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Measuring Mechanical Properties of Thin Optical Coatings

Measuring Mechanical Properties of Thin Optical Coatings. Elaine Rhoades Mentors: Dr. Zanolin, Embry-Riddle Aeronautical University Dr. Gretarsson, Embry-Riddle Aeronautical University April 12, 2014 NASA Space Grant Symposium. Experimental Setup.

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Measuring Mechanical Properties of Thin Optical Coatings

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  1. Measuring Mechanical Properties of Thin Optical Coatings Elaine Rhoades Mentors: Dr. Zanolin, Embry-Riddle Aeronautical University Dr. Gretarsson, Embry-Riddle Aeronautical University April 12, 2014 NASA Space Grant Symposium

  2. Experimental Setup • Use a transducer to emit and sense reflections of a 0.4 GHz, 10 ns acoustic pulse from the surface of a sample. • Materials affect the reflected amplitude differently • Reflected amplitude contains information about the Young’s Modulus Image credit: Dr. Andri Gretarsson, ERAU

  3. Experimental Setup • Water absorption likely has a temperature dependence • Experimental setup has a thermocouple inserted between the piezo and spacers, which allows us to monitor the water’s temperature during data collection Photo credit: Dr. Andri Gretarsson, ERAU

  4. Data Remove noise in the signal by band limiting (cut |FFT|) Exponential form results from water absorption and other losses Image credit: Justin Weber, ERAU

  5. Updates to the acoustics analysis • Automated the data windowing process • Introduced the use of a Tukey window to remove high frequency components • Introduced error propagation

  6. Y Estimate Depends on σ

  7. Nanoindentation

  8. Comparison of Acoustics and Nanoindentation • Colored background is the acoustics chi-squared plot • Bold dashed line is the nanoindentation fit • Solid white lines are the errors in the nanoindentation fit

  9. Samples • Silicon windows • Single-layer tantala coatings, base silica • Silica • Sapphire • Silicon cantilevers (borrowed from Glasgow group) Photo credit: Dr. Andri Gretarsson, ERAU

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