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The defense date of the thesis is 2017-02-21
The current date is 2019-04-24
This thesis will be accessible at 2022-02-21
URN etd-0220117-172015 Statistics This thesis had been viewed 43 times. Download 0 times. Author Ming-kuei Chi Author's Email Address No Public. Department Mechanical Engineering Year 2016 Semester 1 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 56 Title The Simulation and Analysis of Ultrasonic Fingerprint Sensor Keyword FINGERPRINT SCANNER ULTRASONIC ULTRASONIC FINGERPRINT SCANNER Abstract After proposing fingerprint recognition for unlock technology in iPhone 5s, fingerprint recognition suddenly attracts many attentions. Mobile device or personal computer manufacturers are all looking for fingerprint identification solutions. Ultrasonic fingerprint scanner has higher recognition resolution compared to optical scanner and solid state scanner; therefore this thesis aims to study the optimal operation frequency of ultrasonic fingerprint scanner as well as effects of platen material and layer thickness.
First of all, the finite element software, COMSOL Multiphysics, was utilized to analyze the optimal operation frequency by calculating the output voltage of fingerprint scanner whether the finger touches the device or not. Results show that there is no relation between the resonance frequency and the optimal operating frequency. The optimal operation frequency may be when the constructive or destructive interference occurs.
Then the effect of protection layer materials was simulated, such as aluminum, polycarbonate (PC) and glass for finding out the suitable material of protect layer. Results show that using PC as the material of protect layer can have better identification performance because of closer acoustic impedance between PC and finger. Finally, the effect of the acrylic thickness was also simulated. Results show that when the acrylic thickness increases, the fingerprint identification ability degrades because of acoustic attenuation of acrylic.
Advisor Committee Ching-Chih Tai - advisor
Yung-Yu Chen - advisor
Jia-Hong Sun - co-chair
Files Date of Defense 2017-01-25 Date of Submission 2017-02-21