An ultrasonic apparatus including a plurality of channels, each includes a transmission channel configured to generate and output a transmission signal based on a synchronization signal; a transducer element configured to convert the transmission signal output from the transmission channel into an ultrasonic signal and output the ultrasonic signal; a transceiver switching circuit configured to attenuate and output the transmission signal output from the transmission channel, and to output a reception signal that returns after the ultrasonic signal is transmitted to an object and is reflected from the object; and a reception channel configured to receive the attenuated output transmission signal and the output reception signal, and to detect transmission waveform information based on the attenuated transmission signal. The ultrasonic apparatus may further include a controller configured to store reference waveform information according to a transmission condition, and to compare the detected transmission waveform information with the reference waveform information.

A device and a method for generating percussive pulses or vibrations for a construction machine, in which a piston is reversibly reciprocated in a working space in a housing between a first reversal point and a second reversal point, wherein, for the purpose of generating the percussive pulses or vibrations, the piston is set into a reversible movement by a pressure fluid and the pressure fluid is led into and out of the working space in the region of the first reversal point and the second reversal point. The position of the piston is detected by way of a sensor, in that depending on the detected position of the piston a control unit controls at least one controllable valve, through which pressure fluid is led into and/or out of the working space, wherein by the control unit the movement of the piston is controlled.

A method for identifying a mechanical impedance of an electromagnetic load may include generating a waveform signal for driving an electromagnetic load, the waveform signal comprising a first tone at a first driving frequency and a second tone at a second driving frequency. The method may also include during driving of the electromagnetic load by the waveform signal or a signal derived therefrom, receiving a current signal representative of a current associated with the electromagnetic load and a back electromotive force signal representative of a back electromotive force associated with the electromagnetic load. The method may further include determining amplitude and phase information of the current signal responsive to the first tone and second tone, determining amplitude and phase information of the back electromotive force signal responsive to the first tone and second tone, and identifying parameters of the mechanical impedance of the electromagnetic load based on the amplitude and phase information of the current signal and the amplitude and phase information of the back electromotive force signal.

In a vibration unit, a first electrode of a sensor circuit of a control unit is electrically connected to a first external electrode-of a first piezoelectric element, a second electrode of the sensor circuit is electrically connected to a second external electrode of the first piezoelectric element, a first electrode of a drive circuit is electrically connected to a first external electrode of a second piezoelectric element, and a second electrode of the drive circuit is electrically connected to a second external electrode of the second piezoelectric element. Only a relatively small voltage induced by an electromotive force occurring due to the flexure of the first piezoelectric element is applied to the sensor circuit. In addition, only a relatively large drive voltage to be applied to the second piezoelectric element is applied to the drive circuit.

The present invention relates to an ultrasonic machine tool comprising a first sonotrode (2) with a first resonant frequency f.sub.1, a first converter (4) which is connected to the first sonotrode (2), and a generator (1) with a generator output for generating a first electrical alternating voltage with the first frequency f.sub.1 and for outputting the first electrical alternating voltage at the generator output, the generator output being connected to the first converter (4). According to the invention, a second sonotrode (3) with a second resonant frequency h and a second converter (5) which is connected to the second sonotrode (3) are provided, wherein the generator output is connected to the second converter (5) and the generator (1) is designed to produce a mix signal which has the first electrical alternating voltage and a second electrical alternating voltage with the second frequency h, and to output the mix signal at the generator output, and wherein the first frequency f.sub.1 and the second frequency f.sub.2 differ from one another.

An ultrasound transducer unit including a plurality of ultrasound transducers transmits and receives ultrasound waves to and from an inside of a subject. In a case where a checking operation unit is operated, a controller controls a driving voltage supply unit such that a driving voltage is supplied with all of the plurality of ultrasound transducers as driving target transducers. In a case where the checking operation unit is operated, a depolarization determination unit calculates, for each ultrasound transducer, a reception sensitivity in a case where an ultrasound wave is received by driving all of the plurality of ultrasound transducers as the driving target transducers, and determines whether or not a depolarization determination value calculated from the reception sensitivity of each ultrasound transducer satisfies numerical conditions. If the numerical conditions are satisfied, a polarization voltage supply unit supplies a polarization voltage to each of the plurality of ultrasound transducers.

There is provided a device for testing ultrasound probes comprising a plurality of transducing elements, said device comprising a plurality of ultrasound transmitter/receiver circuits, a computing device and a control device arranged to control the transmitter/receiver circuits and the computing device arranged to select an interrogation protocol from a plurality of different interrogation protocols, where each interrogation protocol comprises instructions for the order in which the plurality of transmitter/receiver circuits shall send voltage pulses to the transducers of the ultrasound probe.

An acoustic levitation system contains an acoustic transducer array emitting acoustic energy of periodically varying intensity. The acoustic transducer array includes a set of transducer elements arranged on a surface extending in at least two dimensions. The transducer elements are controllable in response to a control signal so as to emit the acoustic energy at a wavelength and a phase delay determined by the control signal. A controller generates the control signal such that an acoustic channel comprising one or more high-pressure region enclosing a continuous pressure minimum region that extends along a defined channel path from a start position to an end position. The continuous pressure minimum region enclosed by the one or more high-pressure region represents a trap volume suitable for carrying, levitating and translating matter in a contactless manner.

An assembly including: a printed circuit board (PCB) having a first surface and a second surface; at least one energy transmitter mounted on the first surface; at least one cooling element associated with the PCB second surface, wherein the cooling element is configured to cool the at least one energy transmitter via the PCB.

An ultrasonic apparatus includes an ultrasonic transducer, a transmitting circuit, a receiving circuit, a Q-factor measuring circuit, and a frequency measuring circuit. The ultrasonic transducer is a three-terminal ultrasonic transducer that includes a transmitting electrode, a receiving electrode, and a common electrode. The transmitting circuit outputs a driving signal to the transmitting electrode to cause the ultrasonic transducer to transmit ultrasonic waves. The receiving circuit receives a receive signal from the receiving electrode. The frequency measuring circuit measures a resonant frequency of the ultrasonic transducer from a reverberation signal in the receive signal. The Q-factor measuring circuit measures a Q factor of the ultrasonic transducer from the reverberation signal in the receive signal.