1984results 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.

A pixel circuit includes: a photodiode configured to operate in a photovoltaic mode and to accumulate charges corresponding to an incident light amount; a reset transistor configured to reset the accumulated charges of the photodiode; and a peak hold circuit configured to hold an output corresponding to the accumulated charges of the photodiode, the peak hold circuit including a peak hold transistor connected to an output end of the photodiode, a switching transistor configured to turn on / off an output of the peak hold transistor, and a holding capacitor configured to hold an output of the switching transistor. The peak hold transistor operates in a state where no carrier charge or only one carrier charge is present on a channel.

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 invention relates to the technical field of display screen detection, in particular to a display screen brightness collection method, system and device based on three-color integrating sphere light source correction, and the method comprises the steps: collecting an RGB image of an integrating sphere, and obtaining a flat field correction coefficient matrix; obtaining an actual brightness value of the RGB three-color light source provided by the integrating sphere, and obtaining a brightness calibration coefficient; acquiring an RGB image of the display screen to be detected, obtaining an actual brightness value of each pixel in the display screen to be detected by using the flat field correction coefficient matrix and the brightness calibration coefficient, and obtaining brightness distribution data of sub-pixels of the display screen to be detected according to the actual brightness value of each pixel; and performing brightness compensation on the to-be-detected display screen according to the brightness distribution data, so that the to-be-detected display screen meets the high-quality requirement of production. Through three-color light source correction, the influence of different colors on the acquired brightness data in the brightness acquisition process of the display screen can be effectively eliminated, and the accuracy of brightness extraction of the sub-pixels of the display screen is improved.

The present application provides a photosensitive chip and a distance measurement device, the photosensitive chip includes a SPAD pixel array, a pixel row and column control circuit and a readout circuit; the SPAD pixel array includes a plurality of SPAD pixel units, the SPAD pixel units are used to collect photons to output pulse signals; the pixel row and column control circuit includes a plurality of gating subcircuits, the plurality of gating subcircuits correspond to the plurality of SPAD pixel units one by one, the gating subcircuits include a first enabling unit, a second enabling unit and an output circuit, the output circuit is connected to the first enabling unit and the second enabling unit, and is used to output a response signal to activate the SPAD pixel unit corresponding to the gating subcircuit; the readout circuit is used to receive the response signal to output a histogram, and the histogram is used to record the number of pulse signals. The solution provided by the present application can realize the rapid gating of the SPAD pixel array, which helps to improve the accuracy and stability of distance measurement.

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.

Disclosed herein is a method for determining at least one compensated detector signal for at least one photodetector. The at least one photodetector includes at least one detector element configured for generating at least one detector signal depending on an illumination of the at least one detector element. The method includes the following steps:a) determining at least one dark detector resistance by using the at least one detector element and inhibiting illumination of the at least one detector element;b) generating at least one bright detector signal by using the at least one detector element and allowing illumination of the at least one detector element; anddetermining at least one compensated detector signal for compensating at least one temperature drift of the at least one detector element by using at least one evaluation unit.Also disclosed herein are a method for determining at least one item of measurement information on at least one measurement object by using at least one photodetector, a photodetector and a spectrometer.

The present disclosure relates to a light detection device and an electronic device capable of reducing reflection of incident light depending on an image height position. The light detection device includes a pixel array unit in which a plurality of pixels is arranged in a two-dimensional array. Each pixel includes: a refractive index variation layer having at least two regions in the same layer, the two regions being a first region containing a first matter and a second region containing a second matter; and a photoelectric conversion unit that photoelectrically converts light incident through the refractive index variation layer. An effective refractive index of the refractive index variation layer is configured to differ depending on an image height position of the pixel. The present disclosure can be applied in, for example, a solid-state image capturing device, a light-receiving device of a rangefinding system, or the like.

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.

According to an aspect, a detection device includes: a first detection circuit including a first photodiode sensitive to first light and a second photodiode sensitive to second light; and a second detection circuit including a third photodiode sensitive to third light. The first photodiode and the second photodiode are coupled in series and in opposite directions to form a first detection element. One end side of the first detection element is coupled to a first signal line via a first transistor. Another end side of the first detection element is configured to be supplied with a first drive signal. A cathode of the third photodiode is coupled to a second signal line via a second transistor. An anode of the third photodiode is configured to be supplied with a second drive signal.

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.

An optical sensor includes a wavelength filter configured to transmit light in a specific wavelength range and a magnetic element including a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer. The light passing through the wavelength filter is applied to the magnetic element and the light applied to the magnetic element is detected.

Light detection with reduced noise is disclosed. In one example, a comparator compares a signal with a reference signal and outputs a comparison result. The comparator includes a differential circuit that outputs a differential voltage between the signal and the reference signal, and an active load circuit electrically connected to the differential circuit, in which the active load circuit includes first and second transistors provided on a surface of a substrate, and the first and second transistors have channel regions extending in a direction substantially perpendicular to the surface of the substrate.

An electronic device is presented comprising: at least one basic block, and a control circuit. Each basic block comprises an active unit configured and operable to be responsive to one of circularly polarized electromagnetic field or circularly polarized spin current by a change in magnetization orientation in the active unit. The control circuit is configured and operable to carry out one of the following: (i) monitoring changes in at least one electrical property of the active unit to thereby monitor the change in magnetization orientation in the active unit in response to the circularly polarized electromagnetic field being applied to the active unit, or (ii) managing generation of the circularly polarized spin current in the active unit to thereby induce said change in the magnetization orientation in the active unit.

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.

According to an aspect, a detection device includes: photodiodes provided on a substrate; transistors corresponding to the photodiodes; a first organic insulating film that covers the transistors; first electrodes that are between the first organic insulating film and the photodiodes in a direction orthogonal to the substrate and are provided corresponding to the photodiodes; a second electrode provided so as to extend across the photodiodes; an insulating film between adjacent first electrodes, and a second organic insulating film that covers an inside of a contact hole provided in the first organic insulating film. The photodiodes includes a first carrier transport layer, an active layer, and a second carrier transport layer that are stacked on the substrate. The first carrier transport layer, the active layer, and the second carrier transport layer are provided so as to cover each of the first electrodes, the insulating film, and the second organic insulating film.

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.

A photodetection element according to the present disclosure includes first, second, and third photoelectric conversion units that photoelectrically convert light in first, second, and third wavelength ranges respectively, a color splitter layer, and an antireflection film. The first photoelectric conversion unit is arranged side by side with the second and third photoelectric conversion units. The color splitter layer is on a light incident side of the first, second, and third photoelectric conversion units. The antireflection film is on a light incident side of the color splitter layer. The antireflection film arranged on the light incident side of the first photoelectric conversion unit, the antireflection film arranged on a light incident side of the second photoelectric conversion unit, and the antireflection film arranged on a light incident side of the third photoelectric conversion unit have different respective configurations.

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 apparatus includes a photodiode that performs avalanche multiplication, a recharging circuit, a control signal generating circuit that generates a control signal to control the recharging circuit, a count pulse generating circuit that generates a pulse signal from a signal output from the photodiode, and a counter that counts the pulse signal output from the count pulse generating circuit. The control signal generating circuit is configured to output, based on a clock signal and a mask signal, the control signal having a first period and the control signal having a second period longer than the first period. In a case where a counted value of the counter reaches a threshold, the signal to be output from the control signal generating circuit can be switched from the control signal having the first period to the control signal having the second period.

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.

A decrease in image quality is suppressed. A solid-state imaging apparatus according to an embodiment includes: a photoelectric conversion unit (PD) including a material having a smaller band gap energy than silicon; and a circuit board joined to the photoelectric conversion unit, the circuit board including: a pixel signal generation circuit that generates a pixel signal having a voltage value corresponding to a charge generated in the photoelectric conversion unit; and a thermometer circuit that detects a temperature of the circuit board.