In one embodiment, a flexural wave absorption system detects, with a sensor attached to a beam, an incident wave propagating in the beam. The system determines, based on a signal from the sensor generated in response to the incident wave, an amplitude and phase of the incident wave propagating in the beam and controls an actuator connected to the beam to generate a suppression wave, based on the amplitude and the phase of the incident wave, that reduces a coefficient of reflection of the incident wave across a broadband frequency range.

Apparatus is provided having an acoustic-based air probe with an acoustic source configured to provide an acoustic signal into a mixture of concrete; and an acoustic receiver configured to be substantially co-planar with the acoustic source, to respond to the acoustic signal, and to provide signaling containing information about the acoustic signal injected into the mixture of concrete.

A system for detecting vehicle body damage is disclosed. One or more ultrasonic transceivers are installed on a portion of the vehicle body and configured to transmit and receive ultrasonic sound waves. One or more controllers are coupled to the one or more ultrasonic transceivers. The one or more controllers are programmed to cause the ultrasonic transceiver to emit first ultrasonic sound waves and receive first reflected ultrasonic sound waves, store in memory first sound signature data relating to the first reflected ultrasonic sound waves, cause the ultrasonic transceiver to emit second ultrasonic sound waves and receive second ultrasonic sound waves, and determine a presence of damage on the portion of the vehicle body based on second sound signature data relating to the second reflected ultrasonic sound waves deviating from the first sound signature data.

A field portable diagnostic apparatus uses a rotatable disk in which a microfluidic circuit is defined. The microfluidic circuit includes a centrifugal separation chamber receiving a sample to stratify the sample. A magnetic bead holding chamber is communicated to a mixing chamber, where mass amplifying functionalized magnetic-nanoparticles, held in a buffer solution and contained in the magnetic bead holding reservoir communicated to mixing chamber, are mixed with the separated fluid delivered to mixing chamber from the separation chamber. The functionalized magnetic nanoparticles conjugate with a target analyte in the sample. A magnet in proximity to a SAW chamber including a SAW detector draws the functionalized magnetic nanoparticles toward antibodies immobilized on the SAW sensor surface A wash reservoir is communicated to the SAW sensor chamber, and a cleanup/waste reservoir is communicated to the SAW chamber for receive fluid after it has passed through the SAW chamber.

A field portable diagnostic apparatus uses a rotatable disk in which a microfluidic circuit is defined. The microfluidic circuit includes a centrifugal separation chamber receiving a sample to stratify the sample. A magnetic bead holding chamber is communicated to a mixing chamber, where mass amplifying functionalized magnetic-nanoparticles, held in a buffer solution and contained in the magnetic bead holding reservoir communicated to mixing chamber, are mixed with the separated fluid delivered to mixing chamber from the separation chamber. The functionalized magnetic nanoparticles conjugate with a target analyte in the sample. A magnet in proximity to a SAW chamber including a SAW detector draws the functionalized magnetic nanoparticles toward antibodies immobilized on the SAW sensor surface A wash reservoir is communicated to the SAW sensor chamber, and a cleanup/waste reservoir is communicated to the SAW chamber for receive fluid after it has passed through the SAW chamber.

A photoacoustic gas sensor includes a hermetically sealed housing filled with a reference gas. The photoacoustic gas sensor furthermore includes a microphone arranged in the housing and configured to generate a microphone signal as a function of a sound wave based on light incident in the housing. Furthermore, the photoacoustic gas sensor includes a controllable heat source arranged in the housing and configured to selectively thermoacoustically excite the reference gas in order to generate a thermoacoustic sound wave phase-shifted with respect to the sound wave.

A system for inspecting an acoustic treatment applied to the hull of a maritime vessel includes an underwater inspection system including at least one signal emitter configured to emit a signal, at least one receiver configured to receive the signal after the signal has come into contact with the acoustic treatment applied to the hull of the maritime vessel, wherein the signal provides information about the integrity of the acoustic treatment and a processor configured to perform signal processing on the received signal and generate an output comprising information about one or more parameters of the acoustic treatment. The inspection system thereby allows for in-water inspection of acoustic treatments applied to a maritime vessel thus avoiding the need for a costly and time-consuming inspection of such a vessel while in dry-dock.

The subject disclosure presents systems and computer-implemented methods for determining an acoustic time-of-flight (TOF) of sound waves through a sample material with greater accuracy and in a more repeatable fashion, by invoking one or more of an envelope generation for an error function, fitting a non-linear curve to an ultrasound frequency sweep, or performing a clustered piece-wise linear regression on individual linear parts of the ultrasonic frequency sweep. The systems and methods are useful for, among other things, monitoring diffusion of fluids through porous materials, such as tissue samples.

A measurement method includes a measurement step of measuring a first single value and a second signal value, the first signal value being based on a reaction between a first reacting substance and the sample, the second signal value being based on a reaction between a second reacting substance and the sample, the first reacting substance having a higher reactivity to a second detection target than to a first detection target, the second reacting substance having a higher reactivity to the first detection target than to the second detection target.

A method and apparatus for determining a gas influx into a wellbore. A work string defining an inner bore area and an annulus area, with a pair of inner bore sensors in the inner bore and a pair of annulus sensors in the annulus. A processor sets a gas influx alarm limit based on a steady-state value of an acoustic parameter measured by the pair of inner bore sensors in an absence of a gas influx and a steady-state value of the acoustic parameter measured by the annulus sensors in the absence of the gas influx. The processor determines a gas influx in the wellbore when a subsequent value of the acoustic parameter is outside of the alarm limit and performs an action at the work string to counteract the gas influx in the wellbore.