76results about How to "Wide frequency response range" patented technology

The invention relates to an audio signal processing method and an audio signal processing device for restoring a signal under speaker cut-off frequency to the original sound, which aim to extend the equivalent sound range of a small-sized speaker and enhance the expression of low sound. A virtual low-sound harmonic wave sequence is generated by a feedforward self-multiplication operation method and singly by the grain corresponding to each harmonic wave respectively, so that the proportion of the harmonic waves can be freely controlled and the tone can be controlled; the gain applied to the virtual low-sound signal is adjusted by a virtual low-sound signal sound-type control method and according to the impacting process and the releasing process to control the sound types of the virtual low-sound signal so as to control the hearing feeling of the final sound signal according to requirements to make the sound from 'knocking' more abundant; and the virtual low-sound signal processing effect is enhanced by combining techniques such as a low-sound dynamic range compression technique, a power conservation filter technique, a low-sound signal frequency redivision technique and the like, even if under high speaker cut-off frequency, the quality of the original low sound can still be restored by effectively restoring the virtual low-sound signal.

A pulse-taking signal sensor probe comprises a base, as well as a rotary shaft support seat and an elastic beam arranged on the base, wherein a shaft hole and a rotary shaft arranged in the shaft hole are arranged on the rotary shaft, the middle part of a linkage piece is hinged on the rotary shaft support seat by the rotary shaft and can pivot by surrounding the rotary shaft, the linkage piece comprises two parts, namely a horizontal arm and a longitudinal arm, one end of the horizontal arm is connected with the lower end of the longitudinal arm together, one end of an optical fiber bragg grating is fixed on the upper end of longitudinal arm, the other end of the optical fiber bragg grating is fixed at the top end of an elastic beam; and the probe is arranged at the other end of the horizontal arm of the linkage piece and passes through a through formed in the base and extend outside the base. An optical fiber pulse-taking signal sensor acquisition system comprises a broadband light source with optical fiber coupling output, and a spectral measurement instrument, which are simultaneously connected with one side of an optical fiber coupler, the other side of the optical fiber coupler is connected with the pulse-taking signal sensor probe by optical fiber, and the spectral measurement instrument is electrically connected with a computer.

T-coil structures are used in one embodiment to inject programmably-variable amounts of transistor biasing currents into the respective drains of current sinking transistor means of a broadband differential amplifier such that, when the differential amplifier is in common mode, total transistor drain current will exceed total voltage-dropping current passing through corresponding voltage-dropping resistances of the amplifier's transistor means. The T-coil structures keep the parasitic capacitances of the programmable current sources that provide the bias currents de-lumped from capacitances of the amplifier's output nodes and / or capacitances of the amplifier's voltage-dropping resistances (variable resistances) to thereby maintain a wide bandwidth.

The invention discloses a full-tensor magnetic field gradiometer based on the giant magnetic impedance effect. The full-tensor magnetic field gradiometer comprises an X-Y-direction gradiometer body, a Z-direction gradiometer body and signal leads. The X-Y-direction gradiometer body comprises a cross-shaped substrate and a giant magnetic impedance thin film, the Z-direction gradiometer body comprises a rectangular substrate and a giant magnetic impedance thin film, a junction point at the input end and a junction point at the output end of an electric bridge are connected with the signal leads, and the signal leads are arrayed symmetric with the geometric center of the whole gradiometer as the three-dimensional center. The full-tensor magnetic field gradiometer has the advantages of being high in accuracy, minimized, low in cost, wide in frequency response, rich in information and the like. Due to the design of preparing a three-dimensional structure through planar thin films, the problem of space consistency of the full-tensor magnetic field gradiometer based on the giant magnetic impedance thin films is solved, and the magnetic field gradient measuring sensor with the size at the chip level is designed for the first time.

The invention relates to an L-beam piezoresistance type micro-accelerometer and a production method thereof, the micro-accelerometer comprises a supporting main framework body, an elastic beam, a weight block, cover plates and so on, which is characterized in that the elastic beam is shaped like L, a long arm of the L-shaped elastic beam is connected with a side frame of the supporting main framework body, the weight block is suspended in the middle of a supporting side frame body by the support of the L-shaped elastic beam, a short arm of the L-shaped elastic beam is connected with the top angle of the upper surface of the weight block; the upper and the lower surfaces of the supporting main framework body are bonded with the cover plates; the root part and the top end of the long arm of the L-shaped beam are respectively provided with a piezoresistor, and the two piezoresistors with the same resistance on the L-shaped beam constitute a bridge with the unilateral strain of a Wheatstone bridge. The micro-electron mechanical processing technology is adopted as the key production technology. The L-beam piezoresistance type micro-accelerometer can solve the problem that the existing piezoresistance type micro-accelerometer can not simultaneously meet the requirements of high sensitivity, small volume, low cost, small cross-interference and easy processing.

A current measuring method includes utilizing current magnetic field sensing probe formed by piezoelectric ceramic and amorphous alloy to convert current linear magnetic field to be voltage analog signal and sending it to electrooptical converting element where converts electrooptical analog signal to be analog light signal and sends it to earth potential side, converting said light signal to be analog electric signal and converting this electric signal to be digital signal by A / D converter for outputting. The electrical current mutual inductor of the method is also disclosed.

The invention discloses a high-frequency vibration distributed optical fiber sensing system based on random sampling. The system comprises a laser device, an intensity modulator, a circulator and a detector. The laser device is used for producing continuous laser signals. The intensity modulator is used for receiving the laser signals and modulating the laser signals into random pulsed light. The first end of the circulator is used for receiving the random pulsed light, the second end of the circulator is used for injecting the random pulsed light into a sensing optical fiber and receiving Rayleigh scattering light transmitted reversely in the sensing optical fiber, and the third end of the circulator is sued for outputting the Rayleigh scattering light. The detector is used for converting the Rayleigh scattering light into electric signals. The system can greatly widen the frequency response range, the vibration frequency response range is not limited by sensing distance, high-frequency vibration is facilitated, and particularly wide-spectrum vibration with the frequency sparse characteristic is effectively detected.

The invention discloses a broadband high-voltage intelligent resistive electric current sensor, which comprises the following components: a current diverter (1) for extracting voltage signal from a detected current circuit, a high-voltage side signal processing device (2) for converting an analog voltage signal output from the current diverter (1) to a digital signal and performing arithmetic processing, a communication optical fiber assembly (5) connected with the high-voltage side signal processing device (2) and a low-voltage side digital display terminal (6), a high-voltage side power supply (3) for supplying working power supply to the high-voltage side signal processing device (2), and a high-voltage isolation transformer (4) connected with the high-voltage side power supply (3) and a low-voltage side power supply electric network. The invention has the advantages of wide frequency response, alternating current / direct current universality, wide effective measurement range, no saturation magnetization problem, high measurement accuracy, high withstand voltage, high linearity, low temperature drift, easy calibration, high resistance to jamming, and no high-voltage risk of secondary circuit opening; The invention is suitable for motor production enterprises, motor research and detection centers.

The invention discloses a pressure sensor and a non-invasive continuous blood pressure monitoring device and system. A first electrode layer, a first friction layer, a second friction layer and a protecting layer are sequentially arranged; the first and second friction layers are prepared by adopting materials with different triboelectricity properties, so that one loses electrons and the other one acquire the electrons in the contacting process of the first and second friction layers; the second friction layer is prepared by the weaving of multiple weaving strips; a clearance is reserved between the second and the first friction layers, and the second friction layer can generate deformation to be in contact with the first friction layer when external pressure vibration towards the first friction layer is borne by the second friction layer; the clearance between the second and the first friction layers can be automatically adjusted along with external pressure when the external pressure vibration diminishes or stopped. The pressure sensor and the non-invasive continuous blood pressure monitoring device and system have the advantages that faint pulse vibration signals with differentfrequencies can be detected, and self-powered sensor pulse monitoring and non-invasive sleeve-band-pressure-free blood pressure monitoring can be achieved.

The invention discloses an intelligent spherical aggregate for concrete structure health monitoring. As the size of a sensor is close to a coarse aggregate generally added in a concrete material, and meanwhile the sensor has a function of monitoring the health condition of a concrete building structure, the sensor can be called as the intelligent aggregate. The main body of the intelligent aggregate comprises a hollow spherical composite material particle, positive and negative electrodes, a packaging structure and a cable or a mini wireless transceiver, wherein the hollow spherical composite material particle is formed by compositing a PZT piezoelectric ceramic particle, cement powder, epoxy resin and the like; the positive and negative electrodes are formed at the inner and outer surfaces of the composite material particle; the packaging structure is packaged outside the composite material particle and is provided with an electromagnetic shielding layer; the cable or the mini wireless transceiver is connected with the positive and negative electrodes and the electromagnetic shielding layer. The intelligent aggregate can be buried in concrete in the construction process of the building structure to realize the long-term concrete structure health monitoring.

The invention discloses a broadband high-voltage intelligent resistance voltage-division voltage sensor, which consists of the following components: a resistance type voltage divider (1) used to pick voltage signal from a measured voltage circuit, a high-voltage side signal processing device (2) used to convert the analog voltage signal output from the resistance type voltage divider (1) into digital signal and carry out operation processing, a set of communication optical fibers (5) connecting the high-voltage side signal processing device (2) and a low-voltage side digital display terminal (6), a high-voltage side electric source (3) providing working electric source for the high-voltage side signal processing device (2) and a high-voltage isolating transformer (4) connecting the high-voltage side electric source (3) and a low-voltage side power supply electric network. The broadband high-voltage intelligent resistance voltage-division voltage sensor has wide frequency response scope, AC / DC commonality, wide effective testing scope, no magnetic saturation problem, high measuring precision, high voltage resistance, high linearity, low temperature drift, easy calibration and strong anti-interference capability, and is suitable to be used in places such as an electric motor manufacturing enterprise and an electric motor research and detection center, etc.

The invention belongs to the technical field of optical fiber sensing, and particularly relates to a distributed sensing system based on a Michelson-Sagnac optical fiber interferometer. According to the system, two arms of a Michelson optical fiber interferometer are used as sensing arms, and the two sensing arms are distinguished through adoption of a signal analysis algorithm; and the two interferometers detect the same time-varying disturbance at the same time, add and subtract the demodulated phases to obtain two paths of signals with time delay, and obtain the time delay related to the disturbance position through cross-correlation, so that the disturbance position information can be calculated. The maximum detection distance of the system can reach 140 km, and no blind area exists. According to the system provided by the invention, the Michelson-Sagnac hybrid optical fiber interferometer is utilized to realize distributed optical fiber sensing and positioning, the sensitivity andpositioning precision of long-distance distributed sensing are improved, the frequency response range of a distributed optical fiber sensing system is expanded, and the problem that positioning cannot be achieved when a traditional scheme is applied to buried optical cable positioning is solved.

The invention relates to a passive electronic voltage transformer, and belongs to the technical field of electronic voltage transformers. The passive electronic voltage transformer comprises a capacitive voltage divider, an all-fiber current transformer and a data processing unit, and the all-fiber current transformer is used to the leakage current of the capacitive voltage divider and indirectly detect the voltage. The passive electronic voltage transformer can effectively overcome defects of a present electronic voltage transformer, power supply is not needed in the high-tension side, the problem of magnetic saturation does not exist, and the passive electronic voltage transformer also has the advantages including low cost, high response speed, high measuring linearity, wide measuring dynamic range, high measuring precision, high transient performance, high reliability and high stability.

The invention discloses a phase sensitive light time domain reflection system based on dual homologous heterodyne coherent detection, and the system consists of a laser, a coupler, an AOM (acoustic optical modulator), an EOM (electro-optic modulator), an erbium-doped optical fiber amplifier, a filter, a circulator, balance detectors, power dividers, and a data collection card. The balance detector 1 enables the beat frequency signals of received modulated light and local oscillation light to be converted into AC signals, and the balance detector 2 enables the beat frequency signals of received Rayleigh light and local oscillation light to be converted into AC signals, wherein the frequency mixing of the AC signals is carried out through the power dividers 1 and 2, and the outputted AC signals are converted into digital signals through the data collection card, and the processing of the data signals are carried out in a computer. The system carries out the tracking of the drift of frequency and phase changes in a detection arm through a beat frequency signal which is generated by an interference reference arm and does not contain vibration information, can effectively avoid a distortion phenomenon of a detected signal, obtains the stable vibration signal intensity and frequency information, and improves the recognition rate of a vibration source.

A piezoelectric vibrator comprises a folded layered elastomer. The elastomer comprises at least three elastic beam units which are parallel with one another. Two adjacent elastic beam units are connected through a rigid connector. The elastic beam units at two ends of the elastomer are respectively connected with a rigid mass through a rigid connector. The surface of a random elastic beam unit or each of a plurality of elastic beam units is provided with a piezoelectric material layer. Furthermore electrode leads are arranged on the piezoelectric material layer for leading out electric current. When the piezoelectric vibrator is applied, the rigid mass at a random end is fixed with a vibration source. Vibration of the vibration source is transmitted to the elastic beam unit through the mass, thereby making the elastic beam units generate first-order bending deformation vibration, second-order bending deformation vibration and first-order torsional deformation vibration. A certain proportional relation exists among the vibration frequencies of the three vibration modes, thereby generating a plurality of resonance modes in a relatively wide frequency range next to a first-order resonance frequency and expanding the frequency response range of the piezoelectric vibrator.

The invention discloses a high-sensitivity microphone based on a quartz crystal resonator, which is on the basis of a force-frequency effect of the quartz crystal resonator, that is, if an oscillator of the quartz crystal resonator is subjected to the effect of a force or strain, the resonant frequency of the resonator changes in a linear manner along with changes of the force. The core of the invention is that a vibration diaphragm generates vibrations according to the size of pressure and different frequencies when being subjected to the pressure of sound waves, the vibration is converted into strain through a mechanical structure and acts on a quartz crystal, the quartz crystal resonator is enabled to generate frequency deviation so as to accomplish sound-electricity conversion, a vibration parameter of the diaphragm can be acquired through measuring the frequency deviation, and transmitted sound wave information can be further acquired. The microphone disclosed by the invention has the characteristics of high sensitivity, large frequency response range and small volume.

The drive power source comprises control circuit part and amplification circuit part. The control circuit part can generate impulse waveform in n routes of satisfying specific time sequence relation between each other. The amplification circuit part comprises identical sub amplification circuits. Number of sub amplification circuits is equal to number of input signals of amplification circuit part. Output of the control circuit part is as input of the amplification circuit part. Output of the amplification circuit part can drive m pieces of load. The said output can charge moving elements of actuator to carry out charging and discharging in both positive and negative directions. Advantages are: high output voltage, large current loading capacity, adjustable pulse frequency and pulse width of control signal, driving multiple moving elements in parallel.

A fiber optical audio preamplifier receives audio signals from an audio source, amplifies the audio signals, and transfers the signals to a power amplifier. The fiber optical audio preamplifier has at least one first signal converter. Each first signal converter acquires one audio signal from one audio source and converts the audio signal to a modulated light signal. At least one fiber optic volume control device that includes a variable optical attenuator that is connected to receive the modulated light signal. A control signal for sets an attenuation factor of the variable optical attenuator for attenuating the modulated light signal to control volume of the audio signal. One second signal converter is in communication with each fiber optic volume control device to receive the attenuated modulated light signal and demodulate the attenuated modulated light signal to recover the audio signal for transmission to the power amplifier.

The invention discloses a spherical intelligent aggregate for health monitoring of concrete structures, which comprises hollow spherical composite material particles, a negative electrode formed on the inner surface of the hollow spherical composite material particle and a positive electrode on the outer surface, and is encapsulated in the hollow An encapsulation structure with an electromagnetic shielding layer outside the spherical composite material particles, and cables and wireless transceivers connected to the positive electrode, negative electrode, and electromagnetic shielding layer; the spherical smart aggregate is formed in an array during the concrete construction stage Pre-embedded in the concrete structure under test, collect the acoustic signal detected by the spherical intelligent aggregate in wired or wireless working mode, and send it to the remote terminal system. The remote terminal system analyzes and records the received acoustic signal in real time to determine the concrete structure. overall health status. The invention can be embedded in the concrete during the construction of the building structure to realize long-term health monitoring of the concrete structure.

The invention discloses a foam metal-based multi-porous-channel IPMC electrically driven material and a preparation method therefor. A continuous and controllable porous channel structure is included in an IPMC substrate film; the porous channel structure is obtained by a method of embedding foam metal into a Nafion substrate film, casting and shaping and then removing; the dimension of the porous channel is determined by the dimension of the foam metal; compared with a conventional casted Nafion film, the dimension of the pore channels for migration of water molecules is 1-2nm, which is not suitable for migration of ionic liquid with relatively large dimensions; the dimension of the foam metal-based multi-porous-channel Nafion film disclosed by the invention is larger than that of the ionic liquid, so that migration of ionic liquid under an effect of an external electric field can be promoted, thereby greatly improving IPMC driving stability; and displacement is not lowered after 5h of continuous actuation in the air.

The invention relates to the technical field of optical fiber sensing monitoring and diagnosis application, in particular to an optical fiber sensing system and multi-parameter monitoring method for a reciprocating compressor. The optical fiber sensing system comprises a computer, an optical source module, an optical ring device, a signal demodulation unit, a branching unit and a sensing module. The branching unit is connected with the optical source module, the sensing module and the signal demodulation unit through optical fibers. The signal demodulation unit is connected with the computer through a data line. The sensing module comprises an optical fiber F-P acceleration sensor, FBG displacement sensors, an optical key phase sensor and an FBG temperature sensor. The optical fiber sensing system is reasonable in structure, and an optical fiber sensor has the beneficial effects of being small in size, high in anti-electromagnetic interference capacity, wide in frequency response range, high in precision and the like; and a multipoint distributed multi-parameter measuring manner is adopted in a monitoring system, the real-time change quantity of phase change parameters on key positions is acquired, a failure expert diagnosis and alarm system analyzes and diagnoses a failure source and a failure type, and effective failure type information early warning reminding is carried out.

The invention provides a phase-locked amplifier for detecting weak photo-current signals. The phase-locked amplifier comprises a signal channel, a reference channel and a phase-sensitive detector, and further comprises a low-pass filter; the signal channel comprises an I / V conversion circuit, a three-stage amplification circuit and an alternating-current coupler; and the I / V conversion circuit, the three-stage amplification circuit and the alternating-current coupler are connected in sequence. The phase-locked amplifier provided by the invention has the advantages that: detection of the weak photo-current signals is realized; and the phase-locked amplifier provided by the invention is wide in detectable input current range, wide in frequency response range bandwidth, good in linearity, low in cost, simple in circuit structure and relatively high in use value.

The invention discloses an OFDR system vibration detection method based on sliding time gating, and the method comprises the steps: carrying out the processing of collected data through a time gatingmethod in a data processing process of an OFDR system, and achieving the detection of a vibration signal along an optical fiber. Meanwhile, by setting the sliding step length, the effective sampling rate of data processing is improved, so that the frequency response range of the system is increased.

The invention relates to a vibration probe for detecting breaking points of a cable and a pressure pipeline, which mainly comprises an outer shell, a mandrel, an inner shield, an inner cover, a circuit board, a carrying handle, an aviation socket, a piezoelectric wafer and a base, wherein the circuit board is provided with an impedance conversion amplifying circuit containing two piezoelectric ceramic wafers with different inherent frequency Omega n and a summator; the inner shield is fixed on the outer shell; the base is fixedly connected with the inner shield by the mandrel; the piezoelectric wafer is installed on the mandrel; the inner cover is fixed on the inner shield; and the circuit board is fixed on the inner cover. The outer shell is formed by casting rubber, and the inner shield is made of nylon plastics. The adapterization probe of the piezoelectric ceramic wafers has wider frequency response range and more favorable effect of insulating sound in the air. A test proves that the output frequency range of the adapterization probe is obviously improved after the adapterization probe is adopted; compared with a single piezoelectric wafer probe, the output frequency range can be doubled approximately, and simultaneously, the interference on the sound in the air can be improved by 10-20db.

The invention relates to the technical field of electronics, in particular to a lightning arrester action information recording system and an implementation method. The lightning arrester action information recording system comprises a current sensor, a signal amplification integral module, a signal trigger recording module, a processor, a clock module and a solar power supply circuit; the lightning arrester action information recording system records the action information of the lightning arrester in a manner of driving the bistable relay to act by adopting an electric signal; when the bistable relay is set, the processor is awakened, quits the dormant standby state, records and stores the action information of the lightning arrester, resets the bistable relay, waits for the next actiontriggering of the lightning arrester, and switches to the standby dormant state again, and in the whole recording process, the awakening working time of the processor each time is about one second.

The invention discloses a transient-state waveform analysis system based on an electronic mutual inductor. The transient-state waveform analysis system based on the electronic mutual inductor comprises an electronic mutual inductor device, a high-precision sampling device and a waveform analysis device, wherein the electronic mutual inductor is connected with the high-precision sampling device via an optical fiber; the high-precision sampling device is connected with the waveform analysis device via an optical fiber; and the electronic mutual inductor device 1 is also connected with a bus alternating-current voltage input module via a line. According to the transient-state waveform analysis system based on the electronic mutual inductor, which is disclosed by the invention, not only the defects that the traditional mutual inductor can not provide higher sampling precision and time response are overcome, but also the data can be stored in a comtrade file format by the waveform analysis device, and the comtrade file format can be checked as postmortem analysis and also can be provided for other mainstream manufacturer analysis systems to serve as a data source.

The invention discloses a loudspeaker with a novel double-magnetic structure. The loudspeaker comprises a first voice diaphragm, a second voice diaphragm, a first voice coil, a second voice coil, a first copper ring, a second copper ring, a first concentrating flux plate, a second concentrating flux plate, a third concentrating flux plate, a fourth concentrating flux plate, a first magnet, a second magnet, an annular connecting block, a support, tuning paper and a PCB. A first concentrating flux plate is arranged on the first magnet, a third concentrating flux plate is arranged below the firstmagnet, the second magnet is arranged on the periphery of the first magnet, and the first magnet and the second magnet are fixed through an annular connecting block. The invention follows the acoustic principle so that the structure is excellent. The key point is that upper and lower voice diaphragms simultaneously pronounce; the two voice diaphragms are matched in a large-small mode, the defectsof low frequency and high frequency can be overcome at the same time, the frequency response range of the loudspeaker is wider, meanwhile, the magnetic circuit design enables the magnetic field intensity of the two voice diaphragms to be higher, the support and the magnetic set part adopt the injection molding process, and therefore the electroacoustic performance is more excellent, the process is simplified, and consistency is better.

The invention relates to the technical field of optical fiber sensing monitoring and diagnosis application, and especially refers to an optical fiber sensor structure for partial discharge of transformers. The optical fiber sensor structure comprises a computer, a light source module, a signal demodulation unit, an optical coupler, an optical fiber F-P acoustic sensor and a transformer. The optical coupler is connected to the light source module, the signal demodulation unit and the optical fiber F-P acoustic sensor through an optical cable. The signal demodulation unit is connected to the computer through a data line. The optical fiber F-P acoustic sensor is installed outside the transformer by a support beam type diaphragm structure. By using an optical fiber F-P acoustic sensor probe prepared by the MEMS technology, the consistency and mass production are improved. The optical fiber F-P acoustic sensor has the advantages such as small size, strong anti-electromagnetic-interference ability, wide frequency response range and high accuracy. By means of multi-point monitoring, a fault expert diagnosis and alarm device can locate the position of local discharge inside the transformerand monitor the discharge time and quantity.