Blar i USN Open Archive på forfatter "Bolstad, Per Kristian"

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    • Acoustic Characterization of Inhomogenous Layers using Finite Element Method 

      Bolstad, Per Kristian; Manh, Tung; Frijlink, Martijn; Hoff, Lars (Peer reviewed; Journal article, 2021)
      This study presents a finite element approach to estimate acoustic parameters of layers of arbitrary compositions using 2D and 3D models. In this approach the resonance frequency of a layer to be investigated is found by ...

    • Characterization of Layers with Metal-Coated Polymer Spheres for use in Ultrasound Transducers 

      Nicolaisen, Anette Sollien (Master thesis, 2021)
      The properties of materials used in ultrasound transducers affect the properties of the finished transducer, making it important to characterize the acoustic properties of these materials. The study in this thesis is ...

    • Evaluation of Metallurgical Bonding for Ultrasound Transducers 

      Bolstad, Per Kristian (Doctoral dissertations at the University of South-Eastern Norway;188, Doctoral thesis, 2024)
      Common ultrasound transducers use a piezoelectric element to convert between electrical and mechanical energy. The piezoelectric layer is sandwiched between acoustic matching and backing layers to maximize energy transfer ...

    • Fabrication and Characterization of a Low-Frequency Array for a Hybrid PZT-CMUT Transducer 

      Siu, Hoi Yi (Master thesis, 2021)
      Piezocomposite materials consist of a periodic structure of active piezoelectric materials and passive polymer materials. Piezocomposite material is widely used in medical ultrasound transducers due to the advantages of ...

    • Impact of High Pressures on Au-Sn Solid Liquid Interdiffusion (SLID) Bonds 

      Bolstad, Per Kristian; Kuziora, Stephane; Nguyen, Hoang-Vu; Manh, Tung; Aasmundtveit, Knut; Hoff, Lars (Chapter, 2020)
      This paper investigates the influence of high pressure on Au-Sn solid-liquid interdiffusion (SLID) bonds formed by bonding Si substrates to dies of either lead-zirconate titanate (PZT) with high surface roughness or Si ...

    • Intermetallic bonding as an alternative to polymeric adhesives in ultrasound transducers 

      Bolstad, Per Kristian; Le, Anh Duy; Hoff, Lars; Manh, Tung (Peer reviewed; Journal article, 2019)
      Common ultrasound transducers utilize epoxy for bonding the active piezoelectric to the rest of the acoustic stack. This paper explores some of the potential benefits of replacing this soft epoxy layer with a harder ...

    • Miniature Highly Sensitive Ultrasound Doppler Transducers 

      Bolstad, Per Kristian (Master thesis, 2017)
      The ultrasound transducer is considered a critical and important part of any ultrasonic measurement system. The transducer is the part of the system that transmits and receives soundwaves by converting electrical energy ...

    • Ultrasound Transducers for High Pressure Environments Up to 1000 Bar 

      Bolstad, Per Kristian; Manh, Tung; Midtseter, Nils; Frijlink, Martijn Egbert; Hoff, Lars (Peer reviewed; Journal article, 2020)
      This paper studies the influence of high ambient pressure on ultrasound transducers where the piezoelectric layer is bonded to the acoustic matching layer by two different methods: Au-Sn solid-liquid interdiffusion and ...