63 results about "Impedance sensing" patented technology

This disclosure describes systems, apparatuses, and methods that utilize electric field sensing in an antenna topology. In some embodiments, the systems, apparatuses, and methods use a sensing modality, such as bio-impedance sensing, to detect and / or determine one or more user activities. The bio-impedance sensing can be used for held-object or touched-object recognition, gesture input recognition (e.g., recognition of one-handed gestures, two-handed gestures, etc.), user interface (UI) interaction by utilizing electrically passive components, and / or biometric identification and / or authentication.

The invention relates to the technical field of intelligent warehouse logistics and industrial automation, in particular to a multi-AGV path planning method based on regional impedance perception and space-time dynamic coordination, and the method comprises the steps: obtaining grid map information and task information of each AGV based on a warehouse environment; constructing a local observation window taking the AGV as a central node, analyzing nodes covered by corresponding grid map information, determining a region passing impedance index, and constructing an obstacle distance penalty term; dynamically adjusting a heuristic function weight in an A * algorithm by adopting a regional passage impedance index, establishing an evaluation function in combination with an obstacle distance penalty term, and generating a single-machine global path; based on the task information of the AGV, generating a time window for each node in the global path, and judging the path conflict of the current storage environment through the time window; and a task priority strategy is preset, path conflicts are eliminated, and a cooperative scheduling instruction is generated to regulate and control the operation path of the AGV. And self-adaptive adjustment is performed by sensing the environment congestion degree, so that the search efficiency is improved.

Systems and methods for informing and evaluating neuromodulation therapy are disclosed herein. A system configured in accordance with embodiments of the present technology can include, for example, a guidewire having a proximal portion, a distal portion configured to be positioned at a target site in a blood vessel of a human patient, and a sensing element positioned along the distal portion. The sensing element can be a pressure sensing element, a flow sensing element, an impedance sensing element, and / or a temperature sensing element. The system can also include a controller configured to obtain one or more measurements related to a physiological parameter of the patient via the sensing element. Based on the measurements, the controller can determine the physiological parameter and compare the parameter to a predetermined threshold. Based on the comparison, the controller and / or an operator can evaluate the likelihood that the patient would benefit from neuromodulation therapy.

The invention provides a neurosurgery postoperative aspiration risk grading detection head band and a neurosurgery postoperative aspiration risk grading detection system based on impedance sensing, and relates to the technical field of medical detection, the neurosurgery postoperative aspiration risk grading detection head band comprises a band body, a flexible electrode array, a signal processing unit and a wireless transmission chip, the flexible electrode array is integrated on the inner side of the band body and is used for collecting biological impedance signals of anterior cervical muscle groups; the signal processing unit is electrically connected with the flexible electrode array and is used for preprocessing and demodulating the impedance signal; the wireless transmission chip is connected with the signal processing unit and is used for uploading the processed signal to the cloud control platform; the flexible electrode array is integrated on the belt body, non-invasive and comfortable continuous monitoring is achieved, the electrodes are attached to the curved surface of the anterior cervical muscle group, stimulation of traditional invasive electrodes to the skin is avoided, the belt body is designed through elastic spandex, use is convenient, the device adapts to the head circumference of different patients, and the comfort of long-term wearing is ensured.

The application discloses a precision hardware fatigue damage detection method and system, and relates to the field of precision mechanical detection.The method comprises the following steps: coupling a flexible impedance sensing array with a precision hardware to be detected; the array substrate is made of polydimethylsiloxane, and the surface array groove is filled with a conductive hydrophilic composite gel formed by in-situ polymerization of acrylamide monomer, sodium alginate and nanometer carbon fibers, thereby forming a plurality of miniaturized impedance units; a constant pressure is applied through a pressure feedback control system, so that the gel produces elastic deformation to cover and compensate the micron-level roughness of the surface of the detection area; a micro-amplitude sinusoidal voltage excitation is applied, current response data in the swept frequency band is collected, complex impedance information is extracted and fitted to a randall equivalent circuit model, and charge transfer resistance and interface capacitance values are obtained; and the parameter deviation degree is calculated according to the charge transfer resistance of the current detection period and historical reference, so as to determine the fatigue damage condition of the local area.

A catheter system for use with a catheter with a distal assembly supporting a plurality of electrodes adapted to sense electrical signal in heart tissue and a force sensor configured to generate first contact signals representative of a contact force acting on the distal assembly. The system includes an ablation power generator configured to energize the plurality of electrodes, an impedance circuitry configured to generate second contact signals representative of the electrodes in contact with tissue, a processor configured to receive the first and second contact signals and generate switch signals in response thereto, and a switch circuitry configured to connect in response to the switch signals solely selected electrodes in contact with tissue to the ablation power generator in forming one or more composite electrodes.

The invention discloses a double-stage impedance sensing, monitoring and diagnosing system and method for a multi-orifice piezoelectric sprayer, and belongs to the technical field of printers, the system collects driving voltage and loop current of corresponding orifices through a collection module during the period of applying high-voltage driving waveform, and collects free attenuation feedback voltage after the high-voltage driving waveform is stopped being applied; the analysis and diagnosis module analyzes impedance characteristics in real time according to the collected driving voltage and loop current, and judges whether a piezoelectric execution structure of the piezoelectric nozzle has a structural fault or not based on the impedance characteristics; and whether functional faults exist in the spray holes or not is judged based on the collected free attenuation feedback voltage. The in-situ and staged sensing capability of the working process of the spray head is achieved, the electrical response of each spray hole in the driving process and the feedback response after driving are independently obtained and analyzed, and precise distinguishing of structural faults and functional faults is achieved through dual-stage signal fusion. The universality is high, and the whole life cycle of spray hole health diagnosis is covered.

The invention relates to the technical field of high-voltage cable safety monitoring, in particular to a small-size fire source danger intelligent sensing method and system for a high-voltage cable, and the method comprises the following steps: collecting a sensing signal through a cable body coupling sensing terminal; the cable body coupling sensing terminal comprises a shielding layer impedance sensing unit which is coupled with a metal shielding layer of the high-voltage cable, a micro-channel gas collection unit which is arranged in parallel with a cable insulating layer, and an environment self-adaptive calibration unit. The cable body coupling sensing terminal is directly coupled with the metal shielding layer or the armor layer of the high-voltage cable, and the shielding layer impedance sensing unit, the micro-channel gas collection unit and the environment self-adaptive calibration unit are matched, so that the original signal collection accuracy is improved, and the influence of environment humidity on detection can be compensated.

The present disclosure provides a wireless power transmission device comprising an impedance matching circuit. The wireless power transmission device of the present disclosure may include: a transistor that outputs a signal corresponding to a set operating frequency based on an input signal and a driving voltage; a matching circuit connected to the transistor and converting the impedance of the signal corresponding to the operating frequency; a transmitting coil connected to the matching circuit; an LC resonant circuit connected in parallel between the transistor and the matching circuit and transmitting a signal corresponding to at least one harmonic frequency of the operating frequency; and an impedance sensing circuit connected to the LC resonant circuit and sensing the load impedance of the wireless power transmission device based on the signal corresponding to the at least one harmonic frequency transmitted through the LC resonant circuit. Various other embodiments of the wireless power transmission device comprising the impedance matching circuit of the present disclosure may be applied.

This invention discloses a welding torch nozzle device with self-powered and self-diagnostic functions, including a nozzle body, a thermoelectric conversion unit, an impedance sensing unit, and a signal processing unit. The signal processing unit is electrically connected to both the impedance sensing unit and the thermoelectric conversion unit, and the thermoelectric conversion unit supplies power to the signal processing unit. The signal processing unit receives impedance change signals from the impedance sensing unit and determines whether the nozzle is clogged. By placing the thermoelectric conversion unit on the outer wall of the nozzle body to recover welding waste heat and convert it into electrical energy, and placing the impedance sensing unit on the inner wall of the nozzle body to directly detect impedance changes caused by spatter adhesion, combined with the signal processing unit, in-situ real-time monitoring under self-powered conditions is achieved, forming a nozzle structure that integrates power supply and sensing. This eliminates the dependence on external power sources and complex wiring, improves the reliability and adaptability of the system in harsh welding environments, and significantly enhances the stability of the welding process and the quality of the weld.

A circuit includes a driver to provide a voltage at a node of a load and a first circuit to facilitate determining a load current at the node. The load is a capacitive load and the first circuit facilitates determining the load current by measuring a replica current and determining a capacitance of the load using values of the voltage and the replica current.

The utility model discloses a railway train control device based on track short circuit, which belongs to the technical field of railway communication and comprises a power supply module, an MCU (microprogrammed control unit) module, a relay control module, a track short circuit module, an impedance sensing module and a storage module. The MCU module is externally connected with an RS485 interface of a disaster prevention detection system; the power supply module supplies power to the relay control module; the MCU module is respectively connected with the relay control module and the storage module; the relay control module is connected with the track short circuit module; the track short circuit module is connected with the impedance sensing module; and the impedance sensing module is connected with the MCU module. The problem that it is difficult to automatically control the railway train to stop running in time is solved.

The invention provides an active waterproof detection method and system for an electronic equipment interface, and relates to the technical field of waterproof detection, and the method comprises the steps: configuring an impedance sensing network at the electronic equipment interface; monitoring a plurality of real-time impedance sensing signals of the plurality of electrode pairs in real time through an impedance sensing network; performing signal abnormal characteristic comparison on the plurality of real-time impedance sensing signals and a reference impedance sensing sample signal library to judge whether an abnormal signal is triggered or not, and if the abnormal signal is triggered, detecting the plurality of real-time impedance sensing signals and a water vapor impedance characteristic detection model obtained by training to obtain a plurality of water vapor condensation ports; and performing intrusion path tracing according to the plurality of water vapor condensation ports to obtain a first tracing abnormal source, and generating a corresponding first abnormal adjustment signal based on the first tracing abnormal source. The technical problem that the active waterproof detection effect of the electronic equipment interface is poor in the prior art can be solved, and the technical effect of improving the waterproof detection effect is achieved.

This invention discloses a flexible dual-mode carbon-based sensing patch, its preparation method, and its application in monitoring oyster freshness. It belongs to the field of flexible electronic sensors and non-destructive testing technology for food. The sensing patch includes a biodegradable electrospun substrate membrane, and a temperature sensing unit and an impedance sensing unit attached to the substrate membrane via conductive silver paste. The temperature sensing unit is a composite conductive film formed by vacuum filtration deposition of a graphene-carbon nanotube blend, and the impedance sensing unit is a conductive network film formed by vacuum filtration deposition of carbon nanotubes. The temperature sensing unit and the impedance sensing unit are respectively connected to conductive silver wires via conductive silver paste for signal transmission. This invention features a simple structure, controllable preparation process, stable sensing performance, and good compatibility with biodegradable substrates, providing a high-performance, integrable sensing solution for real-time, non-destructive monitoring of oyster freshness after death.

Systems and methods for notifying and evaluating neuromodulation therapy are disclosed herein. Systems configured in accordance with embodiments of the present technology may include, for example, a guidewire having a proximal portion, a distal portion configured to be positioned at a target site in a blood vessel of a human patient, and a sensing element positioned along the distal portion. The sensing element may be a pressure sensing element, a flow sensing element, an impedance sensing element, and / or a temperature sensing element. The system may also include a controller configured to obtain one or more measurements related to a physiological parameter of the patient via the sensing element. Based on the measurement, the controller may determine a physiological parameter and compare the parameter to a predetermined threshold. Based on the comparison, the controller and / or operator may assess the likelihood that the patient benefits from neuromodulation therapy.

A smart shoe system, includes a shoe having a shoe body, a shoe sole, and an insole. The shoe sole is attached to an outer surface of the shoe body's bottom, the insole is located within the shoe body onto an inner surface of the shoe body's bottom, and the shoe body is shaped and dimensioned to receive a user's foot. The insole includes a flexible pressure sensor array and impedance sensing electrodes. The flexible pressure sensor array includes a first electrode, a second electrode, and a flexible composite piezoresistive layer interposed between the first and second electrodes. Each of the first and second electrodes includes a flexible substrate and a flexible conductive electrode structure that is bonded to the flexible substrate.

An electronic device includes: a housing; an optical sensor disposed on the housing and including a light receiving unit and a light emitting unit configured to radiate light to the light receiving unit through an optical path; a bio-impedance detection sensor disposed adjacent to the optical sensor, and including a plurality of electrodes configured to transmit and receive a current through a current path; and one or more processor disposed in the housing. At least a portion of the optical path overlaps at least a portion of the current path. The one or more processor is configured to determine a biometric component based on an intensity of light detected by the optical sensor and a magnitude of impedance sensed by the bio-impedance detection sensor.

An impedance sensing circuit includes three impedance elements and a sensing element arranged in a bridge configuration. A first input terminal is coupled to two of the impedance elements to apply a stimulus signal. In a mutual-sensing mode, a second input terminal is coupled to the third impedance element and the sensing impedance element to apply an opposite phase stimulus signal. The impedance sensing circuit may be configured in a self-sensing mode, in which the opposite phase stimulus signal is decoupled from the third impedance element and the sensing impedance element. At least one of the impedance elements is variable and may be adjusted to balance an offset impedance load on the sensing element.

The invention discloses an integrated circuit impedance sensing system for tumor detection, relates to the technical field of tumor detection, and solves the problems that tumor detection needs a long time, is not suitable for rapid detection in an operation, is low in detection efficiency and automation degree, and is easy to cause detection errors caused by manual operation errors. An integrated circuit impedance sensing system for tumor detection comprises a semiconductor chip, a signal generator, an analog-to-digital converter, a field programmable gate array and an embedded silicon fan-out packaging structure, and a cell-sized microelectrode array is integrated on the surface of the semiconductor chip and used for capturing and adhering single cells. Through cooperation of the field programmable gate array and the transimpedance amplifier, when the semiconductor chip is detected, reliable detection and real-time processing of an ultra-weak electric signal are realized, so that the efficiency and the automation degree of the system are improved, and detection errors caused by manual misoperation are avoided.

The invention belongs to the field of structural coating corrosion degradation degree monitoring, and relates to an impedance sensing measurement system and method for multi-azimuth monitoring of coating degradation, and the system comprises a multi-probe sensing device and an AC impedance measurement circuit. The AC impedance measurement circuit comprises a single-chip microcomputer module, an excitation signal module, a measurement output signal amplification module and an impedance switching and impedance double-excitation measurement module, and the single-chip microcomputer module is connected with the excitation signal module, the measurement output signal amplification module and the impedance switching and impedance double-excitation measurement module. The excitation signal module and the measurement output signal amplification module are both connected with the impedance switching and impedance double-excitation measurement module, and the impedance switching and impedance double-excitation measurement module is connected with the multi-probe sensing device; according to the invention, the impedance of the coating in multiple directions can be measured, and the degradation condition of the coating in each direction can be monitored.

This disclosure relates to panel impedance sensing via a driver replicating current. A circuit includes: a driver that provides a voltage at a node of a load; and a first circuit that helps determine the load current at the node. The load is a capacitive load, and the first circuit helps determine the load current by measuring the replicated current and using the voltage and the value of the replicated current to determine the capacitance of the load.

An intracardiac ventricular pacemaker includes a pulse generator for delivering ventricular pacing pulses, an impedance sensing circuit, and a control circuit in communication with the pulse generator and the impedance sensing circuit. The pacemaker is configured to produce an intraventricular impedance signal, detect an atrial systolic event using the intraventricular impedance signal, set an atrioventricular pacing interval in response to detecting the atrial systolic event, and deliver a ventricular pacing pulse in response to the atrioventricular pacing interval expiring.

The invention relates to the technical field of constructional engineering, and discloses a concrete structure intelligent maintenance method based on multi-point impedance sensing. The invention aims to solve the problems that the existing concrete curing technology depends on experience and cannot sense the spatial non-uniformity of the internal state of the structure in real time, so that the curing measures are blind and the structure quality homogeneity is poor. According to the invention, a plurality of impedance sensors integrated with temperature sensors are arranged in a concrete structure, and AC impedance spectrum data and temperature data at different positions of the structure are synchronously acquired; using a pre-constructed correlation model to solve the current performance index of each monitoring position in real time according to the electrical data subjected to temperature compensation correction; and comparing the calculated performance index with a preset maintenance target, and generating a control instruction to drive a maintenance execution mechanism to carry out partitioned and differentiated maintenance operation on the structure.

The invention relates to the technical field of medical equipment, and particularly discloses a frequency control system and method of a multi-frequency electric field tumor suppression device. According to the system, an alternating electric field with a specific frequency band is generated through a multi-frequency signal generator and acts on a tumor area through an electrode array; the core is that a main controller is adopted to execute a closed-loop control strategy: a multi-frequency electric field is output according to a weighted cycle time sequence, the electrical impedance change of tumor tissues is monitored in real time through a biological impedance sensing module, and the output time weight of each frequency is dynamically adjusted according to the electrical impedance change. According to the method, the limitation of single-frequency treatment is effectively overcome, the sensitive frequencies of different tumor cells can be adaptively matched, the broad spectrum and accuracy of treatment are remarkably improved, meanwhile, the generation of tolerance is delayed through a real-time feedback mechanism, and the optimized tumor inhibition effect is achieved on the premise that the treatment safety is guaranteed.

Described herein are systems and methods for calibrating dry electrode bioelectrical impedance measurements. These method and apparatuses may be used for sensing bioelectrical impedance for ambulatory and or long-term measurements. Calibration of bioelectrical impedance sensing may be performed by using measurements taken during a shorted configuration of the apparatus, in which the same current is applied to both the source and sink stimulation electrodes, to modify measurements taken in a forward and / or reverse configuration in which current is applied to either the source and / or sink.

An impedance sensing structure is provided and includes a dielectric layer, a spiral electrode pair, an inlet element and an outlet element, and a sensing circuit, the spiral electrode pair forms a double-spiral channel on the dielectric layer and has an inlet portion at a central region of the double-spiral channel and an outlet portion at an end of the double-spiral channel. An inlet element and an outlet element are coupled with the inlet portion and the outlet portion, respectively, for directing fluid or gas through the double helix channel. The sensing circuit is electrically connected with the spiral electrode pair and is configured to sense particles in the fluid or the gas according to the impedance of the spiral electrode pair and the fluid or the gas flowing through the double-spiral channel.

The invention relates to a high-frequency generator system (12) for plasma excitation for a plasma process, comprising a signal generator unit (18) configured to generate at least three high-frequency signals with different frequencies. The high-frequency generator system (12) includes a broadband amplifier stage (24) configured to amplify the high-frequency signals in order to output amplified high-frequency signals at an amplifier stage output (26) of the amplifier stage (24). The high-frequency generator system (12) has a matching network (28) configured to set a predetermined impedance for the amplifier stage output (26) of the amplifier stage (24), wherein the impedance between the amplifier stage output (26) and the matching network (28) is not equal to 50 ohms. The high-frequency generator system (12) has a plasma process impedance sensing unit (34) configured to detect a complex-valued impedance (Z). P) of the plasma process, wherein a control unit (42) is set up, the signal generator unit (18), the amplifier stage (24) and / or the matching network (28) is set up based on the detected complex-valued impedance (Z). P ) of the plasma process. Furthermore, a plasma generation plant (10) and a method for exciting a plasma for a plasma process are described.

A battery management device (10) according to the present disclosure comprises: an AC signal supply unit (11) configured to supply an AC signal to a lithium-ion secondary battery (20), an impedance sensing unit (12) configured to detect a value of a real part of an AC impedance from the lithium-ion secondary battery (20) to which the AC signal was supplied, an expansion quantity calculation unit (13) configured to calculate a quantity of expansion of a cell in the lithium-ion secondary battery (20) based on a difference between the detected current value of the real part of the AC impedance and an initial value of the real part of the AC impedance, and a control unit (14) configured to reduce an upper limit value of a state of charge of the lithium-ion secondary battery (20).when the calculated amount of expansion increases.

The invention relates to the field of concrete structure health monitoring, in particular to an intelligent bolt based on piezoelectric impedance and a concrete structure health monitoring method, the structure comprises a bolt and an impedance sensing unit, the bolt comprises a screw rod and a nut, the nut is arranged at the top of the screw rod, and the impedance sensing unit is arranged at the top of the screw rod. The nut is fixedly connected with the screw rod, the screw rod is arranged in concrete, and the nut is provided with a groove; the impedance sensing unit is arranged in the groove, the impedance sensing unit is used for sending and receiving impedance signals, the impedance sensing unit is arranged in the nut, signal sending and signal receiving are achieved through a single bolt, and concrete structure health monitoring can be completed through the single bolt; other detachable intelligent sensing components are not needed, and weakening of the strength of the concrete structure is avoided.