66 results about "Resistive sensors" patented technology

The application discloses a kind of based on transparent soil and pile-soil interface micro evolution measurement method of multi-source sensing, it is related to geotechnical engineering test field.The present application includes the following steps: constructing transparent soil model, pile body pre-embedded sensor arrangement, multi-source sensor calibration and parameter optimization, load application and multi-source data acquisition, improved DIC algorithm's pile-soil interface micro displacement calculation, pile-soil interface pore and particle density calculation, multi-source sensing data's heterogeneous fusion, pile-soil interface micro evolution characteristic quantitative inversion and visualization, test end and data verification.The present application simulates real soil environment by constructing transparent soil model, in combination with image recognition, digital image correlation, fiber-optic sensing and resistance sensor and other multi-source sensing technology, the micro deformation, stress distribution and failure evolution process of pile-soil interface in loading process are monitored and analyzed in real time with high precision, realize the high-precision, full-process, visual measurement of pile-soil interface micro evolution, improve measurement precision.

An apparatus is provided. The apparatus includes a first resistor stack having a first temperature coefficient. The apparatus also includes a second resistor stack coupled to the first resistor stack having a second temperature coefficient different than the first temperature coefficient. The apparatus further includes a measurement circuit associated configured to determine a temperature of the apparatus based on a differential between a first voltage across the first resistor stack and a second voltage across the second resistor stack and determine a set of resistances of a field-effect transistor (FET) that is coupled to the apparatus based on additional differentials between additional voltages across the first resistor stack and the second resistor stack.

The utility model provides a precise resistive sensor temperature measurement circuit and device, and relates to the technical field of temperature measurement circuits, through setting a proportional amplifier, ADC voltage at an output end of the proportional amplifier is only associated with a matching resistor (fixed resistance value) of a resistive temperature measurement sensor and a feedback resistor arranged in the proportional amplifier, so that the temperature measurement precision is improved. Therefore, the resistance value of the resistive temperature measurement sensor can be reversely calculated according to the collected ADC voltage, and the temperature of the current test point can be reflected according to the resistance value comparison table, which is irrelevant to the resistance value of the cable, so that the problem of inaccurate accuracy caused by long distance of the test temperature point is solved.

The invention belongs to the technical field of flexible sensing, and particularly relates to a tensile transparent resistive sensor and a preparation method thereof. The sensor is composed of an elastic substrate and gradient conductive layers, the conductive layers I and II are metal nanowire grids, the conductive layer III is a PEDOT: PSS / metal nanowire composite layer, the three layers form a gradient conductive network on the rigid substrate through a layer-by-layer coating process, and then the gradient conductive network is integrally transferred to the surface of the elastic substrate through a freezing auxiliary transfer printing technology. And forming an interlayer interpenetrating stretchable transparent conductive structure. After the structure is circularly stretched for 100 times under 50% strain, the resistance change rate is less than or equal to 7%, the light transmittance at 550 nm is more than or equal to 85%, the sheet resistance is as low as 16 omega / sq, and the structure has high sensitivity (the detection limit is less than or equal to 5% strain), high light transmittance and excellent cycle stability. The preparation method adopts an all-solution process, is low in cost, can realize large-area preparation, and is suitable for the fields of wearable electronics, health monitoring, human-computer interaction and the like.

A manufacturing method for a magneto resistive sensor includes a first magnetization step for magnetizing a first area of an antiferromagnetic layer by applying a magnetic field in a first magnetization direction and irradiating the first area with a laser beam, and a second magnetization step for magnetizing a second area of the antiferromagnetic layer, the second area not overlapping the first area, after the first magnetization step by applying a magnetic field in a second magnetization direction that differs from the first magnetization direction and irradiating the second area with the laser beam.

The invention discloses a flexible resistive sensor based on gallium-based liquid metal and application thereof, the flexible resistive sensor comprises an upper PDMS substrate and a lower PDMS substrate, and the upper PDMS substrate and the lower PDMS substrate are provided with micro-channels; the micro-channel is filled with gallium-based liquid metal, and the gallium-based liquid metal is gallium-indium-tin alloy; when the sensor is used as a touch sensor, the sensor is provided with four fingerprint-shaped micro-channels which are symmetrically distributed on long and short axes of an ellipse, and the design of a Wheatstone bridge circuit is combined, so that pressure and temperature signals can be effectively decoupled, and high-precision pressure detection and independent temperature sensing are realized; when being used as a strain sensor, the strain sensor is provided with a snakelike micro-channel. The sensor has excellent flexibility, ductility and wear resistance, high-precision detection of pressure and temperature can be achieved, the bending angle of the finger joint can be monitored synchronously, the working performance is stable, and the dynamic range is wide; the method has obvious effects in object texture identification and finger motion state detection, and has important application value in flexible robots, intelligent prostheses and wearable intelligent devices.

According to an embodiment, a biasing circuit includes a high impedance bias stage coupled to sensor pads connected to a resistive sensor for detecting fly height in a hard disk drive. The circuit employs dual operational transconductance amplifiers with different bandwidths working in conjunction with switching circuitry to establish and maintain bias conditions. A first operational transconductance amplifier with a higher bandwidth provides fast initial settling, while a second operational transconductance amplifier with a lower bandwidth optimizes continuous operation. The architecture supports multiple operating modes, including differential voltage, differential current, and common mode configurations, through various arrangements of transistors, compensation capacitors, and feedback paths.

Devices, systems, and methods for assessing contact between a treatment element and an area of target tissue using resistive-type and / or capacitive-type contact sensing elements. In one embodiment, a medical system for determining tissue contact includes an elongate body including a distal portion and a proximal portion and a treatment element coupled to the elongate body distal portion. The treatment element may have a first expandable element, a second expandable element, the first expandable element being within the second expandable element, and at least one contact sensing element between the first and second expandable elements. In one example, the device may include a plurality of contact sensing elements arranged in a matrix or in a plurality of linear configurations. In another example, the device may include a layer of conductive microparticles or a contact-sensing film.

To reduce an increase in the burden of designing circuits used in a pen pressure sensor, provided is a stylus including a detection circuit that is connectable to a pen pressure sensor that, in operation, acquires pen pressure data of the stylus, the pen pressure sensor being a capacitive sensor in which a capacitance value changes according to applied force or a resistive sensor in which a resistance value changes according to applied force, the detection circuit can selectively operating in a first mode and a second mode, the detection circuit, in operation, acquiring the pen pressure data based on the capacitance value of the pen pressure sensor while the detection circuit operates in the first mode, and the detection circuit, in operation, acquiring the pen pressure data in reference to the resistance value of the pen pressure sensor while the detection circuit operates in the second mode.

The invention relates to the technical field of buried pipeline state detection, and discloses a buried pipeline state detection device and method.The buried pipeline state detection device comprises an RFID sensing assembly which comprises an RFID tag and a resistive sensor, and the resistive sensor is used for collecting state information of a buried pipeline; the fixing device is used for respectively fixing the plurality of RFID sensing assemblies at different positions of the buried pipeline; the detection terminal comprises a positioning device, an RFID tag reader and a data processing terminal, the positioning device is used for acquiring positioning information of the detection terminal, the RFID tag reader is used for exciting the RFID sensing assembly and acquiring detection information, and the data processing terminal is used for constructing a three-dimensional space model of the buried pipeline based on the coordinate information and the positioning information. According to the method, the service state of the buried pipeline in the operation period can be accurately obtained, and normalized low-cost detection is achieved.

The present invention discloses a gas-sensitive material for monitoring the characteristic substance CO of environmental protection gas, a preparation method and an application, which relate to the technical field of gas-sensitive materials. The preparation method includes: dissolving tin tetrachloride pentahydrate, sodium hydroxide and polyvinylpyrrolidone, adding ammonium fluoride, reacting at 155 °C to 165 °C, and calcining the product at 295 °C to 305 °C after drying to obtain SnO2 nanoparticles; ultrasonically mixing the deionized water dispersion of SnO2 and the ethylene glycol dispersion of MoS2 nanosheets, and then drying to obtain a MoS2 / SnO2 composite material with a mesoporous hollow nanotube structure, wherein the volume ratio of ethylene glycol to deionized water is 0.9 to 1.1:1. The MoS2 / SnO2 gas-sensitive material of the present invention has the advantages of low density, high pore volume, large specific surface area, strong structural stability, etc. When applied to a CO resistive sensor, it has good selectivity for CO, high sensitivity, and good long-term stability.

The invention discloses a resistance-type sensing array signal acquisition system with a unit electrode sharing characteristic. The system comprises a resistance-type sensing array with the unit electrode sharing characteristic, an automatic point-by-point switch gating circuit, an excitation end circuit and a signal end circuit. Through the design of double groups of row and column scanning wires and the zero potential isolation circuit, current crosstalk caused by multi-path gating on the same wire of the resistive sensing array with a unit electrode sharing characteristic and adjacent resistor units among different wires is avoided, so that automatic point-by-point scanning of the sensing array can be realized; no external microprocessor or other control is needed, the integration level is high, the unit scanning rate is high, and power consumption is low.

The present embodiments relate to a free layer structure of a sensor (e.g., a tunneling magneto-resistive (TMR) sensor) with a non-magnetic layer deposited between free layers. For instance, a free layer structure can be created by inserting a subatomic non-magnetic layer with materials such as Tantalum (Ta) or Hafnium (Hf) between a first free layer and a second free layer. Inserting the non-magnetic layer can break the translation of the first free layer crystalline structure to the second free layer, thus making the second free layer more amorphous. The free layer structure can also include inserting an insertion layer before depositing a capping layer, which can reduce the influence of the capping layer crystalline structure to the free layer. Another example free layer structure can include inserting both the non-magnetic layer and the insertion layer to obtain a magnetically softer film.

The application relates to a sensing thermal type gas flow sensor MEMS chip end, a heating wire is located at a center symmetrical position of a heat insulation bridge; an adiabatic cavity is arranged at the bottom of the heat insulation bridge, the adiabatic cavity is connected with the heat insulation bridge at two ends in the vertical direction along the arrangement direction of the heating wire; the outside of the adiabatic cavity is a substrate; first and second temperature sensitive resistance type sensors are connected in series to form a half-arm Wheatstone bridge and are located at equidistant positions of two ends of the heating wire and on the heat insulation bridge; first and second BJT bipolar transistors are combined on the substrate on two sides of the adiabatic cavity along the arrangement direction of the central heating wire; and the distances from the heating wires are equal, they respectively include a first BJT transistor and a second BJT transistor and respectively include a third BJT transistor and a fourth BJT transistor. The disclosure uses a mathematical principle to convert a quadratic curve with constant curvature characteristics into a cubic curve with a curvature passing through 0 point characteristics to complete compensation. In the range of the scale, the curve is approximately a straight line.

The present invention provides a resistometric sensor for measuring environmental corrosivity and / or corrosion loss of a metal structure, the said sensor comprising a substrate (1), at least one metal sensing track (5; 5a, 5b) provided on the substrate (1), at least one metal reference track (4) provided on the substrate (1), and a masking layer (3) covering the at least one reference track (4), wherein the substrate (1) is made of a thermally conductive material, and wherein an electrically non-conductive insulating layer (2) is provided between the substrate (1) and the at least one metal sensing track (5; 5a, 5b) and between the substrate (1) and the at least one reference track (4) to electrically insulate the tracks (4, 5; 4, 5a, 5b) from the substrate (1). A method of measuring the environmental corrosivity and / or corrosion loss is also claimed.

The invention relates to the technical field of sensing circuits, and provides a high-performance front-end instrumentation amplifier circuit and a resistive sensing circuit, the high-performance front-end instrumentation amplifier circuit comprises a differential amplifier, a chopping modulation circuit, a ripple reduction loop and a pre-charging loop; the input end of the differential amplifier is connected to the resistive sensor, and the differential amplifier amplifies the input signal; the chopping modulation circuit is connected to the input end and the output end of the differential amplifier and is used for modulating and demodulating the input signal and the output signal; the ripple reduction loop is bridged between the chopping modulation circuit and the input end of the differential amplifier and is used for reducing output ripples caused by chopping modulation; and the pre-charging loop is bridged at the input end of the differential amplifier and is used for improving the input impedance. According to the technical scheme, flicker noise and direct current offset are effectively reduced, the influence of output ripples brought by chopping modulation is reduced, input impedance is improved, and completeness and effectiveness of signal acquisition are guaranteed.

We provide a construction verification device for ground improvement structures that allows for real-time confirmation of the improved structure. [Solution] This is a construction confirmation device 1 for a ground improvement body 7, which creates a ground improvement body 7 by high-pressure injection of a solidifying agent 4 from an injection pipe 3 inserted into the ground 2 around the injection pipe 3, and mixing the high-pressure injected solidifying agent 4 with the ground 2 to form an improved material 6. An inner pipe 9 is buried at a predetermined position away from the injection pipe 3, and multiple detection units 15 of an electrical resistance type sensor 11 for detecting the improved material 6 are provided in the inner pipe 9 at intervals along the length of the inner pipe 9. When the improved material 6 comes into contact with a detection unit 15, the electrical resistance value changes, and this change in electrical resistance value allows detection that the improved material 6 has reached a predetermined position away from the injection pipe 3. Furthermore, the height of the detection unit 15 that the improved material 6 has reached can be detected in real time by the multiple detection units 15.

The invention relates to a measuring device (100), comprising: a plurality of N resistive sensors (10-1, ...,10-6) each having a first end and a second end, where N is an even number greater than or equal to 2, and wherein each first end of the N resistive sensors is connected to a star point (101); an amplifier (20) comprising a first input (201) connected to the star point, a second input (202) and an output (203) for outputting a measurement signal (Vout); N switches (30-1, ...,30-6), wherein each second end of the N resistive sensors is optionally connected, via one of the N switches, in a potential-free manner or to reference earth or to reference voltage (VDD); and a control unit (40), which is designed to connect the second ends of the N resistive sensors individually in a potential-free manner, to reference earth or to reference voltage (VDD).

A low-noise room-temperature resistance NO2 sensor based on MoBT x / ZnO composite material and a preparation method thereof belong to the technical field of gas sensors. The sensor is composed of a polyimide substrate with a gold-nickel double-layer composite interdigital electrode and a MoBT x / ZnO composite material sensitive electrode prepared on the interdigital electrode and the substrate. The MoBT x MBene material is used as a matrix, two-dimensional ZnO is in-situ grown on the MoBT x sheet layer surface through a hydrothermal reaction, the MoBT x sheet layer is closely adhered to the ZnO sheet layer in a large area and forms a lattice coupling, thereby constructing a two-dimensional heterostructure which is continuous, penetrative and has rich edge active sites. The structure can increase the effective heterojunction interface area, enhance the interface modulation effect and significantly enhance the dissipation of disturbance energy. The structure is used as a sensitive material, thereby preparing a high-performance gas sensor. Experiments show that the sensor based on MoBT x / ZnO can inhibit the sensor noise from the root, has high selectivity, high response and low detection limit for NO2 at room temperature.

A kind of three-wire resistance measurement circuit and method based on double current source belong to resistance sensor measurement technical field.The present application is to solve the problem that existing three-wire measurement scheme cannot completely eliminate the influence of lead resistance and its temperature drift.The circuit of the present application includes a first current source, a second current source, a first measurement point, a second measurement point, a resistance temperature detector (RTD) and a measurement circuit. The first current source generates adjustable current and is connected to the first lead, the second current source generates adjustable current and is connected to the second lead, one end of the RTD is connected to the two current sources through the first and second leads respectively, and the other end is grounded through the third lead. The present application completely eliminates the influence of lead resistance and its temperature drift on measurement accuracy through double current source excitation and specific calculation, while retaining the advantage of simple three-wire connection, suitable for high-precision temperature monitoring.

To reduce an increase in the burden of designing circuits used in a pen pressure sensor, provided is a stylus including a detection circuit that is connectable to a pen pressure sensor that, in operation, acquires pen pressure data of the stylus, the pen pressure sensor being a capacitive sensor in which a capacitance value changes according to applied force or a resistive sensor in which a resistance value changes according to applied force, the detection circuit can selectively operating in a first mode and a second mode, the detection circuit, in operation, acquiring the pen pressure data based on the capacitance value of the pen pressure sensor while the detection circuit operates in the first mode, and the detection circuit, in operation, acquiring the pen pressure data in reference to the resistance value of the pen pressure sensor while the detection circuit operates in the second mode.

Thermal conductivity detector (1), in particular for the detection and, optionally, the quantification of a gaseous analyte within a gas, the detector comprising a resistive sensor (2) containing, or even consisting of, adamantine carbon.

Temperature sensor (40) for a battery cell (10) of a rechargeable battery, comprising: a resistive sensor element (46), a first electrode (42) and a second electrode (44); wherein the resistive sensor element (46), the first electrode (42) and the second electrode (44) are attached to a porous separator (20); wherein the porous separator (20) is arranged between an anode (12) and a cathode (14) of the battery cell (10); wherein the resistive sensor element (46) is electrically connected in series between the first electrode (42) and the second electrode (44); wherein the resistive sensor element (46), the first electrode (42) and the second electrode (44) are attached to the separator (20) by physical vapor deposition; and wherein the resistive sensor element (46), the first electrode (42) and the second electrode (44) are porous.

Apparatus for providing a sensing experience disclosing comprising: a hand‐held device housing a sensor configured to sense an environment and produce a corresponding sensor response; and a transducer configured to produce a corresponding auditory, hap c or visual output based on an input of the sensor response or a deriva ve thereof. The sensor may be an echosounder, a microphone, a capaci ve sensor, a resis ve sensor or some other suitable sensor. The hand‐held device may be elongate with the sensor being located at one end and a transducer such as a speaker or vibra on mechanism at the other.

The application discloses a kind of multi-step measurement method and test circuit of resistive sensor array, and the application is aimed at M×N two-dimensional resistive sensor array of common row line and column line;The test circuit includes: 1 inverting operational amplifier, 1 voltage follower, several row multiplexers, several column multiplexers.Resistive sensor array row line and column line can be accessed the output end of voltage follower by multiplexer, and the inverting input end of voltage follower can also be accessed the row line and column line of resistive sensor array by multiplexer.At the same time, resistive sensor array row line and column line can also be accessed the inverting input end of inverting operational amplifier by multiplexer, and the noninverting input end of inverting operational amplifier is grounded.Compared with prior art, the application can accurately measure the resistance value of any to-be-measured resistor in the array, and effectively eliminates the interference of crosstalk and switch-on resistance, while having strong anti-interference performance and simple structure.

The application relates to a transmitter, which comprises a corrugated base, a mounting groove is formed in the corrugated base, the mounting groove extends from one side of the corrugated base to the other side of the corrugated base, a joint is arranged in the corrugated base, a flow guide channel is arranged in the joint, the flow guide channel is communicated with the mounting groove, a strain resistance sensor comprises a sensor body, the sensor body is located at one end of the mounting groove away from the joint, a medium diaphragm is located at the communication position of the flow guide channel and the mounting groove, and the medium diaphragm is used for separating the flow guide channel and the mounting groove; a to-be-measured liquid passes through the joint, extrudes the medium diaphragm, the medium diaphragm transmits the pressure to the sensor body through the medium in a sealing cavity, and then the pressure value is measured; the medium is located between the medium diaphragm and the sensor body, the medium plays a heat insulation role, the "zero drift" phenomenon is relieved, and the application is suitable for a uranium enrichment engineering production line.

This invention relates to a protonated ketone cyanine polymer, its preparation method, and a low-humidity resistive sensor, belonging to the field of organic semiconductor device technology. The polymer has the following structural formula: where n is a positive integer, X is hydrogen or deuterium, and A... ‑ For Cl ‑ HSO4 ‑ H2PO4 ‑ The polymer can form a more complete hydrogen bond network under low humidity, which increases its sensitivity under low humidity. While maintaining a response over a wide humidity range of 11% to 95%, it improves its sensitivity in the low humidity range (11% to 33% RH). In addition, the ions introduced by protonation can interact with the π-conjugated system through anion-π interactions, increasing the stability of the polymer.

A clothes dryer and a drying control method therefor. The clothes dryer comprises a cabinet (20), a drum (30), an electric motor (32), a compressor (71), a fan (60), a resistive sensor (41), a capacitive sensor (42), and a processor (50), wherein the processor (50) is configured to execute a first drying task, which is configured to control the compressor (71) to operate at a first frequency, the fan (60) to operate, and the electric motor (32) to operate; when executing the first drying task, the processor (50) is further configured to control the duration of the running of the first drying task; the processor (50) is configured to execute a second drying task when a humidity value is less than a first threshold and the moisture content of the air is less than a second threshold, the second drying task being configured to control the compressor (71) to operate at a second frequency, the fan (60) to operate, and the electric motor (32) to operate continuously; and when executing the second drying task, the processor (50) is further configured to control the duration of the running of the second drying task.

The application discloses a kind of measurement method and system for improving the precision of differential resistance sensor, comprising: control constant current flows through reference resistance R S , differential resistance sensor resistance R1 and differential resistance sensor resistance R2;The voltage generated on reference resistance R S , differential resistance sensor resistance R1 and differential resistance sensor resistance R2 is introduced into instrument amplifier, and AD code value AD S , AD code value AD1 and AD code value AD2 are obtained using ADC converter;Using AD code value AD S , AD code value AD1 and AD code value AD2 calculate measurement parameter Z′;The measurement parameter Z′ is the difference between differential resistance sensor resistance R1 and differential resistance sensor resistance R2 is the sum of differential resistance sensor resistance R1 and differential resistance sensor resistance R2;Without changing the structure of existing differential resistance sensor, the sensitivity of the sensor is improved, and the linearity of the sensor is improved.