Abstract: A micro-machined ultrasonic transducer substrate for immersion operation is formed by a particular arrangement of a plurality of micro-machined membranes that are supported on a silicon substrate. The membranes, together with the substrate, form surface microcavities that are vacuum sealed to provide electrostatic cells. The cells can operate at high frequency and can cover a broader bandwidth in comparison with conventional piezoelectric bulk transducers.

Abstract: An ultrasonic imaging probe is provided which is capable of capturing “on-the-fly” scanning planes in successive positions of the probe so as to form a volumetric image representation at a real time frame rate. The probe includes a flexible sealing membrane for a coupling fluid. Laterally extending folding portions of the flexible membrane provide fluid isolation and cancellation of parasitic constraining forces normally generated during probe movement.

Abstract: A micro-machined ultrasonic transducer substrate for immersion operation is formed by a particular arrangement of a plurality of micro-machined membranes that are supported on a silicon substrate. The membranes, together with the substrate, form surface microcavities that are vacuum sealed to provide electrostatic cells. The cells can operate at high frequency and can cover a broader bandwidth in comparison with conventional piezoelectric bulk transducers.

Abstract: A micro-machined ultrasonic transducer substrate for immersion operation is formed by a particular arrangement of a plurality of micro-machined membranes that are supported on a silicon substrate. The membranes, together with the substrate, form surface microcavities that are vacuum sealed to provide electrostatic cells. The cells can operate at high frequency and can cover a broader bandwidth in comparison with conventional piezoelectric bulk transducers.

Abstract: A capacitive micro-machined ultrasonic transducer (CMUT) array includes an improved elementary aperture for imaging operations. The transducer can be of a linear, curved linear, annular, matrix or even single surface configuration. The elementary apertures thereof are formed by a specific arrangement of capacitive micromachined membranes (CMM) so as to exhibit ideal acoustical and electrical behavior when operated with imaging systems. The CMM arrangements can be either conventional where the element transducers of the array are uniformly shaped by predefined CMMs in a manner such as to exhibit acoustic behavior similar to a piezoelectric transducer, or can be more sophisticated, wherein each element transducer is formed by a specific combination of different CMMs (i.e., of a different size and/or shape) so as to provide the transducer with built-in acoustic apodization that can be implemented in the azimuth and/or elevation dimension of the device.

Abstract: A motorized scanhead device is capable of rotating an array transducer through 360 degrees of angular rotation in a manner such as to provide acquisition of images in successive scanning planes arranged around the principal axis of the device. The device can be incorporated in endoscopes (e.g., transesophageal endoscopes), laparoscopes, endocavity or intracavity probes so as to provide an expanded angle of vision or to render 3D images, without the need for external movement of the device. The motorized scanhead device includes a motor that is isolated from the transducer signal interconnections in order to minimize electrical discharges associated with motor operation and to provide more room between an associated probe housing and the scanhead device.

Abstract: A process is provided for cleaning a surface of an internal cavity of a gas turbine component having sulfidation or sulfur bearing deposits comprising: inserting into the internal cavity a fluoride salt; and heating the fluoride salt and the component in an inert atmosphere for a time and at a temperature to clean the sulfidation or sulfur bearing deposits on the surface. In a preferred embodiment the cleaned internal surface is then coated with a metallic coating.

Abstract: An ultrasonic imaging probe is provided which is capable of capturing “on-the-fly” scanning planes in successive positions of the probe so as to form a volumetric image representation at a real time frame rate. The probe includes a flexible sealing membrane for a coupling fluid. Laterally extending folding portions of the flexible membrane provide fluid isolation and cancellation of parasitic constraining forces normally generated during probe movement.

Abstract: Ultrasonic probe devices are provided which are particularly suitable for use as invasive imaging probes such as endocavity probes and endoscopic probes. The probe devices include a dual cross-scanning bi-plane array transducer formed by a pair of orthogonal, intersecting transducer arrays. The probe devices are capable of providing, either simultaneously or alternately, crossing scanning through a single symmetrical scanning axis.

Abstract: A micro-machined ultrasonic transducer substrate for immersion operation is formed by a particular arrangement of a plurality of micro-machined membranes that are supported on a silicon substrate. The membranes, together with the substrate, form surface microcavities that are vacuum sealed to provide electrostatic cells. The cells can operate at high frequency and can cover a broader bandwidth in comparison with conventional piezoelectric bulk transducers.

Abstract: A method is provided for manufacturing crossing/intersecting transducer arrays including first and second ultrasonic transducer arrays which intersect centrally of one another. Each transducer operates independently without any decrease in acoustic performance. The first and second arrays have their own independent signal electrodes, respectively disposed on the front and rear surfaces of the device. Because the arrays are built on a unique piezoelectric member, a portion of signal electrode of each array is adapted to be connected to ground in a manner permitting proper operation of the entire array. A method of forming matching layer sets incorporating electrical interconnections is also provided.

Abstract: Ultrasonic probe devices are provided which are particularly suitable for use as invasive imaging probes such as endocavity probes and endoscopic probes. The probe devices include a dual cross-scanning bi-plane array transducer formed by a pair of orthogonal, intersecting transducer arrays. The probe devices are capable of providing, either simultaneously or alternately, crossing scanning through a single symmetrical scanning axis.

Abstract: The present invention relates to and uses, in order to prevent crude oil from “congealing” in a transportation line, a controlled-crosslinking thermal insulation gel, i.e. relatively fluid at the start and developing in-situ gelation in lines only under certain conditions, temperature conditions among other things. In order to obtain controlled crosslinking, it is possible to carry out 1) Physical crosslinkings, i.e. physical bonds between polymers—completely reversible bonds by thermal effect and/or mechanical shear—and 2) Chemical crosslinkings: monomers or polymers having functions allowing chemical bonds to be established between polymers.

Abstract: An ultrasonic endoscopic probe tip device which provides signals to an imaging system for transesophageal diagnosis includes a removable housing adapted to be attached to the distal end of an endoscope. A rotatable, ball-bearing-mounted phased array transducer within the housing is rotatable around its acoustic propagation axis through multiple turns. The transducer is driven by an immersed micro-motorized drive. A torque limiting gearbox couples the drive to the transducer. A position encoder provides the imaging system with transducer position information over a 360° range. An automatic transducer position locking/unlocking system is used to lock the transducer in a selected rotational position.

Abstract: A method is provided for producing a matrix array ultrasonic transducer having an integrated interconnection assembly. A piezoelectric member, formed by a plurality of individual elemental transducers arranged in M×N matrix configuration, is provided and an interconnect interface device is joined to the rear face of the piezoelectric member. A plurality of printed circuits are then attached to the interconnect device so as to enable the resultant transducer array to be electrically connected to an external cable. The interconnect device is formed by an insulator member having dimensions in accordance with those of the piezoelectric member. A drilling operation is performed on the insulator member to form a corresponding array of through holes. The insulator member is then metallized and a resin used to provide filling of the through holes. Grooves are formed in at least one face of the insulator for receiving the printed circuits.

Abstract: A method is provided for manufacturing crossing/intersecting transducer arrays including first and second ultrasonic transducer arrays which intersect centrally of one another. Each transducer operates independently without any decrease in acoustic performance. The first and second arrays have their own independent signal electrodes, respectively disposed on the front and rear surfaces of the device. Because the arrays are built on a unique piezoelectric member, a portion of signal electrode of each array is adapted to be connected to ground in a manner permitting proper operation of the entire array. A method of forming matching layer sets incorporating electrical interconnections is also provided.

Abstract: An ultrasonic endoscopic probe tip device which provides signals to an imaging system for transesophageal diagnosis includes a removable housing adapted to be attached to the distal end of an endoscope. A rotatable, ball-bearing-mounted phased array transducer within the housing is rotatable around its acoustic propagation axis through multiple turns. The transducer is driven by an immersed micro-motorized drive. A torque limiting gearbox couples the drive to the transducer. A position encoder provides the imaging system with transducer position information over a 360° range. An automatic transducer position locking/unlocking system is used to lock the transducer in a selected rotational position.

Abstract: A catheter-based ultrasonic transducer array is provided which includes a piezoelectric member sandwiched between matching layers and a backing member. A flexible stiffening element or elements is embedded in the backing member. The element is opaque to radio frequencies and integrated along the azimuthal axis of the array so as to enable a user to view the element in an image of the array derived from the array output and thus determine the angular position of the array. A flexible interconnection assembly provides an electrical connection between the electrodes of the piezoelectric member and external cabling. Different methods are provided for adding a surrounding protective cover to the array.

Abstract: A method is provided for producing a matrix array ultrasonic transducer having an integrated interconnection assembly. A piezoelectric member, formed by a plurality of individual elemental transducers arranged in M×N matrix configuration, is provided and an interconnect interface device is joined to the rear face of the piezoelectric member. A plurality of printed circuits are then attached to the interconnect device so as to enable the resultant transducer array to be electrically connected to an external cable. The interconnect device is formed by an insulator member having dimensions in accordance with those of the piezoelectric member. A drilling operation is performed on the insulator member to form a corresponding array of through holes. The insulator member is then metallized and a resin used to provide filling of the through holes. Grooves are formed in at least one face of the insulator for receiving the printed circuits.

Abstract: An ultrasonic endoscopic probe tip device which provides signals to an imaging system for transesophageal diagnosis includes a removable housing adapted to be attached to the distal end of an endoscope. A rotatable, ball-bearing-mounted phased array transducer within the housing is rotatable around its acoustic propagation axis through multiple turns. The transducer is driven by an immersed micro-motorized drive. A torque limiting gearbox couples the drive to the transducer. A position encoder provides the imaging system with transducer position information over a 360° range. An automatic transducer position locking/unlocking system is used to lock the transducer in a selected rotational position.