Global ETD Search

51	Structure and properties of sputtered ZnO transducers. Fahmy, Aly Hassan. January 1971 (has links) No description available. Transducers Thin films
52	Bipedal locomotion ; a binary-decision approach to its control and actuation Küc̦ük, Artun C. January 1985 (has links) No description available. Robots. Electric controllers. Transducers.
53	Toward integrated, PVDF-TrFE fresnel zone plate transducers for intravascular pulse-echo applications Sleva, Michael Z. 12 1900 (has links) No description available. Transducers Integrals Fresnels
54	Analysis of tapered-thickness piezoelectric ceramics for ultrasonic transducers Barthe, Peter Girard 05 1900 (has links) No description available. Piezoelectric ceramics Piezoelectric transducers
55	A low differential pressure transducer Montemayor, Oscar Javier 12 1900 (has links) No description available. Transducers Fluid dynamics
56	Electroacoustics of a piezoelectric cylindrical transducer in a fluid-filled borehole Chiou, Chwei-Chi 05 1900 (has links) No description available. Piezoelectric transducers Electro-acoustics
57	An evaluation of monolithic phased arrays for Non destructive testing Campbell, M. A. January 1986 (has links) No description available. 621.37 Ultrasonic transducers in NDT
58	Capacitive Micromachined Ultrasonic Transducers: Design, Fabrication and Characterization Jeba, Dilruba Zaman 02 September 2014 (has links) Capacitive micromachined ultrasonic transducers (CMUTs) have been developed as an alternative to piezoelectric transducers for ultrasonic imaging in non-destructive testing applications. These CMUTs offer substantial advantages over their piezoelectric counterparts, which include a highly miniaturized system, easy integration with electronic control circuitry, a wider bandwidth, and a higher sensitivity. In this thesis, the design, fabrication and characterization of several single and array CMUT devices are reported. Many sizes of CMUTs, aiming to operate at different resonant frequencies, were fabricated using a PolyMUMPs sacrificial technique. An analytical and finite element model was used to further understanding of the physical behaviour of the transducer. The basic functionality of the CMUT devices was investigated through capacitance and electrical impedance measurements. These devices showed greater change in the capacitance and impedance data while operating close to their collapse voltages. This higher change in both capacitance and impedance is a result of a larger membrane displacement. The acoustic output power is directly related to the magnitude of the membrane’s displacement. The transducers performance thus can be enhanced by operating close to their collapse voltage and obtained higher sensitivity. The optical characterization, performed on the single devices and on the 1-D arrays, provided a better understanding of the membrane vibration modes and displacement profiles at different resonant frequency modes. Acoustic measurements were performed to demonstrate the transmission capability of the CMUTs. The generated acoustic signals were detected using a commercial detector. These acoustic experiments demonstrated that these CMUTs can potentially be used as ultrasonic transducers alternative to piezoelectric transducers. CMUT Transducers MEMS Ultrasonic
59	The simultaneous measurement of time-resolved surface heat flux and freestream turbulence at a stagnation point / Simmons, Stephen Gordon, January 1990 (has links) Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1990. / Vita. Abstract. Includes bibliographical references (leaves 88-91). Also available via the Internet. Heat Heat flux transducers.
60	Development of a low cost shock pressure sensor Abbas, Syed Farhat. January 1988 (has links) Thesis (M.S.)--Ohio University, March, 1988. / Title from PDF t.p. Transducers. Stress waves

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