96 results about "Resistive sensors" patented technology

The subject invention is concerned with systems and methods advantageously applying finite element analysis to establish design rules for a highly sensitive piezo-resistive pressure sensor with an output that is high enough to be detectable by simple and inexpensive circuits and therefore ensure wearability. Four frequently reported micro-feature shapes in micro-patterned piezo-resistive sensors are provided, where the micro-dome and micro-pyramid yield the highest sensitivity. Investigations of different conductivity values of micro-patterned elastomers show that coating the elastomer with a conductive material (e.g., a metallic coating) leads to higher current response when compared to composited conductive elastomers. Advantageous geometric parameters and spatial configurations of micro-pyramid design of piezo-resistive sensors are provided. Results show that an enhanced sensitivity and higher current output can be achieved by a lower spatial density configuration of three micro-features per millimeter length, a smaller feature size of around 100 μm, and a 60-50 degrees pyramid angle.

The invention discloses a gas-sensitive material for monitoring an environment-friendly gas characteristic substance CO as well as a preparation method and application thereof, and relates to the technical field of gas-sensitive materials. The preparation method comprises the following steps: dissolving tin tetrachloride pentahydrate, sodium hydroxide and polyvinylpyrrolidone, adding ammonium fluoride, reacting at 155-165 DEG C, drying the product, and calcining at 295-305 DEG C to obtain SnO2 nanoparticles; the preparation method comprises the following steps: performing ultrasonic mixing on SnO2 deionized water dispersion liquid and MoS2 nanosheet ethylene glycol dispersion liquid, and then drying to obtain the MoS2 / SnO2 composite material with a mesoporous hollow nanotube structure, and the volume ratio of ethylene glycol to deionized water is (0.9-1.1): 1. The MoS2 / SnO2 gas sensitive material has the advantages of low density, high pore volume, large specific surface area, high structural stability and the like. And when applied to a CO resistive sensor, the catalyst has good CO selectivity, high sensitivity and good long-term stability.

An example system for passive sensing includes a coupled pair of resonators including a sensor resonator and a reader resonator, the sensor resonator including a resistor a loss associated with the resistor, and the reader resonator including a MOS cross-coupled pair that implements a nonlinear gain of the reader resonator via compressive saturation of negative resistance. An amplitude detector measures the amplitude of oscillations associated with the reader resonator, and the negative resistance is determined based on the measured amplitude of oscillations associated with the reader resonator when the measured amplitude reaches a steady state, i.e., when the gain of the reader resonator balances the loss of the sensor resonator. The resistance associated with the resistor of the sensor resonator may be determined based on the determined negative resistance. When the resistor is a resistive sensor, indications of measurements by the resistive sensor may be determined in this way.

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.

The subject invention is concerned with systems and methods advantageously applying finite element analysis to establish design rules for a highly sensitive piezo-resistive pressure sensor with an output that is high enough to be detectable by simple and inexpensive circuits and therefore ensure wearability. Four frequently reported micro-feature shapes in micro-patterned piezo-resistive sensors are provided, where the micro-dome and micro-pyramid yield the highest sensitivity. Investigations of different conductivity values of micro-patterned elastomers show that coating the elastomer with a conductive material (e.g., a metallic coating) leads to higher current response when compared to composited conductive elastomers. Advantageous geometric parameters and spatial configurations of micro-pyramid design of piezo-resistive sensors are provided. Results show that an enhanced sensitivity and higher current output can be achieved by a lower spatial density configuration of three micro-features per millimeter length, a smaller feature size of around 100 μm, and a 60-50 degrees pyramid angle.

Disclosed is a hydrocarbon leak detection cable that locates hydrocarbon leaks in oil pipelines, gas pipelines, oil and gas tanks, and other devices that store and transport hydrocarbons. Resistive sensor wires are used so that the location of the leak can be detected with a high degree of accuracy in an inexpensive and convenient matter. In addition, hydrocarbon leaks can be detected over long distances, which reduces the cost and provides reliability for detecting hydrocarbon leaks in hydrocarbon pipelines.

The invention belongs to the technical field of gas sensors, and particularly relates to a dimethyl disulfide gas sensor based on a porous Cr2O3 nano material and a preparation method of the dimethyl disulfide gas sensor. The porous Cr2O3 nano material is used as the sensitive material of the dimethyl disulfide gas sensor for the first time, and the resistance-type dimethyl disulfide gas sensor with excellent performance is constructed. The sensor fully utilizes the advantages of high sensitivity, low cost, simple device, easy integration and easy on-site continuous detection of a semiconductor resistance-type sensing material and the characteristics of high response to dimethyl disulfide and excellent selectivity of Cr2O3, and constructs the resistance-type sensor which is sensitive in response to dimethyl disulfide, good in selectivity, low in working temperature, economical and environment-friendly. Meanwhile, a good sensitive material is found for a dimethyl disulfide gas sensor, and a new application field is developed for Cr2O3.

The invention provides a two-dimensional resistive sensor array suitable for measurement in a high-temperature environment, and belongs to the technical field of sensors, the resistive sensor array comprises a substrate, an array circuit and an insulation protection layer, the array circuit comprises a front sensor array and a back terminal circuit, the front sensor array comprises a transverse wire, a longitudinal wire, a sensor unit and a node insulating layer, the sensor unit is a dual-electrode sensor, electrodes at the two ends of the sensor unit are connected with the transverse wire and the longitudinal wire respectively, the node insulating layer is used for insulating the crossed part of the transverse wire and the longitudinal wire, and the resistance type sensor array is a thick film or thin film circuit; the number of external connection ports can be greatly reduced while a large number of two-dimensional distribution physical parameter fields are measured, measurement under various high-temperature, high-pressure and high-vibration severe environments can be achieved through the manufacturing material and the packaging technology, and the influence caused by invasion of a measured object is reduced to the maximum extent.

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.

A habit-training device employing a force-resistive sensor for subject detection is disclosed, including a mat including one or more sensors to determine the presence of a child-weight individual in an environment. A speaker is provided in an environment to emit an audible cue to the child-weight individual, the audible cue to provide a reminder to perform a habit.

A measuring device (100) comprises: 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 where 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), where each second end of the N resistive sensors is connected via one of the N switches either to be potential-free or to reference ground or to reference voltage (VDD); and a control unit (40) configured to individually switch the second ends of the N resistive sensors to be potential-free, to reference ground, or to reference voltage (VDD).

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 invention discloses a preparation method and application of a flexible wearable wireless data glove. The invention belongs to the technical field of printing electronics. The invention aims to solve the technical problem that the conventional wireless data glove is not light and not easy to fit. The method comprises the following steps: preparing three kinds of liquid metal ink with different polymeric dispersant contents; the three kinds of liquid metal ink are printed on a flexible substrate, then pulsed light sintering is conducted, and a bending sensor, a pressure sensor and a transmission circuit are obtained; and packaging is carried out by adopting a flexible material after assembly. Liquid metal ink with different polymeric dispersant contents is printed and then subjected to light sintering to serve as a circuit, a bending sensor and a pressure sensor, the prepared glove can distinguish the types of the sensors by obtaining basic resistance, then the resistance change rate is calculated based on the principle of a resistance type sensor, then the actual situation is fitted, and the accuracy of the glove is improved. Wanted data is obtained or simulation of actions is completed in VR.

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.

An apparatus is provided for enabling smokable material to be heated to volatize at least one component of the smokable material. In one example, the apparatus has a capacitive sensor arranged to sense a change in capacitance when an article of smokable material is associated with a housing of the apparatus in use. In another example, the apparatus has a resistive sensor arranged to provide a measure of electrical resistance when an article of smokable material is associated with a housing of the apparatus in use. A combination of capacitive and resistive sensing may be used in some examples. In another example, a sensor makes use of at least two different sensing techniques.

A sensor interface for a resistive sensor has an analog front end comprising. The analog front end has an analog input / output (I / O) sensor port to be coupled to the resistive sensor. An integration stage is coupled to the analog I / O sensor port to oscillate at an oscillation frequency proportional to a sensor resistance of the resistive sensor. The integration stage has a variable integrator capacitance to vary the oscillation frequency. A gain stage is coupled to the integration stage and has a variable gain to vary the oscillation frequency of the integration stage. The sensor interface also has a smart digital controller (SDC) coupled to the analog front end to compute the sensor resistance of the resistive sensor based on the oscillation frequency. In addition, the SDC automatically detects unstable oscillation in the integration stage and causes the variable gain and the variable integrator capacitance to change.

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.