An ultra-low-power wireless impedance measurement system is provided having a sensor group with a piezoelectric sensor, a temperature sensor, an impedance analyzer and a wireless transceiver is to transmit associated data via wireless transmission. Processed temperature and impedance data are transmitted to a server, whereby the processed temperature and impedance data are conveyed to a user via a website.

A method and system of acquiring and processing acoustic-based sensor data in real-time for process monitoring, diagnostics, and prognostics. The method comprises continuously capturing analog signal data; continuously digitizing the signal data; selecting a time interval of the digitized data; applying an STFFT to the data within the time interval; selecting a harmonic frequency to monitor; shifting the time interval by a percentage of the duration of the time interval; applying the STFFT to the data within the shifted time interval; and observing the data to determine whether the data have changed. The system comprises modules for acquiring analog signal data; digitizing the analog signal data as the data are acquired; displaying the data as the data are processed; recursively applying an STFFT to the data; displaying results of applying a STFFT to the data; applying an FFT to the data; and displaying results of applying an FFT to the data.

Systems and methods for sensing internal states of vehicle batteries are described. From this internal state information, various physical characteristics of the battery can be measured, calculated or inferred. A vehicle can include an electric motor, a battery to store electrical energy for the electric motor, and a sensor connected to the battery to sense a battery state, to receive an input signal, and to wirelessly transmit an output signal indicating the battery state. The sensor may be passive and built into the structure of the battery. The sensor can be a surface wave acoustic sensor with a magnetic field sensor, which can be a magnetoimpedance sensing device and a temperature sensor.

Systems and methods for analyzing physical characteristics of a battery include arrangements of two or more transducers coupled to the battery. A control module controls one or more of the two or more transducers to transmit acoustic signals through at least a portion of the battery, and one or more of the two or more transducers to receive response acoustic signals. Distribution of physical properties of the battery is determined based at least on the transmitted acoustic signals and the response acoustic signals.

An oxygen concentrator may rely on a pressure swing adsorption process to produce an oxygen enriched gas stream from canisters filled with granules capable of separation of oxygen from an air stream. The adsorption process uses a cyclical pressurization and venting of the canisters to generate an oxygen enriched gas stream. The oxygen concentrator system may include one or more flow restrictors to allow controlled release of oxygen enriched gas between the canisters.

Acoustic ambient temperature and humidity sensing based on determination of sound velocity is described, in addition to sensors, algorithms, devices, systems, and methods therefor. An exemplary embodiment employs sound velocity in the determination of ambient temperature and humidity. Provided implementations include determinations of sound velocity based on time of flight of a coded acoustic signal and/or based on resonance frequency of a Helmholtz resonator.

Measuring and/or monitoring food doneness using ultrasound. The present invention provides a method, system, computer program product and sensor for measuring and/or monitoring the degree of food doneness. The present invention provides means for non-invasively and continuously determining the degree of food doneness using ultrasound technology. In general, the present invention works by applying ultrasound signals to a food item, receiving the ultrasound signals emitted back from the food item, and analyzing the input and output signals to determine the degree of food doneness. The food doneness sensor can be a stand-alone device, embedded into a cooking tool, embedded into a cooking apparatus, and/or embedded into a food production assembly line. The present invention can be used personally/commercially. User feedback regarding the performance of the present invention can be provided to a cloud database and used to modify/adjust the measuring/monitoring process. Finally, multiple ultrasound sensors/transponders can be coupled together.

Techniques for determining temperature and velocity in a space inside a gas turbine engine (100) include mounting acoustic sensors (150) in the engine. The sensors are mounted to detect acoustic signals in a space (108) of fluid flow without extending into the space. A first sensor (350a) is displaced a first distance (351) from a different second sensor (350b) in a first direction parallel to fluid flow through the space. First and second signals are detected at the first and second sensors, respectively. A travel time difference between the first and the second sensors is determined by control system (170) module (180) based on the first and second signals. Velocity of fluid flow in the space is determined by the module based on the travel time difference. Temperature of fluid flow in the space is determined by the module based on either the first or the second signals or both.

Certain embodiments of the present disclosure are directed to a method that may include identifying at least one metric for a fluid flowing through a line from a vessel to a dispenser. The method may include identifying a reference value for the at least one metric for the fluid. The method may include performing an analysis of the fluid based on the at least one metric for the fluid. The method may include comparing results of the analysis with the reference value. The method may include performing at least one action based on determining that there has been a change in the at least one metric relative to the reference value.

Systems and methods of determining settlement characteristics of a drilling mud are disclosed. Conditions under which heavier elements of the drilling mud settle under the influence of gravity can be determined. Samples of drilling mud can be placed in testing cells, and ultrasonic test pulses can be transmitted through the samples. Responses to the test pulses can be detected and compared to other responses detected at different vertical positions within the testing cell. Settlement can be detected when the responses from different vertical positions are generally dissimilar. An environmental temperature of the testing cell can be changed over a testing time interval, and a settlement temperature can be determined by detecting a divergence in the responses from different vertical positions.