Sökning: "transducers"

Visar resultat 6 - 10 av 116 avhandlingar innehållade ordet transducers.

  1. 6. Polymide V-groove joints for three - dimensional silicon transducers

    Författare :Thorbjörn Ebefors; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  3. 7. Integration of graphene into MEMS and NEMS for sensing applications

    Författare :Xuge Fan; Frank Niklaus; Peter Steeneken; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Micro-electromechanical systems MEMS ; Nano-electromechanical systems NEMS ; heterogeneous 3D integration; Graphene; single-layer graphene; double-layer graphene; bilayer graphene; chemical vapor deposition CVD ; suspended graphene beams; suspended graphene membranes; doubly clamped; fully clamped; silicon on insulator SOI ; vapor hydrofluoric acid VHF ; Young’s modulus; built-in stress; built-in tension; piezoresistivity; gauge factor; accelerometer; resonators; electromechanical sensing; advanced transducers; humidity; gas sensing; sensitivity; CO2 sensing; graphene grain boundary; line defects; optical microscopy; wire bonding; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : This thesis presents a novel approach to integrate chemical vapor deposition (CVD) graphene into silicon micro- and nanoelectromechanical systems (MEMS/NEMS) to fabricate different graphene based MEMS/NEMS structures and explore mechanical properties of graphene as well as their applications such as acceleration sensing, humidity sensing and CO2 sensing. The thesis also presents a novel method of characterization of CVD graphene grain boundary based defects. LÄS MER

  4. 8. Transducers for impact force and mechanical impedance based on strain measurement

    Författare :Karl-Gustaf Sundin; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : Transducers for impact force and mechanical point impedance are studied. In both cases the transducers are based on resistive strain measurement. Two prototypes of impact force transducers based on different concepts of mean strain measurement are developed and tested. The results are satisfactory and show that the suggested concepts are suitable. LÄS MER

  5. 9. Active Health Monitoring of Aerospace Composite Structures by Embedded Piezoceramic Transducers

    Författare :Christophe Paget; KTH; []
    Nyckelord :embedded; piezoceramic; piezoelectric; transducer; composite; structural; integrity; health monitoring; damage detection; Lamb waves; wavelets; normal-mode expansion; FE-method; SLMT;

    Sammanfattning : The objectives of the thesis work were to study theinteraction between embedded piezoceramic transducers andcomposite structures as well as determine techniques tosimplify the Lamb waves analysis. Firstly, this studyconsidered the design of the embedded piezoceramic transducers. LÄS MER

  7. 10. Gap Discharge Transducers in a Transit Time Flow Measurement System Designed for Harsh Environments

    Författare :Kristoffer Karlsson; Per Lunde; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Industriell elektronik; Industrial Electronics;

    Sammanfattning : In this thesis, the potential of the gap discharge transducer is investigated as transducers in a time-of-flight gas flow measurement setup designed for harsh environments.In this thesis the gap discharge transducer is operated in two different modes, named spark discharge transducer and glow discharge transducer. LÄS MER