119results about How to "Large output signal" patented technology

An integrated circuit, configured to process microphone signals, where the integrated circuit comprises: a preamplifier (306) with an amplifier section (301) which has a first input (φ) and a second input (φ*) and an output (φ), and with a feedback filter network (Z1; Z1, Z1*, Z2) coupled between the output (φ; φ, φ*) and the second input (φ′); where the first input (φ) to the amplifier section (301) has an input impedance which by means of the input impedance of the amplifier section is substantially isolated from the feedback network with respect to input impedance; and where the preamplifier has a frequency-gain transfer function which suppress low frequencies; and an analogue-to-digital converter coupled to receive an anti-aliasing filtered input signal and providing a digital output signal (Do).

The invention discloses a self-powdered sensor for detecting automobile tail gas and a preparation method thereof and belongs to the technical field of self-powdered active type gas sensors. The self-powdered sensor disclosed by the invention comprises a glass substrate, an interdigital electrode, a gas-sensitive thin film layer, an insulating polymer thin film layer, a conductive electrode and an insulating supporting structure. The self-powdered sensor disclosed by the invention can be used for collecting mechanical energy of tail gas exhausted by an automobile as a self-supply power source; and determination of NO2 gas in the automobile tail gas is realized through current or voltage output by a detection circuit. Compared with a traditional nitrogen dioxide sensor, a preparation process is simple, the cost is low, the practicability is high and an extra power supply system is not needed; the self-powdered sensor provided by the invention is novel in structure and natural energy is sufficiently utilized, so that the self-powdered sensor can be widely applied to detection of the automobile tail gas; and the problems of common self-powdered gas sensors based on piezoelectric effect that the sensitivity is low, an output signal is weak, an external force acting source is needed and the like can be solved.

A single package magnetoresistive angle sensor for use in measuring rotation angle of a magnet is disclosed. The magnetoresistive angle sensor comprises a pair of magnetoresistive sensor chips, wherein one of the chips is rotated by 180-degree rotation relative to the other. The magnetoresistive sensor chips are attached to a standard semiconductor package lead frame to form a single-axis push-pull full-bridge sensor. Each of the magnetoresistive sensor chips comprises a pair of magnetoresistance sensor arms. Each magnetoresistive sensor arm comprises one or more GMR or MTJ sensor elements. The GMR of MTR sensor elements utilize a pined layer. The element blocks of the magnetoresistive sensor electrically are interconnected and connected to the package leads by wirebonding. The magnetoresistive angle sensor can be packaged into various standard semiconductor package designs. Also, provided is a dual-axis push-pull full-bridge magnetoresistive angle sensor comprised of two pairs of magnetoresistive sensor chips.

The invention discloses a split type differential silicon micro resonant accelerometer. The split type differential silicon micro resonant accelerometer comprises a glass substrate, a lead layer, a bonding layer and a silicon structure layer, wherein the silicon structure layer is composed of an upper part structure and a lower part structure which are completely symmetrical, and each part structure comprises a mass block, a resonator, a lever amplification mechanism, a supporting beam, an anchoring area and other parts; the two anchoring areas are shared by the upper part structure and the lower part structure only in the middle, and the other structures are completely separated. Each mass block is connected with the corresponding anchoring area through a folding beam, each resonator is located in the middle of the corresponding mass block, an output beam and a pivot beam of a lever mechanism in each lever amplification mechanism are located on the same side of a lever arm, an input beam is located on the other side of the corresponding lever arm, an input beam of each lever is connected with the corresponding mass block, and an output beam of each lever is connected with the corresponding resonator. The split type differential silicon micro resonator accelerometer can not only effectively restrain common mode errors, but also completely eliminate coupling influences of the upper resonator and the lower resonator.

A current sensor includes a folded-shaped current path including a pair of arm portions extending in parallel with each other, and a pair of magnetoelectric conversion elements provided so as to sandwich therebetween a symmetric axis passing between the pair of arm portions, the pair of magnetoelectric conversion elements being used for detecting magnetism caused by a current passing through the pair of arm portions, wherein a half-bridge circuit in which the pair of magnetoelectric conversion elements is series-connected and a signal is able to be extracted from a connection point between the pair of magnetoelectric conversion elements is formed, and sensitivity axes of the pair of magnetoelectric conversion elements are oriented in a same direction and sensitivity-influencing axes of the pair of magnetoelectric conversion elements are oriented in a same direction.

The invention relates to a silicon micro angular vibration output gyroscope composed of an upper layer and a lower layer. The upper layer is a gyroscope mechanical structure arranged on a monocrystalline silicon wafer. The lower layer comprises signal leads arranged on a glass substrate. The upper mechanical structure is composed of two similar-structured substructures, wherein the substructures are symmetrically arranged left and right, and the substructures are connected through a mass block connecting mechanism. The two substructures are respectively connected to crossbeams, which are connected to fixed pedestals through horizontal torsion bars. The fixed pedestals are arranged on fixed pedestal bonding sites on the glass substrate. Therefore, the upper mechanical structure is suspended above the lower glass substrate. The signal leads and the bonding sites are arranged on the lower glass substrate. According to the invention, with the horizontal torsion bar and the crossbeams, the gyroscope rotates around the z axis. Therefore, sensitive motion of the gyroscope is realized; motion decoupling of a driving direction and a detection direction is realized; the number of interference modes is reduced; requirement to processing precision is reduced; and sensitivity of the gyroscope is improved.

The invention discloses a high sensitive biochemical sensor based on a resonance oscillation type micro cantilever beam structure. The biochemical sensor comprises a resonance oscillation chamber, a cantilever beam and a Whist bridge type detection circuit, wherein a micro column structure (3), a liquid storage tank (4) and a liquid leakage hole (5) through which biochemical solution flows are etched at the free end of the cantilever beam; the support end of the cantilever beam is connected with the Whist bridge type detection circuit; the Whist bridge type detection circuit is composed four U-shaped piezoresistance bars (1), three input electrodes (8, 9, 10) and two output electrodes (7, 11); and the four piezoresistance bars (1) are connected with the input electrodes (8, 9, 10) and the output electrodes (7, 11) through a signal transmission line (2). With the adoption of the biochemical sensor, micro biochemical molecules can be sensed with a high sensitivity by detecting the frequency change after an object to be tested is absorbed; biochemical molecules with micromass can be detected; and the biochemical sensor can be widely used in engineering fields such as medicine and chemistry.

The invention discloses an improved wind load pressure sensor, comprising a sensor shell, an oil charge sensitive body and a signal conditioning circuit, wherein, the oil charge sensitive body is composed of a sensitivity body shell in the form of a groove, a silicon integrated sensitive chip and an elastic separation film fixed on the opening of the groove, the ring circumambience of the back pressure face of the silicon integrated sensitive chip is fixed at the bottom of the groove through a fixed supporting ring in a sealing manner, the back pressure face of the silicon integrated sensitive chip is communicated with ambient pressure through a back pressure airway tube, the pressure surface of the silicon integrated sensitive chip is provided with a Wheatstone bridge on which a strain resistor is led to the signal conditioning circuit through an internal lead and a lead column and then is output, the non-pressure surface of the silicon integrated sensitive chip is provided with a temperature sensor, a heating resistor and a constant temperature control circuit controlling the heating resistor according to the temperature sensor, and silicon oil is filled among the elastic separation film, a groove internal ring surface and the pressure surface of the silicon integrated sensitive chip. The invention can control the temperature of the oil charge sensitive body, and eliminate the problem that an oil charge micro-pressure sensor is in fault due to the influence of ambient temperature, thereby realizing high-accuracy survey of wind loads.

The invention relates to a quartz micromechanical gyroscope which is based on the shear stress detection and a manufacturing method. The quartz micromechanical gyroscope comprises a support quality block, a first cantilever beam, a second cantilever beam, a first driving beam, a second driving beam, four movable quality blocks, a driving electrode and a detection electrode; the first cantilever beam and the second cantilever beam are symmetrically arranged on both ends of the support quality block; the support quality block is connected with the first driving beam through the first cantilever beam; the support quality block is connected with the second driving beam through the second cantilever beam; the arrangement direction of the first driving beam and the second driving beam is perpendicular to the arrangement direction of the first cantilever beam and the second cantilever beam; and the four movable quality blocks are respectively fixed at the end parts of the first driving beam and the second driving beam. The invention provides the quartz micromechanical gyroscope which is based on the shear stress detection and has the advantages of simple and compact structure, low cost, simple manufacture process, high sensitivity and strong anti-interference ability and the manufacturing method.

The invention discloses a self-powered sensor for detecting alcohol and a preparation method of the self-powered sensor, belonging to the field of a self-powered initiative-type gas sensor. The self-powered sensor comprises a glass substrate, an interdigital electrode, a gas-sensitive film layer, an insulating polymer film layer, a conducting electrode and an insulating supporting structure. The self-powered sensor can collect mechanical energy of the expiratory airflow of the human body so as to provide the energy, and the alcohol concentration in the breathed air can be determined by virtue of current or voltage outputted by a detection circuit. Compared with the traditional alcohol sensor, the self-powered sensor is simple in preparation process, low in cost, high in practicability, and free from needing an additional power supply system. The self-powered sensor is novel in structure, capable of sufficiently utilizing the natural energy and capable of being widely used for detecting the drunk driving.

An electrode for measuring micro dissolved oxygen belongs to the technical field of electrochemical sensors. On the basis of the original battery type electrodes, the electrode adopts a spongy-shaped lead as the positive electrode so as to greatly increase the effective area of the positive electrode and enable the surface and the interior of the positive electrode to both react with oxygen molecules of the dissolved oxygen, thereby greatly prolonging the service life of the electrode, increasing the sensitivity of the electrode to the oxygen molecules and outputting large and stable signals under the condition of measuring the micro dissolved oxygen; with output current being three magnitudes larger than a traditional electrode, the electrode has the advantages of high capacity of resisting disturbance, stable performance, good reproducibility, convenient use, less electrode maintenance, and the like, and is particularly suitable for measuring or on line monitoring the micro dissolved oxygen in water fed to a boiler in a heat power station or nuclear power station.

The invention relates to a thermistor type air velocity transducer with temperature compensation. The thermistor type air velocity transducer is used for air velocity measurement, is also used for flow velocity measurement of other gases and insulating fluids and belongs to the technical field of transducers. The thermistor type air velocity transducer with temperature compensation comprises a self-heating thermistor, a temperature-compensation thermistor, an insulating pillar, a metal tube and conducting wires. The thermistor type air velocity transducer with temperature compensation is not provided with a mechanical movement mechanism, causes little damage to a flow field, has small measurement inertia, can measure low air velocity, has high precision, a long service life, a high output signal, a simple back-end processing circuit, a reliable structure, a small size and a light weight; and the thermistor type air velocity transducer with temperature compensation is not only used for the air velocity measurement, but also used for the flow velocity measurement of other gases and insulating fluids.

The invention provides a magnetic field sensor utilizing the giant magnetoresistive effect of a ferromagnetic nano-ring, and belongs to the technical field of magnetic nano-sensors. The sensor is composed of a ferromagnetic nano-ring prepared on a substrate of nanometer size and a group of lead wires; the group of lead wires connected to the two ends of the ring also serve as a constant current source connecting wire and a voltage measurement connecting wire; the outside diameter D of the ferromagnetic nano-ring is 7 nm-10 um; the inside diameter d is smaller than the outside diameter D; the width of the ring is 5 nm-1 um; and the thickness of the nano-ring is 1 nm-500 nm. The sensor utilizes the ferromagnetic nano-ring under the action of the outside magnetic field, and the resistance the ferromagnetic nano-ring changes greatly, so as to detect the change of the outside magnetic field; the manufacture is very simple; the output signal is large; and the response is fast. The sensor is especially applicable to the detection of the threshold value of the magnetic field change; besides, the magnetic field sensitivity of the magnetic field transformation point can reach 2-10 percent/Oe or is higher than 2-10 percent/Oe, and the sensor also can serve as a magnetic cell.

The invention discloses a double-shaft split type differential silicon micromachined resonant accelerometer which comprises an upper-layer silicon micromechanical structure and a lower-layer glass base, wherein the upper-layer silicon micromechanical structure is bonded on the glass base, the upper-layer silicon micromechanical structure consists of four upper-layer silicon micromechanical sub-structures which are completely identical, the upper-part structure and the lower-part structure at the left side form one group of differential structures for measuring an acceleration in a Y direction, and the upper-part structure and the lower-part structure at the right side form another group of differential structures for measuring an acceleration in an X direction. According to the double-shaft split type differential silicon micromachined resonant accelerometer disclosed by the invention, common mode errors between two groups of two resonators forming the differential structures can be effectively inhibited, the coupling influence between the two resonators is eliminated, and the decoupling between the X direction and the Y direction can be realized.

The invention relates to a handheld type knocking detector. The detector comprises a knocking hammer, a driving module, and a microprocessor control unit. The detector is characterized in that the knocking hammer comprises an electromagnetic coil, a ferromagnetic block, a metal frame, a metal sliding rod, a spring, and a knocking head; and the knocking head comprises a piezoelectric sensor and a hammer head. The invention also relates to a detection method. The method comprises the following steps of: sampling a standard test piece of a honeycomb composite material firstly, and collecting voltage waveforms of defect-free locations; amplifying a signal output by a piezoelectric sensor by carrying out amplification isolation, and converting a differential signal into a single-ended signal toobtain a smooth signal with good quality; obtaining a wave width W0 of the smooth signal as a debonding degree of the standard test piece; and detecting a to-be-tested piece to obtain a signal wave width W1 of the to-be-tested piece, and comparing W1 with W0, the greater the difference value, the stronger the degree of debonding, and the smaller the value, the better the quality. The handheld type knocking detector and the detection method have the advantages of being convenient and fast to detect and high in precision.

The invention discloses an active air-chamber structure and photoacoustic spectrometry gas sensing system. The active air-chamber structure and photoacoustic spectrometry gas sensing system comprises an integrated light source, a photoacoustic cell, a microphone, a photoelectric detection module, a signal processing module, a light source control module and a data output module; the integrated light source and one end of the photoacoustic cell are directly packaged into a whole, and the microphone is installed on the side wall of the photoacoustic cell; the photosensitive surface of the photoelectric detection module is aligned to a light emitting port of the photoacoustic cell, the output end of the photoelectric detection module and the output end of the microphone are both connected to the input end of the signal processing module, one output end of the signal processing module is connected with the light source control module, the other output end of the signal processing module is connected with the data output module, and the light source control module is connected with the control end of the integrated light source. According to the active air-chamber structure and photoacoustic spectrometry gas sensing system, the structural design of directly packaging a specially designed DFB semiconductor laser and one end of an air chamber into a whole is adopted, the intermediate link of coupling with optical fibers is omitted, and the injected light power is greatly increased; meanwhile, the light beam adjustment structure is simplified, and air chamber miniaturization and stability improvement are achieved.

A molecular probe marked with a color center material is used as a photoacoustic imaging agent to obtain an acoustic signal of practically adequate intensity using weak near-infrared light, which has good in vivo penetration depth but has small excitation energy, and is within the maximum permissible exposure, in photoacoustic tomography (PAT) diagnosis of a living body.

The invention relates to an active matrix substrate and manufacturing method thereof. The active matrix substrate comprises a display region and a non-display region, wherein the display region comprising grid lines and data lines formed on the substrate, and each pixel region defined by the grid lines and the data lines, wherein a pixel electrode and a film transistor are formed in the pixel region; and an optical sensor with an audion structure is formed on the substrate. The active matrix substrate is provided with the optical sensor with the audion structure so that the optical sensitive current generated by the external light is amplified in the optical sensor, the output signal of the optical sensor is increased and the flexibility of the optical sensor for detecting the external light is improved.

The invention belongs to the technical field of inertial navigation, and particularly relates to a gyroscope error calibration method for rapidly calibrating all the error parameter values of a gyroscope by using output values of a system measurement assembly during uniform speed rotation relative to an inertial space. The method comprises that: a strapdown inertial navigation system is arranged on a position change mechanism, the three rotation shafts of the position change mechanism are respectively arranged along the right direction, the front direction and the upper direction of a carrier, aligning is performed after the system is subjected to start-up pre-heating to obtain an initial strapdown attitude matrix, the attitude angle of an IMU coordinate system relative to an inertial coordinate system at the initial time is measured, and the position change mechanism is controlled to drive the IMU to successively rotate according to the measured attitude angles, such that the IMU coordinate system coincides with the inertial coordinate system. According to the present invention, the influence of the high frequency noise in the system can be eliminated, and the IMU rotates relative to the inertial coordinate system so as to make the output signal of the gyroscope be amplified and make the interference resistance strong; and the method has characteristics of simple position change sequence, simple calculation, effective gyroscope calibration speed improvement, and effective gyroscope calibration precision increase.

The invention discloses a semiconductor strain balance applied to a pulse wind tunnel. The balance sequentially comprises a model connecting section, a first combined measuring element, an axial forcemeasuring element, a second combined measuring element, an accelerometer mounting section, a balance supporting rod and a supporting section from front to back. Aiming at the characteristic of shorteffective time of a pulse wind tunnel, the balance adopts a semiconductor strain balance form, and meanwhile, the balance and the supporting rod are designed into a whole, so that middle parts are reduced, and the rigidity of the balance is enhanced. According to the balance, on the basis of a three-piece beam type combined measuring element, a side piece beam is divided into an upper piece beam and a lower piece beam which are respectively used for measuring a lateral force, a yawing moment and a rolling moment, so that the sensitivity and the measuring precision of the rolling moment are improved.

The invention provides a mechanical groove enhanced differential piezoelectric ultrasonic transducer and a working method thereof. The ultrasonic transducer comprises an ultrasonic transducer body, wherein the ultrasonic transducer body comprises a base layer, a stop layer, an elastic layer, a bottom electrode and a piezoelectric layer, a cavity is formed in the bottom of the base layer, the stoplayer is fixedly arranged on the base layer, and the elastic layer, the bottom electrode and the piezoelectric layer are sequentially arranged in the direction from the base layer to the stop layer. Atop inner electrode is arranged on the piezoelectric layer, a top outer electrode is arranged around the periphery of the top inner electrode, a mechanical groove set is formed between the top innerelectrode and the top outer electrode, and an opening of the mechanical groove set faces the piezoelectric layer. The ultrasonic transducer is simple in structure, the differential electrode design ofthe top inner electrode and the top outer electrode enables the ultrasonic transducer to work in a differential electrode working mode, and signals in an ideal state of the mode can be doubled and enhanced to a single electrode working mode. Meanwhile, due to the design of the mechanical groove, output signals and sensitive signals of the ultrasonic transducer can be enhanced, and then the sensing sensitivity of the ultrasonic transducer is improved.

The invention discloses a photoacoustic spectrometry gas sensing system of an active air chamber based on a semiconductor laser. The photoacoustic spectrometry gas sensing system comprises an integrated semiconductor laser, a photoacoustic pool, a microphone, a photoelectric detection module, a signal processing module, a semiconductor laser control module, and a data output module, the integratedsemiconductor laser is directly integrated with one end of the photoelectric pool, the microphone is arranged on a side wall of the photoelectric pool, and a photosensitive surface of the photoelectric detection module aligns at a light extraction port of the photoelectric pool; the photoelectric detection module and an output terminal of the microphone are connected with an input terminal of thesignal processing module, the output terminal of the signal processing module is connected with the semiconductor laser control module, and the other output terminal is connected with the data outputmodule; and the semiconductor laser control module is connected with a control terminal of the integrated semiconductor laser. The photoacoustic spectrometry gas sensing system omits a middle link ofcoupling with fiber, injected light power is greatly increased, a light beam adjusting structure is simplified, and air chamber miniaturization and stability are increased.