Abstract:
An electrical circuit for driving a piezoelectric transducer includes a DC electric source, a constant current circuit, connected to the DC electric source for processing a DC signal from the DC electric source and supplying a constant output current having a predetermined constant value, and an oscillation circuit connected to the constant current circuit for driving the piezoelectric transducer with a resonance frequency and with a constant current. The electrical circuit approximately drives the piezoelectric transducer with a constant current by supplying the constant current to the oscillation circuit.
Abstract:
An improved ultrasonic nebulizer for administering a medicament aerosol to a patient. Output from an oscillator is connected through a series inductor to a transducer adjacent a reservoir which generates aerosol from the medicament. The inductor is tuned for series resonance with the bulk capacitance of the transducer. An impedance change in the transducer when liquid is removed or consumed from the reservoir reduces the power delivered to the transducer and prevents transducer damage.
Abstract:
A method of measuring dissociation of the biomolecular bonds in one or multiple sample wells using super-resolution force spectroscopy (SURFS). SURFS utilizes precise ultrasound radiation to exert an acoustic radiation force on the biomolecular bonds labeled with magnetic particles. The force-induced dissociation of the protein bonds labeled with magnetic particles may be measured as a reduced magnetic signal by a magnetic sensor. The force resolution allows for differentiating biomolecular bonds with an extremely high level of precision. The biomolecular bonds include protein-protein, protein-nucleic acid, nucleic acid-nucleic acid, small molecule-protein, and small molecule-nucleic acid interactions.
Abstract:
An ultrasound sonotrode (101), the first end of which is adapted to be connected to a mechanical vibrations source, equipped with a working tip (105,205,405,805) at the opposite end of the sonotrode (101), equipped with a body (104) with a cooling jacket (103), sealed at the place of contact with the body (104) of the sonotrode (101) with the use of the first seal (106) and the second seal (107), characterized in that according to the invention the first seal (106) is placed at a distance less than or equal to 20 mm from the node of the standing wave excited in the sonotrode in the working conditions, and the second seal (107,207,407,507,607) is equipped with a resilient element (108,208,408,508,608) and is located at a distance less than or equal to 20 mm from the working tip (105,205,405,805). A method for metal alloying, in which the material is melted on the working tip (105, 205, 405, 805) of the sonotrode excited to mechanical vibrations, according to the invention characterized in that a sonotrode according to the invention is used.
Abstract:
A mist inhaler device (200) for generating a mist including a therapeutic for inhalation by a user. The device includes a mist generator device (201) and a driver device (202). The driver device (202) is configured to drive the mist generator device (201) at an optimum frequency to maximise the efficiency of mist generation by the mist generator device (201).
Abstract:
In various arrangements, a nebulizer element of a nebulizer may be energized with a drive signal. A phase offset of the drive signal may be measured. A phase delta may be determined. The phase delta may indicate a difference between a target phase offset and the measured phase offset. The target phase offset may indicate a non-zero target phase difference between the voltage of the drive signal and the current of the drive signal. A frequency of the drive signal may be changed to decrease the phase delta.
Abstract:
A generator for exciting a piezoelectric transducer, includes at least one digital processor unit. The digital processor unit is configured to operate at least in an iterative operation stage including more than two successive iterations. Each iteration includes: exciting the transducer at a plurality of frequencies in a frequency band about a set-point frequency; during transducer excitation, acquiring one or more values related to at least one electrical magnitude associated with the excitation of the transducer for a plurality of frequencies in the frequency band; and analyzing the values acquired to determine a new set-point frequency for a subsequent iteration.
Abstract:
The present invention relates to an apparatus and process for producing a thin organic film on a substrate using an ultrasonic nozzle to produce a cloud of micro-droplets in a vacuum chamber. The micro-droplets move turbulently within the vacuum chamber, isotropically impacting and adhering to the surface of the substrate. The resulting product has a smooth, continuous, conformal, and uniform organic thin film, when the critical process parameters of micro-droplet size, shot size, vacuum chamber pressure, and timing are well-controlled, and defects such as “orange peel” effect and webbing are avoided. The apparatus includes an improved ultrasonic nozzle assembly that comprises vacuum sealing and a separate, independent passageway for introducing a directed purging gas.
Abstract:
Deleting the onset of flooding of a surface of an ultrasonic atomizer having an ultrasonic transducer with liquid to be atomized, in particular liquid fuel in connection with heaters, wherein the natural resonance frequency of the vibrating ultrasonic transducer is monitored for changes in frequency, and a flooding signal reporting a flooded condition is produced when a drop in resonance frequency over a previously detected resonance frequency is detected whose rate of decrease exceeds a set minimum threshold.
Abstract:
A method and a circuit for exciting an ultrasonic generator comprises a control loop which includes the ultrasonic generator itself and a voltage-controlled oscillator. The control loop keeps the active power consumption to a desired value, which is compared in a comparator with the instantaneous active power consumption. One output of a further rectangular oscillator is connected to the control input of the voltage-controlled oscillator. The rectangular oscillator is put into operation if in the control loop there are no control oscillations or only those which are smaller than a predetermined threshold. The output of the rectangular oscillator is connected across one diode to the control input of the voltage-controlled oscillator and across another diode to the controlled input of comparator. The additional signal is applied to the voltage-controlled oscillator, apart from the control signal of the control loop. The cycle of the additional signal is longer than the change time constant at the control input of the voltage-controlled oscillator and the additional signal swing is selected in such a way that the frequency of oscillator passes through a predetermined frequency range.