Abstract:
Methods for monitoring scale deposition in a water-containing industrial process are disclosed. In certain embodiments, the water-containing industrial process is an aqueous cooling system. In certain embodiments, the methods incorporate fluorometric monitoring and control techniques along with a piezoelectric microbalance sensor. A particular embodiment of a piezoelectric microbalance sensor is additionally disclosed, along with at least one method for using the particular embodiment that is independent of whether fluorometric monitoring and control techniques are utilized.
Abstract:
Printed circuit board 601, 603 comprises a piezoelectric transformer 101 including a piezoelectric element 506 with a primary side electrode pair 507A, 507B and a secondary side electrode 508, an electrically conductive resistor 515 formed from a conductive coating connecting the primary side electrode pair, and a slit 610 formed in the circuit board at a location between a first position where the primary side electrode pair is connected to the circuit board and a second position where the secondary side electrode is connected to the circuit board, and the location being different from a position facing the conductive resistor connected to the circuit board. A discharge current is discharged via the resistor 515 to protect a semiconductor component from the discharge current. Since neither a short-circuit terminal nor conductive jig is required, electrostatic discharge damage to a semiconductor component can be prevented by a low-cost arrangement.
Abstract:
Low frequency pulse-echo ultrasonic transducers are provided especially suited for use in downhole cement bond evaluation, but usable for various applications. One frequency pulse-echo ultrasonic transducer comprises a transducer stack having alternating layers of a piezoceramic element and an ultrasonic attenuating element that is preferably acoustic impedance matched to the piezoceraniic elements in order to reduce the Q of the transducer stack. Another low frequency pulse-echo ultrasonic transducer comprises an assembly having the present transducer stack disposed on an acoustic attenuating backing and a front face. Yet another low frequency pulse-echo ultrasonic transducer comprises a transducer composite made from a lead metaniobate. Still another frequency pulse-echo ultrasonic transducer comprises a composite stack. A further low frequency pulse-echo ultrasonic transducer comprises a composite stack, wherein multiple drive elements allow driving individual elements at different times. The transducers may be driven in a multiple-pulse time delayed manner.
Abstract:
A piezoelectric transformer 101 includes a piezoelectric element 506. Two primary side electrodes 507A, 507B exist on the primary side of the piezoelectric element 506. The primary side electrodes 507A, 507B are coupled by a resistor 515 formed from a conductive coating. A discharge current is discharged via the resistor 515 to protect a semiconductor component from the discharge current. Since neither a short-circuit terminal nor conductive jig is required, electrostatic discharge damage to a semiconductor component can be prevented by a low-cost arrangement.
Abstract:
Provided are a piezoelectric device that allows for an improvement in the power durability of an electrode formed on a piezoelectric thin film and a significant reduction in etchant concentration or etching time and a method for manufacturing such a piezoelectric device. Among a +C plane (22) on the +Z axis side of a piezoelectric thin film (20) and a -C plane (12) on the -Z axis side of the piezoelectric thin film (20), the -C plane (12) on the -Z axis side of the piezoelectric thin film (20) is etched. Thus, -Z planes (21) of the piezoelectric thin film (20) on which epitaxial growth is possible are exposed. Ti is epitaxially grown on the -Z planes (21) of the piezoelectric thin film (20) in the -Z axis direction such that the crystal growth plane thereof is parallel to the -Z planes (21) of the piezoelectric thin film (20). Al is then epitaxially grown on the surface of the Ti electrode (65) in the -Z axis direction such that the crystal growth plane thereof is parallel to the -Z planes (21) of the piezoelectric thin film (20).
Abstract:
An ultrasonic piezoelectric transducer device includes a transducer array consisting of an array of vibrating elements, and a base to which the array of vibrating elements in the transducer array are attached. The base include integrated electrical interconnects for carrying driving signals and sensed signals between the vibrating elements and an external control circuit. The base can be an ASIC wafer that includes integrated circuitry for controlling the driving and processing the sensed signals. The interconnects and control circuits in the base fit substantially within an area below the array of multiple vibrating elements.
Abstract:
L'invention se rapporte à un résonateur (1, 11) thermocompensé comportant un corps (5, 15) utilisé en déformation, l'âme (8, 18) du corps (5, 15) étant formé par de la céramique. Selon l'invention, au moins une partie du corps (5, 15) comporte au moins un revêtement (2, 4, 6, 12, 14, 16) dont les variations du module d'Young en fonction de la température ( CTE ) sont de signe opposé à celles ( CTE ) de la céramique utilisée pour l'âme (8, 18) afin de permettre audit résonateur d'avoir une variation de fréquence en fonction de la température au moins au premier ordre (α, β) sensiblement nulle. L'invention concerne le domaine des pièces d'horlogerie.
Abstract:
Ein Piezoinjektor (12) mit einem Piezoaktor (14) ist so auszugestalten, dass bei einer blockierten externen Entladung des Piezoaktors (14) dieser selbstständig seine elektrische Ladung abbaut und diese Funktion bei der Herstellung des Piezoinjektors (12) kostengünstig zu verwirklichen ist. Der Piezoinjektor (12) weist zum Piezoaktor (14) führende elektrische Kontaktelemente (26) auf, die zum einen in einem Anschlußstecker (18) und zum anderen in einem davon getrennten Kontaktträger (22) gelagert sind. Durch die Ausfertigung des Anschlußsteckers (18) oder des Kontaktträgers (22) aus einem elektrisch leitfähigem Kunststoff entsteht ein elektrischer Pfad zwischen den Kontaktelementen (26) in der Funktion eines diskreten hochohmigen Widerstandes, der die selbsttätige Entladung des Piezoaktors (12) ermöglicht. Der Piezoinjektor (12) findet vorzugsweise Anwendung zur Einspritzung von Kraftstoff in den Brennraum eines Verbrennungsmotors eines Kraftfahrzeugs.
Abstract:
A resonator is provided with a tuning element based on piezoelectricity. The piezoelectric basic element includes at least one piezoelectric layer and a metal layer. Such a basic element is first coated with a thin insulating layer and then with a good conductor. The thickness of the conductive coating is greater than the skin depth of a field corresponding to the operating frequency of the structure in the conductor. The tuning element formed in this manner is fastened on, e.g., some inner surface of the resonator cavity and acts to change the natural frequency of the resonator by electric control. When using the tuning element, no mechanical arrangement is required for moving the tuning element. Furthermore, the tuning element does not cause considerable dielectric losses nor intermodulation when being in a radiofrequency electromagnetic field, because the field cannot significantly penetrate through said conductive coating into the piezoelectric material.