135results about "Photometry using reference value" patented technology

The invention relates to the technical field of LED display testing, in particular to an LED screen backlight module performance testing system which comprises the steps that a model identification code of a module to be tested is received, a corresponding standard optical parameter set is called, and initial driving current is applied. Actual optical signals driven by different currents are collected through a light sensing probe array and converted into a digital optical measurement value set containing brightness and color coordinate values of multiple sampling points. Comparing the brightness measurement value with a target brightness value point by point to generate a brightness consistency deviation matrix; and judging the color coordinate measurement value and the target range, and generating a color coordinate qualified identifier list. And calculating an actual brightness uniformity value according to the deviation matrix, and comparing the actual brightness uniformity value with a standard threshold value. And if the actual brightness uniformity value reaches the standard and the color coordinates of all the sampling points are qualified, generating a module qualification judgment instruction. According to the system, automatic and high-precision comprehensive evaluation of brightness space uniformity and chromaticity consistency of the backlight module is realized.

An optical system for a dry biochemical analyzer. The system consists of a light-source feedback unit, a light-homogenizing illumination light path and a collection light path. The electric current of a light source can be adjusted by means of the light-source feedback unit, such that the intensity of light output by the light source is stable. The system has a simple structure, high adjustment precision and high stability. By means of a multi-channel light-source current driver provided in the light-source feedback unit, rapid switching control over monochromatic light sources with different wavelengths can be realized. By means of the light-homogenizing illumination light path, light-homogenizing processing is performed on incident light beams, such that uniform illumination can be obtained on a dry reagent strip under test, the light path is concise, and a plurality of monochromatic light sources with different wavelengths that are provided off-axis can be overlapped and focused at the same position. The collection light path is configured as a telecentric light path, and a field diaphragm is provided, such that light beams on an entire illuminated surface can be uniformly collected. By using the system, the accuracy of collected reaction light beams corresponding to an object to be tested can be improved, thereby improving the accuracy of a subsequent analysis result of said object.

The invention refers to a photometric process measurement arrangement (10) with a photometric immersion probe (20). The photometric immersion probe (20) comprises a photometer flashlight source (61) for providing photometric light impulses, a photometric detector arrangement (70) comprising at least two separate wavelength-selective detection elements (71, 72, 73), and a photometer control (80) controlling the photometer flashlight source (61) and the detector arrangement (70). The photometer control (80) comprises several impulse signal integrators (819, 829, 839) for integrating the electric impulses generated by the detection elements (71, 72, 73), several A / D-converters (81, 82, 83) for converting the voltages of the impulse signal integrators (819, 829, 839) when high-precision-converting trigger ports (H) of the A / D-converters (81, 82, 83) are triggered, and a measuring cycle control (90) with an integration target memory (94) memorizing an integration target voltage value (Ut). The photometer control (80) is provided with a high-precision-request port (93) for synchronously triggering the high-precision-converting trigger ports (H) of all A / D-converters (81, 82, 83) after the voltage of the first of all impulse signal integrators (819, 829, 839) has exceeded the memorized integration target voltage value (Ut).

A method and system are provided for rapidly determining equi-depth histogram (ED histogram) boundaries for single photon arrival times without storing complete photon timestamp histories. A plurality of control values (CVs) is initialized for a plurality of binners that classify photon events as early or late relative to the respective CVs. Upon detecting photon arrivals, early and late arrival counts are used to update the CVs using an improved stepping strategy. The disclosed stepping strategy includes scaling a base step size, smoothing with exponential smoothing, temporally decaying the smoothed step size, and further smoothing to produce the step size for updating the CV. The disclosed stepping approach enables the CVs to rapidly converge to the desired quantile locations with low bias and variance compared to previous methods. The optimized stepping strategy is robust to noise and background light, providing accurate distance estimates while reducing bandwidth requirements.

Aspects of the present invention relate to methods and systems for measuring and managing the brightness of digital content in a field of view of a head-worn computer.

To provide a technique capable of estimating a camera position without having high processing performance.SOLUTION: An optical wireless communication system includes a plurality of light sources, a receiving device including an event camera, and an information processing device. Each of the plurality of light sources transmits an optical wireless communication signal. The receiving device receives the optical wireless communication signal via the event camera. The optical wireless communication signal includes position-related information for identifying a position in an absolute coordinate system of a transmission source of the optical wireless communication signal. The information processing device identifies a signal region of the optical wireless communication signal in an image plane coordinate system of an image plane obtained by the event camera to acquire a light source image position indicating a position at which each of the plurality of light sources is projected in the image plane coordinate system, acquires a light source absolute position indicating a position at which each of the plurality of light sources is located in the absolute coordinate system on the basis of the position-related information included in the optical wireless communication signal, and uses the light source image position and the light source absolute position to estimate a position and a direction of the event camera in the absolute coordinate system.SELECTED DRAWING: Figure 1

The application discloses an AOI equipment light intensity curve generation method, system and device and a storage medium, relates to the technical field of light intensity curve generation, and comprises the following steps: in the optical scene of the randomly selected wavelength filter, the optical attenuating sheet placed in the first gear and the second gear and the illumination light source output power increased in the first preset step, the first reference curve and the second reference curve are determined based on the light power value under different illumination light source output powers; the target reference curve is determined according to the first reference curve and the second reference curve; in the optical scene of the reference wafer, the optical attenuating sheet placed in the first gear or the second gear and the illumination light source output power increased in the second preset step under different preset target objectives and the corresponding target wavelength filter, the light intensity curve vertex value is determined based on the reference wafer image gray value, the target reference curve and the preset coefficient; and the target light intensity curve is determined according to the light intensity curve vertex value and the target reference curve. The application can efficiently generate the light intensity curve with strong universality.

To provide an optical control device that can change an irradiation direction of light with which an object is irradiated without changing the position of an optical system.SOLUTION: An optical control device comprises: a light source; a light condensing unit; and an optical route control unit. The light source emits light. The light condensing unit condenses the light the light source emits to irradiate an object with the condensed light. The optical route control unit is arranged between the light source and the light condensing unit, and changes an irradiation direction of the light relative to the object by changing the position of a portion where the light passes in a plane vertical to an optical axis of the light.SELECTED DRAWING: Figure 1

Provided are an optical measurement device, an optical measurement method, a data processing device, and a program, capable of generating data that is a stimulus value that takes into account the time response of an eye and suppresses waveform distortion, capable of performing good flicker measurement, and also capable of coping with a measurement target object having a non-periodic light emission waveform. A stimulus value acquisition unit (20) receives light from a measurement target object to continuously acquire intensities corresponding to stimulus values at constant time intervals; a response characteristic acquisition unit (32) acquires a pulse response characteristic from a storage unit (31) that stores a pulse response characteristic corresponding to a visual stimulus response; and a digital filter processing unit (32) performs digital filter processing on continuous data of the acquired stimulus value intensities using the acquired pulse response characteristic to generate data on which a visual stimulus response is superimposed.

A light detection element include: a magnetic element, a capacitor, and a resistor, wherein the magnetic element and the capacitor are connected in series, the resistor is connected to the magnetic element and the capacitor in parallel, the magnetic element includes a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer, and the magnetic element is configured to be irradiated with a light containing an optical signal with a change of intensity of the light.

The invention discloses a lamplight verification method and equipment. The method at least comprises the following steps: determining a model and a first deployment mode of a to-be-tested lamp; determining a target illumination curve of the to-be-detected lamp based on the model and the first deployment mode; the target illumination curve is used for representing illumination values of the lamp to be detected at different positions; and verifying whether the illuminance of the to-be-detected lamp meets a demand condition based on the target illuminance curve. According to the scheme, the checking efficiency of the light illumination is improved, and the checking cost is reduced.

The invention provides a photoelectric detector responsivity testing device, a photoelectric detector responsivity testing method and a wafer. The responsivity of a to-be-tested photoelectric detector can be accurately and rapidly tested with low testing cost. In the responsivity testing device, a first reference photoelectric detector and a to-be-tested photoelectric detector are respectively connected to different output ends of a 1 * N optical splitter, and a light current testing module respectively tests light currents of the first reference photoelectric detector and the to-be-tested photoelectric detector and outputs the light currents to a responsivity calculation module. The responsivity calculation module calculates the responsivity of the to-be-detected photoelectric detector based on the reference responsivity of the first reference photoelectric detector, the corresponding light splitting proportions of different output ends of the 1 * N light splitter, and the ratio of the photocurrent of the to-be-detected photoelectric detector to the photocurrent of the first reference photoelectric detector.

A multispectral sensor device may include a sensor array comprising a plurality of channels and one or more processors to determine that a time-sensitive measurement is to be performed, wherein the time-sensitive measurement is to be performed using data collected by one or more channels of the plurality of channels; cause the data to be collected by a proper subset of channels, of the plurality of channels, wherein the proper subset of channels includes the one or more channels; and determine the time-sensitive measurement based on the data.

Aspects of the present disclosure include methods for determining parameters of a photodetector (e.g., a photodetector in a particle analyzer). Methods according to certain embodiments include illuminating a photodetector positioned in a particle analyzer with a light source (e.g., a continuous wave light source) at a first intensity for a first predetermined time interval, illuminating the photodetector with the light source at a second intensity for a second predetermined time interval, integrating a data signal from the photodetector over a time period including the first and second predetermined time intervals, and determining one or more parameters of the photodetector based on the integrated data signal. The present disclosure also describes systems (e.g., particle analyzers) having a light source and a photodetector for implementing the subject methods. The present disclosure also provides non-transitory computer readable storage media having stored thereon instructions for determining parameters of a photodetector according to the subject methods.

The invention relates to the technical field of semiconductors, and discloses a double-gate two-dimensional transistor for multifunctional storage and logic calculation, which comprises a substrate, a floating gate layer, a tunneling layer, a channel layer, a top gate insulating layer, a bottom gate electrode, a top gate electrode, a source electrode and a drain electrode, the substrate is an N-type single-polished silicon oxide wafer, the floating gate layer is a graphene layer, the tunneling layer is a hexagonal boron nitride layer, the channel layer is a molybdenum disulfide layer, and the top gate insulating layer is a hexagonal boron nitride layer; the floating gate layer is arranged on the upper surface of the substrate, the tunneling layer covers the upper surface of the floating gate layer, the channel layer is arranged on the upper surface of the tunneling layer, and the top gate insulating layer covers the upper surface of the channel layer. By means of a heterogeneous stack structure of h-BN / MoS graphene and a double-gate independent regulation and control mechanism, single device integration of light perception, nonvolatile storage and logic operation is achieved, additional splicing links of sensing, storage and calculation units in a traditional system are omitted, and a hardware architecture is greatly simplified.

The invention discloses a Mini-LED backlight display halo perception boundary determination method and system, and aims to solve the problem that a halo boundary in a high dynamic contrast display scene is difficult to objectively define. The method comprises the following steps: acquiring brightness distribution of a display area and a surrounding dark area in a dark environment; guiding an observer to determine a subjective halo boundary position under a standard observation condition; mapping the position to objective brightness data to extract a boundary brightness threshold value; and establishing a sensing boundary model based on multiple groups of peak brightness and boundary thresholds, wherein the sensing boundary model is used for stably determining a halation region which can be sensed by human eyes under different brightness, partition and dimming strategies. According to the method, the perception boundary is used for replacing a fixed absolute threshold value, evaluation consistency is remarkably improved, closed-loop association of subjective perception and objective data is achieved, and reproducible and computable standardized criteria are provided for halo evaluation, algorithm optimization and production line quality control.

A method for determining natural illumination duration and an electronic device are provided, to more accurately determine a scenario in which a user is located and effectively determine natural illumination duration, to help the user improve vision. The method is applied to an electronic device having a display screen and includes: determining a current scenario based on a preset reference factor (S901), where the preset reference factor includes any one or more of ultraviolet intensity, illumination intensity, and locating signal strength; and counting current natural illumination duration towards cumulative natural illumination duration if the current scenario is a preset scenario (S902), where the preset scenario includes any one or more of an outdoor scenario, an indoor near-window scenario, and an outdoor blocked scenario.

Smoke detector (2) according to the scattering radiation principle, with a radiation transmitter (4) and a radiation receiver (6), whose radiation paths (8, 10) form a scattering volume (12), and with a filter medium for filtering out ambient light, characterized in that the smoke detector (2) is designed so that the filter medium can be temporarily deactivated, wherein the filter medium has an optical filter (14, 18) for filtering radiation reaching the radiation receiver (6).

A system including a first laser source configured to generate a first laser beam in a pulsed form, and a second laser source configured to generate a second laser beam. The system further includes an optical fiber configured to: receive the first laser beam, output the first laser beam from a distal end of the optical fiber; receive the second laser beam, output the second laser beam from a distal end of the optical fiber, receive a reflected portion of the second laser beam that is reflected back into the distal end of the optical fiber, and direct the reflected portion of the second laser beam to the optical detector. The optical detector is configured to receive the reflected portion of the second laser beam from the optical fiber and generate an optical detector output based on the reflected portion of the second laser beam.

A method for calibrating an optical sensor and / or camera for a motor vehicle, wherein the optical sensor and / or camera detects ambient light through a first disk (10) for the motor vehicle, the method comprising the following steps: receiving a first attenuation value of a first reference light beam reflected in a second disk (50) for a motor vehicle; receiving a second attenuation value of a second reference light beam passing through the second disk (50); sending a measuring light beam from a first side (12) of the first disk (10) into the first disk (10); receiving the measuring light beam reflected in the first disk (10) on the first side (12) of the first disk (10); determining a third attenuation value of the measuring light beam in the first disk (10) based on the sent measuring light beam and the received measuring light beam;and calibrating the optical sensor and / or camera based on the first attenuation value of the second disk (50), the second attenuation value of the second disk (50) and the third attenuation value of the first disk (10).;

The invention relates to a device (10) for determining the power of a laser beam (14). The power of a first partial beam (18a) of the laser beam (14) is determined by a first partial power meter (12a), the laser beam (14) being split into the first partial beam (18a) and the main beam (20). The device (10) has a calorimetric power meter (22) having a beam well (36) for absorbing a main beam (20) of the laser beam (14), the calorimetric power meter (22) being arranged downstream of the first partial power meter (12a) in the beam direction of the laser beam (14). A cooling medium (42) of the cooling system (40) is used to absorb thermal energy of the calorimetric power meter (22), which thermal energy is generated as a result of the main beam (20) being incident on the calorimetric power meter (22). In order to determine the temperature difference between the cooling medium (42) and the calorimetric power meter (22) before and after the thermal energy exchange, the calorimetric power meter (22) has a temperature measuring system (58). A control device (62) of the device (10) is designed to calorimetrically determine the power of the main beam (20) from a measured value of the cooling medium (42) during the cooling process.

To provide sensors configured to exhibit improved performance without increasing the size or number of sensors, and electronic devices including the sensors.SOLUTION: A sensor comprises: a visible light sensor 100 configured to sense light in the visible light region; a near-infrared light sensor 200 stacked on the visible light sensor and configured to sense a part of light within the near-infrared region; and an optical filter 300 arranged atop the near-infrared light sensor, the optical filter configured to selectively transmit the light in the visible light region and the part of light within the near-infrared region.SELECTED DRAWING: Figure 2

Test apparatus and method for testing a printed circuit board assembly (PCBA) of a diagnostic device are disclosed. The apparatus controls a light source of the PCBA of the diagnostic device to operate at a first current level. The apparatus measures a first collector current of a first photo sensor of the PCBA of the diagnostic device. The apparatus measures a first collector current of a second photo sensor of the PCBA of the diagnostic device. The apparatus controls the light source of the PCBA of the diagnostic device to operate at a second current level. The apparatus measures a second collector current of the first photo sensor of the PCBA of the diagnostic device. The apparatus measures a second collector current of the second photo sensor of the PCBA of the diagnostic device. The apparatus determines an error value based on the measured collector currents.

A calibration tool (300) for a beam profiler (100) is disclosed. The calibration tool (300) includes an integrating sphere (308) configured to receive laser light (306) emitted from a laser (314) and generate diffuse laser light (316). A sensor system (318) is configured to output an expected intensity value (326) of the diffuse laser light (316). An interface (336) is configured to align the beam profiler (100) with the integrating sphere (308) to direct the diffuse laser light (316) to be incident on an array of pixels (106) of a beam sensor (102) of the beam profiler (100). The array of pixels (106) of the beam sensor (102) is configured to output a plurality of native intensity values (338) of the diffuse laser light (316). A computing system (340) is configured to calibrate the beam profiler (100) based at least on differences between the plurality of native intensity values (338) of the diffuse laser light (316) and the expected intensity value (326) of the diffuse laser light (316).

The invention discloses a water body scattering in-situ measurement method and device based on multidirectional data synchronization, and the method comprises the steps: obtaining corresponding signals of a reference channel and a plurality of collection channels through a data collection module, and enabling the plurality of collection channels to respectively correspond to water body measurement regions in different directions around an underwater robot; collected signals are sent to a processing unit after being subjected to automatic gain control and high-speed analog-to-digital conversion, the back scattering intensity of water body particles at different distances and in different directions is obtained, the back scattering intensity is synchronized with time, position and depth information of an underwater robot, and all-directional full-time monitoring of the water body scattering characteristics is achieved. Meanwhile, on the basis of a homologous sampling clock and unified triggering, an initial delay reference of each acquisition channel relative to a reference channel is obtained through a common calibration pulse, and the initial delay reference is processed based on a time alignment method of a narrowband pilot signal; therefore, sub-sampling-level time synchronization of multi-channel sampling data is realized under a long-term operation condition.

The application discloses a kind of illumination calibration method, device, system and nonvolatile storage medium.Therein, the method comprises: the first light intensity of the preset light source on the standard surface is collected, and the second light intensity of the preset light source on the target surface;According to the first light intensity and the second light intensity, the compensation mode corresponding to the target surface is determined;The original light intensity of the target light source to be detected on the target surface is obtained;Based on the original light intensity and the compensation mode, the target light intensity corresponding to the target light source is determined.The application solves the technical problem that the material and color of light reflection surface can affect the collected light intensity data, resulting in that the obtained light intensity data is not accurate enough.

A method for calibrating a detector device under test includes emitting laser pulses by a first set of laser sources of laser sources in a first time slot and laser pulses by a second set of laser sources of the laser sources in a second time slot different from the first time slot. The first laser pulses and the second laser pulses combine for a first combined laser pulse in the first time slot and a second combined laser pulse in the second time slot. The first and second combined laser pulses are detected by a detector for corresponding first and second electric signals. The laser sources are regrouped into different first and second sets of laser sources through all permutations of the laser sources by keeping the predetermined pulse ratio n / m. Averaged first and second electric signals indicate the response of the device for the predetermined pulse ratio n / m.

This invention discloses a resonant balanced zero-beat photodetector with notch characteristics, its printing apparatus, and a testing apparatus, belonging to the field of photodetectors. By introducing an LC series resonant notch circuit into the resonant balanced zero-beat detector, and adjusting the fine-tuning capacitor in the LC series resonant notch circuit, noise at the repetition frequency of the pulsed light can be suppressed, ensuring optimal notch performance and improving the saturation power and signal-to-noise ratio of the photodetector under pulsed light. It can be applied to testing apparatuses for pulsed compressed light.