208 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 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 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.

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 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.

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 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 invention relates to an MEMS sensor and electronic equipment. The MEMS sensor comprises a substrate provided with a back cavity and a first detection unit. The first detection unit comprises a first insulating film, a first electrode layer, a second insulating film and a first supporting column which are sequentially stacked. First hollow grooves are formed in the first electrode layer at intervals; the first supporting columns penetrate through the corresponding first hollow grooves, and the two ends of the first supporting columns are connected with the insulating films on the two sides of the first electrode layer respectively; wherein a first electrode part is arranged between the two ends of each first supporting column, a gap is formed between the side wall of each first electrode part and the inner wall of the corresponding first hollow groove, and the first electrode parts and the inner walls of the first hollow grooves jointly form a detection capacitor. Mechanical sensitivity and electrical sensitivity are decoupled, the first hollow grooves are formed in the first electrode layer, the first hollow grooves and the corresponding first supporting columns form detection capacitor array parallel connection / differential output, high-order distortion under large deflection and complex loads is restrained, and high sensitivity, high linearity and long-term reliability in a wide dynamic range are achieved.

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.

Provided are an image sensor, a solid-state imaging device, and a control method of the image sensor, the image sensor including: a first pixel and a second pixel each including a photodiode and a floating diffusion region, the floating diffusion region being connected in series with the photodiode; the first end and the second end of the first switch transistor are respectively connected between the floating diffusion region and the photodiode in the two pixels; the first pixel and the second pixel respectively comprise an overflow transistor, and the first end and the second end of the overflow transistor are respectively connected with the photodiode and the power supply voltage. The invention provides an image sensor, a solid-state imaging device, and a control method of the image sensor, which can realize a wide dynamic range.

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 nonlinear parameter measurement method and device of a photoelectric device, electronic equipment and a medium, and relates to the technical field of metering of photoelectric devices. At least one group of a first light source and a second light source is obtained; obtaining mixed emergent light; controlling the tested photoelectric device to capture the mixed emergent light, and converting the mixed emergent light into an electric signal; collecting a characteristic signal point set; and on the basis of the characteristic signal point set, obtaining a nonlinear parameter of the tested photoelectric device. According to the invention, automatic and rapid measurement of nonlinear parameters of the photoelectric device is realized. By regulating and controlling the peak wavelength, the bandwidth, the optical power, the pulse frequency, the duty ratio and the amplitude of the first incident light and the second incident light, the influence of factors such as light source mismatching and power drift of the light source on nonlinear parameter measurement is reduced, and the efficiency and the accuracy of nonlinear parameter measurement of the photoelectric device are improved. Meanwhile, non-linear spectrum dependence characterization and wide dynamic range characterization spanning multiple orders of magnitude are also realized.