When frequencies used in the two-frequency measurement of a SAW sensor are represented by f.sub.1 and f.sub.2 (f.sub.2>f.sub.1), an electrical signal processing device is provided without use of oversampling at a frequency higher than twice the frequency f.sub.2 or a two-system low-frequency conversion circuit, in which temperature compensation with the same accuracy as the case where these are used can be realized. Narrow band frequency filtering is applied to a waveform after roundtrips in a delay line type SAW sensor capable of transmitting and receiving multiple frequencies, the two frequencies f.sub.1 and f.sub.2 (f.sub.2>f.sub.1) are extracted, and a delay time is determined utilizing an aliasing obtained by applying undersampling at a frequency lower than twice the frequency f.sub.1.

The invention relates to novel processes for determining the quality of an uncrosslinked rubber mixture by means of ultrasound and to an apparatus suitable for this purpose.

Aspects provide for in-situ monitoring of a structure, such as a portion of an in-operation vehicle, by a patch and controller by transmitting, at a first time, a first signal from a first transceiver of a plurality of transceivers in contact with the structure; receiving the first signal carried in the structure at a second transceiver of the plurality of transceivers at a known distance from the first transceiver; determining a baseline signal characteristic of the first signal as received at the second transceiver; transmitting, at a second time, a second signal from the first transceiver; receiving the second signal carried in the structure at the second transceiver; determining a diagnostic signal characteristic of the second signal as received at the second transceiver; and in response to determining that a difference between the baseline signal characteristic and the diagnostic signal characteristic exceeds a threshold, generating an alert.

A NEMS readout system includes a sensor array comprising a plurality of sensors. Each sensor of the plurality of sensors including a resonator with frequency characteristics different from the resonator of each other sensor of the plurality of sensors. A readout signal indicative of a plurality of output signals is collected from the sensor array. Each output signal of the plurality of output signals corresponding to one of the plurality of sensors. An analysis of the plurality of output signals is performed to identify a plurality of resonant frequencies and to detect a frequency shift associated with at least one of the plurality of resonant frequencies.

Redox of an analyte is coupled with redox of a precipitation precursor to generate a precipitating molecule that precipitates on the surface of a thin film bulk acoustic resonance (TFBAR) to allow mass detection of the precipitation molecule as a surrogate for the analyte. This disclosure describes, among other things, detection of an analyte using a TFBAR operating at a high frequency without direct binding of the analyte on a surface of the TBAR. Detection of the analyte is indirect with a precipitating molecule serving as a surrogate for the analyte.

A system for nondestructive testing of a composite includes a emitter that transmits a plurality of sound signals to a composite at over a range of frequencies and receives sound signals from the composite, and generates electric signals in response to the received signals; a computer control for receiving the electric signals from the emitter, wherein the computer control programmed to apply a different, preset gain setting to at least one of the plurality of frequencies for a selected display image such that the display image shows a plot of received signal amplitude for the plurality of frequencies that is at least partially flattened, so that the amplitude of the signal from material without defects is the same at all frequencies, and changes in the amplitude of the signal are visually perceptible on the display for all of the plurality of signals.

To detect air in a fluid delivery line of an infusion system, infusion fluid is pumped through a fluid delivery line adjacent to at least one sensor. A signal is transmitted and received using the at least one sensor into and from the fluid delivery line. The at least one sensor is operated, using at least one processor, at a modified frequency which is different than a resonant frequency of the at least one sensor to reduce an amplitude of an output of the signal transmitted from the at least one sensor to a level which is lower than a saturation level of the analog-to-digital converter to avoid over-saturating the analog-to-digital converter. The signal received by the at least one sensor is converted from analog to digital using an analog-to-digital converter. The at least one processor determines whether air is in the fluid delivery line based on the converted digital signal.

A device (1) including an ultrasonic measuring unit (7) that sends an ultrasonic signal (S1) into a structure (2) and measures the amplitude of the ultrasonic signal (S2) reflected by the structure (2), a processing unit for determining the thickness of the interposition mastic (3) from the measurements of the ultrasonic measuring unit (7) and with the aid of a propagation model of the interposition mastic (3) which provides a thickness value of the interposition mastic (3) depending on the propagation time of the ultrasonic signal in the interposition mastic (3) as well as auxiliary data, and a processing unit for deducing a conformity or a lack of conformity of said interposition mastic (3) and the presence of cuttings from the thickness of the interposition mastic (3), the device (1) carrying out a conformity checking that is accurate, fast and reliable without having to disassemble the structure (2).

A method of detecting at least a partial blockage in a porous member separating an inner chamber of a device having a gas sensor responsive to an analyte positioned within the inner chamber and an ambient environment includes emitting pressure waves within the inner chamber and measuring a change in phase of a response via a sensor responsive to pressure waves.

The application provides a device for measuring at least one parameter value of a suspended sediment of a fluid. The device includes a backscattering transducer module, a storage unit, and a calculation unit. The backscattering transducer module comprises a source module and a receiver module. The source module transmits at least three acoustic signals with different fixed characterizing measurement frequencies while the receiver module measures at least three echo level values of echo signals, which correspond with the at least three acoustic signals. The storage unit stores a data set of pre-determined echo level values with a data set of pre-determined suspended sediment parameter values. The calculation unit derives at least one suspended sediment parameter value from the data sets and the at least three echo level values.