45 results about "Charge amplifier" patented technology

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 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 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 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.

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 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.

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 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.

The invention discloses a temperature response testing device and method for a piezoelectric vibration sensor, and belongs to the technical field of piezoelectric vibration sensor testing, and the temperature response testing device comprises a sine acceleration vibration exciter, a testing base, a charge amplifier and the piezoelectric vibration sensor. The sine acceleration vibration exciter is fixedly connected with the test base, and at least one piezoelectric vibration sensor with the same or different configuration is fixed on the test base; the piezoelectric vibration sensor and the test base are respectively connected with the charge amplifier; a sensor mounting test surface is arranged on the test base, a sensor clamp is fixed on the sensor mounting test surface, and the sensor clamp is provided with a plurality of mounting apertures so as to adapt to the mounting of a large number of piezoelectric vibration sensors with different configurations. The device is easy to operate and high in testing efficiency, the technical problem of testing one piezoelectric vibration sensor with a single diameter at a time in the prior art is solved, and a new method and approach are provided for testing the temperature response of the piezoelectric vibration sensor.

The invention discloses a piezoelectric actuator displacement self-sensing device and method based on total charge, and belongs to the field of micro-nano positioning and intelligent sensing. The device comprises a driving circuit, a protection circuit and a measuring circuit, a capacitance voltage dividing structure is combined with a coupling type charge amplifier, displacement sensing is achieved by measuring the total charge flowing to a piezoelectric actuator, capacitance parameters meet the condition that Cc < Cp < Cr, and the cost is remarkably reduced while the measuring precision is guaranteed. According to the method, an extended piezoelectric constitutive equation is provided, a displacement self-sensing model with a clear structure and controllable parameters is established, model simplification according to precision requirements is supported, and high-precision and high-timeliness real-time displacement estimation is realized. The method solves the problems of complex model, large calculation amount, high charge measurement cost and easy drifting in the prior art, and is suitable for the fields of micro-nano control, precise positioning, vibration suppression and the like.

The application discloses a kind of based on sampling capacitor multiplexing boost amplifier's boost circuit, including boost amplifier, sampling capacitor, flying capacitor, feedback resistance and switch network.Wherein, boost amplifier is used to output boost voltage to flying capacitor, sampling capacitor is used to sample the boost voltage output by boost amplifier, flying capacitor is used to carry out periodic charge and discharge to keep the constant of boost circuit output voltage, feedback resistance is used to carry out feedback sampling to boost circuit output voltage;Switch network has multiple designs, and can switch the working mode of boost circuit.The application samples the boost voltage of boost amplifier at the previous moment by sampling capacitor, and uses the same boost amplifier to charge flying capacitor to the potential of the boost voltage at the previous moment using sampling capacitor at the next moment, which can save the use of charging amplifier, while improving the overall resource utilization of the circuit.

The utility model relates to the technical field of circuit design, in particular to an IEPE circuit based on a charge amplifier, which comprises a piezoelectric component, an input network, a voltage type amplifier, a feedback network and a constant current source circuit, the voltage component is connected in series with the voltage type amplifier, the input network is connected in parallel with the voltage component, and the feedback network is connected in parallel with the constant current source circuit. The feedback network is connected with the voltage type amplifier in parallel, the constant current source circuit is connected with the voltage type amplifier in series, the charge amplifier design is adopted, charge signals generated by the piezoelectric assembly are directly processed, the problem that low-frequency signals are insufficiently amplified in the traditional voltage type design is solved, and the low-frequency signal amplification efficiency is improved. Therefore, the sensitivity and the accuracy of the sensor in low-frequency vibration measurement are remarkably improved.

Detection circuit (1) and method for detecting connection defects of an electrical connection between capacitive sensor electrodes (7A, 7B) and a signal input (4A) of a charge amplifier (4) with a signal generator (2) for generating a signal which is applied as a common-mode signal to the signal input (4A) of the differential charge amplifier (4) via a common-mode regulator (3), the analog output signal of which is converted into a digital output signal by a differential analog-to-digital converter (5); and with an evaluation unit (6) which is designed to evaluate the digital output signal of the analog-to-digital converter (5) for detecting connection defects of the electrical connection between the capacitive sensor electrodes (7A, 7B) and the signal input (4A) of the charge amplifier (4).

The application relates to a mass spectrometer based on mirror charge signal detection, comprising an electrostatic ion trap, the electrostatic ion trap comprising an electrode group for defining a boundary potential to generate an electrostatic field, the electrode group comprising a plurality of electrodes, at least two electrodes in the electrode group serving as mirror charge pickup electrodes, the mirror charge pickup electrodes being connected through a capacitor, one of the mirror charge pickup electrodes being connected with a mirror charge amplifier, and each mirror charge pickup electrode being electrically connected with a resistor and then with a direct current power supply; the application connects the direct current power supply with each mirror charge pickup electrode to electrify the mirror charge pickup electrode to meet the conditions for mass spectrum analysis of ions in the ion trap, and connects the mirror charge pickup electrodes through a capacitor to combine the mirror charge signals picked up by the plurality of mirror charge pickup electrodes and send the signals to a mirror charge amplifier for amplification and detection, so that the number of mirror charge amplifiers is reduced, and noise signals are reduced.

Seismocardiographic reading device (120) comprising: - two charge amplifiers (210, 220) configured to receive an input from an accelerometer (110) and each to generate a first output signal, wherein the accelerometer (110) comprises two mechanical capacitors connected in series, the mechanical capacitors changing their capacitance according to acceleration pulses, wherein two feedback loops via respective switches (330, 340) in the reading device are connected via a differential amplifier, and - the differential amplifier (230) configured to receive the first output signals and amplify a difference between the first output signals to generate two second output signals, wherein, when the switches (330, 340) are open, a resistance of the switches (330,340) in the locked state, a resistance feedback is suppressed and an active high-pass filter functionality is generated, wherein the active high-pass filter functionality suppresses a constant acceleration component in the input from the accelerometer (110).

The invention discloses a piezoelectric ceramic static force detection device and electronic equipment. The piezoelectric ceramic static force detection device comprises a charge amplifier, a processing unit, a piezoelectric sensor and a first reference voltage end, wherein the piezoelectric sensor is used for detecting a differential electric signal generated when a pressing area of the touch panel is pressed by static force and inputting the differential electric signal to the charge amplifier; the charge amplifier is used for outputting an output voltage corresponding to a static force when receiving the differential electric signal; the processing unit is used for detecting the output voltage of the charge amplifier and outputting a reset signal to the charge amplifier when detecting that the output voltage is lower than a bias voltage; the charge amplifier further comprises a reset circuit, and the reset circuit is electrically connected with the processing unit and used for recovering the output voltage to the bias voltage when receiving the reset signal. Therefore, the charge amplifier can be prevented from generating noise in the actual working process to influence the measurement result of the piezoelectric sensor.

Provided is an input device capable of measuring a strain-based load and capacitance using one measurement circuit. This input device is provided with: a load sensor having a first voltage division circuit that connects a first strain sensor and a second strain sensor, an electrostatic sensor, and a measurement circuit; one end of the first capacitor is connected to a connection point of the first strain sensor and the second strain sensor; the second voltage division circuit is used for connecting the third strain sensor with the fourth strain sensor; and a second capacitor, one end of which is connected to a connection point between the third strain sensor and the fourth strain sensor, the electrostatic sensor having a plurality of electrostatic sensor electrodes. Applying an AC voltage to the first voltage division circuit, the second voltage division circuit and the electrostatic sensor electrode; a charge amplifier provided at a subsequent stage of each of the first capacitor, the second capacitor, and the plurality of electrostatic sensor electrodes; and a control circuit that calculates a measured value on the basis of the output of the charge amplifier.

The invention relates to the field of gear grinding machining, in particular to a compact type automatic gear grinding machining energy-saving special device which comprises a machining bottom plate, and a grinding assembly is installed on the edge of the top of the machining bottom plate; cutting force generated by the grinding wheel structure can be directly transmitted to the piezoelectric sensor, the piezoelectric sensor can capture high-frequency vibration signals generated when the grinding wheel makes contact with a gear, the high-frequency vibration signals are converted into electric signals through the charge amplifier, grinding force fluctuation is reflected in real time, and when the grinding force is increased abnormally, the rotating speed is automatically increased; then the distance of the grinding wheel structure is monitored through a plurality of sets of distance sensors to observe whether the distances between the grinding wheel structure and all meshing parts of the gear are located at the same numerical value or not, noise monitoring is conducted through a noise sensor, and the grinding end is monitored while abnormal sound of the grinding wheel structure is monitored; the precision of a gear grinding finished product is improved, meanwhile, the machining monitoring effect is improved, and the energy-saving special working effect is improved.

The present invention discloses an electro-vibration coupled stress relief system, comprising a host computer, an arbitrary waveform card, a power amplifier, an electromagnetic exciter, an energy amplification device, an acceleration sensor, a charge amplifier, an oscilloscope, a power module, a charging module, an electric energy storage module, a discharge module, a pulse current sampling measurement module and a copper electrode. The present invention also discloses a method for eliminating residual stress, comprising the following steps: obtaining the natural frequencies of bending vibration of different orders by numerical modal analysis; fixing the metal structure; discharging the metal structure to generate high-energy electrical pulses by opening the charging switch and closing the discharge switch; inputting the analog excitation signal output by the arbitrary waveform card into the electromagnetic exciter via the power amplifier and driving the electromagnetic exciter to generate high-frequency vibration.

The application discloses a machine tool linear shaft dynamic characteristic testing device based on three-direction servo vibration excitation, which comprises a base, a measured screw guide rail pair, a movable and liftable gantry support, a longitudinal and transverse vibration excitation device, a driving execution device and an experiment collection device. The bridge plate is installed on the measured guide rail through a sliding block, the gantry support is connected with the base through a support sliding rail, and synchronous movement with the bridge plate is realized by driving the motor. The longitudinal vibration exciter is hung on the main beam U-shaped lug, and the transverse vibration exciter is hung on the triangular support on the side of the column, so that three-direction servo vibration excitation in the normal direction, the transverse direction and the axial direction is realized. The numerical control system controls the synchronous work of the three motors, the acceleration sensor and the impedance head collect signals, the signals are transmitted to a computer for analysis and processing through a charge amplifier and a data acquisition card. The application can realize synchronous movement of the vibration exciter and the measured component, meets various dynamic characteristic testing requirements, and is suitable for stiffness and damping characteristic identification of the guide rail sliding block and the screw rolling joint surface.

This invention relates to the field of sleep bed technology and proposes a piezoelectric sensing-based adjustable sleep bed, including a bed frame assembly comprising a base and a support assembly disposed above the base; the support assembly contains multiple airbags and integrates a piezoelectric sensor for collecting human vital signs data; a control assembly, either separate from or integrated with the bed frame assembly, utilizes the piezoelectric sensor and airbags to dynamically convert the pressure of the human torso, waist, and legs into electrical signals when lying down. After being processed by a charge amplifier and the main control board, the control unit controls the negative pressure regulating box to independently inflate or deflate the corresponding airbags, thereby changing the support firmness of each area in real time. This allows the bed surface to actively conform to the physiological curvature of the human body and evenly distribute body pressure, avoiding poor blood circulation caused by concentrated local pressure, significantly improving sleep comfort, and solving the problems of insufficient comfort and intelligence in existing technologies.

The application discloses a kind of based on PLC's curved element array control system and control method thereof.The system is composed of model box, curved element sensor array, array control system and driving and acquisition system four parts.Curved element sensor array includes shock isolation pad, curved element support, excitation element, receiving element and the like structure;Array control system includes PLC, button control panel, first wiring terminal plate, second wiring terminal plate, third wiring terminal plate, fourth wiring terminal plate and the like component;Driving and acquisition system includes signal generator, power amplifier, oscilloscope, charge amplifier, host computer and the like component.The application is based on PLC controller control circuit switching work curved element, realizes the control that multiple pairs of curved element respectively generates excitation wave and accepts vibration signal under single channel condition, so that curved element sensor array can efficiently, low cost complete scanning to target soil space, obtains the three-dimensional shear wave velocity distribution mode of soil space.