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  • 1
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    Thin Layer Composite Unimorph Ferroelectric Driver and Sensor (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method for forming ferroelectric wafers is provided. A prestress layer is placed on the desired mold. A ferroelectric wafer is placed on top of the prestress layer. The layers are heated and then cooled causing the ferroelectric wafer to become prestressed. The prestress layer may include reinforcing material and the ferroelectric wafer may include electrodes or electrode layers may be placed on either side of the ferroelectric layer. Wafers produced using this method have greatly improved output motion.
    Keywords: Composite Materials
    Format: application/pdf
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  • 2
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    An interferometer having fused optical fibers, and apparatus and method using the interferometer (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An interferometer includes a first optical fiber coupled to a second optical fiber by fusing. At a fused portion, the first and second optical fibers are cut to expose respective cores. The cut or fused end of the first and second optical fibers is arranged to oppose a diaphragm or surface against which a physical phenomenon such as pressure or stress, is applied. In a first embodiment, a source light which is generally single-mode monochromatic, coherent light, is input to the first optical fiber and by evanescence, effectively crosses to the second optical fiber at the fused portion. Source light from the second optical fiber is reflected by the diaphragm or surface, and received at the second optical fiber to generate an output light which has an intensity which depends upon interference of reference light based on the source light, and the reflected light reflected from the diaphragm or surface. The intensity of the output light represents a positional relationship or displacement between the interferometer and the diaphragm or surface.
    Keywords: OPTICS
    Type: NAS 1.71:LAR-14640-1-CU
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  • 3
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    High-Temperature Microphone With Fiber-Optic Output (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Acoustic-pressure transducer (microphone) with fiber-optic output designed to withstand hot, loud, structurally vibrating environment like that of jet engine. Features flat frequency response out to frequencies well beyond several-kilohertz range needed to test for acoustic-pressure loads on engine structures.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-14640 , Laser Tech. Brief.; 2; 4; P. 106
    Format: text
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  • 4
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    Improved Piezoelectric Loudspeakers And Transducers (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Loudspeakers and related acoustic transducers of improved type feature both light weight and energy efficiency of piezoelectric transducers and mechanical coupling efficiency. Active component of transducer made from wafer of "rainbow" piezoelectric material, ceramic piezoelectric material chemically reduced on one face. Chemical treatment forms wafer into dishlike shallow section of sphere. Both faces then coated with electrically conductive surface layers serving as electrodes. Applications include high-fidelity loudspeakers, and underwater echo ranging devices.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-15138 , NASA Tech Briefs (ISSN 0145-319X); 19; 6; P. 42
    Format: text
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  • 5
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    Method of Fabricating a Piezoelectric Composite Apparatus (2003)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: A method for fabricating a piezoelectric macro-fiber composite actuator comprises providing a piezoelectric material that has two sides and attaching one side upon an adhesive backing sheet. The method further comprises slicing the piezoelectric material to provide a plurality of piezoelectric fibers in juxtaposition. A conductive film is then adhesively bonded to the other side of the piezoelectric material, and the adhesive backing sheet is removed. The conductive film has first and second conductive patterns formed thereon which are electrically isolated from one another and in electrical contact with the piezoelectric material. The first and second conductive patterns of the conductive film each have a plurality of electrodes to form a pattern of interdigitated electrodes. A second film is then bonded to the other side of the piezoelectric material. The second film may have a pair of conductive patterns similar to the conductive patterns of the first film.
    Keywords: Electronics and Electrical Engineering
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  • 6
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    Thin layer composite unimorph ferroelectric driver and sensor (2004)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A method for forming ferroelectric wafers is provided. A prestress layer is placed on the desired mold. A ferroelectric wafer is placed on top of the prestress layer. The layers are heated and then cooled, causing the ferroelectric wafer to become prestressed. The prestress layer may include reinforcing material and the ferroelectric wafer may include electrodes or electrode layers may be placed on either side of the ferroelectric layer. Wafers produced using this method have greatly improved output motion.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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  • 7
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    Method of Fabricating a Composite Apparatus (2007)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: A method for fabricating a piezoelectric macro-fiber composite actuator comprises making a piezoelectric fiber sheet by providing a plurality of wafers of piezoelectric material, bonding the wafers together with an adhesive material to from a stack of alternating layers of piezoelectric material and adhesive material, and cutting through the stack in a direction substantially parallel to the thickness of the stack and across the alternating layers of piezoelectric material and adhesive material to provide at least one piezoelectric fiber sheet having two sides comprising a plurality of piezoelectric fibers in juxtaposition to the adhesive material. The method further comprises bonding two electrically conductive films to the two sides of the piezoelectric fiber sheet. At least one conductive film has first and second conductive patterns formed thereon which are electrically isolated from one another and in electrical contact with the piezoelectric fiber sheet.
    Keywords: Composite Materials
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  • 8
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    Piezoelectric Vibrational and Acoustic Alert for a Personal Communication Device (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: An alert apparatus for a personal communication device includes a mechanically prestressed piezoelectric wafer positioned within the personal communication device and an alternating voltage input line coupled at two points of the wafer where polarity is recognized. The alert apparatus also includes a variable frequency device coupled to the alternating voltage input line, operative to switch the alternating voltage on the alternating voltage input line at least between an alternating voltage having a first frequency and an alternating voltage having a second frequency. The first frequency is preferably sufficiently high so as to cause the wafer to vibrate at a resulting frequency that produces a sound perceptible by a human ear, and the second frequency is preferably sufficiently low so as to cause the wafer to vibrate at a resulting frequency that produces a vibration readily felt by a holder of the personal communication device.
    Keywords: Communications and Radar
    Format: text
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  • 9
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    Ferroelectric Pump (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: A ferroelectric pump has one or more variable volume pumping chambers internal to a housing. Each chamber has at least one wall comprising a dome shaped internally prestressed ferroelectric actuator having a curvature and a dome height that varies with an electric voltage applied between an inside and outside surface of the actuator. A pumped medium flows into and out of each pumping chamber in response to displacement of the ferroelectric actuator. The ferroelectric actuator is mounted within each wall and isolates each ferroelectric actuator from the pumped medium, supplies a path for voltage to be applied to each ferroelectric actuator, and provides for positive containment of each ferroelectric actuator while allowing displacement of the entirety of each ferroelectric actuator in response to the applied voltage.
    Keywords: Mechanical Engineering
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  • 10
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    Ferroelectric Fluid Flow Control Valve (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: An active valve is controlled and driven by external electrical actuation of a ferroelectric actuator to provide for improved passage of the fluid during certain time periods and to provide positive closure of the valve during other time periods. The valve provides improved passage in the direction of flow and positive closure in the direction against the flow. The actuator is a dome shaped internally prestressed ferroelectric actuator having a curvature, said dome shaped actuator having a rim and an apex. and a dome height measured from a plane through said rim said apex that varies with an electric voltage applied between an inside and an outside surface of said dome shaped actuator.
    Keywords: Mechanical Engineering
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