Abstract:
A phased ultrasonic transducer and method for transmitting sound or ultrasound through a gaseous medium into a solid spectrum with ultrasound beam steering and focusing.
Abstract:
An ultrasonic actuation apparatus includes a piezoelectric transducer producing a first ultrasonic signal; a second transducer; and a platen, the platen being directly and/or acoustically coupled to the piezoelectric transducer and the second transducer. The second transducer may be a MEMS microphone. The second transducer is configured to receive the first ultrasonic signal at a first time, and a second ultrasonic signal at second time. The second ultrasonic signal has been modified from the first ultrasonic signal in correspondence with an object being in contact with the platen.
Abstract:
A control console (50) for a powered surgical tool (330). The console includes a transformer (250) that supplies the drive signal to the surgical tool. A linear amplifier (115) with active resistors (162, 184), selectively ties the ends of the transformer primary winding between ground and the open circuit state. Feedback voltages from the transformer windings regulate the resistances of the active resistors.
Abstract:
Bei einem handgeführten Elektrowerkzeug (100) mit einer Antriebseinheit (103) zum schwingenden Antrieb eines Einsatzwerkzeugs (130), die mindestens einen schwingfähigen Anregungsaktor (105) aufweist, der mit einem Koppelelement (110) zur Übertragung von Schwingungen auf das Einsatzwerkzeug (130) gekoppelt ist, die vom Anregungsaktor (105) im Betrieb der Antriebseinheit (103) beim Anlegen einer vorgegebenen Ansteuerspannung an den Anregungsaktor (105) erzeugt werden, wobei der Anregungsaktor (105) mindestens ein Anregungselement (132, 134) aufweist, das aus einem piezoelektrischen Material ausgebildet ist, ist dem Anregungsaktor (105) zur Erfassung seiner jeweils aktuellen Betriebstemperatur ein Temperatursensor (199) zugeordnet, um eine von der jeweils aktuellen Betriebstemperatur abhängige Anpassung der vorgegebenen Ansteuerspannung zu ermöglichen.
Abstract:
An apparatus comprises an ultrasonic transducer having a first and second electrode and switches which configured to selectively connect the first and second electrodes to a transmit voltage source or to a receive amplifier. The switches are configured to selectively connect a first input of the amplifier to the first electrode of the transducer and to selectively connect a second input of the amplifier to the second electrode of the transducer. The switches are also configured to selectively connect the voltage source to the first and second electrodes of the transducer. The transducer may include a piezoelectric layer attached to and sandwiched between the first electrode and the second electrode, and a flexible membrane attached to the first electrode. The piezoelectric layer may be patterned to form an annular ring at the outer diameter of the flexible membrane.
Abstract:
In an embodiment, a transducer device comprises a flexible substrate and a plurality of tiles coupled to the substrate. The tiles each include a plurality of piezoelectric transducer elements and a base adjoining and supporting the plurality of piezoelectric transducer elements. The substrate has disposed therein or thereon signal lines to serve as a backplane for communication to, from and/or among integrated circuitry of the tiles. In another embodiment, the integrated circuitry of the tiles are each pre-programmed to implement any of a respective plurality of operational modes. Signals exchanged with the tiles via the flexible substrate facilitate operation of the transducer device to provide a phased array of transducer elements.
Abstract:
Embodiments of the invention include improved radioirequency (RF) pulse amplifier systems that incorporate an energy array comprising multiple capacitors connected in parallel. The energy array extends the maximum length of pulses and the maximum achievable peak power output of the amplifier when compared to similar systems. Embodiments also include systems comprising the amplifier configured to drive a load, wherein the load may include one or more ultrasound (e.g., piezoelectric) transducers. Related methods of using the amplifier are also provided.
Abstract:
Delay line memory device, systems and methods are disclosed. In one aspect, a delay line memory device includes a substrate; an electronic unit disposed on the substrate and operable to receive, amplify, and/or synchronize data signals into a bit stream to be transmitted as acoustic pulses carrying data stored in the delay line memory device; a first and a second piezoelectric transducer disposed on the substrate and in communication with the electronic unit, in which the first piezoelectric transducer is operable to transmit the data signals to the acoustic pulses that carry the data through the bulk of the substrate, and the second piezoelectric transducer is operable to transduce the received acoustic pulses to intermediate electrical signals containing the data, which are transferred to the electronic unit via an electrical interconnect to cause refresh of the data in the delay line memory device.