483 results about "Stress sensor" patented technology

The invention discloses a device for testing the mechanical properties of a pile-soil contact surface. The device is composed of a sealed pressure chamber, a hollow cylindrical soil sample, a solid cylindrical concrete pile sample and the like. The pile sample is prefabricated, and its diameter is equal to the internal diameter of the hollow cylindrical soil sample, and the two samples joint together closely. The lower end of the concrete pile sample is disposed on a pedestal through a spring assembly, and the upper end is connected to a stress loading system through a dowel bar, which is provided with a stress sensor and a displacement sensor I. The outside of the concrete pile sample is the hollow cylindrical soil sample. Filter paper and permeable stones are disposed at the lower end of the soil sample, and the lower end is positioned on the pedestal, while the upper end of the soil sample is provided with filter paper, permeable stones, a top cover and a displacement sensor II in order. During test, a confining pressure is exerted first for consolidating, and then a static (dynamic) load is exerted on the pile sample for measuring the axial deformation, pore water stress and the like of the pile and the soil. The device provided in the invention has a simple structure, is easy to realize, and can be used to measure the mechanical properties of a pile-soil contact surface under the action of a static (dynamic) load.

A device for measuring elastic properties, comprising a long bar-like probe base (42) and probes (50a, 50c) fitted to the probe base (42) driven as to be pressed against and withdrawn from a living body tissue. The probes are so formed that generally semi-spherical contact balls (58) having stress detection bases (56) are fitted to the ends of leaf strings (52) and stress detection sensors (60) are disposed on the stress detection bases (56). Light-receiving elements are fitted to the opposite side of the leaf displacement sensors (62a, 62b). The stress sensors (60) and displacement sensors (62a, 62b) are connected to the device body through signal lines (92, 94), respectively. The profile of the displacement of the tissue is calculated and displayed in a manner indicating correlation with stress.

A new family of multifunctional smart coatings based on of stabilized diamond-like metal-carbon atomic scale composites and diamond-like atomic-scale composite (DL ASC) materials. Based on a unique combination of the coating fine structure, properties of the coating/substrate interface, and the mechanical and electrical properties of the coating, the disclosed smart coatings would integrate various high resolution sensors and interconnections, and the sensor would diagnose dangerous stress distribution in the coated subject with no distortion in real time, while these diamond-like coatings would simultaneously provide environmental protection of the coated surface and improve its aerodynamic quality.

Assemblies are provided comprising a stent and a sensor positioned on and/or in the stent. Within certain aspects the sensors are wireless sensors, and include for example one or more fluid pressure sensors, contact sensors, position sensors, accelerometers, pulse pressure sensors, blood volume sensors, blood flow sensors, blood chemistry sensors, blood metabolic sensors, mechanical stress sensors and/or temperature sensors. Within certain aspects these stents may be utilized to assist in stent placement, monitor stent function, identify complications of stent treatment, monitor physiologic parameters and/or medically image a body passageway, e.g., a vascular lumen.

The invention relates to a concrete multi-factor durability test device under the common effect of tensile stress and environment, wherein, the lower part of a pull rod (8) is connected with a lower pull plate (13), the upper part of the pull rod (8) penetrates an upper pull plate (7) and a limit plate (4), the upper pull plate (7) is penetrated on the pull rod (8) to be fixed by a lock nut (6), a screw cap (2) presses a stress sensor (3) on the limit plate by a spherical screw rod (1), a spring (5) is sheathed on the spherical screw rod (1) and is positioned between the limit plate and the upper pull plate, an upper stretching chuck (91) and a lower stretching chuck (92) are arranged between the upper pull plate and the lower pull plate (13), the upper stretching chuck (91) is connected with the spherical head part of the spherical screw rod (1), the lower stretching chuck (92) is connected with the spherical head part of a spherical pull rod (12), a dumbbell-shaped concrete sample (10) is positioned between the upper stretching chuck (91) and the lower stretching chuck (92), the dumbbell-shaped concrete sample is held by the stretching chucks, both sides of the dumbbell-shaped concrete sample (10) are provided with constant force holding instruments (11), and the constant force holding instruments are connected with a non-metallic ultrasonic testing instrument (14).

A microengineered optical scanner based on a moving cantilevered dielectric waveguide is described. The waveguide is excited into resonant mechanical motion by a drive located at its root. Stress sensors detect the bending of the waveguide, allowing closed loop control of the motion. A moving image of the light emitted from the moving tip of the waveguide is created by a lens. The moving image acts as a scan line. Light back-scattered from a rough surface placed at the image plane is collected back into the waveguide by confocal imaging. The light collected in the cladding of the waveguide has higher numerical aperture than the light collected in the core. The cladding light is detected by a mode-stripping detector. Techniques for combining a cantilevered waveguide, a drive, motion sensors and a mode-stripping detector using microelectromechanical systems (MEMS) technology are described.

The invention discloses a stress sensor calibration system, which comprises a stress tester, a stress sensor and a secondary instrument, wherein the stress tester comprises a base, a lever bracket, a lever, a weight loading mechanism, an upper clamp and a lower clamp. The stress tester of the stress sensor calibration system applies a force by using a weight and provides a standard reference value of the stress by weight magnitude conversion; loading, unloading and loading protection of the stress tester are realized by adjusting the weight, and the stress of a tested piece is constant once the weight is determined, so the force value measurement precision is high; meanwhile, the lever pivot of the stress tester is a bearing and has strong bearing capacity, the upper clamp is hinged with the lever, and the lower clamp is hinged with the base, so that the pull and the pressure of the tested piece are on the same straight line, and the accuracy of the measured force value can be furtherensured; therefore, the stress sensor calibration system can accurately calibrate the output value of a sensor, and has high calibration precision.

The invention discloses a dynamic compaction ground stabilization reinforcement processing system. The dynamic compaction ground stabilization reinforcement processing system comprises a dynamic compactor and a winding engine. The dynamic compactor comprises a rammer tripping gear, a rammer hook and a rammer. The winding engine comprises an arm head pulley, a rammer raising steel wire rope which is connected with the winding engine, a pulley, a dynamic compactor mast, a rammer raising steel wire rope which is connected with the hook and a fixed nut. The dynamic compaction ground stabilization reinforcement processing system further comprises a dynamic compaction real-time diagnosis device. The dynamic compactor further comprises a contact stress sensor. The winding engine further comprises a rammer subsidence quantity sensor. The pulley used for the winding engine is a sensor pulley. The dynamic compaction ground stabilization reinforcement processing system can record dynamic compaction working data in real time in the whole process, timely process the data, work out diagnosis along with rammer, and evaluate reinforcement effect. Used as a black box in the process of construction, the dynamic compaction ground stabilization reinforcement processing system can achieve seamless supervise, reduce construction cost, shorten construction period and guarantee 24-hour barrier-free construction.

The invention discloses portable spontaneous imbibition measuring device which comprises a drying chamber and a measuring chamber, wherein a temperature sensor I and a heating device I are arranged in the drying chamber, and a ventilation opening is formed in the side wall of the drying chamber; a temperature sensor II and a heating device II are arranged in the measuring chamber, and a weighing module is further arranged at the bottom of the measuring chamber; a stress sensor and a container rack are arranged in the weighing module and at the bottom of the measuring chamber, and the container rack is arranged above the stress sensor and is not contacted with the stress sensor; a container is fixed on the container rack; a rock sample suspension rack is arranged on the stress sensor, and a suspension rope is suspended on the rock sample suspension rack, is used for suspending a to-be-measured rock sample and extends deeply in the container; and the stress sensor is connected with a signal output end. The portable spontaneous imbibition measuring device can measure change relationship of the quality of a fracturing fluid absorbed by the rock sample at constant temperature and normal pressure over time, so that technical indexes such as the water absorption rate, capillary force, water absorption quantity and the like of the rock sample can be known from research of the spontaneous imbibition.

The invention discloses a method of manufacturing a flexible micro membrane surface stress biosensor based on a nano conductive material. Particularly, a simple method is used for combining the nano conductive material and a flexible substrate, and the sensitivity and the telescopic performance of the stress sensor are further improved. Firstly, a flexible material (such as PDMS) is used as a raw material to make a flexible template with a groove; then, the nano conductive material (such as carbon nanotubes or silver nanowires) is used for filling the groove in the template; electrodes are led out from two ends of the filled nano conductive material; and finally, a flexible polymer material (such as PDMS) is used for fixing the nano material and the electrodes at the upper layer, and the structure stability is enhanced (the step can be omitted according to actual demands). The method of the invention has the advantages that the process is simple; the cost is low; the controllability is strong; the manufactured flexible stress sensor based on the nano conductive material is high in sensitivity, high in stability and good in flexibility; and possibilities are provided for realizing miniaturization, low cost and batch production.

The invention discloses a stress sensor based electronic device functional profile feature point displacement field reconstruction method. The method includes: determining a structural parameter and a material attribute of an electronic device functional profile and distribution positions and the number of stress sensors; acquiring a stress value measured by functional profile stress sensors under the action of service loads; establishing a structural finite element model of a functional profile; performing modal analysis on the functional profile; acquiring a modal shape and a stress modal shape of the functional profile; extracting a stress modal shape matrix corresponding to position nodes of the stress sensors; calculating a generalized modal coordinate; extracting a modal shape matrix corresponding to feature points of the functional profile; and reconstructing displacement of the feature points of the functional profile. Based on a modal analysis theory, the method can use stress values measured by the few stress sensors to reconstruct a displacement field of the feature points of the electronic device functional profile in the condition of unknown structural load information, and can direct structural distortion compensation and electrical performance compensation of the electronic device functional profile.

A sort of equipment with keyboard-inputting function and the inputting method, the structure has one supporting body which carries multiple make-and-break keys, the supporting body can balance and transfer the power or effect received at the keys, the supporting body itself is supported, have a stress sensor which can reflect the continuous variation of the stress it receives; the signal processing line can summarize or dispose the stress signal, get the value of bearing force or the largest value or the increased value when the key is hit, at the same time according to the switch-signal produced by the corresponding key, following the prearrangement confirms the corresponding information, every time it can input different information by hitting the same key.

The invention belongs to the field of foundation pit engineering, and provides a super deep underground diaphragm wall deformation automatic real-time monitoring device and an operating method thereof. The monitoring device comprises a fiber grating reinforced stress sensor, a fiber grating concrete strain sensor, a denoising analyzing device and an automatic deformation recognizing device. By the aid of the monitoring device and the operating method thereof, horizontal deformation of an underground diaphragm wall can be tracked and monitored in real time, deforming data can be automatically collected and analyzed, real-time capacity, continuity, effectiveness and reliability of monitoring can be guaranteed, processing efficiency of monitoring data of horizontal deformation of the underground diaphragm wall can be improved, and information sharing level of monitoring data of horizontal deformation of the underground diaphragm wall can be raised, the deformation of foundation pits is guaranteed in a controllable range, constructing risks of deep foundation pits can be reduced, and references can be provided for similar foundation pit engineering.

The invention belongs to a simple method for various creepage tests and a device thereof. According to the method, an experiment environment in which an experiment material is positioned and a device for applying pressure to the experiment material are arranged in separated spaces; the device for applying the pressure is a mechanically manual pressure applying adjustment device; force is loaded to a loading lever through a weight; the loading force is transmitted to a force transmission rod through a loading force application point by the loading lever; a pressure head on the force transmission rod applies pressure to the experiment material for experiment; a stress sensor and a displacement sensor are used for acquiring experiment data in real time and the experiment data are transmitted into a computer through a data wire; system software is used for processing the data and drawing a creepage curve. The device consists of an experiment box, an operating platform and the pressure applying adjustment device. The method disclosed by the invention can be suitable for long-time experiment, and guarantees the creepage test precision and the test running cost can be greatly lowered. The device has the advantages of simple structure, low manufacturing cost, convenience in operation and maintenance, high loading stabilization precision, low experiment cost and good effect.

The invention relates to a dynamic concrete stress sensor and a calibrating method based on piezoelectric ceramics. The sensor comprises piezoelectric ceramic sheets subject to waterproof insulation processing, shielded conductors, a connector and two capsulation force transmission blocks; a groove is arranged at the middle part of each of the opposite sides of the two capsulation force transmission blocks; the piezoelectric ceramic sheets are arranged in the grooves; the two capsulation force transmission blocks are bonded and fixed with the piezoelectric ceramic sheets into a whole through epoxy resin mixed with dry cement powder with the weight percentage of 6-14%; and the piezoelectric ceramic sheets are connected with the connector through the shielded conductors. The invention further comprises the dynamic concrete stress sensor calibrating method and an internal dynamic stress measurement system for a concrete structure using the dynamic concrete stress sensor. The dynamic stress sensor and calibrating equipment are simple in structure; the dynamic stress sensor is small in size; the manufacture technology is simple and convenient; the cost performance is high; and the sensor is suitable for volume production.

The present invention provides a pressure sensing device that includes at least one TMR sensor, and preferably an array of TMR sensors, with each TMR sensor having an insulating spacer layer interposed between a pinned and a free ferromagnetic layer. In an unbiased state, the magnetization vector of each of the ferromagnetic layers is preferably parallel to each other. Upon application of a small voltage, the magnetization vectors remain unchanged. Upon application of stress, the magnetization vector of the free magnetic layer will rotate, thus causing a corresponding and proportionally related change in the resistance of the sensor. This change in resistance can be sensed and used to calculate the stress applied thereto.

The invention discloses an all-in-one machine for testing soil engineering tension-compression strength. The all-in-one machine comprises a control console, wherein a driving wheel and a control device are arranged at one side of the control console; fixed rods are mounted at the two sides of the upper end face of the control console in a mirror image manner; a positioning rod is arranged between the upper ends of the fixed rods; the positioning rod and the fixed rods are rotatably connected and fixed by bolts; a locking nut is arranged in the middle of the positioning rod; a screw hole of the locking nut is internally provided with a screw rod which is rotatably connected and matched with the screw hole; the lower end of the screw rod penetrates through the positioning rod to be connected with an S-shaped tension-compression stress sensor; an upper universal footstock is mounted at the bottom of the S-shaped tension-compression stress sensor; a displacement measurement platform is arranged on the upper end face of the control console. The all-in-one machine can be used for researching the influences of speeds on tensile and compressive strength of a soil body; in a direct tensile test, the deformation amount of the soil body can be accurately determined; meanwhile, a gravity sensor can be used for measuring the change of gravity in a testing process; the all-in-one machine can be used for acquiring data which are rapidly changed in the test and cannot be observed by naked eyes.

A device for simulating visual gap seepage by magnetic fluid comprises a main body framework, wherein a camera is arranged in the main body framework and is hinged with a mobile auxiliary framework bya top universal ball on the main body framework, a visual rock sample is placed on an upper surface of a shearing counter-force rack by an expansion pressurization pad and comprises upper cover platetransparent resin and a conventional rock sample, a gap is formed between the upper cover plate transparent resin and the conventional rock sample, two side surfaces of the visual rock sample are connected with an inner side wall of the shearing counter-force rack by a hydraulic rod loading device, a stress sensor and a displacement sensor are arranged at the hydraulic rod loading device, and a paste/water injection pipe of a paste/water injection device is matched with the gap between the upper cover plate transparent resin and the conventional rock sample. With the device and method for simulating visual gap seepage by magnetic fluid, provided by the invention, the seepage rules under various conditions are researched by the magnetic fluid to simulate gap seepage conditions under conditions of multi-angle different confining pressure and yawing forces.

The invention belongs to the field of power system overhead transmission line tower safety monitoring, and provides a transmission tower online safety monitoring system and method for stress measuring. Firstly, stress sensors are installed on the key parts of a tower, and installation points can be obtained through finite element analysis and load application. Measurement values of the stress sensors are transmitted to a background server through the internet, the background server works out the reliability of each section of main material in real time according to each group of data together with the mean value and the variance of the strength of steel materials, and therefore the overall reliability of the tower can be obtained. The transmission tower online safety monitoring system and method have the following advantages that the problem of real-time tower stress monitoring is solved, and the stress distribution situations of the key parts can be monitored in real time; the safety state of the tower can be estimated in real time and serious accidents such as collapse can be effectively prevented under severe working conditions; research results are wide in application and can be directly applied to various tower shapes.

The invention discloses a quasi-distributed optical fiber temperature and stress sensor for multiplexing an F-P (Fabry-Perot) interferometer based on a low-reflectivity FBG (Fiber Bragg Grating). A sensing unit is an F-P resonant cavity consisting of two FBGs; a broadband light source is connected with a sensing optical fiber through a circulator; a plurality of sensing units can be carved on an optical fiber as required; the other end of the circulator is connected with a spectrum analyzer; and a result detected by the spectrum analyzer is output to a computer for analyzing and demodulating. The sensor has high measuring anti-jamming capacity, high reliability and sensitivity, a simple structure and a wide application prospect.

The invention provides a sensor for detecting weak stress. The stress sensor comprises a supporting housing, and an inductive coil positioned in the supporting housing; the supporting housing comprises a flexible supporting surface; a flexible bulge is connected to be above the flexible supporting surface; a magnetic field unit for providing a magnetic field to the inductive coil is connected to be below the flexible supporting surface; when in a working state, the outside weak stress acts on the flexible bulge, the flexible bulge generates pressure to drive the flexible supporting surface to deform to enable the change of a magnetic flux of the magnetic field unit on the inductive coil, and then the coil impedance changes and outputted from two ends of the coil, so that the outside weak stress straining can be detected, such as the pressure generated by the pulse fluctuating, air flow impacting or voice volume caused vibrating. The stress sensor has the advantages of being simple in structure, low in cost and high in sensitivity, and has a good application prospect.