Week 1 - Jun 27 - Jul 6

Chapter 5 notes

Notes on other Papers

Summary

Week 2 - Jul 6 - Jul 13

“Fabrication of Anodically Bonded CMUT With Vacuum-Sealed Cavities” (2014)

COMSOL Simulation Understanding

⇒ With CMUT simulation with errors in transition from Conventional to Collapsed Mode

Week 3 - Jul 13 - Jul 19

• Change Material / Parameters as in paper

• Use CMUTDE~1.MPH file to find collapse radius

  • use param value to back-track collapse voltage in 1D Plot Group 4
  • use that param value to find collapse radius on 1D Plot Group 3
  • visualize collapse-mode performance on 2D Plot Group 1

  ⇒ check what extra parameters do in email

• Use collapse-radius value from CMUTDE~1.MPH to find Pressure vs Frequency graph

  • Click on most red part for 1 ~ 30 MHz frequency values (maximum Intensity)

berthillier_m._dynamic_2011-author.pdf

We consider a generic circular membrane that we will use through all the simulations described in this paper. It is a polysilicon membrane of 1,5 µm thickness and 25 µm radius. The electrode radius is 20 µm and the air gap height is 0,3 µm. Collapse voltage has been calculated to 106 V and the bias voltage Udc is equal to 95 V (90% of the collapse voltage). Alternating voltage Uac is equal to 1 V. Water is the acoustic radiation medium

Week 4~Week 6 - Jul 21 - Aug 16

• Calculate necessary resistance and capacitance values for AC and DC connections on ordered CMUT

• July 21 : solder parts together + epoxy on gold wires

  

  • epoxy leak towards device (might become a problem)

• July 22 : oil immersion experiment

  • no results found
  • realized circuitry was wrong in the first place