1353results about "Photometry electrical circuits" patented technology

The invention discloses an intelligent service system and method for garden management. The intelligent service system comprises an Internet of Things sensing module, an edge computing module, a cloud service module and an application service module. And comprehensive intelligentization and refinement of garden management are realized. Through file recording, multi-module collaborative operation and deep analysis and intelligent decision of big data, the efficiency and quality of garden maintenance are improved, and the tourist experience and the garden safety management level are also significantly enhanced. The system can monitor the health state of plants in real time, accurately predict and prevent diseases and pests, optimize the irrigation strategy and guarantee the optimal growth conditions of the plants. Meanwhile, through the digital twinborn platform, a manager can deduce different maintenance schemes in a virtual environment, scientifically evaluate a long-term effect and make an optimal decision.

The embodiment of the invention provides an optical detection device which comprises an imaging assembly and a photoelectric detection device, and the imaging assembly is used for forming an image on an image plane of a to-be-detected area of a wafer. And the photoelectric detection device is used for receiving images and is arranged at the image plane. The photoelectric detection device comprises a light beam separation assembly and a sensor assembly, the light beam separation assembly is used for dividing a continuous first light signal in an image into multiple beams of second light signals, and the light beam separation assembly comprises a microlens array. The sensor assembly is used for receiving multiple beams of second optical signals, and each pixel unit of each sensor in the sensor assembly is used for receiving one beam of second optical signal in the multiple beams of second optical signals. The sensor assembly comprises a single-pixel sensor, and the single-pixel sensor corresponds to one micro lens in the micro lens array; and / or, the sensor assembly comprises a multi-pixel sensor, the multi-pixel sensor corresponds to a plurality of microlenses in the microlens array, and spatial segmentation is beneficial to improving the signal-to-noise ratio.

The invention discloses an intelligent laser testing method, which relates to the field of laser testing, and comprises the following steps: judging whether a laser has a fault or not by monitoring the fluctuation amplitude of optical power at the initial stage of starting a to-be-tested laser to emit a light beam; after the laser is not judged to have a fault, the influence of environment heat radiation or aerosol particles on the light beam is positioned by collecting temperature gradient distribution data of a light beam propagation path and combining with air particulate matter concentration data; and obtaining a light beam drift direction, a drift speed and energy uniformity on a light beam propagation path based on the light spot image, determining an abnormal position according to changes of the light beam drift direction, the drift speed and the energy uniformity, and associating the abnormal position with the temperature gradient and the particulate matter concentration in real time. The method effectively distinguishes the fault of the laser from the environmental interference, accurately locates the abnormal position on the beam propagation path, and determines the main environmental interference factors causing the dynamic quality degradation of the beam, thereby providing an accurate basis for the performance evaluation of the laser and the optimization of the application environment.

The various embodiments described herein include methods, devices, and systems for detecting photons. As described herein, superconducting photodetectors may be coupled with a waveguide such that reflection is reduced / minimized. In one aspect, an optical circuit includes an optical waveguide and a plurality of photodetectors coupled to the optical waveguide, adjacent photodetectors of the plurality of photodetectors being spaced to meet one or more preset destructive interference criteria.

The invention provides a signal acquisition system of a photoelectric detector. In the signal acquisition system, a transimpedance pre-amplification circuit is arranged at the output end of the photoelectric detector, and a passive high-pass filter circuit is connected between the transimpedance pre-amplification circuit and a post-voltage amplification circuit. And a feedback network is formed in the transimpedance pre-amplification circuit and is used for converting a current signal output by the photoelectric detector into a proportional first voltage signal and outputting the proportional first voltage signal. The filter circuit is a third-order LC high-pass filter circuit and is used for suppressing direct current, low frequency and self-beat frequency components and keeping a 10-90MHz pass band flat. The rear voltage amplification circuit adopts a voltage amplification structure of a voltage operational amplifier, the voltage gain Av is 6-10, and the super-band gain is limited through a shunt capacitor. According to the embodiment of the invention, through the structure and parameter setting, the noise gain peak value is suppressed, and the system stability is improved.

Disclosed herein is a single photon avalanche diode (SPAD) pixel circuit, including a SPAD having an anode coupled to a negative voltage and a cathode and a cascode transistor having a drain coupled to the cathode of the SPAD, a gate controlled by a cascode control signal, and a source. A readout circuit is coupled to the source of the cascode transistor and configured to detect a voltage change at the source of the cascode transistor and generate a pulse indicating an occurrence of an avalanche event. An active quenching circuit is coupled to the cathode of the SPAD and configured to detect an onset of the avalanche event and pull the cathode of the SPAD to a negative voltage to quench the avalanche event.

The embodiment of the invention provides a photoelectric detection device and an optical detection device. The photoelectric detection device comprises a light beam separation assembly and a sensor assembly. The light beam separating assembly is used for separating the first light signal into a plurality of beams of second light signals. The sensor assembly is used for receiving multiple beams of second optical signals. The sensor assembly includes a plurality of sensors, the plurality of sensors including a multi-pixel sensor. The continuous first optical signal is divided into a plurality of small discrete second optical signals through the light beam separation assembly, so that the light sensing area of each sensor corresponding to a sample is further reduced, the haze noise on a single sensor is further reduced through the small light sensing area, and the haze noise on the single sensor is further reduced under the condition that the original first optical signal is not changed. Noise on a single sensor is reduced, and the signal-to-noise ratio of the photoelectric detection device is improved.

The present disclosure provides systems and methods for monitoring an analyte present in a biological sample of a subject by using: a piercing element coupled to a support, the piercing element configured to pierce a body surface of the subject; an analyte binding probe on or inside the piercing element to provide a change in an optical signal upon contact with an analyte in a biological sample of the subject; and a detector configured to detect the light signal.

An optical compensation device includes a first optical measurer which measures first optical information of a first area of a display device and second optical information of a second area of the display device next to the first area, a target calculator which calculates first target optical information by compensating the second optical information based on an offset lookup table including an offset related to a difference between the first area and the second area, and a gamma determiner which determines a first reference gamma voltage for the first area such that a difference between the first optical information and the first target optical information is within a reference range.

The invention discloses a color cast correction method and device for white picture brightness compensation and a storage medium. The color cast correction method and device are used for performing dual correction on a display screen after Demura compensation is performed on the basis of a white picture. The method comprises the following steps: collecting regional images of a target screen under different exposure times, and calculating to obtain a brightness data mean value of a plurality of regional images; establishing a mapping relation according to the brightness data mean value and the actual brightness data of the regional image; calculating Euclidean distances from the centers of the plurality of regional images to the center of the target screen; constructing a brightness-exposure response function according to the mapping relation and the Euclidean distance to obtain a brightness-exposure characteristic matrix; correcting the brightness data mean value for the first time by using the brightness-exposure characteristic matrix to obtain first corrected brightness data; constructing a chromaticity-brightness correction function of each pixel point in the target screen; and correcting the first corrected brightness data for the second time by using the chroma-brightness correction function to obtain second corrected brightness data.

The utility model provides a gain control device of a silicon photomultiplier, which comprises a temperature sensing module arranged on the surface of the silicon photomultiplier and used for sensing the temperature of the silicon photomultiplier and generating temperature information; one end of the voltage conversion circuit is connected with the first power supply, the other end is connected with the power supply input end of the silicon photomultiplier, and the voltage conversion circuit is used for performing voltage conversion on the first power supply and outputting conversion voltage to the silicon photomultiplier; the processing module is connected with the temperature sensing module and the voltage conversion circuit and used for obtaining the temperature information, generating a voltage control signal based on the temperature information and according to the temperature-voltage mapping relation, sending the voltage control signal to the voltage conversion circuit so as to supply power to the voltage conversion circuit, conducting voltage conversion on the first power source based on the voltage control signal and outputting the converted voltage. And outputting a conversion voltage corresponding to the voltage control signal. The gain control device of the silicon photomultiplier provided by the utility model improves the accuracy of gain control of the silicon photomultiplier.

The invention relates to the field of computational imaging, in particular to a computational imaging method of a crossed strip-shaped anode single-photon detector, which comprises the following steps of: screening effective data through full-view-field illumination, and calculating an average output signal amplitude of each anode strip and a total average output signal amplitude of all anode strips to obtain a correction factor; the method comprises the following steps of: correcting an original output signal of each anode strip by adopting a correction factor during target imaging, performing effective signal data screening on the corrected original output signal, substituting effective signal data into a Gaussian algorithm to calculate an incidence position coordinate, mapping the incidence position coordinate to a mapping matrix, and stretching the incidence position coordinate to a 256 gray level for display. According to the calculation imaging method provided by the invention, the fixed mode noise can be suppressed, the imaging resolution is improved, and the image distortion is reduced.

The embodiment of the invention provides a method and device for detecting the flicker frequency of an ambient light source and electronic equipment, relates to the field of terminals, can detect the flicker frequency of the ambient light source, and is high in detection precision and low in cost. The electronic equipment comprises a light intensity sensing module, an analog-to-digital conversion module and a data processing module, the light intensity sensing module is connected with the analog-to-digital conversion module, and the analog-to-digital conversion module is connected with the data processing module; the light intensity sensing module comprises a photodiode and is used for detecting a light intensity signal of an ambient light source and converting the light intensity signal into an analog voltage signal; the analog-to-digital conversion module is used for converting the analog voltage signal into a digital voltage signal; the analog-to-digital conversion module is an audio chip, and the audio chip is connected with a microphone and / or a loudspeaker; the data processing module is used for calculating the flicker frequency of the ambient light source according to the digital voltage signal.

One example includes a quantum lidar system. The system includes a beam generator configured to generate a signal beam and an idler beam and a beam combiner configured to generate a combined optical beam comprising the signal beam and the idler beam. The system also includes a lidar transmitter configured to transmit the combined optical beam to a target and a lidar receiver configured to receive the combined optical beam and a reflected beam of the combined optical beam reflected from the target to generate lidar data associated with the target.

Technologies are provided to calculate a logarithm of an input current to a logarithmic transimpedance amplifier device at a particular temperature. The logarithm of the current is calculated in digital domain based on sampling of analog signals that are internal to the logarithmic transimpedance amplifier device. The sampling can be performed, in some cases, by an analog-to-digital converter device integrated into the logarithmic transimpedance amplifier device. The calculation in digital domain is performed by one or more processor external to the logarithmic transimpedance amplifier device. The calculation includes a determination of a temperature compensation factor based on an internal analog signal indicative of temperature of the logarithmic transimpedance amplifier device. The temperature compensation factor permits removing temperature dependence from a logarithmic output voltage originating from the input current. Operating in the digital domain permits applying corrections that account for residual leakage current and an emitter-resistance correction at high input currents.

An electromagnetic wave detector includes a heat-absorbing layer, an insulating film, a two-dimensional material layer, and a first electrode portion. The heat-absorbing layer includes a thermoelectric material layer and a phase-transition material layer. The insulating film is disposed on part of the heat-absorbing layer. The two-dimensional material layer is disposed on the heat-absorbing layer and the insulating film and is electrically connected to the heat-absorbing layer. The first electrode portion is disposed on the insulating film and is electrically connected to the heat-absorbing layer with the two-dimensional material layer in between.

The embodiment of the invention provides a photoelectric detection device and an optical detection device. The photoelectric detection device comprises a light beam separation assembly and a sensor assembly. The light beam separation assembly is used for dividing a continuous first light signal into a plurality of beams of second light signals at different spatial positions. The sensor assembly is used for receiving multiple beams of second optical signals. The sensor assembly includes a plurality of sensors, the plurality of sensors including single-pixel sensors. The continuous first optical signal is divided into a plurality of small discrete second optical signals through the light beam separation assembly, so that the light sensing area of each sensor corresponding to a sample is further reduced, the haze noise on a single sensor is further reduced through the small light sensing area, and the haze noise on the single sensor is further reduced under the condition that the original first optical signal is not changed. Noise on a single sensor is reduced, and the signal-to-noise ratio of the photoelectric detection device is improved.

The invention discloses a mixed quenching circuit for realizing gating quenching and rapid active quenching and a working method, and relates to the technical field of weak light detection, the mixed quenching circuit comprises a first high-speed comparator, a second high-speed comparator, a quenching transistor, a high-speed operational amplifier and a balance denoising network, the in-phase input end of the first high-speed comparator is connected with the anode of an APD, and the in-phase input end of the second high-speed comparator is connected with the cathode of the APD; the inverted input end is connected with the adjustable discriminating level and the anode of the APD, and the inverted output end is connected with the latch enabling inverted input end of the APD; the in-phase output end is connected with the input end of the quenching transistor, and the output end of the quenching transistor is connected with the anode of the APD; the output end of the high-speed operational amplifier is connected with the output end of the quenching transistor; the inverting output end and the latch enabling inverting input end of the first high-speed comparator are connected with the inverting input end of the second high-speed comparator; and the in-phase input end of the second high-speed comparator is connected with an adjustable discriminating level. According to the invention, the working modes of gating and free operation can be compatible, and the minimum circuit complexity and dual-mode detection performance are realized.

A method for simulating a photodetector behavior includes: receiving an input waveform for an photodetector; receiving an input optical power and a reverse bias voltage for the photodetector; searching for, in a lookup-table library, model parameters for a photodetector behavior model based on the input optical power and the reverse bias voltage; and outputting a second waveform from the photodetector behavior model, where the second waveform is indicative of an electrical response of the photodetector receiving the input waveform.

The invention relates to the technical field of single-photon detection, in particular to a single-photon detector performance parameter measurement method, device and equipment and a storage medium, and the method comprises the steps: building a statistical histogram of time domain interval data, and building the statistical distribution characteristics of the photon counting rate and dark counting of a single-photon detector; the probability of no photon detection event in the duration of the optical pulse and the ideal probability of no dark pulse in a preset time window are defined based on the statistical distribution characteristics, and then the probability of generating a single photon signal by the periodic optical pulse is calculated based on the obtained parameters; and finally, determining a periodic statistical peak count value based on the statistical histogram and the probability of generating the single photon signal by the periodic light pulse, and calculating an average detection photon number and a dark count rate so as to obtain the dead zone time, so that information such as the average detection photon number, the dark count rate and the dead zone time of the single photon detector is simultaneously represented through one-time data acquisition, and the detection accuracy of the single photon detector is improved. The problems that in a traditional method, the data storage amount is large, and cost is high are solved.

A high-speed, low-noise laser signal detection apparatus, comprising a low-noise linear regulated power supply and a laser detection processing module. The low-noise linear regulated power supply (01-03) comprises an isolation unit (01), a voltage regulation and filtering unit (02), and a reference unit (03). The laser detection processing module (04-09) comprises a laser light signal detection input unit (05), a bias unit (04), a differential amplification unit (07), an active filtering unit (08), and an output interface unit (09). An output end of the voltage regulation and filtering unit (02) is connected to the reference unit (03) and the laser detection processing module (04-09). The reference unit (03) is connected to the bias unit (04) and is configured to provide a reference voltage to the bias unit (04). The bias unit (04) is configured to provide a bias voltage to the differential amplification unit (07). The differential amplification unit (07) comprises a multi-stage in-phase proportional differential amplification circuit, and the active filtering unit (08) comprises a multi-order active low-pass filter. According to the high-speed, low-noise laser signal detection apparatus, the detection bandwidth of a laser signal can be expanded, the signal-to-noise ratio of high-frequency pulse measurement can be reduced, and the anti-interference characteristics of a power supply can be improved.

To provide a superconducting nanowire single-photon detector (SNSPD) device containing a seed layer under a metal nitride layer that deposits δ-phase niobium nitride (NbN) with satisfactory quality.SOLUTION: An SNSPD device 150 includes a substrate 62 having a top surface, an optical waveguide 66 on the top surface of the substrate for receiving light propagating substantially parallel to the top surface of the substrate, a metal nitride seed layer 152 on the optical waveguide, and a superconducting wire 52 on the top surface of the seed layer. The superconducting wire is a different metal nitride (δ-phase NbN) from the metal nitride of the seed layer and is optically coupled to the optical waveguide.SELECTED DRAWING: Figure 9

An avalanche diode arrangement includes a three-dimensional integrated circuit including a stack with at least a top-tier and a bottom-tier. The avalanche diode arrangement also includes a breakdown voltage monitor circuit. The top-tier includes an array of avalanche diodes. The bottom-tier includes an array of integrated light sources, located below the top-tier. In a calibration mode of operation, the light sources are operable to emit light towards the avalanche diodes. The breakdown voltage monitor circuit is operable to adjust bias voltages of the avalanche diodes depending on trigger events induced by light emitted by the light sources during the calibration mode of operation.

An electronic device may include: a display, a light sensor, and at least one processor configured to obtain a first illuminance value based on illuminance data obtained through the light sensor for a first time during which the display is turned on and off, obtain a second illuminance value based on illuminance data obtained through the light sensor for a second time shorter than the first time, while the display is turned on and off, determine a third illuminance value based on the first illuminance value and the second illuminance value, determine a fourth illuminance value based on color information about an image displayed through the display and information related to a luminance of the display, and determine a correction value for correcting an illuminance value obtained through the light sensor based on the third illuminance value and the fourth illuminance value.

The invention provides a single-photon detector gating signal generation system and generation method. The system comprises a bias voltage source; the gating circuit is provided with a first sine branch and a second sine branch, the first sine branch is configured to output a first sine voltage signal, and the second sine branch is configured to output a second sine voltage signal; the frequency of the first sinusoidal voltage signal is greater than that of the second sinusoidal voltage signal; the second sinusoidal voltage signal, the first sinusoidal voltage signal and the bias voltage signal are matched to generate a gating signal acting on the avalanche photodiode; based on the period of the first sinusoidal voltage signal, the gating signal has an amplitude greater than a preset value in a continuous first number of periods, and the gating signal does not have an amplitude greater than the preset value in a subsequent continuous second number of periods. The generated gating signal can accelerate the carrier removal process from the physical mechanism level, the post-pulse probability is suppressed, the required dead time is effectively shortened, and the data rate of the detector is further improved.

The invention provides a light spot detection visualization device and method, and aims to solve the problems of insufficient precision and insufficient interactivity of a traditional fluorescent color developing card in light spot detection. The device is composed of a detection array, a display module and a central controller, the detection array adopts the design of combining a PCB circuit substrate and a colloid quantum dot coating layer, and efficient photoelectric conversion and signal processing are achieved; the central controller analyzes the collected digital signals through an advanced algorithm, so that parameters such as the position and the size of the light spot are accurately calculated, and results are output to the display module to achieve visualization. According to the method, through electrode array partitioning and signal processing flow optimization, the detection efficiency is remarkably improved, and the cost is reduced. The core innovation point of the invention is that a unique hardware structure is combined with an intelligent algorithm, a low-cost and efficient solution is provided for a light spot detection technology, and the technical progress in the field is promoted.

A laser detector includes a delay chain circuit and a warning circuit. The warning circuit is coupled to the delay chain circuit for generating a warning signal. The delay chain circuit includes N inverters coupled in series, an input terminal configured to receive an input voltage to the N inverters, and an output terminal configured to output an output voltage generated by the N inverters. N is a positive integer.

Illuminance distributions on illuminated surfaces within two or more local angular intervals in the far-field of a measured luminaire are measured by a first imaging measurement device and integrated to obtain full spatial light field information of the measured luminaire. Meanwhile, light-emitting surface images of the measured luminaire in two or more poses are obtained by a second imaging measurement device, so as to obtain more accurate pose information of the luminaire when measured by the first imaging measurement device; ray set information of the measured luminaire is calculated from the light-emitting surface images at all angles, and more spatial light field distribution data is further derived. The system includes a rotatable table for installing the measured luminaire, a diffusing screen, the first imaging measurement device, the second imaging measurement device, and a data transmission and reception control unit.

The invention relates to sensor system arrangements and configurations. In particular, the invention provides methods, devices, systems and computer program products for integrating, compositing and / or processing data representing a measurable state within a region-of-interest, that has been received from a plurality of sensors that respectively have different input sensitivities, spectral sensitivity ranges and / or input capture ranges.

Technologies are provided to calculate a logarithm of an input current to a logarithmic transimpedance amplifier device at a particular temperature. The logarithm of the current is calculated in digital domain based on sampling of analog signals that are internal to the logarithmic transimpedance amplifier device. The sampling can be performed, in some cases, by an analog-to-digital converter device integrated into the logarithmic transimpedance amplifier device. The calculation in digital domain is performed by one or more processor external to the logarithmic transimpedance amplifier device. The calculation includes a determination of a temperature compensation factor based on an internal analog signal indicative of temperature of the logarithmic transimpedance amplifier device. The temperature compensation factor permits removing temperature dependence from a logarithmic output voltage originating from the input current. Operating in the digital domain permits applying corrections that account for residual leakage current and an emitter-resistance correction at high input currents.