200results about "Force measurement by measuring frquency variations" patented technology

The invention relates to the technical field of MEMS microsensors, and discloses a resonant pressure sensor and a preparation method thereof, the resonant pressure sensor comprises a substrate layer and a resonant assembly, the substrate layer comprises a support substrate and a pressure sensitive film; the supporting substrate is located at the side part of the pressure sensitive film; the resonance assembly comprises a first resonance beam and a second resonance beam which are arranged in parallel, two ends of the first resonance beam are connected with the pressure sensitive film through a first anchor area and a second anchor area, and two ends of the second resonance beam are connected with the pressure sensitive film through a third anchor area and a fourth anchor area; the first resonant beam and the second resonant beam are coupled and connected together through the mass block and the spring; the resonance assembly further comprises a first driving electrode unit and a second driving electrode unit. The first driving electrode unit is positioned on one side of the first resonant beam; the second driving electrode unit is located on one side of the second resonant beam. Compared with the prior art, the detection sensitivity, precision and reliability of the sensor can be improved, the Q value is improved, and the measuring range of the sensor is increased.

The invention provides a resonant pressure sensor with adjustable measuring range and sensitivity, and relates to the technical field of sensors, and the resonant pressure sensor comprises a pressure sensitive film which is used for detecting external pressure; the resonator layer comprises a double-end clamped resonant beam, the double-end clamped resonant beam is arranged above the pressure sensitive film, a movable part of the double-end clamped resonant beam is suspended, one side of the double-end clamped resonant beam is provided with two driving electrodes for applying an alternating current driving signal and a parameter pumping alternating current signal respectively, and the other side of the double-end clamped resonant beam is provided with two detection electrodes; the silicon sealing cover layer is provided with a resonant cavity, and the resonant cavity is located above the pressure sensitive film and the double-end clamped resonant beam and used for providing a deformation space for the pressure sensitive film and providing a vibration space for the double-end clamped resonant beam; in the first working mode, the first-order mode of the resonant beam is split into two amplitude peak values by applying a parameter pumping alternating current signal, and the sensitivity of the output amplitude ratio is adjusted by adjusting the amplitude of the parameter pumping alternating current signal; the measurement range is adjusted by adjusting the frequency of the parameter pumping alternating current signal.

A leadless high-sensitivity all-quartz differential resonant pressure sensor chip comprises a quartz protection layer, the quartz protection layer is in bonding connection with a first quartz resonance layer, and the first quartz resonance layer, a quartz differential layer, a second quartz resonance layer and a quartz intermediate layer are in sealed connection through a glass frit bonding technology. The quartz middle layer and the quartz temperature sensing layer are in butt joint through a bonding technology, and the quartz temperature sensing layer and the quartz base are fixed through a glass frit bonding technology. After the conductive silver paste is subjected to high-temperature curing treatment, electrode signal conduction between the gold-plated lead columns and the first quartz resonance layer, the second quartz resonance layer and the quartz temperature sensing layer is realized; the differential output effect is remarkably improved, and conjugate interference is effectively restrained; the long-term stability of the vacuum sealing device is improved; the sensor sensitivity is improved; the reliability and the stability of electrical connection are improved; the problem of temperature measurement lag of an external temperature sensor is eliminated, and the precision of the sensor is further improved.

The utility model discloses a bridge stress-strain signal sensor, and belongs to the field of bridge stress-strain sensors, and the bridge stress-strain signal sensor comprises a vibrating wire type sensor body and fixing mechanisms disposed at two ends of the vibrating wire type sensor body. The fixing mechanism comprises positioning assemblies fixedly installed at the two ends of the vibration wire type sensor body and pre-tightening adjusting assemblies arranged on the side faces of the positioning assemblies and used for adjusting the pre-tightening force of the vibration wire type sensor body. The pre-tightening adjusting assembly comprises a connecting plate used for being connected with the surface of the bridge and sliding rods symmetrically fixed to the connecting plate and slidably connected with the positioning assembly. According to the bridge stress-strain signal sensor, through the welding frame and the friction particles on the connecting plate and filling of the epoxy resin, the fitting degree of the sensor and the surface of a bridge is effectively improved, and the problem of mounting looseness caused by deviation of the flatness of the surface of the bridge is reduced.

The invention relates to the field of geotechnical engineering monitoring. The invention provides a vibrating wire type stress meter and application thereof in tunnel surrounding rock stress monitoring. The device comprises a shaft sleeve, a steel bar, a fixing part, a steel string and an excitation sensing module, the end of the steel bar is located in the shaft sleeve, and the fixing part and the steel string are axially arranged in the shaft sleeve. Fixing parts are arranged at the two ends of the steel string, and the ends, away from the steel string, of the fixing parts are connected with the steel bars. The excitation sensing module is arranged above the steel string and installed outside the shaft sleeve. Wherein the middle part of the steel string is a twisted section, and two ends of the steel string are linear sections. According to the invention, the steel string preferentially releases geometric deformation under the action of axial tensile stress through the pre-arranged twisting section in the middle of the steel string, thereby effectively enlarging the amplitude change caused by micro stress, enhancing the response sensitivity of the steel string, breaking through the structural limitation that the stability and the sensitivity of a traditional stress meter are difficult to achieve at the same time, and improving the reliability of the stress meter. The method is suitable for high-reliability and high-precision application scenes in tunnel surrounding rock stress monitoring.

The invention relates to the technical field of pressure sensors. The invention specifically relates to an MEMS resonant pressure sensor and a manufacturing method thereof. The MEMS resonant pressure sensor provided by the invention comprises a substrate layer; the substrate layer comprises a sensitive film; the sensitive film is suitable for converting pressure applied by the sensor into stress; an intermediate layer; the middle layer comprises a harmonic oscillator structure; the harmonic oscillator structure is connected to the sensitive film through the anchor area and is suitable for converting stress converted by the sensitive film into resonant motion of the harmonic oscillator structure. The middle layer further comprises an excitation detection structure; and the excitation detection structure is arranged at the side part of the harmonic oscillator structure and is suitable for exciting the resonant motion of the harmonic oscillator structure, detecting the frequency of the resonant motion and calculating the pressure applied by the sensor through the output electric signal. The harmonic oscillator structure comprises a resonant beam and a fixed beam which is perpendicular to the resonant beam and is connected with the resonant beam. One end of the fixed beam is connected to the midpoint of the resonant beam. The MEMS resonant pressure sensor provided by the invention has relatively high sensitivity.

An apparatus for determining an efficiency index of a process comprises processing equipment (103) for receiving data indicative of service produced by the process and data indicative of efficiency parameters needed for production of the service The apparatus comprises a memory (101) storing response quantities each associated with a predetermined stress range and expressing an upper limit for number of stress cycles at an observation point of a mechanical system used in the process, where the stress cycles have the stress range related to the response value. The processing equipment updates stress history quantities expressing number of occurred stress cycles having stress ranges related to the response quantities. A fatigue damage sum is estimated based on the response quantities and the stress history quantities. The efficiency index is formed based on the service, the efficiency parameters, and the fatigue damage sum.

The present invention relates to a mechanical monitoring sensor for a segment, and an auxiliary mounting device thereof. The sensor comprises a pressure-bearing component and a sensor body. The pressure-bearing component is independent of the sensor body. An arch-shaped shell of the pressure-bearing component deforms under external pressure to extrude a pressure-bearing liquid inside to pass through a first liquid pipe and a second liquid pipe to enter the sensor body so as to push a sensing end of a piston to move. A sensing diaphragm on the sensing end of the piston is in contact with the pressure-bearing liquid, a fixed end of the piston is connected to a steel wire by means of a spring, and the piston converts the pressure received by the sensing diaphragm into a pulling force on the steel wire. The present invention has the advantages such as long service life and high reliability of monitoring data.

The present application belongs to the technical field of engineering structure health monitoring, and discloses a photovoltaic flexible support cable force non-contact monitoring method and system based on video vibration. First, a cable video sequence is acquired, and a dynamic sensitive area is adaptively divided along the cable image. The time sequence average value of the pixel intensity in each area is calculated, the two-dimensional image information is converted into a one-dimensional vibration time history signal, and the light drift and image noise are suppressed through difference and wavelet denoising. After filtering the signal of each dynamic sensitive area, the initial frequency set is formed by preliminarily extracting the multi-order dominant frequency estimate value. The frequency observations from all areas are fused and analyzed, and the real frequency cluster is identified. The weighted centroid frequency of the cluster is used as the multi-order vibration frequency. Finally, the multi-order frequency is substituted into the model, and the real-time cable force value is output. The whole process of the method does not need to contact the measured cable, and provides an innovative and reliable solution for long-term online safety monitoring of the flexible support cable force in complex environments.

The present invention discloses a sensor system and method. The sensor system includes one or more rotor antennas on an axis moving in a stator bracket, the one or more rotor antennas are one or more of the conditions around the axis of the sensor system or along the axis of the sensor system, and the one or more rotor antennas are configured to communicate sensing data with the one or more stator antennas on the stator bracket. Each rotor antenna has a rotor signal trace disposed on an outer rotor side of a dielectric substrate of the rotor antenna and a rotor return trace disposed on the outer rotor side of the dielectric substrate, wherein the rotor signal trace and the rotor return trace are not concentric with respect to each other.

The present invention provides a stress monitoring device for a steel sheet pile cofferdam of a large-scale gate pump project along the river. A heat insulating pad is arranged in a connecting sleeve, and the connecting sleeve and a butt screw are connected through a butt screw sleeve. The end of a steel bar is fixedly connected to the butt screw, and the end of the butt screw can abut against the heat insulating pad, and the heat insulating pad can continuously cool the end of the steel bar and the butt screw. The present invention can disassemble the butt screw sleeve and the threaded shell of the welded butt screw. When welding, the butt screw and the butt screw sleeve are first disconnected, and the welding slot of the butt screw is separately sleeved on the end of the steel bar for welding. During the welding process, the butt screw is kept separated from the vibrating-wire stress gauge to avoid the influence of the temperature during the welding process on the vibrating-wire stress gauge. During the threaded connection process, the end of the butt screw will be partially isolated between the heat insulating pad and the inner wall of the butt screw sleeve, which is conducive to reducing the contact area between the butt screw and the butt screw sleeve.

To provide a pressure sensing device using a remote and passive bioimplantable pressure sensor.SOLUTION: A wireless pressure sensing unit 20 comprises a membrane forming an outer wall portion of a cavity and two permanent magnets in the cavity. One magnet is coupled to the membrane and at least one of the magnets freely oscillates by a rotational movement. The at least one freely oscillates by a rotational movement. The oscillation occurs at a resonant frequency that is a function of the pressure being sensed, and the pressure affects the space between the two permanent magnets. This oscillation frequency can be sensed remotely by measuring the magnetic field changed by the oscillation. The wireless pressure sensing unit is provided on a catheter 21 or a guide wire.SELECTED DRAWING: Figure 1

The invention relates to a sensor unit (20) for detecting forces and their directions in the XY plane, comprising at least two sensors distributed on a mechanical measuring body (10). According to the invention, the at least two sensors are surface acoustic wave (SAW) sensors (24), wherein one or more milled grooves (22) are formed in the surface of the measuring body (10) for controlling the propagation of surface acoustic waves, and wherein the SAW sensors (24) are arranged on the measuring body (10) such that a precise determination of the direction and magnitude of the acting forces in the XY plane is enabled.

The utility model provides a novel steel bar stress meter, which comprises a steel bar stress meter main body, the steel bar stress meter main body is respectively connected with corresponding modular pull rods through pull rod sleeves arranged at the two ends of the steel bar stress meter main body, each modular pull rod is respectively connected with a corresponding pile steel bar, and the two pile steel bars are arranged in a mirror symmetry manner; a wire of the steel bar stress meter main body is led to the ground surface; the splicing module type pull rod is innovatively adopted, the core of the splicing module type pull rod is that the positioning ring is ingeniously matched with the butt joint bolt, so that the welding rod is stably installed on the pile steel bar, and accurate welding can be achieved without an extra tool. During welding, the modular pull rod is separated from the pull rod sleeve of the steel bar stress meter body, high-temperature transmission is effectively blocked, the sensor is protected against damage, additional cooling measures are not needed, the stability and reliability of the system are remarkably improved, and the operation process is simplified through the design.

The invention discloses an interface soil pressure detection device and method based on a stress ring, a pressure gauge comprises an outer protection cover, an upper bearing plate, an upper supporting plate, a fixing plate, an extension rod, the stress ring, a bearing ring, a lower supporting plate, a lower bearing plate and a one-way hinge, the outer protection cover is a protection cover when the interface pressure gauge is used, the damage to the pressure gauge is reduced, and the reliability of the interface pressure gauge is improved. Pressure is borne by the upper force bearing plate and the lower force bearing plate, measurement is carried out through deformation of the stress ring in the middle of the interface pressure gauge, and the one-way hinge is used for converting the pressure of the upper force bearing plate into resultant force and uniformly transmitting the resultant force to the stress ring. And the soil arching effect caused by the pressure film sinking below the pressure gauge shell is avoided. According to the invention, a set of multi-stage decoupling interface stress transmission and sensing architecture is constructed, thorough immunity to bending moment and shear interference is realized, and the technical problem that the traditional pressure gauge fails due to unbalance loading and soil body effect is fundamentally solved.

The invention discloses an oil-filled medium isolation packaging type silicon resonance pressure sensor and a preparation method thereof, belongs to the technical field of MEMS pressure sensors, and solves the problem that an existing pressure sensor is liable to have intermittent faults. The device specifically comprises a tube body, a concave cavity is formed in the top of the tube body, and a silicon resonance chip is arranged in the concave cavity; a cap is mounted at the top of the tube body, an isolation diaphragm is arranged between the cap and the tube body, and silicone oil is filled between the isolation diaphragm and the tube body. According to the invention, a measurement medium enters the cap through the filler neck to extrude the isolation diaphragm, the isolation diaphragm generates micro deformation when sensing the pressure of the medium, the pressure is transmitted to the silicon resonance chip through silicone oil in the pipe body, and the silicon resonance chip converts the external pressure into a perceivable analog signal; in the process, an external measuring medium does not directly act on the silicon resonance chip, so that the problem of intermittent fault or complete failure of the silicon resonance sensor in a corrosive gas or liquid environment is avoided.

The utility model discloses a vibrating wire signal conditioning circuit in the field of power electronics, which comprises a filter protection circuit, the filter protection circuit is connected with an excitation power supply circuit and a clamping amplification circuit, and the clamping amplification circuit is connected with an operational amplifier power supply circuit and a hysteresis comparison circuit. Vibrating wire signals of a vibrating wire sensor are received through the filtering protection circuit, the signals are filtered and then output to the clamping amplification circuit, it is ensured that the amplitude of the vibrating wire is not too large, the vibrating wire signals are amplified and then converted into digital signals through the hysteresis comparison circuit, the digital signals are finally sent to the single-chip microcomputer to be sampled, and the output digital signals are good in stability and high in reliability. The fidelity is high, the linearity is good, and the ADC sampling result is more accurate.

An embodiment of the present disclosure relates to a method (100) particularly for checking mechanical stress acting on an induction component (210). The method (100) includes: detecting (110) one or more measurement variables related to mechanical stress when an electrical excitation signal is applied to the induction component (210). The method (100) further includes: determining (120) the mechanical stress acting on the induction component (210) based on the one or more detected measurement variables.

The invention provides a silicon resonance temperature and pressure sensor and a preparation method thereof. The silicon resonance temperature and pressure sensor comprises a pressure sensing layer, a resonance layer and a bottom silicon layer which are connected in sequence, the resonance layer comprises a cover plate and a resonance assembly, the resonance assembly comprises a resonance main beam, a first resonance auxiliary beam, fixed comb teeth, a second resonance auxiliary beam and a temperature resonance beam, the cover plate and the silicon island are correspondingly arranged, the resonance main beam is connected with the cover plate and the first resonance auxiliary beam, the first resonance auxiliary beam and the fixed comb teeth form a first electrostatic comb tooth pair, and the second resonance auxiliary beam and the temperature resonance beam form a second electrostatic comb tooth pair; the fixed comb teeth and a second resonance secondary beam form a second electrostatic comb tooth pair, and the second resonance secondary beam is connected with a temperature resonance beam; periodic driving signals are loaded to the first electrostatic comb tooth pair and the second electrostatic comb tooth pair respectively, the first resonance auxiliary beam drives the resonance main beam to vibrate periodically, and the second resonance auxiliary beam drives the temperature resonance beam to vibrate periodically. The to-be-measured pressure and the to-be-measured temperature are respectively measured by detecting the resonant frequency change of the first resonant secondary beam and the second resonant secondary beam.

The application discloses a double-vibration-beam differential metal-based two-stage amplification quartz resonant pressure sensing structure, relates to the technical field of micro-mechanical electronic (MEMS) pressure measuring devices, and comprises a pressure probe structure element, wherein the pressure probe structure element is connected with a metal flexible lever structure, the metal flexible lever structure is connected with a first quartz double-end fixed support vibration beam and a second quartz double-end fixed support vibration beam, and the first quartz double-end fixed support vibration beam and the second quartz double-end fixed support vibration beam are arranged in a differential mode. The application realizes differential loading at the mechanical structure level, effectively suppresses the temperature common-mode drift and the influence of packaging residual stress, and improves the measurement precision and stability.

The invention relates to the technical field of pressure detection, in particular to a quartz pressure sensor with double harmonic oscillators orthogonal in crystal axis, which comprises two quartz end caps, and a positive partial harmonic oscillator, a quartz ring and a negative partial harmonic oscillator which are arranged between the two quartz end caps, the positive partial harmonic oscillator and the negative partial harmonic oscillator are respectively bonded with two ends of the quartz ring, and the internal force transmission beams of the positively biased harmonic oscillator and the negatively biased harmonic oscillator are in an orthogonal vertical relationship to form an orthogonal double harmonic oscillator. Compared with a quartz vibrating diaphragm type pressure sensing structure in the market, the pressure sensor adopts the design of the orthogonal double harmonic oscillators, and the sensitivity of the pressure sensor is effectively improved by utilizing the characteristic that the force frequency coefficients of the two harmonic oscillators are opposite.

The application discloses a multistage pressure-releasing supporting structure applied to underground engineering, and relates to the technical field of underground engineering, in particular to a multistage pressure-releasing supporting structure applied to underground engineering.

This invention relates to the field of sensor miniaturization technology and discloses a method for miniaturizing a pressure resonant transmitter. The method includes: analyzing design specifications to break down the transmitter into multiple functional units; obtaining the morphological and electrical parameters of each unit, and accordingly forming compression and fusion metrics to quantify the physical compression potential and functional fusion feasibility; deriving improvement coefficients for each unit based on these metrics, and then reconstructing these coefficients according to the dependencies between units to accurately reflect their optimization value in the overall system; prioritizing the processing of the reconstructed coefficients, and automatically generating an optimization scheme. This invention overcomes the shortcomings of existing technologies that rely on local experience and lack a global perspective through dual quantitative indicators and system-level dependency analysis, achieving precise miniaturization design and system optimization.

The invention provides a method and a device for identifying surface internal stress of a unidirectional tension metal sheet. The identification method comprises the following steps: monitoring the mode of the unidirectional tension metal sheet in real time, and obtaining the vibration frequency of the unidirectional tension metal sheet; establishing a free vibration differential equation of the unidirectional tension metal sheet on the basis of a Kirkhoff plate-shell theory; representing a general solution of a free oscillatory differential equation of the unidirectional tension metal sheet based on the situation that two opposite sides of the unidirectional tension metal sheet are simply supported and tensioned and the other two opposite sides are randomly supported; based on a free vibration differential equation of the unidirectional tension metal sheet and a general solution of the equation, establishing a frequency equation of the unidirectional tension metal sheet; and based on the vibration frequency of the unidirectional tension metal sheet, the uniform tension acting on the plate edge of the unidirectional tension metal sheet is calculated through a frequency equation. According to the method, the differential equation can be established based on the modal of the one-way tension metal sheet according to the CokylHough plate shell theory, and the surface internal stress state of the metal sheet is identified, so that the evaluation of the performance of the one-way tension metal sheet is realized.

To provide a force sensor capable of measuring force according to deformation of an elastic hinge with high sensitivity.SOLUTION: A force sensor 11 includes: a pair of elastic hinges 22a, 22b in which a movable body (link material 16) deforming relatively to a fixing body 12 is connected to the fixing body 12, which has a shape of regulating the deformation of the movable body around a reference axis 21, and which is provided with a gap S in an axial direction of the reference axis 21; and a piezoelectric element 25 which is provided between the elastic hinges 22a, 22b, whose one end is fixed to the fixing body 12, and whose the other end is fixed to the movable body.SELECTED DRAWING: Figure 2

The invention discloses a large-diameter antenna cable net tension dynamic monitoring device and method, the large-diameter antenna cable net tension dynamic monitoring device comprises a first cylindrical fixing piece and a second cylindrical fixing piece, and a hollow pin is arranged between the first cylindrical fixing piece and the second cylindrical fixing piece; a sensitive core body is arranged in the hollow pin, and two ends of the sensitive core body are respectively fixed on the first cylindrical fixing piece and the second cylindrical fixing piece; the sensitive core body is provided with a cable, when the tension of a rope is transmitted to the resonator, the resonator can generate frequency change accurately corresponding to the tension, accurate capture of tiny tension change can be achieved, and compared with a traditional detection device, the detection device is high in measurement accuracy, can meet the scene requirement with the strict tension accuracy requirement, and is suitable for popularization and application. The technical problem that in the prior art, the mode of manually holding a force measuring instrument to test the main and auxiliary net ropes is not high in precision, and consequently the profile adjusting strategy is not accurate is solved.

The invention belongs to the technical field of bridge detection devices, and particularly relates to a wide bridge prestress detection device and method. A fixed frame is fixedly mounted on one side of the vibrating wire strain gauge, a storage groove for the rectangular plate to slide is formed in the fixed frame, a connecting block is fixedly mounted at the top of the rectangular plate, and a multi-stage telescopic plate is fixedly mounted on one surface of the connecting block; through the designed structure, rapid cleaning of a bridge installation area is achieved, meanwhile, the cleaning mechanism and the vibrating wire strain gauge are integrated, cleaning is convenient, meanwhile, carrying can be convenient, a worker does not need to additionally carry a cleaning tool, and the designed structure can be repeatedly and efficiently used. By cleaning the mounting area, when the vibrating wire strain gauge is used for mounting and detecting the prestress of the bridge, data can be accurately transmitted during subsequent detection, and data distortion is effectively avoided.

Embodiments according to the invention relate to a method (100), in particular for monitoring a mechanical stress acting on an inductive component (210). The method (100) comprises the step of detecting (110) one or more mechanical-stress-dependent measurement variables when applying an electrical excitation signal at the inductive component (210). The method (100) also involves determining (120) the mechanical stress acting on the inductive component (210) based on the one or more detected measurement variables.

The invention relates to the technical field of MEMS microsensors, in particular to a micro-resonance pressure sensor with an adjustable quality factor, which comprises a sensor body, the sensor body comprises a sensor base, the outer wall of the top of the sensor base is fixedly connected with a TO tube socket, the outer wall of the top of the TO tube socket is fixedly connected with a lower polar plate, and the lower polar plate is fixedly connected with an upper polar plate. A pressure sensitive film is fixedly connected to the inner wall of the lower pole plate, an upper pole plate is arranged at the top of the lower pole plate, a harmonic oscillator is fixedly connected to the inner wall of the side, close to the lower pole plate, of the upper pole plate, a detection mechanism is arranged on one side of the sensor body, and feedback voltage for counteracting air damping force can be generated through the detection mechanism. Therefore, the vibration state of the harmonic oscillator is actively regulated and controlled, the dynamic characteristics of the sensor body are allowed to be optimized according to different measurement requirements, and the applicability and performance of the sensor body under different working conditions are enhanced.