54 results about "Impedance response" patented technology

A system includes a resonant sensor in contact with oil within a gearbox of a rotor system, such as a wind turbine, and one or more processors. The sensor includes electrodes and a sensing circuit that generates electrical stimuli having frequencies applied to the oil at different times during a life of the gearbox. The processors receive electrical signals from the resonant sensor representative of impedance responses of the oil to the electrical stimuli. The processors analyze the impedance responses and determine a concentration of a polar analyte in the oil at different times. The processors calculate a degradation value for the gearbox based on the concentration of the polar analyte. Responsive to the degradation value exceeding a designated threshold, the processors at least one of schedule maintenance for the rotor system, provide an alert to schedule maintenance, or prohibit operation of the rotor system until maintenance is performed.

A system includes one or more processors and a resonant sensor that contacts oil within an engine of a vehicle system. The sensor generates electrical stimuli at different times during an operational life of the engine. Each electrical stimulus has multiple different frequencies applied to the oil. The one or more processors receive electrical signals representing impedance responses of the oil to the electrical stimuli. The one or more processors determine a concentration of a polar analyte in the oil at the different times based on the impedance responses and calculate a degradation value for the engine based on the polar analyte concentration. Responsive to the degradation value exceeding a designated degradation threshold, the one or more processors at least one of schedule maintenance for the vehicle system, provide an alert to schedule maintenance for the vehicle system, or prohibit operation of the vehicle system until maintenance is performed.

The present invention is a controllable input impedance RF mixer, which when fed from a high impedance source, such as a current source, provides a high quality factor (Q) impedance response associated with an impedance peak. The high-Q impedance response may be used as a high-Q RF bandpass filter in a receive path upstream of down conversion, which may improve receiver selectivity and replace surface acoustic wave (SAW) or other RF filters. The present invention uses polyphase reactive circuitry, such as capacitive elements, coupled to the down conversion outputs of an RF mixer. The RF mixer mixes RF input signals with local oscillator signals to translate the impedance of the polyphase reactive circuitry into the RF input impedance of the RF mixer. The RF input impedance includes at least one impedance peak. The local oscillator signals are non-overlapping to maximize the energy transferred to the polyphase reactive circuitry.

A system includes an impedance gas sensor configured to be in contact with one or more hydrocarbons. The impedance sensor includes electrodes and a sensing region circuit that is configured to have a sensing material and to generate electrical stimuli to the sensing material upon exposure to one or more hydrocarbons at one or more of a reduced heater voltage or a reduced sensing region temperature as compared to a prescribed heater voltage or a prescribed sensing region temperature. The system also includes one or more processors configured to receive electrical signals from the sensor, where the electrical signals are representative of impedance responses of the sensing material to one or more hydrocarbons. The one or more processors also are configured to analyze the impedance responses and determine an amount of at least one hydrocarbon of interest in the one or more hydrocarbons.

The invention discloses multi-lateral root fruit tree bridging technology, which is a method for performing single-head bridging on a one-year high-quality seedling of a pyrus betulaefolia rootstock which is transplanted successfully on a plurality of sides, 50 to 70 centimeters away from the ground surface, of a fruit tree trunk when a fruit tree is in a growing season. By bridging the fruit tree by the method, the rootstock and the high-quality seedling have no impedance response basically; the root is supplied with sufficient nutrition so that the fruit tree obtains increased nutrients; therefore, harvest rate and fruit quality are improved; and the disease resistance of the fruit tree is improved and a survival period is prolonged.

The inventive method for ablating a tissue mass associated with a human or animal patient being treated comprises positioning an ablating electrode in a tissue mass to be ablated. A plurality of return electrodes are positioned on the patient. Electrical energy is applied between the return electrodes and the ablating electrode. The temperature of the return electrodes is measured to generate a temperature measurement signal which is used to control ablation current through the return electrodes.

Systems and methods are provided for environment sensing. The system includes a sensor node having a sensor. The sensor includes a sensing material configured to be in contact with an ambient environment. The system includes a remote system having a communication circuit and a controller circuit. The communication circuit is configured to be wirelessly communicatively coupled to the sensor node. The controller circuit electrically coupled to the communication circuit. The controller circuit configured to receive an impedance response of the sensing material and analyze the impedance response of the sensing material at frequencies that provide a linear response of the sensing material to an analyte of interest and at least partially reject effects of interferences.

In a sensor control circuit, an impedance signal output unit has a HPF, a P / H circuit, a LPF, etc., and detects an element impedance of a sensor element on the basis of an impedance response signal which is alternately changed in response to an alternating current signal supplied to the sensor element. The P / H circuit has an input comparator which inputs an impedance detection voltage Vz after the HPF, a rectifying element connected to the P / H circuit, and a hold capacitor which is charged by the output of the input comparator. The input comparator has a constant current circuit and a transistor. The constant current circuit limits an updating value of a hold voltage value Vph of the hold capacitor every alternating current period. The sensor control device detects the element impedance of the sensor element with high accuracy while preventing influence of noise.

The invention discloses an electrodermal impedance flexible detection device and an electrodermal impedance detection method. The electrodermal impedance flexible detection device comprises a microprocessor module, an impedance measuring module and at least one microelectrode module contacting with to-be-detected skin and used for collecting electric impedance information, the microprocessor module controls the impedance measuring module to send voltage excitation signals different in frequency to the microelectrode modules and analyzing and transmitting impedance response signals after beingreceived and processed by the impedance measuring module, the microelectrode modules are arranged on the lower surface of a flexible circuit substrate, and a transparent thin film layer is arranged onthe upper surface of the flexible circuit substrate. By utilizing the method, real-time accurate monitoring and analyzing of biological electric impedance on the surface under multiple-frequency conditions can be realized.

An apparatus and method for determining the condition of an electricity-producing cell such as a fuel cell is disclosed. A signal is injected into an electricity-producing cell, a voltage and / or current response is measured, and the impedance response of the electricity-producing cell is calculated using the injected signal and the response. The injected signal is a broadband signal that includes a plurality of superimposed waveforms at different frequency set points across a frequency range. The distribution of the waveform frequency set points is linear at either or both of a lower portion and an upper portion of the frequency range, and is logarithmic at a mid-range of the frequency range. The response at each of the frequency set points are simultaneously obtained and the impedance response across the frequency range is calculated and used to determine a condition of the electricity-producing cell.

Embodiments of the present invention are directed to crossover circuits for reducing impedance response variance of a speaker. A speaker includes at least one driver and one or more electrical components. The speaker has a baseline frequency and impedance response when no associated series resistance or impedance is connected to the speaker. A pair of terminals is used for connecting the speaker to external components. Connecting the speaker to external components results in an associated series resistance or impedance, that causes the frequency response of the speaker to vary from the baseline frequency response across various frequency ranges. A crossover circuit is connected to at least one of the pair of input terminals. The crossover circuit includes electrical components configured to reduce the impedance response variance inherent to the speaker, thus reducing variances in the frequency response caused by impedances and resistances placed in series with the speaker.

A sensor system, device and method for generating a wireless signal in response to a sensed illumination. A sensor is disclosed having: a photosensitive element; a device that converts a sensed illumination detected by the photosensitive element into a corresponding impedance response; and a wireless signal generator that generates a wireless output based on a characteristic of the corresponding impedance response, wherein the wireless output correlates to the sensed illumination.

A locomotive system is provided that includes a platform, plural wheel-axle sets operably coupled to the platform, a reservoir attached to the platform and configured to hold a fluid, and a resonant sensor probe assembly coupled to the reservoir. The sensor probe assembly includes a substrate formed from one or more dielectric materials and free-standing electrodes coupled with the substrate. The free-standing electrodes are configured to be placed into the fluid, to generate an electric field between the free-standing electrodes, and to measure an impedance response of the sensor to the fluid between the electrodes.

The invention relates to a method for improving the health state of a valve-regulated lead-acid storage battery based on resonance current pulses. The method comprises the following steps: firstly, calibrating the capacity of the valve-regulated lead-acid storage battery by utilizing cyclic test equipment, then testing by utilizing a low-frequency constant-potential electrochemical impedance spectroscopy, and calibrating the initial health state of the valve-regulated lead-acid storage battery according to the tested complex impedance response; then, utilizing a weak voltage signal generated by a signal generator to generate a resonance current pulse through a high-speed power amplifier so as to load the valve-regulated lead-acid storage battery, and then repeating capacity calibration and health state calibration; and finally, fitting the phase response and the frequency of the valve-regulated lead-acid storage battery measured in the step of calibrating the health state to obtain a radius parameter of the spherical electrode to quickly evaluate the health state of the valve-regulated lead-acid storage battery. According to the method, the health state of the valve-regulated lead-acid storage battery can be quickly detected by adopting a low-frequency constant-potential electrochemical impedance spectroscopy test, and the health state of the valve-regulated lead-acid storage battery can be quickly improved at low cost by lifting the valve-regulated lead-acid storage battery through the resonance current pulse, so that the method has great significance in improving the efficiency and the reliability of an electrical energy storage system.

An apparatus comprises an amplifier having a predefined linear range and a shunt load. The shunt load may be connected to an output, an input, or between gain stages of the amplifier. An impedance of the shunt load dynamically varies in response to a level of a signal presented at a node formed by interconnection of the shunt load and the amplifier, extending linearity of the amplifier beyond the predefined range.

A resonant sensor probe assembly includes a substrate formed from one or more dielectric materials and free-standing electrodes coupled with the substrate. The free-standing electrodes are configured to be placed into the fluid and to generate an electric field between the free-standing electrodes. A controller measures an impedance response of the sensor to the fluid between the electrodes to determine an aging effect of the sensor.

The invention provides a method for accelerating color printing iron corrosion by using electrochemical cathodic polarization. The method comprises the following steps of: (1) manufacturing the color printing iron into a working electrode, installing the working electrode into an electrolytic tank, wherein a reference electrode and an auxiliary electrode are installed in the electrolytic tank in advance, and assembling into an electrolytic tank system; (2) maintaining the electrolytic tank system in an anaerobic environment; (3) connecting the electrolytic tank, an electrochemical working station, an adjustable voltage-stabilized power supply and a double-pole-double-throw switch; and (4) adjusting the output voltage of the adjustable voltage-stabilized power supply so as to carry out cathodic polarization on the working electrode, measuring the electrochemical impedance spectrum of the working electrode by using the electrochemical working station, obtaining the coating resistance of the working electrode, and confirming that the coating corrosion final point is reached when the coating resistance is less than or equal to 106omegacm<2>. By utilizing the method, relatively high resolution is achieved, the degree of degradation and failure of the coating is quantitatively analyzed according to the change of the impedance response, and good foundation is established for further improving and optimizing a color printing iron machining process.