85 results about "Charge amplifier" patented technology

The utility model provides an environment-adaptive wind generating set vibration signal intelligent acquisition device, and belongs to the technical field of wind generating set vibration monitoring. The problems of poor sensor arrangement flexibility and poor signal transmission stability in existing wind power generation recording vibration monitoring are solved. Comprising a vibration sensor, a charge amplifier, a data acquisition module and a microprocessor which are arranged on a cabin cylinder of the wind generating set, the output end of the vibration sensor is connected with the input end of the charge amplifier, the output end of the charge amplifier is connected with the input end of the data acquisition module, and the output end of the data acquisition module is connected with the microprocessor; wherein tracks are fixed on the inner surface and the outer surface of the cabin cylinder, at least one moving trolley is arranged on the tracks, and the vibration sensors are fixed on the moving trolleys; the vibration monitoring device is applied to vibration monitoring of the wind generating set.

The invention relates to the technical field of automobile electrical detection, provides an automobile wire harness wire insulation skin damage detection method and system, and aims to solve the technical problem that a certain loop insulation skin damage position point is difficult to find in the prior art. Comprising a plane capacitance sensor used for measuring capacitance change between the plane capacitance sensor and a to-be-measured wire harness to obtain a charge signal used for representing the damage state of an insulating material of the to-be-measured wire harness; the charge amplifier is used for performing voltage conversion and amplification processing on the charge signal to obtain a voltage signal; the impedance analyzer is used for calculating impedance through the voltage signal and the current signal, drawing a Bode diagram based on the obtained impedance, and performing index parameter extraction on the Bode diagram to obtain various index parameters; and the upper computer is used for carrying out feature extraction on the multiple index parameters to obtain feature data, and analyzing the damage state of the insulating material of the wire harness to be detected according to the feature data to obtain a detection result.

A device and method for representing the foam porosity state of foamed lightweight soil with self-adjusting beams, and relates to the technical field of sound absorption coefficients measurement; the device includes a standing wave tube, a plurality of polyvinylidene fluoride piezoelectric films, a sensor, an exciter, a push-pull handle, an adjustable telescopic tube, a foamed lightweight soil detection material, a charge amplifier, a data memory, a data adapter, a signal generator, an adaptive power amplifier board, and a PC computer; the device of the invention has low cost, long service life, high measurement accuracy, relatively simple production process, and can be applied to different scenarios.

The invention provides a sleep physiological parameter real-time monitoring method based on flexible piezoelectric sensing, and relates to the technical field of biomedical signal processing.The method comprises the steps that a human body sleep biological mechanical signal is collected through a flexible piezoelectric sensor array, and after the signal is converted through a charge amplifier, phase-space reconstruction denoising and self-adaptive gain control are carried out; wherein the gain is dynamically adjusted based on the weight of the user, the rigidity coefficient of the mattress and the real-time signal amplitude; extracting heartbeat wave crest intervals, respiratory cycles and body movement frequency domain energy characteristics from the preprocessed signals; inputting the features into a cascaded convolutional neural network and a long-short-term memory network model, and synchronously outputting the heart rate, the respiration rate and the heart rate variability; in combination with the historical health data of the user and the cardiovascular health mapping model, sleep quality indexes and disease risk scores are generated through graph convolutional network analysis, and the monitoring frequency is dynamically adjusted and an apnea alarm is triggered.

The invention provides a design method of an adaptive signal conditioning system of a flexible gait sensor, and belongs to the technical field of flexible sensor signal conditioning. The method comprises the following steps: establishing a gait feature database by analyzing gait features in different states; obtaining design reference values of a gain G and a time constant according to stride frequencies and signal amplitudes of different gait states and requirements on dynamic response characteristics, and calculating corresponding accurate RC values under different gait states through mathematical relationships between the design reference values and capacitors and resistors in a charge amplifier and a low-pass filter circuit; carrying out simulation verification, and carrying out iterative optimization on the key parameters according to a result; designing a complete hardware system, and completing the design and layout of a PCB; and finally, circuit parameters are dynamically adjusted based on a pre-stored stride frequency RC mapping relation, and dynamic adaptive adjustment of the stride frequency is realized. According to the invention, high-precision conditioning output of mV-level weak signals is realized, the precision and stability of signal acquisition are remarkably improved, and the application scene of the system is expanded.

The application discloses a kind of multi-modal flexible sensor adaptive signal conditioning system design method, belong to flexible sensor signal conditioning technical field.The present application overcomes the defects of poor universality, performance compromise, high cost of mass production of existing conditioning circuit, adopts layered decoupling and dynamic reconstruction system-level architecture: through multi-modal feature analysis and demand mapping modeling, the feature vector composition of scene recognition is determined;Design configurable analog front end, integrate instrument amplifier, transimpedance amplifier, charge amplifier, bridge amplifier four parallel processing sub-modules, wherein charge and bridge amplifier adopt self-designed architecture with dynamic adaptive gain adjustment capability;Build heterogeneous digital processing platform with NPU, CPU, DSP as core, through cross-modal data fusion, scene recognition engine, dynamic hardware configuration combined with feedforward and feedback, loadable algorithm library and closed-loop optimization control law, realize the real-time scene reconstruction of hardware parameters and digital algorithm;Combined with domestic single-chip selection, rigid-flex PCB and automatic calibration, meet the demand of low-cost mass production.The present application realizes the native adaptation and performance optimization of single hardware platform to voltage, current, charge, impedance and other types of sensor signals, and can be widely applied in robot dexterous hand, medical monitoring, intelligent bandage, consumer motion monitoring and industrial monitoring fields.

The present invention discloses a multi-gain flat-panel detector and a reading data processing method, belonging to the field of image processing. The multi-gain flat-panel detector includes a scintillator layer and a reading circuit layer. Before reading, the reading circuit layer detects and corrects the signal and then outputs the image. Each pixel of the read image corresponds to its own independent thin-film transistor array, control circuit, and analog-to-digital converter, thereby achieving independent pixel reading. In addition, the overall capacitance of the charge amplifier can be adjusted by software control of the switching of the circuit containing the individual capacitors in the charge amplifier, thereby achieving control of the reading gain, solving the problems of data saturation and low data signal-to-noise ratio that are prone to occur in flat-panel detectors.

The present invention discloses a critical pressure testing system and method for detecting the entry of explosive combustion flames into gaps. The system comprises a main reaction device, a pressure testing unit, an ignition unit, and a photographic unit. The main reaction device comprises a reaction cell, a viewing window, and a gland. The pressure testing unit comprises a pressure sensor, a charge amplifier, and an oscilloscope. The ignition unit comprises an igniter, an optical fiber, and a laser. The photographic unit comprises a high-speed camera and a data collector. The testing unit also comprises a synchronous signal trigger for controlling the pressure testing unit and the photographic unit. The pressure testing unit and the ignition unit are both connected to the main reaction device, the photographic unit is connected to the synchronous signal trigger, and the pressure testing unit and the ignition unit are each connected to the synchronous signal trigger. The system and method provide a new option for distinguishing the safety of explosives with different formulas and can more accurately determine the relative accident risks of explosives with different formulas or storage periods.

The invention relates to the technical field of pipeline sealing monitoring, and relates to a signal conditioning circuit and a water supply pipe network leakage monitoring system, the signal conditioning circuit comprises an impedance matching module, a first charge amplifier and a frequency clamping module which are connected in sequence; the impedance matching module is in communication connection with a sensor used for collecting acoustic vibration signals of the water supply network; the input end of the impedance matching module is used for receiving an acoustic vibration signal; the frequency clamping module is used for limiting the amplitude of an interference sound wave signal; the interference sound wave signal is a sound wave signal beyond a frequency range corresponding to the acoustic vibration signal sent by a water supply network; according to the invention, acoustic vibration signals collected by the sensor can be filtered, amplified and subjected to frequency limiting processing, and the influence of interference acoustic signals on a water supply network leakage detection result is reduced.

The application provides an impact acceleration measurement method based on an impact acceleration measurement device, which comprises an impact wave generating device, a piezoelectric pressure sensor, a test block, a charge amplifier, a dynamic signal test collector, a microcomputer and a MATLAB simulation environment, and the measurement method comprises the following steps: step 1, determining the measurement point position of the measured equipment, and selecting the piezoelectric pressure sensor and the test block to be installed; step 2, applying impact charge to the measured equipment by using the impact wave generating device, testing, and collecting force signals; and step 3, calculating the time-domain acceleration according to the collected force signals, so that the application has the advantages of providing a device with simple structure, convenient operation and accurate impact acceleration measurement, and providing a measurement impact acceleration method with the advantages of eliminating low-frequency zero drift, not being controlled by frequency size and high testing precision.

The present invention discloses a piezoelectric pressure sensor based on an In2Se3 / InSe vertical heterojunction, and its preparation method and application, belonging to the technical field of sensor instrument construction. The present invention uses an In2Se3 / InSe vertical heterojunction thin film as a pressure-sensitive layer to prepare a piezoelectric pressure sensor. The stress change caused by the air pressure will change the energy band structure of the In2Se3 / InSe vertical heterojunction, thereby generating a piezoelectric voltage. This change can be monitored by detecting its voltage change through a charge amplifier, thereby achieving a highly sensitive response to tiny air pressure changes. The piezoelectric pressure sensor of the present invention is small in size and highly sensitive, providing a simple, sensitive and stable device and detection method for high-precision air pressure detection.

The invention relates to offset voltage cancellation for charge amplification circuits. A circuit includes an amplifier, a bias node, and a first set of switches configured to couple an amplifier input node to the bias node and a short-circuited amplifier output node based on an asserted first reset signal. Each of the first and second feedback branches includes a respective circuit network including a shunt capacitor, the first capacitor being directly connected to the amplifier input node. The first and second feedback branches further include a second set of switches intermediate the amplifier input node and the second capacitor, and a third set of switches intermediate the amplifier output node and the capacitor. The switches selectively couple the capacitors to the amplifier input and output nodes based on the asserted second reset signal. The time interval in which the second reset signal is asserted exceeds the time interval in which the first reset signal is asserted.

The utility model belongs to the technical field of charge signal processing, and particularly relates to a multiple-adjustable charge amplifier circuit, which comprises a low-pass filter circuit, an integral negative feedback amplification circuit, a high-pass filter circuit, a voltage amplification circuit and a double-T-shaped wave trap circuit, wherein the low-pass filter circuit is used for filtering a high-frequency signal of a charge signal; the integral negative feedback amplification circuit is used for converting the charge signal into a charge voltage signal; the high-pass filter circuit is used for filtering low-frequency signals; the voltage amplifying circuit is used for amplifying the charge voltage signal; the double-T-shaped wave trap circuit is used for filtering power frequency interference. The charge amplifier solves the problems that the amplification factor of the charge amplifier is adjustable, the impedance of the charge amplifier is large, and the charge amplifier is easily interfered by power frequency radiation or other noises.

The invention discloses a signal acquisition module based on adaptive polar zero cancellation. A signal processing unit comprises a digital polar zero cancellation module with Kalman filtering and a filtering forming module with template matching; the digital pole zero cancellation module with Kalman filtering is used for solving the problem of digital pole zero cancellation digital coefficient mismatch caused by temperature excursion of the front-end analog charge amplifier module, and the problem of digital pole zero cancellation digital coefficient mismatch refers to voltage overcompensation and voltage undercompensation caused by suppression of pole zero point mismatch; the filter forming module with template matching is used for solving the problem of waveform accumulation in digital filter forming after digital pole zero cancellation. Based on the self-adaptive pole-zero cancellation signal acquisition module, key technologies such as Kalman filtering and template matching are fused, the limitations of traditional nuclear pulse digital processing in the aspects of temperature drift adaptability, anti-accumulation performance, time extraction precision and the like are effectively overcome, and the comprehensive performance of the system is remarkably improved.

The invention relates to the field of charge amplifiers, in particular to a multi-gear multi-channel charge amplification device for a differential three-dimensional force detection mechanism. A multi-gear multi-channel charge amplification device for a differential three-dimensional force detection mechanism comprises a charge amplifier integrated circuit board electrically connected with the differential three-dimensional force detection mechanism, and the charge amplifier integrated circuit board is provided with a charge signal input interface, a power supply interface and at least three multi-gear charge amplifier units. The multi-gear charge amplifier unit comprises a precision operational amplifier chip and n adjustable amplification gears, and the on-off states of n feedback capacitors are switched through a 2n-bit patch dial switch to achieve gear switching. The method has the advantage of being higher in universality, can be used for cutting machining of various products, meets the requirements of different measurement ranges, and does not need to additionally add signal debugging equipment.

According to one embodiment, a sensor includes an element section and a circuit section. The element section includes a base including a base face, a fixed portion fixed to the base face, a movable portion supported by the fixed portion, a first gap being provided between the base face and the movable portion, and a plurality of fixed electrodes fixed to the base face and facing the movable portion. The plurality of fixed electrodes includes a first electrode and a second electrode. A first direction from the fixed portion to the first electrode is along a first plane along the base face. A second direction from the fixed portion to the second electrode is along the first plane and is inclined with respect to the first direction. The circuit section includes a first charge amplifier and a second charge amplifier.

A capacitive sensing charge amplifier, e.g., in a direct current (DC) feedback network, may incorporate a switching capacitor, including a first control switch and a second control switch, which receives a switching signal to charge and discharges the switching signal to a virtual ground of a sense amplifier. Noise incorporated into the output of the sense amplifier (e.g., a MEMS output signal) is filtered by a demodulation signal at a demodulator such that the period average noise at the demodulator output equals zero. The time varying nature of the switching capacitor resistance generally reshapes the system's post-demodulation noise to reduce its low frequency output noise.

The application provides a MEMS gyroscope, which comprises a MEMS inertial sensing part, a gyroscope interface circuit, wherein the MEMS inertial sensing part comprises a driving capacitor group, a driving detection capacitor group and a detection capacitor group of one or more axes; the gyroscope interface circuit comprises a driving circuit, a detection circuit of one or more axes, a correction capacitor group of one or more axes and a digital processing circuit; the driving circuit comprises a driving charge amplifier, the detection circuit comprises a detection charge amplifier of one or more axes, one end of a first correction capacitor in the correction capacitor group of each axis is connected to a first output end of the driving charge amplifier, the other end is connected to a first input end of the detection charge amplifier of the corresponding axis, one end of a second correction capacitor in the correction capacitor group of each axis is connected to a second output end of the driving charge amplifier, and the other end is connected to a second input end of the detection charge amplifier of the corresponding axis. In this way, the quadrature error can be eliminated, and the gyroscope zero bias stability and noise level are improved.

The embodiment of the present application relates to a kind of single-ended conversion differential capacitor sampling compensation device and sampling compensation method, the device includes: compensation module, at least including one compensation capacitor;The compensation module is connected with the capacitor to be measured, for compensating the reference value of the capacitor to be measured;Sampling amplification module, at least including one charge amplifier and feedback capacitor;The sampling amplification module is connected with the capacitor to be measured and compensation module, for converting the capacitance value of the capacitor to be measured into differential voltage value output, to obtain the capacitance value of the capacitor to be measured.The technical scheme of the embodiment of the present application realizes the operation of single-ended conversion differential with one single-ended circuit.Due to the fact that a pseudo branch can be saved, this structure reduces the area of chip when applied in the scenario of large measured capacitor;And due to the innovation of sampling mode between different working phases, it is realized that the standard value of large measured capacitor can be offset with smaller compensation capacitor.

This invention relates to an impact-type Brazilian rock splitting and in-situ observation experimental apparatus and method, comprising a frame, lifting mechanism, impact hammer, spring, externally threaded iron bar, synchronous motor, upper vise, lower vise, piezoelectric force sensor, charge amplifier, computer, CT scanning device, infrared heater, infrared thermometer, inlet valve, outlet valve, and gas cylinder. The piezoelectric force sensor is connected to the computer via the charge amplifier for real-time acquisition, recording, and analysis of dynamic load signals during the splitting process. The chamber integrates a miniature CT scanning device, infrared heating and temperature measurement device, and protective atmosphere pipeline, enabling in-situ, non-destructive scanning imaging of rock samples before and after the experiment under controlled conditions. This invention obtains dynamic mechanical parameters and failure evolution images of rocks while efficiently and stably splitting rock cores, providing an integrated scientific research device for studying the dynamic failure mechanism of rocks under complex conditions, combining efficient loading, environmental simulation, and real-time observation.

The invention belongs to the technical field of nuclear power station instrument control systems, and particularly relates to a nuclear power station loose part monitoring system charge amplifier which is characterized in that the input end of a voltage-stabilized power supply circuit is connected with an LPMS system; the first input end of the overvoltage protection circuit is connected with the output end of the vibration accelerometer, and the second input end of the overvoltage protection circuit is connected with the output end of the stabilized power supply circuit; the input end of the differential charge amplification circuit is connected with the output end of the overvoltage protection circuit; the input end of the bandwidth adjusting circuit is connected with the output end of the differential charge amplifying circuit; the input end of the secondary amplifying circuit is connected with the output end of the bandwidth adjusting circuit; the input end of the output power driving circuit is connected with the output end of the secondary amplifying circuit, and the output end of the output power driving circuit is connected with the LPMS; the self-checking circuit is controlled by the LPMS, the input end of the self-checking circuit is connected with the LPMS, and the output end of the self-checking circuit is connected with the bandwidth adjusting circuit. According to the invention, reliable voltage signals can be provided for the loose part monitoring system cabinet.

The invention provides a data acquisition system based on an STM32H750 microcontroller, and relates to the technical field of sensor signal processing and communication. The system comprises a piezoelectric sensor, a charge amplification module, an analog-to-digital conversion module, a main control module and a communication module, the piezoelectric sensor is used for carrying out dynamic pressure measurement and collecting a charge signal; the charge amplification module is used for converting the charge signal acquired by the piezoelectric sensor into a voltage signal; the analog-to-digital conversion module is used for carrying out analog-to-digital conversion on the acquired voltage signal and then converting the voltage signal into digital voltage; and the main control module is used for carrying out FIR or IIR filtering on the converted digital voltage based on the STM32H750 microcontroller, carrying out threshold value judgment on the range of the acquired digital voltage, and carrying out zero clearing and resetting processing by using the charge amplification module if the range exceeds the threshold value range. According to the system, the high-precision and low-noise charge amplification module is designed, and the real-time processing capability of the STM32H750 microcontroller and the TCP / IP communication protocol are combined, so that accurate acquisition, processing and remote transmission of piezoelectric sensor signals are realized.

A readout circuit for a high-precision vibration sensor comprises an on-chip self-test circuit, a low-noise charge amplifier, a correlated double sampling circuit, a PID feedback control circuit, a phase compensation circuit and Sigma-Delta. A self-test signal is amplified by the low-noise charge amplifier, low-frequency noise and offsets are filtered out by the correlated double sampling circuit, then a self-test path and a working path of a vibration sensor are separated in the time domain by the PID feedback control circuit, the phase compensation circuit performs zero compensation and pole compensation on the signal, and Sigma-Delta converts an analog signal into a high-precision digital signal.

This application provides a signal processing circuit and an electronic device. The signal processing circuit includes: a charge amplifier circuit for receiving a differential charge signal output from a sensor; amplifying and converting the differential charge signal to output a first voltage signal; a non-inverting amplifier circuit connected to the charge amplifier circuit for receiving the first voltage signal; amplifying the first voltage signal to output a second voltage signal; a voltage-controlled filter circuit connected to the non-inverting amplifier circuit for receiving the second voltage signal; amplifying and filtering the second voltage signal to output a third voltage signal; and a hysteresis comparator circuit connected to the voltage-controlled filter circuit for receiving the third voltage signal and comparing it to obtain a stable square wave signal. The solution provided in this application can effectively suppress common-mode noise signals, has a fast response speed, is less affected by circuit impedance, and produces a better square wave signal output.

This invention discloses an ultra-high frequency control system and method for piezoelectric stack actuators. The system includes a LabVIEW-based high sampling rate drive control system and a charge amplifier. The LabVIEW-based high sampling rate drive control system generates drive signals for the piezoelectric stack actuator, acquires displacement signals of the piezoelectric stack actuator, and processes the acquired displacement signals and drive signals to obtain control signals for the piezoelectric stack actuator. The control signals are output to the charge amplifier, which receives and amplifies the control signals. The amplified control signals are then sent to the piezoelectric stack actuator. This invention achieves high-precision trajectory tracking of the piezoelectric actuator at high operating frequencies, with tracking errors reaching the tens of nanometers level under high-frequency operating conditions.

A device and method for representing the foam porosity state of foamed lightweight soil with self-adjusting beams, and relates to the technical field of sound absorption coefficients measurement; the device includes a standing wave tube, a plurality of polyvinylidene fluoride piezoelectric films, a sensor, an exciter, a push-pull handle, an adjustable telescopic tube, a foamed lightweight soil detection material, a charge amplifier, a data memory, a data adapter, a signal generator, an adaptive power amplifier board, and a PC computer; the device of the invention has low cost, long service life, high measurement accuracy, relatively simple production process, and can be applied to different scenarios.

The invention discloses a charge amplifier, and belongs to the technical field of electronic measurement. The amplifier comprises an input adaptive module, a charge-voltage conversion module, a temperature compensation module, a signal amplification filtering module, an output driving module and a high-temperature stable power supply module, and the input adaptive module is connected with a high-temperature piezoelectric sensor adopting a bismuth layered structure ceramic or lithium niobate ceramic formula; and the device can stably work in an extreme high-temperature environment of-55 DEG C to 550 DEG C. A high-temperature resistant material system is adopted, a temperature compensation module is additionally arranged, and shielding and filtering design is optimized, so that the problems of failure, signal drifting and weak anti-interference capability of an existing charge amplifier in a high-temperature environment are solved. The amplifier is high in signal conversion precision (the nonlinear error is smaller than or equal to + / -0.5% FS), adjustable in gain and filtering parameters, excellent in protection performance and capable of being matched with high-temperature piezoelectric sensors of different specifications, is widely applied to extreme working condition vibration monitoring in the fields of aerospace, energy power, petroleum and natural gas and the like, and provides reliable data support for equipment fault early warning and service life evaluation.

The present invention discloses a test system and method for quickly identifying a boring stiffness coefficient. The system comprises an excitation module, a force measurement module, and a displacement measurement module. The excitation module comprises a test computer, a signal generator, a power amplifier, a contact electromagnetic exciter, and an air-cooled air pump. The force measurement module comprises a pressure-variable force sensor, a charge amplifier, a force signal acquisition box, and a test computer. The pressure-variable force sensor is installed between a workbench and a workpiece to be measured, the output end of the pressure-variable force sensor is connected to the input end of the charge amplifier via a connecting line, the output end of the charge amplifier is connected to the input end of the force signal acquisition box via a connecting line, and the output end of the force signal acquisition box is connected to the test computer via a USB interface. The displacement measurement module comprises an eddy current displacement sensor, a displacement signal acquisition box, and a test computer. Three eddy current displacement sensors are respectively installed at a measured point on the end of the workpiece to be measured, a front end of a boring tool, and a root of the boring tool.

The application provides a wide-range quasi-static six-dimensional force measuring device for a spacecraft, comprising four force sensors, a set of upper and lower mounting plates, a charge amplifier and a data acquisition instrument, the four force sensors are installed between the upper mounting plate and the lower mounting plate and are distributed in a rectangular diagonal manner, the force sensors are connected with the charge amplifier, the charge amplifier outputs three-axis resultant force and resultant moment to the data acquisition instrument according to the measurement signals of the force sensors; the charge amplifier is a Kistler multi-channel signal conditioner, which is specifically used for calculating and outputting corresponding resultant force and resultant moment according to the measurement signals input by the force sensors. In this way, the application realizes wide-range wide-band quasi-static force measurement of the spacecraft, can obtain interface force and moment information at the connecting point of the spacecraft, has the advantages of wide test frequency band, high eccentricity test precision and low cost.

This invention discloses a static calibration method for a piezoelectric force sensor. The method involves sequentially applying multiple predetermined force levels to the piezoelectric force sensor; continuously acquiring the sensor output signal after conversion by a charge amplifier during and before and after the holding phase of each force level; selecting at least four time points from the acquired output signal time series after completing one loading and unloading cycle of force levels; constructing calibration values ​​based on the output signals corresponding to the four time points; unloading the piezoelectric force sensor to a zero-load state and performing zero-point calibration after the holding phase; and establishing a calibration relationship between force and output signal based on the calibration values ​​corresponding to each predetermined force level. This method does not require modeling the charge amplifier drift mechanism and does not rely on a low-drift, high-performance charge amplifier, effectively suppressing calibration errors caused by charge amplifier drift during the holding phase, reducing calibration system costs, and improving calibration accuracy.