252 results about "Wide dynamic range" patented technology

A high-density tactile sensing array based on a bionic microstructure comprises a flexible substrate for providing mechanical flexibility and packaging protection; the bionic microstructure layer is composed of a pyramid array or a hemisphere array and is used for enhancing sensitivity and spatial resolution; the carbon nanotube (CNT) sensitive layer uniformly covers the surface of the microstructure and converts pressure change into an electric signal; according to the thin film transistor signal reading system, active matrix design is adopted, pixel-level signal extraction is achieved through a row-column addressing strategy, and electric signals are rapidly and accurately processed. According to the preparation method, photoetching, wet etching and hot reflux processes are combined, precision machining of a microstructure is achieved, and a uniform CNT sensitive layer is formed through a spraying technology. According to the design method, microstructure parameters and sensitive layer characteristics are optimized through equivalent circuit model construction and simulation verification, and collaborative optimization of high sensitivity and wide dynamic range is achieved. The invention has the advantages of high sensitivity, high spatial resolution, low crosstalk, quick response and the like.

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 relates to the technical field of digital playing equipment, and provides a lossless control method for the volume of a digital player and the digital player. The method comprises the following steps of: after receiving a target volume parameter, executing dynamic multiplying power oversampling and high-order noise shaping on an input digital audio signal, and injecting preset jitter to suppress in-band quantization distortion so as to generate an optimized digital audio stream; meanwhile, a high-resolution digital reference current control instruction corresponding to the target volume is independently generated, output of a reference current source is adjusted according to the high-resolution digital reference current control instruction, and a high-precision differential current signal is obtained by combining nonlinearity, temperature excursion and quantization errors of a closed-loop feedback compensation device through a multi-bit current segmentation network; performing bias stabilization processing on the signal, and converting the signal into a differential voltage signal for suppressing common-mode noise through a precision differential resistance network; and finally, low-distortion differential analog audio signals capable of directly driving a load are output through low-distortion gain, impedance conversion and power driving, so that low-distortion, high-signal-to-noise-ratio and wide-dynamic-range output in a full-volume range is realized.

The invention relates to the technical field of image processing, in particular to an image data desensitization method, device and equipment, and the method comprises the steps: extracting a to-be-processed image or a RAW domain image of a to-be-processed video stream; sequentially performing wide dynamic range processing, first Bayer noise processing and tone mapping processing on the RAW domain image to obtain a first processed image; obtaining a dynamic ROI detection model and a privacy grading model; based on the first processing image and the dynamic ROI detection model, a second processing image is output, and the second processing image is that a privacy area is marked on the first processing image; based on the second processing image and a privacy grading model, obtaining a privacy level comprehensive score of each privacy area; and determining a corresponding desensitization means based on the privacy level comprehensive score of each privacy area so as to carry out pixel level privacy processing on the second processing image, and realizing end-to-end security privacy protection by processing the RAW domain image of the video or the image.

The invention belongs to the field of power equipment monitoring, and discloses a lightning arrester on-line monitoring system and method based on non-contact differential electric field probe self-adaptive compensation, a non-contact differential voltage probe is adopted, the sensitivity to environmental noise and interference to other-phase high-voltage buses is remarkably reduced through differential measurement, and the monitoring accuracy is improved. And the self-adaptive compensation algorithm is combined, so that the measured signal can be corrected in real time according to the on-site electromagnetic environment change, the amplitude and phase distortion can be effectively inhibited, the accuracy and reliability of the high-voltage side bus voltage acquisition can be improved, and the overall monitoring precision can be obviously improved. According to the invention, high-sensitivity and wide-dynamic-range measurement of lightning arrester current is realized by adopting the fluxgate weak current sensor, accurate detection under small signals is guaranteed, and fine analysis of harmonic components is facilitated.

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.

The invention relates to an anti-interference ADC (Analog to Digital Converter) biopotential sampling system, which solves the contradiction that a small-dynamic-range ADC is easy to saturate and a large-dynamic-range ADC is high in cost through time division multiplexing of a high-range ADC and a low-range ADC in combination with a signal compensation technology, and realizes the unification of a wide dynamic range and high-frequency signal fidelity. The first ADC processing branch firstly measures main components of signals and generates compensation signals, the second ADC processing branch carries out fine measurement on residual signals, after the two branches are superposed, the overall dynamic range of the system is expanded, and signal saturation or detail loss caused by range limitation of a single ADC is effectively avoided; on the premise that the real-time performance of signals is guaranteed, high signal-to-noise ratio and wide-range compatible accurate sampling is achieved with low hardware cost, and the invention further provides an anti-interference ADC biopotential sampling method.

The invention discloses a high dynamic range image processing method, electronic equipment and a readable storage medium, and relates to the technical field of image.The method comprises the steps that when shooting is carried out in an HDR mode, the exposure amounts and the frame numbers corresponding to a short exposure frame, a middle exposure frame, a long exposure frame, a first middle frame and a second middle frame are determined, the exposure amount of the first intermediate frame is greater than the exposure amount of the short exposure frame and less than the exposure amount of the intermediate exposure frame, and the exposure amount of the second intermediate frame is greater than the exposure amount of the intermediate exposure frame and less than the exposure amount of the long exposure frame; and generating a high dynamic range image according to the short exposure frame, the middle exposure frame, the long exposure frame, the first middle frame and the second middle frame. Based on the scheme of the invention, a relatively large exposure span can be set, and the HDR image is generated by fusing the original images with more than three exposures, so that a relatively wide exposure dynamic range is realized, the HDR image with a relatively wide dynamic range is obtained, and a relatively good HDR imaging effect is provided for a user.

The invention relates to the field of spaceflight measurement and control, and discloses a large-scale constellation multiple access measurement and control spread spectrum signal de-spreading bit width quantization method. Signal samples are counted, a noise deterioration factor and a bit width quantification model are respectively established, the de-spreading bit width is accurately expanded, and the optimal balance of resources and performance is realized. The method solves the problem that the detection range of strong and weak signals is limited when a single receiver detects multi-satellite same-frequency signals at the same time, remarkably improves the system capacity, and has the characteristics of quantizability, large dynamic range and multi-constellation adaptation.

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.

The invention relates to the technical field of quantum precision measurement, in particular to an optical fiber hydrophone based on an adaptive differential weak value measurement technology, which comprises a light-emitting module, a front selection state module, a weak coupling module and a rear selection state module, and is characterized in that the light-emitting module is connected with the front selection state module, and the rear selection state module is connected with the weak coupling module; the output end of the front selection state module is connected with the input end of the weak coupling module through the phase modulation unit and the first partial division unit, the output end of the weak coupling module is connected with the input end of the rear selection state module through the second partial division unit, and the output end of the rear selection state module is connected with the phase modulation unit. Through a push-pull probe structure, differential signal processing and an adaptive modulation process, high-sensitivity and wide-dynamic-range underwater acoustic signal detection is realized.

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.

To increase the frame rate and reduce power consumption with a wide dynamic range for photoelectric conversion. An imaging device includes: a first photoelectric conversion unit; a first read-out circuit that outputs to a first signal line a first pixel signal corresponding to charges photoelectrically converted by the first photoelectric conversion unit; a second photoelectric conversion unit that has a smaller light-receiving area than the first photoelectric conversion unit; a second read-out circuit that outputs to a second signal line a second pixel signal corresponding to charges photoelectrically converted by the second photoelectric conversion unit; a pixel signal selector that selects the first pixel signal or the second pixel signal based on a result of comparing the second pixel signal with a reference signal; and an analog-to-digital converter that converts the pixel signal selected by the pixel signal selector into a digital pixel signal by comparing the pixel signal with a reference signal whose potential level changes over time.

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.

The invention discloses a double-range current measurement system based on a solid-state relay, and relates to the technical field of current measurement. The system comprises a closed-loop Hall current sensor, a first shunt resistor, a second shunt resistor, a solid state relay (SSR), a Hall conditioning IC and an external controller. Two shunt resistors with different resistance values are dynamically switched through a solid-state relay, and compatibility of low-current high-precision measurement and high-current wide-range measurement is achieved. The method solves the problems that the precision and range of an existing single-range sensor are difficult to consider, double sensors are high in cost, mechanical relays have defects and the like, has the advantages of low cost, high reliability, good measurement precision and the like, and is suitable for wide-dynamic-range current measurement scenes such as an energy storage system and the like.

The invention discloses a wide dynamic range frequency-selecting ultrahigh frequency conditioning method and system based on logarithmic detection, and relates to the technical field of high-voltage electrical equipment partial discharge detection, and the method comprises the steps: capturing a signal, and transmitting the signal to a conditioning circuit; a required path is controlled to be conducted based on the logic control circuit; filtering out-of-band noise signals and carrying out logarithmic detection. The circuit structure is clear and simple, ultrahigh frequency signals are analyzed by selecting different frequency band ranges, external interference is effectively removed, the detection sensitivity is higher, and the detection result is more accurate. The design of logarithmic detection after band-pass filtering avoids the problem of output nonlinearity caused by large signal input outside the frequency band, and effectively protects the device. According to the frequency band range characteristics of interference signals, a corresponding filter network is arranged on the frequency-selecting switch, and the detection frequency band is changed according to the field environmental noise. The signal is subjected to second band-pass filtering before entering the logarithmic detection circuit, so that the noise coefficient of the whole link is effectively reduced, and the influence of a noise signal newly generated by the conditioning circuit is reduced.

The invention discloses a piecewise linear quantization mixed structure analog-to-digital converter with a noise shaping function, and belongs to the field of analog-to-digital converters, the analog-to-digital converter comprises an input control circuit, a nonlinear quantization circuit, a noise shaping modulation circuit, an output control circuit and a digital decimation filter circuit, the control circuit samples an input signal; the non-linear quantization circuit determines a non-linear section where an input signal is located and provides reference voltage for the noise shaping modulation circuit; the noise shaping modulation circuit is used for performing noise shaping and fine quantization on an input signal; the output control circuit combines the two parts of quantization output and generates a high-speed low bit code stream; the digital decimation filter circuit receives a high-speed code stream and generates a high-precision digital code through decimation filtering; according to the technology provided by the invention, suitable nonlinear quantization characteristics are provided according to different signal characteristics, and meanwhile, higher quantization precision and a wider dynamic range can be realized.

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.

Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies a suitable dynamic range compression profile by either absolute values or differential values relative to another known compression profile. A playback device may also adaptively apply gain and limiting to the playback audio. Implementations in encoders, in transcoders and in decoders are disclosed.

The invention provides a metamaterial reconfigurable dual-polarized antenna array and a dynamic beam forming method thereof. The dual-polarized antenna array is composed of a metamaterial resonance unit array, a reconfigurable polarization network, an intelligent control unit and an adaptive beam forming algorithm. The metamaterial unit structure with the dual-polarization characteristic is designed, and continuous adjustment of the polarization state and the radiation characteristic is achieved by integrating the liquid metal microchannel and the variable capacitance diode. A hierarchical control framework and a deep reinforcement learning algorithm are adopted, self-adaptive optimization control over an antenna array is achieved, and the characteristics of high-precision beam forming, quick response and high energy efficiency are provided while low system complexity is kept. Flexible regulation and control of the polarization state, high-precision beam forming, low system complexity, quick response, high energy efficiency and wide dynamic range can be realized at the same time, so that the requirement of a future communication system on a high-performance antenna is met.

This invention provides a high-precision, wide-dynamic-range, and highly uniform motorized diaphragm. This diaphragm controls the transmitted radiant flux between integrating spheres. It ensures high uniformity, dynamic adjustability over a wide range, and high repeatability. When fully closed, light leakage is maintained at a radiant brightness output level of one millionth of that in the fully open state. This invention meets the performance requirements of highly uniform low-light radiation sources.

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 phase sensor system based on a nonlinear PT symmetry principle and a detection method thereof, and the sensor system comprises a gain end resonance circuit which is formed by connecting a first inductor, a first capacitor and a nonlinear negative resistor in series; the loss end resonance circuit is formed by connecting a second inductor, a second capacitor and a positive resistor in series; the coupling capacitor is connected between the gain end resonance circuit and the loss end resonance circuit and realizes energy transmission between the gain end resonance circuit and the loss end resonance circuit; current flowing through the gain end resonance circuit is gain side current, current flowing through the loss end resonance circuit is loss side current, and high-sensitivity detection of external disturbance is achieved by monitoring the phase difference between the gain side current and the loss side current. According to the invention, high-sensitivity detection of to-be-detected parameters can be realized in a wide dynamic sensitive range, and the system has the characteristics of rapid response and noise suppression, thereby solving the technical problem that an existing PT symmetric sensing system is difficult to give consideration to both large dynamic range and high sensitivity.

The present invention belongs to the field of testing technology, and specifically relates to an intelligent detection method for visual brightness based on digital imaging technology. Aiming at the problems of large volume, high cost, complex operation of traditional visual brightness measurement instruments, as well as poor accuracy and stability of visual brightness measurement, this method measures visual brightness through steps such as selecting a digital imaging device with adjustable parameters, high resolution and wide dynamic range, matching an adapter lens and a filter, constructing a response function of the digital imaging device, and establishing a conversion relationship between gray values and visual brightness. Specifically, it includes setting parameters of the digital imaging device, photographing a standard light source and establishing a relationship with the target, aligning the target area to acquire images, converting to the gray space for correction and calculating the visual brightness. During the process, the measurement accuracy is also improved by setting white balance, image preprocessing and fusing multiple captured images. This method is easy to operate, low in cost and strong in adaptability, and can effectively improve the measurement accuracy and stability.