138 results about "Wide dynamic range" patented technology

The invention discloses a wide-dynamic-range diamond NV color center magnetic sensing method and system, and the method comprises the steps: (1) calibrating the initial resonant frequency and magnetic sensing coefficient of a diamond NV color center in an initial magnetic field environment; (2) in a to-be-measured magnetic field environment, a microwave generator applies frequency-modulated microwaves to the diamond NV color center with the current resonant frequency as the center frequency; demodulating the fluorescence signal in real time by using a phase-locked detection technology to obtain an error signal; calculating the detuning amount of the center frequency in real time according to the error signal and the magnetic sensing coefficient, and further calculating the variable quantity of the magnetic field intensity; meanwhile, the detuning amount is fed back to a microwave generator to track the resonance frequency of the diamond NV color center; and (3) continuously and repeatedly executing the step (2) to realize wide-dynamic-range magnetic field measurement. The method has the advantages of wide dynamic range, high detection capability on strong and weak field mixed signals in a complex application scene and the like while giving consideration to the magnetic sensing sensitivity.

The invention discloses a three-dimensional temperature field online reconstruction system based on receiving and transmitting integrated sound wave sensing, and relates to the field of boiler monitoring. Comprising an information acquisition module, an emission control module, a reconstruction sensing module, a path optimization module, a sound wave receiving module, an amplitude limiting filtering module, a decoding separation module, a feature extraction module, a physical simulation module, a multi-source fusion module, a three-dimensional reconstruction module, a state monitoring module and an online calibration module. According to the method, the transmitted signal can still keep high identifiability in a high-noise and strong-interference background, the credibility of subsequent inversion and data assimilation is improved, a sensing network can be self-optimized, the observation precision and the space coverage capability are improved, a wide dynamic range and high linearity are realized, a simulation result is closer to a real working condition, and the method is suitable for large-scale popularization and application. And the reliability of temperature field inversion is obviously improved.

The invention discloses a quantum partial discharge detection system and method based on single photon measurement. The system comprises a photoelectric detection module and an information transmission and processing module which are connected in pairs. A free space light collection unit in the photoelectric detection module is used for converging photons of partial discharge radiation and guiding the collected photons to a classic weak light detection unit and a single photon detection unit respectively; the classic weak light detection unit is used for converting an optical signal into an electric pulse signal based on an internal photoelectric effect; the single-photon detection unit is used for detecting extremely weak light and even single-photon events and outputting discrete electric pulse signals. The classical weak light detection unit and the single photon detection unit operate in parallel, partial discharge optical detection with a wide dynamic range and a high signal-to-noise ratio is realized through a signal fusion and processing algorithm, electromagnetic interference is effectively inhibited, and a more comprehensive and reliable monitoring means is provided for evaluation of the insulation state of power equipment.

Provided is a buffer circuit that can realize a wide dynamic range, a reduced area, and a reduced power consumption amount while maintaining low output impedance. The buffer circuit includes a first transistor, a current source, a second transistor, an output terminal, and first and second capacitors. The first transistor has a gate to which an input signal is input. The current source is connected to one terminal of the first transistor. The second transistor is connected to the other terminal of the first transistor. The output terminal is connected to the one terminal or the other terminal of the first transistor. The first and second capacitors are between the current source and the gate of the second transistor. The first transistor, the second transistor, and the first capacitor form a first feedback circuit. The first transistor, the current source, and the second capacitor form a second feedback circuit.

An image capturing apparatus capable of generating a depth synthetic image with a wide dynamic range efficiently. The image capturing apparatus including a changing unit that changes a focus position, an image capturing unit that obtains images with different exposures by one exposure at each focus position, and a synthesis unit that generates a depth synthetic image having a wider dynamic range and a deeper depth of field than the images obtained by the image capturing unit using the images obtained by the image capturing unit.

The invention provides a wide dynamic range methane detection system based on synchronous accumulation and system reconstruction. The device is characterized by comprising a modulated laser (1), a gas absorption cell (2), a photoelectric detector (APD) (3), a variable gain trans-impedance amplifier (TIA) (4) based on a digital potentiometer, a dual-threshold voltage comparator circuit (5) and a microcontroller processing unit (6). The device can be used for large-dynamic-range real-time monitoring of the methane gas concentration, and the problem that a traditional TDLAS system is prone to saturation or limited in detection limit when the concentration span is large is effectively solved. The method can be widely applied to the fields of gas concentration detection, industrial safety control and the like.

The invention provides a self-wave-locking method and system based on laser photoacoustic spectrometry gas detection, and relates to the technical field of optical gas sensing, by fusing multi-physical field sensing data such as photoacoustic signals, sound field distribution, thermal deformation and the like, a first state vector representing the actual performance of a current system is calculated in real time, and a second state vector representing the actual performance of the current system is calculated in real time; a multi-objective optimization function is used for simultaneously optimizing a signal-to-noise ratio, linearity and energy consumption control to serve as a criterion, a cooperative control instruction is generated in a rolling mode, excitation light modulation parameters and cavity acoustic mode parameters are accurately adjusted, double dynamic tracking and locking of laser modulation frequency and cavity acoustic resonance frequency are achieved, and when external conditions change, the frequency of the cavity acoustic resonance frequency can be dynamically tracked and locked. According to the method, the detection sensitivity and the signal stability which are close to theoretical limits are automatically and continuously kept all the time, the calculated system nonlinearity index is used as an internal criterion, a concentration inversion mode is intelligently switched to carry out gas concentration value calculation, and seamless, continuous and wide dynamic range measurement from ppb level to percentage level is realized.

The invention discloses a wide dynamic underwater sound acquisition method suitable for an underwater glider and a hydrophone, and the method comprises the steps: configuring a unique hydrophone into four parallel band-pass filtering and amplifying circuits, each band-pass filtering and amplifying circuit having different acquisition frequency bands; after the underwater glider enters water, underwater sound collection is carried out based on the only installed hydrophone, and underwater sound signals of four collection frequency bands are collected at the same time through four parallel band-pass filtering and amplifying circuits. Through four paths of differentiated gains and frequency segmentation, the wide dynamic full frequency band can be covered, the dynamic range is improved, a single hydrophone integrates four channels, cables and installation space among multiple devices are saved, and the underwater glider compact layout is adapted; the channels are activated on demand, the total power consumption can be reduced, and the endurance time is prolonged. Under the conditions of low power consumption and limited volume of the underwater glider, wide dynamic range signal acquisition can be realized, and signals can be processed in real time.

According to the double-optical-path gas detection method based on the tunable diode laser absorption spectrum (TDLAS) technology, gas concentration is inverted through double-wavelength laser output, double-optical-path design and a maximum variable data processing algorithm, and multi-gas detection with high sensitivity and wide dynamic range is achieved; the method is especially suitable for distinguishing and concentration inversion of gases (such as methane and carbon monoxide) with similar absorption peaks. The core of the method is that a stepping motor is used for controlling a reflector to move so as to realize the double-optical-path design of the gas chamber; gases with similar absorption peaks can be effectively distinguished in combination with dual-wavelength laser output; the light intensity signals of the long optical path and the short optical path are synchronously processed by using the least square method, and the gas concentration is inversed through light intensity ratio calculation and matrix operation, so that the detection precision is improved. According to the double-optical-path gas detection method, double wavelengths and double optical paths are realized, meanwhile, the length of the optical path can be dynamically adjusted, and the double-optical-path gas detection method can be suitable for different scenes. The system is high in sensitivity, wide in dynamic range and capable of distinguishing multiple gases, and meanwhile the system is flexible, low in complexity and high in anti-interference capacity.

The invention provides a picoampere-level current measuring device and method with leakage estimation and digital compensation, and the device comprises an electrometer-level operational amplifier and a transimpedance feedback network which are used for converting a measured current into a voltage signal; in combination with a retaining ring conductor driven by a retaining ring buffer and an inner and outer double-layer metal shielding structure, high-resistance node leakage and external interference are remarkably reduced. The digital controller injects 5mV-50mV micro excitation into the retaining ring in a non-sampling window and detects output response so as to estimate input equivalent leakage conductance and perform online compensation; and meanwhile, environment self-adaptive correction is carried out according to a temperature and humidity-leakage admittance model. The system adopts a 24-bit analog-to-digital converter, two-stage zero-drift amplification and multi-point linearity calibration can be switched, picoampere-level current measurement with high precision, low noise and wide dynamic range is realized, and the system is suitable for the fields of high-insulation detection, light current measurement, electrochemical micro-current analysis and the like.

The invention discloses a Rogowski coil zero-region current sensor and a design method thereof, and relates to the technical field of current sensors, and the Rogowski coil zero-region current sensor comprises a central conductor, an insulating sleeve, a coil skeleton and a coil winding. The insulating sleeve coaxially sleeves the middle part of the central conductor, and the two ends of the central conductor are electric connection ends used for connecting an arc extinguish chamber test loop in series; the coil framework coaxially sleeves the periphery of the insulating sleeve; the coil winding is wound on the coil framework and is used for detecting current; the central conductor is made of a copper alloy material, and the surface of the central conductor is plated with silver; the ratio of the length to the outer diameter of the coil winding is 2-3; the mutual inductance coefficient of the current sensor is 10-50 [mu] H, and the dynamic range of output signals of the signal output end of the coil winding is-10 V to 10 V. The wide dynamic range, the high sensitivity and the broadband characteristics can be considered, and the characteristics of stable structure and good safety are achieved.

To widen a dynamic range and to stably use a device even when environmental temperature is changed.SOLUTION: The optical distance measuring sensor 101 includes a charge storage part 42 for storing electric charge for generating a pulse current to be given to a light emitting element 45, a setting part 21 for setting a target sensitivity of the optical distance measuring sensor, a pulse current control part 20 for generating a pulse current synchronously with a repetitive signal and pulse-driving the light emitting element, and adjusting the pulse current based on the target sensitivity, a light receiving element 35 for receiving reflected light, a first temperature sensor 33, a nonvolatile memory 32 for storing characteristic data of the individual light receiving element, a calculation part 2 for calculating a time from irradiation of light to an object to reception of reflected light based on a temperature measured by the first temperature sensor, the characteristic data and the target sensitivity.SELECTED DRAWING: Figure 1

A kind of dynamic contrast optimization system and method based on vehicle-mounted multimode vision belongs to image enhancement technical field, in order to solve the problem that prior art will amplify noise when widening dynamic range, strong denoising then loss texture details, and cause block distortion, picture flicker and multi-frame ghosting, and then reduce vehicle-mounted visual perception accuracy, dynamic contrast optimization method based on vehicle-mounted multimode vision is by real-time synchronous acquisition vehicle-mounted visible light, infrared image, according to illumination, definition and noise amplitude, screening and eliminating inferior data, decomposing effective image into three components of illumination, texture, noise, optimizing illumination dynamic range by partition, according to noise level, hierarchical denoising retains texture details, fusion two components corrects image deviation distortion, completes double image registration fusion and smooth adjustment contrast, finally outputs high-quality optimized image, the technical scheme in the application fully restores the detail level of highlight and dark area, and effectively suppresses various imaging noises.

The invention discloses a wide dynamic range rectifier based on an automatic power distribution mechanism. The wide dynamic range rectifier comprises a high-power sub-rectifier and a low-power sub-rectifier, the high-power sub-rectifier comprises a high-power rectification trunk and a high-power rectification branch; the low-power sub-rectifier comprises a low-power rectification trunk and a low-power rectification branch; through the synergistic effect of a threshold switch control circuit and a tunable matching network arranged in a low-power rectification branch, the low-power rectification branch provides inductive impedance in a low-power state to compensate the inherent capacitive impedance of a low-power rectification diode, and presents a high-impedance state in a high-power state to turn off a low-power sub-rectifier. Therefore, the adverse effect of the low-power sub-rectifiers on the high-power sub-rectifiers is avoided while high-efficiency energy conversion in the low-power interval is ensured, and the overall rectification efficiency in the high-input power interval is remarkably improved.

The application discloses a circuit structure based on a high-gain photosensitive device, and is proposed in view of the problem of high dark current in the prior art. Mainly by regulating the gate voltage of two series MOS tubes when the optical signal is zero input, the current difference of the two is zero, and at least one of the MOS tubes is a PD-MOS. The advantage is that compared with the traditional photoelectric sensor, it has lower noise current and dark current, and realizes that the device has wide dynamic range and high sensitivity in small size. The PID has the functions of small size, high sensitivity, high gain and wide dynamic range; and has the functions of low dark current, low noise and low temperature drift. The pixel array prepared based on the PID can consider random reading and adopt spatial correlation double sampling to realize the way of reducing FPN, and the dynamic range of the random reading active pixel circuit of the embodiment of the application can be up to 160 dB. The high performance of the pixel is realized from the device level, and the working interval can be independently controlled through bias setting.

The embodiment of the invention provides a wide dynamic range signal acquisition method and circuit, and the method comprises the steps: a quadrupole is connected with an ion receiving electrode, the ion receiving electrode is connected with a transimpedance amplifier circuit, the transimpedance amplifier circuit is connected with a threshold comparison circuit, the threshold comparison circuit is connected with a D trigger circuit, and the D trigger circuit is connected with a dead time correction circuit. The lower computer FPGA is connected with the D flip-flop circuit; the quadrupole is used for screening ion signal output; the ion receiving electrode is used for converting the ion signal into a current signal; the transimpedance amplifier is used for converting the current signal into a voltage signal; the threshold comparison circuit is used for turning the voltage signal into a logic level; the D flip-flop circuit is used for outputting a target signal level matched with the lower computer FPGA; and the lower computer FPGA is used for receiving the target signal level and counting the signals acquired by the plurality of pulses through the dead time correction circuit. In this way, the phenomenon of counting omission under high-frequency signals is reduced, and the counting accuracy is improved.

It ensures a wide dynamic range for light metering and suppresses image flicker near the maximum aperture setting of the electronic shutter. [Solution] The endoscope device includes a processor that processes the image signal output from the image sensor. The processor acquires exposure correction information based on a target value for exposure time and the amount of exposure control actually applied to the image sensor, and adjusts the gain of the image signal acquired from the image sensor based on the exposure correction information.

The embodiment of the invention provides a wide dynamic range ion pulse threshold adaptive counting method and circuit, and the method comprises the steps: a first end of an electron multiplier is connected with an ion signal, a second end is connected with an input end of an amplification circuit, an output end is connected with a first end of a baseline extraction module, and a second end is connected with a first end of a baseline smoothing module; the second end is connected with the input end of the comparison circuit and the output end is connected with the counting circuit; the electron multiplier is used for converting the ion signal into a current pulse; the amplifying circuit is used for converting the current pulse into a voltage pulse; the baseline extraction module is used for extracting a voltage pulse baseline to obtain a baseline signal; the baseline smoothing module is used for smoothing the baseline signal to obtain a smoothed signal; the comparison circuit is used for dynamically determining a self-adaptive threshold value based on the smooth signal, comparing the voltage pulse with the self-adaptive threshold value and outputting a comparison signal; and the counting circuit is used for pulse counting to obtain the number of target pulses. Therefore, the counting accuracy and the counting upper limit are improved.

The invention provides a phase sensing system and method based on weak measurement, which can be applied to the field of quantum sensing. According to the system, a phase sensing module carries out phase modulation on pre-selected incident light according to a signal to be detected to obtain detection light; four post-selection modules respectively post-select four parts of light obtained by detecting the light; the detection module detects the first post-selection light, the second post-selection light, the third post-selection light and the fourth post-selection light respectively; the processing module calculates a first item according to the first light intensity and the fourth light intensity and / or the second light intensity and the third light intensity; calculating a second item according to the first light intensity and the second light intensity and / or the third light intensity and the fourth light intensity; processing the predetermined angle and a first ratio obtained according to the first item and the second item by using an arc tangent function to obtain a phase signal, and realizing wide dynamic range detection of the phase signal; and performing linear transformation on the phase signal to obtain the size of the to-be-detected signal, thereby realizing wide dynamic range detection of the to-be-detected signal.

A low power high bandwidth analog to digital converter system is disclosed. A first analog signal input receives an input signal. A first programmable gain amplifier receives the input signal. An analog to digital converter (ADC) is coupled to the output of the first programmable gain amplifier and samples the input signal for conversion to a digital signal. A controller is coupled to the ADC and the first programmable gain amplifier. The controller selects and enables either a reduced power mode or a power up mode for the first programmable gain amplifier and the ADC. The power up mode is selected and enabled when the input signal is to be sampled to operate the first programmable gain amplifier and the ADC to sample the input signal.

The invention provides a monitoring method and system, a training method, electronic equipment and a computer storage medium, and relates to the technical field of computer vision and image processing. The method comprises the following steps: acquiring an image frame and an event stream of a target scene; preprocessing the image frame and the event stream to obtain a first image feature and a first event feature; aggregating the first event features based on a plurality of preset time windows to generate fused event features; performing cross-modal attention calibration and spatial alignment on the first image feature and the fusion event feature to generate a fusion feature; and reconstructing and outputting an extreme visual image based on the fusion feature and an ambient illumination level estimated according to the image frame and the event stream. The enhanced image with clear details and wider dynamic range is reconstructed under extreme conditions such as extremely dark and overexposure, the perception robustness and target recognition accuracy of the monitoring system under complex illumination are improved, the processing efficiency is considered, and all-weather monitoring can be realized.

The invention discloses a low-current high-precision acquisition method for a high-power cascade converter, and relates to the technical field of power electronic application, and the method comprises the steps: building the high-power cascade converter with a cascade topological structure, and enabling a power unit to comprise a first-stage power unit and a general power unit; hall sensors with different measuring ranges and insulated gate bipolar transistors with different powers are installed in the first-stage power unit, and the wiring direction is adjusted according to an output port; calculating a current effective value in the first-stage power unit based on a current signal of the Hall sensor, comparing the current effective value with a preset current threshold value, and dynamically adjusting the working mode of the first-stage power unit; the first-stage power unit transmits a sampled current value to a converter control system through a high-speed optical fiber. By designing the wide-dynamic-range high-precision acquisition method for the high-power high-voltage cascade converter, the problem of full-range high-precision measurement of the current of the high-voltage cascade converter is effectively solved.

The invention discloses a high-frequency signal detection circuit and a detection method, and belongs to the technical field of communication. The circuit comprises a detector, an operational amplifier and a comparator which are electrically connected in sequence. The detection method comprises the following steps: converting an input high-frequency signal into a direct-current voltage signal through a logarithmic detector; amplifying the direct-current voltage signal by using an operational amplifier; comparing the amplified voltage with a preset threshold level which can be flexibly adjusted; and the comparator outputs a high-level or low-level pulse signal according to a comparison result. By adopting the integrated logarithmic detector, the operational amplifier and the comparator, the advantages of wide dynamic range, high stability, compact structure and flexible adjustment are realized, and the high-frequency signal detector is suitable for various high-frequency signal detection application scenes such as a portable receiver and an embedded communication system.

The application discloses a kind of three-dimensional temperature field online reconstruction systems based on transceiving integrated acoustic wave sensing, it is related to boiler monitoring field, including: information acquisition module, launch control module, reconstruction sensing module, path optimization module, acoustic wave receiving module, limiting amplitude filter module, decoding separation module, feature extraction module, physical simulation module, multi-source fusion module, three-dimensional reconstruction module, condition monitoring module and online calibration module;The application can make transmitting signal still maintain high distinguishability in high noise, strong interference background, improve the reliability of subsequent inversion and data assimilation, make sensing network can self-optimization, improve observation accuracy and spatial coverage capability, realize wide dynamic range and high linearity, make simulation result more close to real working condition, significantly improve the reliability of temperature field inversion.

The invention relates to an intelligent brain wave disease diagnosis system which comprises a brain wave electrode, an intelligent analysis module and a brain wave information base. The brain wave electrode is used for collecting brain waves of a patient, converting the brain waves into brain wave signals and sending the brain wave signals to the intelligent analysis module; the intelligent analysis module is used for receiving the brain wave signals, storing or newly creating brain wave data, and intelligently diagnosing diseases so as to output disease diagnosis results; the brain wave information base is used for updating and storing disease brain wave data, diagnosis conclusions and treatment schemes. According to the intelligent brain wave disease diagnosis system and method provided by the invention, a dual-channel interleaving sampling technology is adopted, brain wave signals are collected at different sampling rates and resolutions, high-precision and wide-dynamic-range digital signals are generated, five kinds of brain waves including alpha waves, beta waves, gamma waves, delta waves and theta waves are covered, a characteristic matrix is established from seven dimensions including frequency, amplitude and waveform, and the diagnosis accuracy is improved. Brain wave fine features are comprehensively captured, three-dimensional recognition of abnormal states is achieved, and the misdiagnosis and missed diagnosis probability is greatly reduced.

This invention discloses a variable-step automatic gain control method based on an adaptive window, applicable to signal automatic gain control in data acquisition systems. The method preprocesses the input signal and samples it using an ADC to obtain a digital signal, which is then fed into an FPGA. A zero-crossing detection method based on a hysteresis comparator is used to estimate the signal frequency, and the window length is calculated based on this adaptive amplitude matching. The average signal amplitude within the window is then calculated and compared with a preset automatic gain threshold range. The gain step value is dynamically matched and updated to the variable gain amplifier to complete closed-loop control. Finally, the gain value is used to perform an amplitude inverse calculation to restore the signal. This invention improves the detection accuracy and dynamic response speed of the system over a wide bandwidth and dynamic range, eliminates the hardware resource consumption of floating-point division operations, and accurately outputs a distortion-free original proportional signal stream.

The application belongs to the technical field of high-energy physics particle detection, and particularly relates to a high-sensitivity fixed beam damage system based on EQR-SiPM and a quartz rod, which comprises the following steps: one end of the quartz rod is inserted into a containing cavity of a SiPM dark box, and the end face is optically coupled with a photosensitive surface of an EQR-SiPM integrated on a SiPM circuit board; on the SiPM circuit board: an output end of a voltage amplification circuit is connected to a signal input end of a SiPM signal processing system through an SMA interface and a coaxial cable, and a signal output end is connected to a central control OPI through a control network; and a attenuator is further connected in series between the output end of the voltage amplification circuit and an analog input end of the SiPM signal processing system. The application can identify weak beam damage of the order of 10^(-18) J by virtue of high photon detection efficiency and high light transmittance of the quartz rod, and has the characteristics of high sensitivity, nanosecond-level time resolution, anti-magnetic field interference, wide dynamic range, and small and compact structure.

The invention discloses a three-dimensional force tactile sensor based on an asymmetric capacitor and a force decoupling method thereof, and belongs to the technical field of sensors, and the method comprises the following steps: step 1, applying pressure by a three-dimensional force; step 2, structural deformation and response; step 3, capacitance data association; step 4, signal processing; 5, force type judgment; and 6, calculating and outputting the three-dimensional force. Through the asymmetric series capacitor physical decoupling technology, the limitation of traditional algorithm decoupling is eliminated, the coupling interference between force signals is greatly reduced, the precision of force detection is remarkably improved, and a scientific and reliable basis is provided for force sensing of scenes such as flexible operation and industrial force control; besides, the design of the gradient modulus dielectric layer realizes wide dynamic range coverage, effectively solves the defect that the sensitivity and the range are difficult to consider at the same time, adapts to various scenes such as micro-force fine sensing and heavy-load force monitoring, and provides full-scene accurate sensing capability for force haptic application under complex working conditions.

A conductivity detector module for an ion chromatography system includes a detector unit configured to receive an eluate stream from the ion chromatography system, the detector unit including a first electrode and a second electrode in electrical contact with the eluate stream; a first current branch coupled to the first cell drive input and the first electrode and providing a first cell output; and a second current branch coupled to a second unit driving input and the second electrode and providing a second unit output, wherein the first unit driving input and the second unit driving input are equal in size and opposite in sign.

This invention relates to a wide dynamic range laser spectroscopy gas concentration detection device and method. The device includes: a long-path absorption cell comprising two opposing first and second concave mirrors, wherein during operation, a first laser beam undergoes multiple reflections between the two concave mirrors to form a first absorption optical path; an optical resonant cavity sharing a gas cavity with the long-path absorption cell, comprising a second entrance window and a second exit window disposed at the geometric center region of the first and second concave mirrors, wherein the geometric center region is the non-spot region of the first laser beam; and a pair of high-reflectivity mirrors respectively disposed on the second entrance window and the second exit window, wherein during operation, the second laser beam undergoes multiple reflections between the two high-reflectivity mirrors to form a second absorption optical path; the second absorption optical path is not less than 100 times the first absorption optical path. This invention combines the advantages of both the long-path absorption cell and the optical resonant cavity, achieving full-range gas concentration measurement from ultra-low concentrations (ppb) to percentage concentrations through a single gas chamber.