lead-out layer is used for outputting the photocurrent signal to external equipment, and the external equipment is used for reconstructing an incident spectrum according to the photocurrent signal and the photoelectric response characteristic of the target semiconductor; the peripheral circuit is used for maintaining the chip to work. According to the invention, the semiconductor with adjustable photoelectric response characteristics is used as the core of the photoelectric response layer, so that the spectrometer has the spectral analysis capability from infrared to terahertz wave bands, does not need to depend on a huge optical assembly and a precise mechanical displacement assembly, and can effectively solve the problems in the prior art.

The invention discloses a full-automatic electrochemical luminescence detector based on a photodiode, and relates to an electrochemical luminescence detector, the full-automatic electrochemical luminescence detector comprises a shell, the shell is internally provided with an optical signal acquisition module, a small packaging circuit board, an ECL chip, a man-machine interaction module and a chip inlet and outlet device; a light current detection unit, an electrochemical reaction excitation unit and a microcontroller are arranged in the small packaging circuit board; wherein a test strip sample pad and a reaction area are arranged in the ECL chip. The photodiode used in the invention can make a quick response to the change of light intensity, which is far faster than the frame capturing speed of the camera, and the demand and complexity of subsequent data processing are reduced, so that the system is easier to realize automation. Compared with a camera, the photodiode is lower in hardware cost, does not need to use complex image processing software, and is suitable for household use. The detector is compact in structure, small and exquisite in appearance and convenient to use in a handheld mode and carry about.

The invention discloses a seawater chemical oxygen demand determination method based on bias voltage photoelectric oxidation, and relates to the technical field of water quality monitoring. The method comprises the following steps: collecting seawater and performing pretreatment to obtain a seawater sample; adding supporting electrolyte into the seawater sample to obtain an electrolytic water sample; the method comprises the following steps: injecting an electrolysis water sample into a photoelectrochemical reaction tank, applying bias voltage to a working electrode by taking Ag / AgCl as a reference electrode, and turning on a light source with a specific wavelength for irradiation; carrying out an oxidation reaction in the photoelectrochemical reaction tank, and after the oxidation reaction of the organic matter is complete, obtaining a steady-state photocurrent with a stable current signal; according to a preset steady-state light current-COD concentration curve, a COD measured value is obtained, the COD standard concentration value is corrected according to the water temperature and the salinity, and a COD corrected value is obtained. An adjustable tiny external bias voltage is introduced to cooperate with light source irradiation, so that rapid, accurate and high-anti-interference measurement of COD in seawater is realized.

The invention discloses a 2-micron wave band silicon-based germanium surface incidence type high-speed high-responsivity photoelectric detector, which comprises a p-type doped silicon layer 005, the upper surface of the p-type doped silicon layer 005 is provided with a germanium absorption region 006 and a cathode electrode 011, and the cathode electrode 011 surrounds the germanium absorption region 006; the middle part of the germanium absorption area 006 is provided with a porous resonant cavity array 009, the upper surface of the germanium absorption area 006 is provided with an anode electrode 012, and the anode electrode 012 surrounds the porous resonant cavity array 009. Through direct incidence, a 2-micron optical signal output by an external laser source is input into a germanium absorption region, the optical signal in the germanium absorption region is transversely propagated in the germanium absorption region due to a porous resonant cavity array structure, is finally limited and concentrated in the germanium absorption region, and generates two-photon absorption in the germanium absorption region to generate a free electron hole pair; oriented movement is carried out under external bias voltage loaded through the electrodes, and light current is formed.

The invention relates to the technical field of semiconductor photoelectric device test and diagnosis, in particular to an infrared focal plane process diagnosis method based on machine learning, which comprises the following steps of: firstly, collecting photocurrent spectrum data of a plurality of pixel units on a focal plane array, and extracting a spectrum feature vector after preprocessing; secondly, a machine learning model is trained to obtain a performance prediction model, and key spectral features are obtained through feature importance evaluation; and finally, in combination with semiconductor physical simulation, establishing quantitative correlation between the key spectral characteristics and manufacturing process parameters, and completing diagnosis of production process links. The invention also comprises an optimization method. According to the method, spectral deep form information neglected by a conventional method is deeply mined and quantified, high-precision prediction of the response rate of each pixel of the whole focal plane array is realized by constructing characteristics closely related to a device microscopic physical mechanism, and correlation between spectral characteristics and process structure parameters is established, so that the accuracy of the device is improved. And the performance optimization and the process rapid iteration of the infrared detector chip are guided.

Provided are a vision sensor and an image processing device including the vision sensor. The vision sensor includes a pixel array including a plurality of pixels each including a photoelectric conversion device, which is configured to generate an optical current, a read-out circuit configured to generate intensity image data based on a magnitude of a voltage converted from the optical current, and a data output logic configured to generate event data based on a variation amount in the voltage converted from the optical current.

The invention relates to the technical field of visual sensing modules, and discloses a sensing-storage-calculation integrated bionic visual sensing module in-storage calculation method and system.The method comprises the steps that photo-induced electrons excited by incident photons are directly injected into memristor oxygen vacancy conductive filaments through a shared electrode interface, and photocurrent driving signals are obtained; in a forward SET mode, driving memristor oxygen vacancy conductive filaments to form cross array conductivity distribution, and calculating row line driving voltage of a memristor cross array; applying the current to each cross point of cross array conductance distribution in a reverse RESET mode to obtain a flowing current of each cross point; and converging and summing the flowing current of each cross point at a column line node to obtain a column line output current, performing capacitor charging integration on the column line output current, and converting the column line output current into an analog domain convolution operation voltage, thereby avoiding intermediate multiple analog-to-digital and digital-to-analog conversion loss. And end-to-end low-delay and low-power-consumption processing from photon sensing to feature calculation is realized.

The utility model discloses a pixel unit circuit, a readout circuit and an infrared imaging sensor, and the pixel unit circuit comprises a front-end reading module which is used for converting a light current inputted by an infrared detector array into a light voltage and improving the output swing of the light voltage; the amplification and comparison module is connected with the front-end reading module, and is used for sampling the photovoltage, amplifying a change value of the photovoltage to obtain an amplified photovoltage and comparing the amplified photovoltage with a threshold voltage; and the signal resetting module is connected with the amplification and comparison module and is used for outputting a resetting signal to the amplification and comparison module to trigger the amplification and comparison module to sample the light voltage and outputting an event signal according to a comparison result of the amplified light voltage and the threshold voltage. According to the utility model, the front-end reading module is used for increasing the swing of the output photovoltage, so that the sensitivity of the photovoltage signal to noise and interference in the transmission process is reduced, the anti-interference capability of the signal is enhanced, and the signal-to-noise ratio is improved.

The invention provides an implementation method and system of a flexible fluorescent condenser visible light communication system, and relates to the technical field of data processing, and the method comprises the steps: taking a perovskite thin film as a core light receiving element, and carrying out the processing with a light source driving module, an optical lens group, a photoelectric detector and a signal analysis instrument, so as to generate a light signal receiving device; the method comprises the following steps: setting two fixed detection points on an optical signal receiving device, establishing a reference axis according to the two detection points, performing gridding segmentation on the reference axis, and generating a communication performance adjustment value by adopting a multi-target particle swarm optimization algorithm; and according to the communication performance adjustment value, the light current output by the perovskite thin film is demodulated and analyzed when the optical signal receiving device runs, and the optical communication rate with the field angle larger than + / -30 degrees, the bandwidth of 197.9 MHz and the 432 Mbps is achieved. The photoelectric property stability and the light absorption efficiency of the thin film are improved.

The invention discloses a polarization-dependent bipolar infrared detector based on a corner heterojunction, a preparation method and a photocurrent response polarity regulation and control method. The polarization-dependent bipolar infrared detector comprises a substrate, a corner Van der Waals heterojunction and a transferable metal electrode, wherein the corner Van der Waals heterojunction and the transferable metal electrode are sequentially stacked on the substrate from bottom to top; the corner Van der Waals heterojunction is obtained by sequentially stacking p-type semiconductors, n-type semiconductors and p-type semiconductors to form an npn junction and forming a corner by changing the crystal orientation included angle of the two p-type semiconductors; a built-in electric field is used for driving photon-generated carrier separation, so that the infrared detector works in a photovoltaic mode.