In some aspects, the described systems and methods provide for a method comprising transmitting to a brain of a patient, with at least one transducer, acoustic signals. The method further comprises receiving from the brain, with the at least one transducer, data acquired from the brain including information related to standing waves, distribution of acoustic modes, frequency response, and/or impulse/transient response. The method further comprises determining, from the acquired data, intracranial pressure of the person.

In some aspects, the described systems and methods provide for a method comprising transmitting to a skull of a patient, with at least one transducer, acoustic signals. The method further comprises receiving from the skull, with the at least one transducer, data acquired from the skull including information related to guided waves, distribution of acoustic modes, frequency response, and/or impulse/transient response. The method further comprises determining, from the acquired data, intracranial pressure of the person.

In some aspects, the described systems and methods provide for a method comprising transmitting, with at least one transducer, acoustic signals to a brain of a patient, wherein the at least one transducer is configured to induce excitation of a plurality of acoustic modes. The method further comprises receiving, with the at least one transducer, data acquired from the brain including information related to standing waves, frequency response, impulse/transient response, and/or distribution of acoustic modes. The method further comprises determining, from the acquired data, a distribution of intracranial pressure within the brain of the person.

In some aspects, the described systems and methods provide for a method comprising transmitting to a brain of a patient, with at least one transducer, acoustic signals. The method further comprises receiving from the brain, with the at least one transducer, data acquired from the brain including information related to standing waves, distribution of acoustic modes, frequency response, and/or impulse/transient response. The method further comprises detecting, from the acquired data, a seizure of the person.

In some aspects, the described systems and methods provide for a method comprising transmitting to a brain and/or skull of a patient, with at least one transducer, acoustic signals. The method further comprises receiving from the brain and/or skull, with the at least one transducer, data acquired from the brain and/or skull including information related to standing waves, guided waves, distribution of acoustic modes, frequency response, and/or impulse/transient response. The method further comprises determining, from the acquired data, presence of a tumor within the brain of the person.

In some aspects, the described systems and methods provide for a method comprising transmitting, with at least one transducer, acoustic signals to a brain of a patient, wherein the at least one transducer is configured to induce excitation of a plurality of acoustic modes. The method further comprises receiving, with the at least one transducer, data acquired from the brain including information related to standing waves, frequency response, impulse/transient response, and/or distribution of acoustic modes. The method further comprises determining, from the acquired data, a location of a seizure site within the brain of the person.

Embodiments relate to noncontact determination of nonlinearities. Initially, a first and second primary signal are preconditioned to produce a first and second tone capable of reaching a target granular media. Using a sound source, the first and second primary signals are emitted such that the first and second primary signals combine in a nonlinear fashion in the target granular media to produce low frequency acoustic tone that is a difference between the first and primary signals. An acoustic pulse is received by an acoustic receiver, and a quadratic nonlinearity coefficient and an acoustic pressure field are determined based on the acoustic pulse. At this stage, a sediment shear strength of the granular media is correlated to the quadratic nonlinearity coefficient to generate a shear strength lookup table.

The invention relates to a method for testing of a train wheel by ultrasound. The method is based on a pulsed ultrasonic field in the train wheel to be tested by an array of individually controllable ultrasonic transmitting transducers acoustically coupled to the train wheel each controlled with a specific analog transient excitation signal. Each analog transient excitation signal generated based on an ultrasonic transmitting transducer-specific stored digital transient excitation function. The resulting echo signals from the train wheel to be tested are recorded by an array of individually controllable ultrasonic receiving transducers. Each ultrasonic receiving transducer can provide an analog, time-resolved echo signal. The received echo signals can be digitized in a transducer-specific way and stored in a set. A plurality of different reception processing rules can then be applied to the latter. Furthermore, the invention relates to a device for carrying out the method.

An ultrasonic fingerprint sensor system of the present disclosure may be provided with an ultrasonic transmitter or ultrasonic transceiver having an electrode layer divided into a plurality of electrode segments. The ultrasonic fingerprint sensor system may detect an object over one or more electrode segments and provide a voltage burst to one or more selected electrode segments for localized generation of ultrasonic waves. The localized generation of ultrasonic waves may facilitate localized readout for imaging. In some implementations, the voltage burst may be provided in a single-ended drive scheme or differential drive scheme.

A marine electronics system is provided including a transducer assembly configured to receive active sonar returns during a first time period and receive passive sonar data during a second time period. The system also includes a marine electronics device including a user interface comprising a display, a processor, and a memory including computer program code configured to cause the marine electronics device to receive the passive sonar data from the transducer element, generate a noise level indicator based on the passive sonar data, and cause the noise level indicator to be displayed on the user interface. The noise level indicator includes an indication of an ambient noise level associated with the vessel.