149 results about "Large dynamic range" patented technology

An optical frequency domain reflectometer with environmental disturbance resistance and large strain measurement capability belongs to the field of distributed optical fiber sensing and comprises an opposite sweep frequency light frequency modulation continuous wave signal generation module, a light splitting device, a modulation device, a circulator, a polarization controller, an optical coupling device, a photoelectric conversion module and a data acquisition and processing module. An optical signal generated by an opposite sweep frequency light frequency modulation continuous wave signal generation module is divided into probe light and local oscillation light through a light splitting device, the probe light is modulated through a modulation device and sent to an optical fiber through a circulator, and a Rayleigh back scattering light signal generated by the optical fiber and the local oscillation light interfere in an optical coupling device to obtain interference light; the photoelectric conversion module mixes beat frequency signals of interference light, and the data acquisition and processing module analyzes and processes the beat frequency signals. According to the invention, the position information of the Rayleigh backscattering point is marked by using the modulated probe light, the Rayleigh scattering signal at the corresponding position is restored, crosstalk between channels is inhibited, and high-precision measurement in a large dynamic range and resistant to environmental disturbance is realized.

The present application discloses a low-cost and high-performance radio-frequency amplifier, comprising an input stage circuit, a common-gate stage circuit, and an output load circuit. The input stage circuit implements conversion from a single-ended signal to a differential signal, implements input impedance matching, and converts an inputted radio-frequency voltage signal into a radio-frequency current signal. The input stage circuit comprises a first three-coil transformer, consisting of a primary coil, a secondary coil, and a third coil. The common-gate stage circuit transmits the radio-frequency current signal outputted by the input stage circuit to the output load circuit, increases the withstand voltage and equivalent output impedance of the circuit, and implements gain control in at least two modes. The output load circuit converts the radio-frequency current signal from the common-gate stage circuit into a radio-frequency voltage signal, implements conversion from a differential signal to a single-ended signal, and outputs an amplified radio-frequency voltage signal. The present application provides a radio-frequency amplifier having a small size, broadband matching, high linearity, a large dynamic range, and low design complexity.

The invention discloses a large dynamic range Hartmann sensor out-of-focus measurement method and device, and belongs to the technical field of wavefront detection, and the method calculates the out-of-focus amount by measuring the change of the distance from a sub-light spot to the center of a light spot array, thereby achieving the out-of-focus measurement of an ultra-large dynamic range. According to the method, under the condition that the defocusing amount is too large and the sub-light spots cross the sub-apertures, the defocusing amount is estimated by measuring the distance variation of the sub-light spots to the center of the light spot array. According to the method, the defocusing amount is calculated by analyzing the position change of the sub light spots and calculating the distance difference between the sub light spots and the center of the target surface, so that the limitation of the traditional Hartmann measurement method on the dynamic range is overcome. According to the method, the light spot distance is used as a measurement basis, and the out-of-focus range capable of being detected by the Hartmann sensor is remarkably expanded. The estimation mode based on the light spot distance is suitable for the situation that sub-light spots cross sub-apertures, and an efficient and reliable defocus measurement scheme is provided for a large optical system.

The invention belongs to the field of acceleration measurement, and particularly discloses a multi-acceleration-sensor data fusion method and system, and the method comprises the steps: obtaining acceleration signals measured by each accelerometer when a preset acceleration signal is inputted into calibration equipment when an accelerometer assembly composed of N accelerometers is disposed on the calibration equipment, the measuring ranges of the N accelerometers are complementary to the noise level range; considering the inclination angle error of the rotary table, the installation angle error of each accelerometer and the non-orthogonal error of each accelerometer, the coordinate system of each accelerometer is converted to the same geographic coordinate system, and each accelerometer is calibrated by combining the acceleration signal measured by each accelerometer and the input preset acceleration signal. Obtaining calibration parameters of each accelerometer; the calibration parameters are used for compensating acceleration signals measured by the accelerometers. According to the invention, large-dynamic-range acceleration measurement is realized.

This invention discloses a sub-aperture stitching interferometric measurement device and method for optical freeform surfaces. The device includes a laser interferometer, a variable phase compensator, and a multi-axis motion stage for motion control of the mirror under test. The variable phase compensator consists of two freeform surface mirrors and two wedges, used to achieve phase compensation with a large dynamic range for each sub-aperture. The system automatically adjusts the compensation phase of the sub-apertures using a weighted stochastic gradient descent algorithm and performs in-situ measurement of the compensation phase using a micro-translation misalignment measurement method. The system can realize three measurement modes: full aperture coverage stitching measurement, sub-aperture coverage stitching measurement, and comprehensive measurement. This invention enables high-precision measurement of flexible, complex optical freeform surfaces (such as gull-wing surfaces).

This invention discloses an on-board calibration device, relating to the field of on-board calibration technology, comprising: a calibration source and a calibration lens; the calibration source includes a blackbody radiating surface, a temperature measuring unit, a support structure, conductive components, and a housing; wherein, the blackbody radiating surface is fabricated using MEMS technology and includes a metal heating layer and a specific coating for generating infrared radiation; the conductive components are used to power the blackbody radiating surface; the support structure is used to fix and support the blackbody radiating surface; the temperature measuring unit is used to monitor the temperature of the blackbody radiating surface; the housing is used to encapsulate the calibration source; the calibration lens is disposed in the light output path of the calibration source and is used to collect and compress the infrared radiation light emitted by the calibration source before introducing it into the lens of a remote sensing camera. This invention uses MEMS technology to fabricate the calibration source, which has excellent performance characteristics such as high emissivity, fast response, large dynamic range, and high temperature measurement accuracy, and is small in size and light in weight.

This disclosure relates to a large dynamic range radiation detector and method that simultaneously achieves particle counting and energy integration. The radiation detector includes one or more detection channels, each channel comprising: a sensor, an analog front-end circuit, an analog-to-digital converter, a digital counting module, and a charge integration module. The sensor converts incident radiation into a current signal, the radiation including rays or particles. The analog front-end circuit amplifies the current signal and converts it into a voltage signal. The analog-to-digital converter converts the voltage signal into a digital waveform, the digital waveform including discretized voltage sample values. The digital counting module determines the pulse count information of the radiation based on the digital waveform. The charge integration module determines the charge integration information of the radiation based on the digital waveform. Therefore, both particle counting and energy integration detection methods can be implemented in the digital domain, effectively improving the performance of the radiation detector in terms of noise, energy resolution, and dynamic range.

The invention relates to the technical field of differential absorption spectrum inversion, and discloses an ozone precursor monitoring method and system based on a two-channel differential absorption spectrum and nonlinear inversion, a terminal and a storage medium, the method comprises the following steps: synchronously obtaining a target spectrum and a reference spectrum of a target area to calculate a multiband atmospheric differential optical thickness; building a combination model based on the difference optical thickness of each wave band, dividing a fitting window, and obtaining the difference inclined column concentration through multi-angle fitting; and inverting a vertical concentration distribution profile of the ozone precursor by using different sensitivities in combination with a radiation transmission model and a logarithmic space iterative inversion algorithm. According to the invention, through a high-performance dual-channel spectrometer observation system and a high-precision nonlinear inversion algorithm, high-spectral-resolution measurement of ultraviolet-visible light full wavebands is realized, logarithmic space processing is introduced in inversion, the inherent problems of strong nonlinearity and large dynamic range of a vertical profile of aerosol and trace gas are effectively solved, and the measurement accuracy is improved. And the measurement precision and stability are improved.

This application provides an early warning method for the supply of power materials in temporary construction warehouses, comprising: establishing a three-dimensional electromagnetic field distribution model based on the relative positional relationship between temporary construction warehouses and high-voltage transmission lines on highways, and obtaining the theoretical distribution of the electromagnetic environment of each warehouse; within the temporary warehouses, deploying electromagnetic sensors for materials whose electronic components are highly sensitive to electromagnetic interference, and deploying large dynamic range electromagnetic sensors for materials whose metallic materials are susceptible to strong electromagnetic fields; transmitting the monitoring data collected by various electromagnetic sensors in the warehouses back to the power grid dispatch center in real time through a low-power wide-area Internet of Things, and correlating it with the structural parameters of the warehouse materials to construct a database; mining historical data on power grid load and electromagnetic environment, extracting the correlation between electromagnetic interference characteristics and the operating conditions of transmission lines, and establishing a collaborative prediction model of the electromagnetic safety status of multiple warehouses.

The present application relates to a kind of Hartmann wavefront measurement dynamic range extension method based on quadratic phase control, belong to wavefront measurement technical field.For the problem that the measurable slope interval is limited in the limited detection displacement range in traditional Hartmann wavefront measurement, at least the sub-aperture phase distribution containing reference focusing phase and quadratic phase term is constructed in super surface phase control, and the displacement of each sub-aperture corresponding light spot on the detection surface and the local average slope of the sub-aperture satisfy the preset monotone reversible nonlinear mapping relationship in design working interval by combining theoretical modeling, numerical optimization and / or experimental calibration.The present application can reconstruct the slope-displacement encoding rule of traditional Hartmann under the premise of keeping local average slope reversible and wavefront reconstructable, extend the encodable slope range in given displacement range, so as to improve the dynamic range of Hartmann wavefront measurement, especially suitable for the measurement scene of strong non-uniform, large dynamic range wavefront.

The application discloses a single-end distributed optical fiber vibration sensor system and a signal processing method, and relates to the technical field of optical fiber vibration sensors. The system comprises a laser source, an electro-optical modulator, a to-be-measured optical fiber, a piezoelectric ceramic, a 1*2 coupler, a frequency mixer, an oscilloscope and a PC end. The laser source transmits laser to the to-be-measured optical fiber after the laser is loaded with a carrier frequency by the electro-optical modulator. The to-be-measured optical fiber changes the phase of the light conducted in the optical fiber after being affected by external environmental vibration. The piezoelectric ceramic generates a vibration signal to modulate the phase information of the to-be-measured optical fiber, and then transmits the vibration signal to the 1*2 coupler. The 1*2 coupler divides the vibration signal into signal light and local oscillator light, and then transmits the signal light and the local oscillator light to the frequency mixer for coherent mixing. The frequency mixer demodulates the phase change. The PC end demodulates and processes the phase change collected by the oscilloscope to obtain vibration information of the external environment. The single-end distributed optical fiber vibration sensor system has a large dynamic range, a long measurement distance, low cost and measurement stability.

A large language model quantization method based on channel arrangement and activation adaptive smoothing belongs to the technical field of large language model compression and efficient inference. In order to solve the problem that the existing post-training quantization method is difficult to simultaneously consider the difference of different channel activation outliers, the group mode quantization has large dynamic range in the group, and the low bit weight and high bit activation alignment efficiency is low, which leads to the problem of precision decline and inference efficiency limitation, the scheme calibrates the maximum activation amplitude of the input channel by statistical data, divides the significant and non significant activation outlier channels according to the percentile threshold, and respectively uses the logarithmic domain and power function domain smoothing strategy to generate channel smoothing scaling factor, and fuses it into the model parameter to extract the weight multidimensional feature to construct the channel quantization sensitivity index and execute the input channel rearrangement, and further generate the joint quantization scaling factor to realize the integer domain alignment inference. It is suitable for low bit compression deployment and efficient inference scene of large language model in resource limited environment.

The invention relates to the technical field of optical fiber communication, and discloses an optical fiber fault positioning device and method based on electric chaos and coherent detection.In the device, a narrow linewidth laser is used for generating continuous light, and a beam splitter is used for splitting the continuous light into continuous light carriers and local reference light; the electric chaotic signal generation module is used for outputting broadband chaotic electric signals; the optical modulation module is used for modulating a continuous optical carrier according to the broadband chaotic electric signal and outputting chaotic detection light; the optical coherent detection module is used for performing coherent frequency mixing on the echo signal and local reference light from the beam splitter and outputting a differential electric signal; and the signal processing module is used for performing cross-correlation operation on the broadband chaotic electric signal and the differential electric signal, and determining fault information in the optical fiber link based on a cross-correlation result. According to the invention, through fusion of electric chaos and coherent detection, a scheme with high resolution, large dynamic range, high stability and good integration potential is realized.

A photoelectric conversion substrate and a flat panel detection apparatus. The photoelectric conversion substrate comprises a first region, and the photoelectric conversion substrate further comprises a substrate and at least one pixel unit, which is located on one side of the substrate and located in the first region, wherein the pixel unit comprises a photoelectric conversion element, which is located on one side of the substrate; the photoelectric conversion element comprises a first electrode, a photoelectric conversion layer and a second electrode, and the first electrode, the photoelectric conversion layer and the second electrode are sequentially stacked away from the substrate; the pixel unit further comprises at least three conductive patterns, which are located between the photoelectric conversion element and the substrate, the at least three conductive patterns are sequentially stacked away from the substrate and insulated from each other, and signals of any two adjacent ones of the at least three conductive patterns and the first electrode are different, and the orthographic projections of any two adjacent ones of the at least three conductive patterns and the first electrode on the substrate at least partially overlap. The dynamic range of the photoelectric conversion substrate during use is significantly improved, and the detail presentation capability of the photoelectric conversion substrate for a collected image can be significantly improved.

The invention relates to a high-speed large-dynamic-range active pixel circuit and a working method thereof, an additional DCG transistor is adopted to realize an overflow pixel structure with medium conversion gain, and the pixel realizes work by collecting overflow charges to an LOFIC capacitor and combining a triple conversion gain reading mechanism. Meanwhile, the voltage domain storage unit allows the photodiode of the pixel to be released in the reading process, and parallel reading and exposure are achieved, so that high-speed imaging is supported. According to the invention, higher-quality and more real image information can be obtained under a more complex illumination condition, and a fast moving or dynamically changing scene can be better captured.

The application discloses a multi-modal imaging system and method based on an optical low-coherence interference field. The application can realize efficient interference signal collection and imaging under various OCT imaging modes in one set of system and imaging mechanism, and can realize mapping of imaging coordinate systems of various modes through linear transformation by combining the OCT axial imaging characteristics and the scanning setting under the same galvanometer mirror, so that the fusion display of multi-dimensional information in tissues can be completed without complex offline registration. The application can provide wide-area positioning imaging in a large depth range, structure imaging with high resolution and high signal-to-noise ratio, blood flow velocity detection and angiography with a large dynamic range, fast elastic imaging, and can also provide a real-time structure imaging mode with a large lateral field of view, so that a user can observe and operate according to the above information in a dynamic scene. The application has great significance for biomedical application scenes with multi-tissue information requirements.

The application discloses a large dynamic range imaging device and method, relates to the technical field of remote sensing imaging, and the device is characterized in that a rotating scanning component moves to a corresponding position according to a rotating instruction, and sends received radiation into an optical telescope component, and then converges to a light splitting component; the light splitting component divides the radiation into visible light and infrared rays, and respectively sends the visible light and the infrared rays into a visible light component and an infrared component; the visible light component focuses received visible light and obtains visible light signal data through multi-channel faint light detection; the infrared component collimates, focuses and multi-channel infrared detects received infrared rays to obtain infrared radiation signal data; a controller amplifies and processes the visible light signal data and the infrared radiation signal data, and obtains a ground object target image through data fusion, then determines corresponding ground object target line-of-sight angle information based on the ground object target image, and then generates a rotating instruction and sends the rotating instruction to the rotating scanning component. The application can obtain a remote sensing image with rich and complete data information under low illumination.

The application discloses a phase sensor system based on a nonlinear PT symmetry principle and a detection method thereof. The sensor system comprises: a gain end resonance circuit composed of a first inductor, a first capacitor and a nonlinear negative resistance in series; a loss end resonance circuit composed of a second inductor, a second capacitor and a positive resistance in series; and a coupling capacitor connected between the gain end resonance circuit and the loss end resonance circuit and achieving energy transmission between the two circuits. The current flowing through the gain end resonance circuit is a gain side current, and the current flowing through the loss end resonance circuit is a loss side current. High-sensitivity detection of external disturbance is realized by monitoring the phase difference between the gain side current and the loss side current. The application can realize high-sensitivity detection of a to-be-detected parameter in a wide dynamic sensitive range, and simultaneously has the characteristics of rapid response and noise suppression, thereby solving the technical problem that the existing PT symmetry sensing system is difficult to simultaneously consider a large dynamic range and high sensitivity.

The application relates to a low-power-consumption clock delay method and system in the technical field of integrated circuits, which comprises the following steps: based on a counting clock signal, the counting clock signal is phase-aligned with a clock signal to be delayed to generate a first phase clock alignment signal and a second phase clock alignment signal; the rising edge information and the falling edge information of the first phase clock alignment signal are extracted to obtain a pulse signal; the clock rising edge information and the clock falling edge information are split to obtain a first pulse filtering signal and a second pulse filtering signal; the first pulse filtering signal and the second pulse filtering signal are sequentially subjected to coarse delay, and after the coarse delay, signal synthesis processing is carried out to obtain a coarse delay clock signal; and based on a digital time converter, the coarse delay clock signal is subjected to fine delay to obtain a fine delay clock signal, thereby solving the problem that the existing delay technology cannot simultaneously realize high delay precision and a large dynamic range under low power consumption.

The present application belongs to the technical field of radar liquid level measurement, and aims at the problems that the existing liquid level measurement system is difficult to realize common probe operation, impedance matching requirements are different, and double-mode signal crosstalk is serious, and provides a kind of TDR and FMCW common probe adaptive matching liquid level measurement system and method, the control processing module configures the matching network of different working modes according to the matching parameters output by the double-mode adaptive impedance matching module, the double-mode signals share the same probe for cooperative measurement, the double-mode adaptive matching module is used for real-time double-mode impedance matching and dynamic adjustment of liquid level measurement, cooperative work under the same probe, real-time adjustment of probe impedance state, and realization of signal dynamic matching.The present application has the advantages of low reflection loss, small measurement blind area, large dynamic range, strong anti-interference ability and good adaptability to complex working conditions, and is suitable for long-term operation and detection in complex environment.

The invention discloses a method and a system for improving resolution and linearity of a time sequence generator based on an FPGA (Field Programmable Gate Array), and belongs to the technical field of automatic test equipment. In order to solve the problem that an existing FPGA time sequence generator is difficult to consider high resolution, large dynamic range and high linearity at the same time, a multi-phase clock and coarse and fine delay lines of a carry chain are adopted to form a three-level time interpolation framework, and picosecond interpolation in the large dynamic range is achieved with extremely few logic resources; meanwhile, a time measurement channel is constructed in the chip to obtain actual physical delay, the actual physical delay is transmitted to the upper computer to execute a selection algorithm, and a target delay code with the minimum integral nonlinear error is screened out to update the delay code table. According to the invention, non-linear deviation caused by bottom hardware wiring is effectively overcome, the accuracy of time sequence edge placement and the system test rate are remarkably improved, and the method is mainly used for high-precision time sequence signal generation in digital integrated circuit automatic test equipment.

The application discloses a multi-zone multi-spectrum detection device and a multi-zone multi-spectrum detection method thereof. The multi-zone multi-spectrum detection device has a plurality of detection zones, and the detection zones are provided with a plurality of spectral channels of different wave bands. The multi-zone multi-spectrum detection method comprises the following steps: combining actual detection signals of at least two detection zones whose actual detection signals of at least one spectral channel are less than a threshold value. The multi-zone multi-spectrum detection method can realize multi-zone multi-spectrum detection, has a large dynamic range of light intensity, and has a high signal-to-noise ratio.

The invention provides a photoelectric conversion substrate and a flat plate detection device. The photoelectric conversion substrate comprises a first area, the photoelectric conversion substrate comprises a substrate body and at least one pixel unit, and the pixel units are located on one side of the substrate body and located in the first area; the pixel unit comprises a photoelectric conversion element located on one side of the substrate; the photoelectric conversion element comprises a first electrode, a photoelectric conversion layer and a second electrode, and the first electrode, the photoelectric conversion layer and the second electrode are sequentially stacked away from the substrate; the pixel unit further comprises at least three conductive patterns which are located between the photoelectric conversion element and the substrate, the at least three conductive patterns are sequentially stacked away from the substrate and insulated from one another, and signals of any two adjacent conductive patterns in the at least three conductive patterns and the first electrode are different. Orthographic projections of any two of the at least three conductive patterns and the first electrode on the substrate are at least partially overlapped. The dynamic range of the photoelectric conversion substrate in the use process is greatly improved, and the detail presentation capability of images collected by the photoelectric conversion substrate can be greatly improved.

The invention provides an FPGA-based programmable periodic pulse signal generation method and application thereof, and belongs to the technical field of electronic measurement. In order to solve the problems that the large dynamic range and the high resolution are difficult to consider at the same time and hardware resources are consumed synchronously by multiple channels in the prior art, according to the method, coarse delay is achieved through FPGA system clock counting, and next pulse parameters are calculated through accumulation of remaining decimal parts; picosecond-level fine delay is realized by constructing a three-level cascade architecture consisting of a lookup table, a coarse carry chain and a fine carry chain; and XOR synthesis waveforms after rising edges and falling edges are independently generated respectively. In addition, the inter-channel transmission delay difference is compensated by correcting the initial calculation parameters. According to the multi-channel pulse signal generation circuit, high-precision, low-jitter and strictly-aligned-phase multi-channel pulse signals can be generated only by utilizing pure logic resources of the FPGA.

The application discloses a kind of FPGA-based timing generator resolution and linearity promotion method and system, belong to automatic test equipment technical field.For the problem that existing FPGA timing generator is difficult to consider high resolution, large dynamic range and high linearity, the application adopts multi-phase clock and carry chain coarse, fine delay line to form three-stage time interpolation architecture, to realize picosecond-level interpolation of large dynamic range with very few logic resources;At the same time, the actual physical delay is obtained by constructing a time measurement channel in the chip, and is transmitted to the host computer to execute the selection algorithm, and the target delay code with the smallest integral nonlinear error is selected to update the delay code table.The application effectively overcomes the nonlinear deviation caused by the underlying hardware wiring, significantly improves the accuracy of timing edge placement and the system test rate, and is mainly used for generating high-precision timing signals in digital integrated circuit automatic test equipment.

The present application relates to the technical field of image processing, and provides an image processing method and apparatus, a device, and a storage medium. The method comprises: when the illuminance of a target environment is less than an illuminance threshold and a dynamic range is greater than a dynamic range threshold, on the basis of brightness information of a live picture of the target environment, determining an environment type corresponding to the target environment, wherein the environment type is used for representing an illuminance level of the target environment and the proportion of a high-brightness region, and the brightness of the high-brightness region is greater than a preset brightness; and then on the basis of the environment type, performing, in a targeted manner, brightness adjustment on an initial image acquired for the target environment, so as to obtain a target image.

This application relates to the field of infrared remote sensing instrument calibration technology, and provides a high-dynamic-range, large-aperture, high-precision on-board blackbody radiation source and its temperature control method. The main body of this on-board blackbody radiation source is temperature-controlled by a refrigerator, exhibiting a large dynamic range, capable of temperature control from 200K to 310K. Through a three-layer structure consisting of the radiation source cavity, a cooling inner shell, and an outer shell, zoned temperature control via a heat transfer bracket, and a three-layer thermal insulation installation design, the temperature uniformity and stability of the blackbody radiation source are significantly improved, with temperature uniformity exceeding 30mK. Simultaneously, it possesses high emissivity (spectral emissivity reaching 0.998) and an aperture as large as 310mm, meeting the requirements for large field-of-view, long-distance use.

A method for processing an image acquired by a fingerprint sensor, comprising: determining (200) a peak value (R) associated with a pixel in the image and a valley value (V) associated with the pixel; calculating (202) a normalized dynamic range (Dn) associated with the pixel as a ratio of the difference between the peak value (R) associated with the pixel and the valley value (V) associated with the pixel, and a reference value being a linear combination of the peak value (R) associated with the pixel and the valley value (V) associated with the pixel; comparing (204) the normalized dynamic range associated with the pixel and a dynamic range threshold (T1); and generating a result associated with the pixel, the result associated with the pixel indicating that the pixel is showing a finger to the fingerprint sensor only if the normalized dynamic range (Dn) is greater than the dynamic range threshold (T1). Figure for the abstract: Fig. 3

The application discloses a PON distributed intelligent computing task scheduling method and belongs to the technical field of optical access network communication technology. The application obtains the link attenuation coefficients of each optical network unit through an optical line terminal and broadcasts; the allocation information of a differential double-wavelength channel and a gradient vector is established and broadcasted; a differential double-wavelength mapping is used to allocate target optical power to gradient components, and each unit is instructed to transmit after compensation in combination with the attenuation coefficients; optical signals are received on the differential double-wavelength channel and are converted into photoelectric current, and a global gradient vector is constructed after dark current is eliminated; the maximum value of the net photoelectric current difference value is counted to adaptively update the mapping coefficients and broadcast, and the global model parameters are updated and issued to each unit to complete synchronization. The application solves the problems of communication bottlenecks in the existing gradient aggregation and a large dynamic range of optical signal power.