Sushovit Adhikari, Sanichiro Yoshida and Kenji Gomi* Dept of Chemistry and Physics, Southeastern Louisiana University *Present address: Dept. of Mech Eng.

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Presentation transcript:

Sushovit Adhikari, Sanichiro Yoshida and Kenji Gomi* Dept of Chemistry and Physics, Southeastern Louisiana University *Present address: Dept. of Mech Eng. Tokyo Denki University

Outline Existing quality control tests and their shortcomings Preliminary research Instrument design Qualitative and Quantitative analysis of thin film samples

Existing Quality Control Tests Non Destructive Full Field GHz Imaging Technique (expensive and complicated) Scanning Acoustic Spectroscopy [V(z) method] (time consuming) Destructive Nano Scratching Nano indentation (They are not good for 100% inspection)

Preliminary Research Thin film samples were oscillated with an acoustic transducer from the rear A vibrometer was used to measure surface displacement in thin film samples. O 2 treated and untreated thin film samples were measured

Results Reference M. Basnet, S. Yoshida, B. R. Tittmann, A. K. Kalkan, and C. Miyasaka, “Quantitative Nondestructive Evaluation for Adhesive Strength at an Interface of a Thin Film System with Opto-Acoustic Techniques”, 47 th Annual Technical Meeting of Society of Engineering Science, Oct 4-6, Iowa State University, Ames, IA (2010)

Experimental Setup

Qualitative Analysis 11.5 kHz (transducers off) 11.5 kHz (treated transducer on) 11.5 kHz (Untreated transducer on) Fig: Fringe patterns for untreated and treated specimens independently driven at kHz compared with that when both transducers were off

Thin Film Samples (pixel vs intensity) untreated

Fourier Transform of Thin Film Samples untreated

Fourier Transform Peak Level untreated

Conclusions Existing Quality Control Tests are Insufficient An Effective Quality Control Test Should be Nondestructive and Affordable Instrument was assembled to test the adhesive Strength Qualitative Analysis Revealed a Correlation Between Fringe Contrast and Adhesive Strength of the Thin Film Samples. A Method of Quantitatively Analyzing the Fringe Contrast was Developed

Acknowledgements Southeastern Louisiana University STAR grant Dr. Chiaki Miyasaka, Pennsylvania State University Dr. Ik-Keun Park, Seoul National University of Science and Technology