A control system for an ultrasonic surgical device has a console operatively connected to a power source and configured for detachable connection to the ultrasonic surgical device. A control circuit of the console is configured to regulate an operating signal to correspond to the operating characteristics of the ultrasonic surgical handpiece in response to a loading signal. An operator input of the console operatively connects to the control circuit to provide a control signal.

A negative impedance circuit includes: a differential circuit stage; a positive feedback path from an output of the differential circuit stage to a first input of the differential circuit stage; and a negative feedback path from the output of the differential circuit stage to a second input of the differential circuit stage. The negative feedback path includes a first transistor, and a unitary gain path from the output of the differential circuit stage to the second input of the differential circuit stage, the unitary gain path coupled to ground via a reference impedance. The positive feedback path includes a second transistor. The first and second transistors are coupled in a current mirror arrangement and have respective control electrodes configured to be driven by the output of the differential circuit stage, where the negative impedance circuit causes a negative impedance at the first input of the differential circuit stage.

A noise generator for generating a noise signal over a frequency spectrum has a first noise source and a first digital filter for a first frequency band, a second noise source and a second digital filter for a second frequency band, and an interpolator and a combiner. The first digital filter has a first sample rate and the second digital filter has a second sample rate, wherein the ratio between the second sample rate and the first sample rate, with regard to a sign, corresponds to a ratio between center frequencies of the second frequency band and the first frequency band, wherein an edge of the second digital filters which determines a lower frequency band limit is steeper than an edge of the first digital filter which determines an upper frequency band limit. The interpolator is configured to adjust an output signal of the first digital filter, with regard to its sample rate, to a sample rate of the second digital filter, wherein the combiner is configured to combine the adjusted output signal from the interpolator and the output signal of the second digital filter.

A process for the ultrasonic treatment of mined sand proppant for hydraulic fracture treatment, the process comprising the steps of pumping sand particles in an aqueous fluid to an ultrasonic device operating at a suitable frequency and a suitable power range. The sand particles remain at a proximity to the ultrasonic device for a first predetermined period of time to remove contaminants from the sand particles.

An ultrasonic detection circuit includes a transmitter circuit that provides excitation signals to an ultrasonic transducer during an excitation interval. A control circuit includes a port to receive a command. The control circuit controls the frequency and the duty cycle of the excitation signals of the transmitter circuit during the excitation interval. The control circuit generates a first excitation signal sequence of the excitation interval followed by a first monitoring period to receive a first echo signal in response to the command. The control circuit generates a second excitation signal sequence of the excitation interval followed by a second monitoring period to receive a second echo signal in response to the command. The control circuit outputs results via the port based on at least one of the first or second echo signals received.

An ultrasonic vibrator driving apparatus applies a sine-waveform alternating voltage as a drive voltage via a conversion circuit to an ultrasonic vibrator that has a unique resonance frequency. A first current detector that detects a first current that flows from the drive voltage generator to the conversion circuit and a second current detector that detects a second current that flows from the conversion circuit to the ultrasonic vibrator are included. A frequency controller performs control on the drive voltage generator to change the frequency of a square-waveform alternating voltage so that the difference between the first current and the second current is reduced or approaches a minimum.

A phased array of ultrasonic transducers may create arbitrary fields that can be utilized to manipulate fluids. This includes the translation of drops on smooth surfaces as well speeding the evaporation of fluids on wetted hands. Proposed herein is the use airborne ultrasound focused to the surface of the hand. The risk is that coupling directly into the bulk of the hand may cause damage to the cellular material through heating, mechanical stress, or cavitation. Using a phased array, the focus may be moved around, thus preventing acoustic energy from lingering too long on one particular position of the hand. While some signaling may penetrate into the hand, most of the energy (99.9%) is reflected. Also disclosed are methods to couple just to the wetted surface of the hand.

A method for calibrating a second bonding machine based on a calibrated first bonding machine is disclosed. The first bonding machine includes a first ultrasonic transducer. The second bonding machine includes a second ultrasonic transducer and a power supply. The method includes providing a first electrical calibration supply that causes the first ultrasonic transducer to oscillate at a first calibration amplitude when it is damped by a mechanical damping, providing a second electrical calibration supply that causes the second ultrasonic transducer to oscillate at the same calibration amplitude when it is damped by the same mechanical damping. The second bonding machine is adapted to modify a second control signal based on a first electrical parameter of the first electrical calibration supply and on a second electrical parameter of the second electrical calibration supply in order to generate a modified second control signal, provide the modified second control signal to the power supply in order to cause the second power supply to generate a second electrical supply, and provide the second electrical supply to the second ultrasonic transducer.

A control circuit of an ultrasound diagnostic apparatus having an ultrasound endoscope controls a transmission circuit to generate a transmission signal, which includes a diagnostic driving pulse applied to each of a plurality of ultrasound transducers that generate ultrasound waves for acquiring an ultrasound image, in the case of acquiring the ultrasound image, and controls the transmission circuit to generate a polarization driving pulse, which has a polarization driving voltage different from voltage of the diagnostic driving pulse within the same settable voltage range as the diagnostic driving pulse and has a frequency different from a probe frequency band for acquiring the ultrasound image, in order to perform the polarization processing of the plurality of ultrasound transducers in the case of performing the polarization processing.

Vibration based on a sound is generated even in a case where the sound does not have a component of a low-frequency region. Envelope information regarding an envelope of a sound signal is derived, a frequency modulation and an amplitude modulation based on the envelope information are performed on a basic signal of waves having constant frequency and constant amplitude, and a vibration signal for vibrating a vibration generation device is generated.