1628 results about "Photocurrent" patented technology

The invention discloses a bionic moving target sensing, storage and calculation integrated photoelectric detection system based on continuous photoconduction, and relates to the field of bionic intelligent vision and the field of brain-like calculation, and the system comprises a synaptic bionic photoelectric detector array and a brain-like memristor array which are interconnected. When the synaptic-like bionic photoelectric detector array detects visual information of a moving target, a fixed bias voltage is applied to a device in each pixel, space illumination information corresponding to each pixel is converted into a continuously attenuated photocurrent signal, illumination information of a multi-frame dynamic target is continuously received in the continuous attenuation process of the photocurrent, and the visual information of the moving target is detected by the synaptic-like bionic photoelectric detector array. After the last frame of illumination information is input, a light current signal of each pixel is read, and a feature map memorizing all historical moment information is determined; the brain-like memristor array is based on the Ohm's law and the Kirchhoff's law, performs deep neural network operation on the feature map, outputs a current corresponding to a task result label, identifies a dynamic target, and can meet the requirements of a deep neural network and a complex dynamic visual task.

The invention belongs to the field of photoelectric detection, and discloses a germanium-silicon photoelectric detector array and a signal reading method thereof, and the germanium-silicon photoelectric detector array comprises a plurality of macro pixel units which are sequentially arranged side by side according to a set interval; each macro pixel unit comprises a plurality of pixel units and an output bus, the pixel units are sequentially arranged from top to bottom according to a set interval, the output end of each pixel unit is electrically connected with the output bus, and the voltage input end of each pixel unit is connected with a bias voltage output module. Providing a bias voltage for each pixel unit to enable each pixel unit to work in a bias state; inputting an optical signal to a detector of each pixel unit to generate a light current, and performing signal conversion and amplification on the light current to obtain an amplified voltage signal; and the voltage signal is output to the output bus after passing through the driver. According to the technical scheme, layout, wiring and hardware resources can be saved, and meanwhile the adverse effect caused by the power supply crosstalk problem is reduced.

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 present invention discloses a CMO / SO / BVO photoanode and a preparation method and application thereof, and relates to the field of photoelectrochemical technology. The method comprises the following steps in sequence: electrodepositing a BiOI film on a substrate material, and then dripping a dimethyl sulfoxide solution containing vanadium acetylacetonate to obtain a BVO electrode; placing in a NaOH solution containing tetraethyl orthosilicate to obtain a SO / BVO electrode; placing in a CoMoO4 precursor solution, hydrothermally reacting, calcining, and obtaining a CMO / SO / BVO photoanode. The CMO / SO / BVO of the present invention exhibits superior photocurrent and charge separation efficiency compared to the CMO / BVO photoanode under 1.23V vs.RHE conditions. The present invention solves the problem of poor photoelectrochemical performance of the photoanode in the prior art.

The invention discloses a preparation method and application of a nickel-cobalt oxide modified molybdenum-doped bismuth vanadate composite photo-anode, and belongs to the application field of hydrogen production through water decomposition in photoelectrochemical reaction engineering. The preparation method comprises the following steps: obtaining a Mo-BiVO4 photo-anode through an electro-deposition and calcination combined method, preparing a precursor solution containing bimetallic nickel and cobalt by using cobalt nitrate hexahydrate, nickel nitrate hexahydrate and boric acid, immersing the Mo-BiVO4 photo-anode into the precursor solution, and growing a nickel-cobalt oxide (NiCoOx) cocatalyst on the surface of Mo-BiVO4 by using a photo-assisted electro-deposition method, thereby obtaining the Mo-BiVO4 photocatalyst. According to the NiCoOx cocatalyst modified Mo-BiVO4 composite photoanode and the preparation method thereof, the photocurrent density of the optimal NiCoOx cocatalyst modified Mo-BiVO4 composite photoanode obtained by the preparation method disclosed by the invention is 5.2 times that of pure bismuth vanadate. The preparation method has the advantages of simple operation method, easily available raw materials, low economic cost and good stability.

The invention discloses a quasi one-dimensional (TaSe4) 2I and two-dimensional MoTe2 mixed-dimensional heterojunction phototransistor detector and a preparation method thereof, the detector sequentially comprises a Si substrate, a SiO2 gate dielectric layer, a quasi one-dimensional (TaSe4) 2I and two-dimensional MoTe2 nano film from bottom to top, the quasi one-dimensional (TaSe4) 2I and MoTe2 nano film are respectively provided with a metal electrode, and a heterostructure of the (TaSe4) 2I, the MoTe2 and the metal electrodes is formed. The preparation method comprises the following steps: (1) transferring the (TaSe4) 2I nanowire to the Si substrate; (2) transferring the MoTe2 nano film to one side of the (TaSe4) 2I nanowire; (3) preparing a pattern of a bottom electrode; (4) positioning, exposing and developing the pattern of the bottom electrode to expose the electrode part needing to be evaporated; and (5) preparing a metal electrode. According to the invention, the composite effect of a (TaSe4) 2I / MoTe2 heterojunction is utilized, and dark current is inhibited through a vertical structure; moTe2 is utilized to increase light absorption, and meanwhile, grid voltage is applied, so that light current is improved, and high responsivity and external quantum efficiency are obtained.

Electro-photonic integrated circuits comprising optical transmitters and receivers are disclosed, wherein a monolithically integrated electro-absorption modulated laser (EML) is operable bidirectionally, in a transmitter mode and in a receiver mode. Vertically stacked waveguides are provided for a laser and an electro-absorption modulator (EAM). The laser and EAM are optically coupled using a laterally tapered vertical optical coupler. The EML comprises monolithically integrated electronic circuitry, e.g., driver and control electronics for the driving the laser and EAM as an EML, in transmitter mode. The control circuitry comprises a transimpedance amplifier (TIA). The EAM has first and second parts that can be independently biased. In receiver mode, the laser current is reduced to close to the threshold, and a first part of the EAM is biased to absorb residual laser light, and the second part of the EAM acts as a photodiode receiver to provide a photocurrent to the TIA.

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.

The invention relates to the technical field of spectrum detection, and particularly provides a passive laser heterodyne double-balance spectrum detection method and device, and the method comprises the steps: carrying out the frequency mixing and differential processing of an input narrow-linewidth laser local oscillator signal and a wide-spectrum incoherent target optical signal through employing an optical mixer and a photodiode, and obtaining a laser heterodyne double-balance spectrum. Two paths of random time beat frequency photocurrent signals with the phase difference of 90 degrees are generated, the random time beat frequency photocurrent signals comprise information such as the spectrum of signal light, and the spectrum information of the signal light can be recovered by processing the output photocurrent signals through methods such as filtering and integration. The narrow linewidth and wavelength tunable characteristics of the narrow linewidth laser local oscillation signal can be utilized to perform high spectral resolution information acquisition on the wide spectrum incoherent optical signal, the utilization efficiency of the local oscillation light is effectively improved, common mode noise and part of system noise are eliminated, and the signal-to-noise ratio of the output signal is enhanced.

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 full-perovskite laminated solar cell design method and system and a solar cell, and relates to the field of solar cells. The method comprises the following steps: establishing a physical simulation model based on actual parameters of a full-perovskite laminated cell to be optimized; constructing a fitness function according to the performance indexes; accessing a meta-heuristic optimization algorithm into the physical simulation model to calculate a fitness function and continuously iterating to obtain an optimal physical parameter under an optimal fitness condition; the optical interference effect of the cell is analyzed based on the optimal physical parameters, and the photoelectric conversion efficiency is improved by adjusting the thickness of a specific layer or introducing a substitute material. Open voltage loss is avoided through the full-plane structure design, specific position antireflection is achieved through the asymmetric multi-film system, and light current is improved. The intelligent algorithm and physical simulation optimization design are combined, the experiment cost is reduced, the traditional concept is broken through, and functional layer thickness optimization is achieved.

The invention provides an image sensor and a manufacturing method thereof, and relates to semiconductor manufacturing. The photoelectric sensing area in the image sensor can be formed by a plurality of doped deposition layers. Therefore, ion implantation does not need to be carried out in the preparation process of the photoelectric sensing area, and damage of ion implantation to the substrate is avoided. In addition, the atomic mass of the doping ions of the bottom doped deposition layer in the multiple doped deposition layers is large, a groove is formed in the bottom doped deposition layer, the atomic mass of the doping ions of the top doped deposition layer is relatively small, and the groove formed in the bottom doped deposition layer is filled with the doping ions of the top doped deposition layer. Therefore, the stability of the photoelectric sensing area can be ensured by arranging the doped ions with relatively high atomic mass at the bottom, and meanwhile, the doped deposition layer can be filled with a large amount of doped ions with relatively low atomic mass through the grooves, so that more free electrons are provided, the light current of the photodiode during light sensing is improved, and the photoelectric sensing efficiency is improved. Therefore, the light sensing capability of the image sensor is improved.

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 discloses a display panel and a display device. The display panel comprises a substrate, a photosensitive element located on one side of the substrate, a first planarization layer located on the side, away from the substrate, of the photosensitive element, and a light-emitting element located on the side, away from the substrate, of the first planarization layer. In the light sensation identification area, the light transmittance of the first planarization layer is larger than or equal to 67%. According to the display panel and the display device provided by the embodiment of the invention, the photosensitive element is arranged in the display panel, and the light transmissivity of the first planarization layer above the photosensitive element is improved by setting the light transmissivity of the first planarization layer in the photosensitive recognition area to be greater than or equal to 67%; therefore, more external light can penetrate through the first planarization layer to irradiate the photosensitive element, so that the number of photons received by the photosensitive element is increased, the light current is improved, and the performance of the photosensitive element can be improved.

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 discloses an optical detector, an optical receiving system, an optical detection method and a chip, and belongs to the field of optical communication. The optical detector comprises a micro-ring detector and N micro-ring resonant cavities which are sequentially arranged and coupled, the first micro-ring resonant cavity is coupled with the waveguide, the micro-ring detector is coupled with the Nth micro-ring resonant cavity, and a first coupling coefficient between the waveguide and the first micro-ring resonant cavity is not smaller than a second coupling coefficient between the micro-ring detector and the Nth micro-ring resonant cavity; and the micro-ring detector is used for generating a first light current based on the target light signal, the first light current is used for detecting the intensity of the target light signal, and the target light signal is obtained by filtering the initial light signal transmitted in the waveguide through the micro-ring detector and the N micro-ring resonant cavities. The optical detector provided by the invention is higher in isolation degree.

The embodiment of the invention particularly relates to a dosage monitoring device based on a scintillation fiber array and a beam control device. In the dose monitoring device, when a beam passes through a two-dimensional scintillation optical fiber array detector, a plurality of first scintillation optical fibers arranged in parallel in a first scintillation optical fiber layer and a plurality of second scintillation optical fibers arranged in parallel in a second scintillation optical fiber layer are excited to emit scintillation fluorescence, and the scintillation fluorescence is transmitted along the optical fibers and received by a photoelectric detection unit; and the photocurrent signal is further converted into a voltage pulse signal by the current-voltage conversion unit, and the output dose information and the radiation field dose distribution information of the electron accelerator can be further obtained according to the voltage pulse signal.

The embodiments relate to the technical field of optoelectronic devices and to a circular polarization-resolved photonic artificial synapse (CPL-resolved PAS) device and a preparation method therefor. The CPL-resolved PAS device includes a heterostructure based on a helical chiral perovskite (H-PVK) and a single-wall carbon nanotube (SWNT). The heterostructure includes a H-PVK layer and a SWNT layer. The H-PVK layer and the SWNT layer contact and overlap, and a heterojunction is formed between the H-PVK layer and the SWNT layer. Using the chiral optoelectronic response characteristics of the H-PVK and the carrier conduction characteristics of the SWNT, the heterostructure is able to achieve nano-ampere-level distinguishable photocurrent response for circular-polarization UV light with different chirality. The CPL-resolved PAS device obtained by the present disclosure has good stability and can be prepared on a large scale.

The invention relates to the technical field of photovoltaics, and provides a photoelectric conversion layer, a preparation method thereof, a photovoltaic device and application. The photoelectric conversion layer comprises at least one Janus MXY two-dimensional material layer, M comprises Mo or W, X comprises S, Se or Te, Y comprises S, Se or Te, and elements of X and Y are different. According to the invention, the vertical polarization characteristic of the Janus MXY two-dimensional material layer is utilized, and an extremely strong spontaneous light current phenomenon is shown, so that the photovoltaic device has ultrahigh light responsiveness and ultrafast light response speed.

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.

An electro-optic modulator may include a radio frequency (RF) modulation region including a first optical waveguide, a second optical waveguide, a first set of electrode segments, a second set of electrode segments, and a conductive strap. The first optical waveguide may propagate a first optical signal. The second optical waveguide may propagate a second optical signal. The first set of electrode segments may apply a first RF signal to the first optical waveguide. The second set of electrode segments may apply a second RF signal to the second optical waveguide. The conductive strap may enable photocurrent generated in the first optical waveguide and the second optical waveguide and flowing through a doped layer below the first optical waveguide and the second optical waveguide to be extracted from the electro-optic modulator. The conductive strap may be ohmically contacted with the doped layer.

The invention provides a preparation method of a TiO2 / Au-C3N4 heterojunction photoelectrochemical biosensor and an application of the TiO2 / Au-C3N4 heterojunction photoelectrochemical biosensor. Comprising the following steps: step 1, preparing TiO2 / FTO; step 2, preparation of TiO2 / Au-C3N4 (titanium dioxide / Au-C3N4); step 3, preparing a nucleic acid aptamer; and step 4, using the confining liquid mercaptohexanol. The preparation method comprises the following steps: firstly, preparing a TiO2 thin film by an electrophoretic deposition method, and then combining the TiO2 thin film with graphite phase carbon nitride (g-C3N4) doped with high-conductivity noble metal gold nanoparticles (Au NPs) to form a heterojunction; under an illumination condition, Au NPs and photons interact to generate a regional surface plasma resonance phenomenon, and a strong electromagnetic field and high-concentration high-energy carriers are formed on the surface of the nano structure in the process, so that the photocurrent response of the composite material is remarkably enhanced; besides, the introduced Au NPs can also form an Au-S bond with the DNA aptamer containing the-SH group, and more binding sites are provided, so that the capture capability of the aptamer is enhanced.

The invention relates to an energy-calculation integrated optical calculation chip element based on a photovoltaic effect and a preparation method and application thereof, and relates to the technical field of optical calculation and photovoltaics. The component comprises a substrate layer, a conductive electrode, a conductive contact piece, a flexural photovoltaic layer and a photoinduced strain layer, light energy entering the flexural photovoltaic layer is converted into electric energy due to the photovoltaic effect, and the photoinduced strain layer in physical contact with the flexural photovoltaic layer is irradiated by a special light beam to generate strain. The strain of the photoinduced strain layer enables the flexural photovoltaic layer in contact with the photoinduced strain layer to generate local strain regulated and controlled by a light beam, and photocurrent generated by the flexural photovoltaic layer due to a photovoltaic effect is subjected to strain regulation and control due to local strain gradient of a material. Compared with the prior art, the element integrates a photovoltaic effect and an optical calculation function, can simultaneously realize conversion from optical energy to electric energy and electric signal output of an optical calculation result through a single element, is a new generation of energy-calculation integrated optical calculation element, and can be used as a core calculation element of a green low-carbon chip.

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 relates to a laser detector suitable for a strong sunlight environment and a preparation method thereof, and belongs to the field of photoelectric detectors. The laser detector comprises a first sub-detector and a second sub-detector which are opposite in polarity, the first sub-detector is used for detecting sunlight and laser signals, the second sub-detector is used for detecting sunlight signals, and the first sub-detector and the second sub-detector eliminate sunlight interference by outputting sunlight current signals which are equal in magnitude and opposite in direction. The detector further comprises a first electrode, a second electrode and a third electrode, the third electrode is connected with the first sub-detector and the second sub-detector, the first electrode is connected with the first sub-detector, and the second electrode is connected with the second sub-detector. And the polarities of voltages connected to the first electrode and the second electrode are opposite. Sunlight currents generated by the two sub-detectors are basically consistent to offset each other, and only small light currents generated by laser signals are output, so that the detector can maintain the optimal working voltage.

The invention discloses an infrared polarized photoelectric detector based on a plasmon metasurface and a preparation method thereof, and belongs to the technical field of photoelectric detection. According to the photoelectric detector, coupling resonance is achieved through the bottom metal nano array and the WSe2 / InSe heterojunction, heterojunction infrared light absorption is enhanced, photocarriers are generated, and finally the photocarriers are collected by the top electrode layer to form photocurrent, so that the infrared light detection capacity of the original WSe2 / InSe heterojunction is improved. And optical absorption enhancement at different infrared wavelengths can be realized by adjusting the period, the length and the width of the metal nano array. When 4V bias voltage is applied, compared with an original WSe2 / InSe heterojunction photoelectric detector, the photoelectric responsivity of the photoelectric detector is improved by one order of magnitude, and the detection rate is improved by two orders of magnitude. In the aspect of polarization detection, the anisotropy of the nano array is utilized, and polarization insensitivity is creatively improved to the polarization ratio of 5.2.