The Application Of Digital Speckle Correlation In The Tympanic Membrane Test

Mechanical properties of thin films are important parameters for MEMS technologies, and affect the research and the use of micro structures. Since more than half a century ago, bulge test technology has been widely used in the thin film test. During this thesis, the author improved the traditional bulge test technology with Digital Speckle Correlation Method (DSCM), simplified the experimental conditions, and finished some validation test.Firstly the author started with the literature survey about DSCM and thin film test technology, and knew about the use and development direction of these two methods respectively. Secondly I combined these two methods according to their own characteristics. I made a symbol point in the center of the film, and detected the different locations of the symbol point with DSCM in the flank direction by long space microscope to detect the center delfection (out-of-plain displacement) of the film when loading. It is a easy way to finish the bulge test and simplify the traditional experimental conditions.During the thesis, I designed and finished some validation experiment to prove the useful method in the detection of out-of-plain displacement in the flank direction. Then I completed a brass film bulge test of 0.2mm thickness, including the design and manufacture of the experiment flat and a micro-pressure sensor. Although the final test result is not quite satisfied, the full process has proved the useful of this method in the bulge test of thin film. With higher magnified microscope, it will reach higher test precision. The thesis has statistically analyzed the affections of digital image quality in DSCM searching, and it will be referenced meaning in symbol point making.At last I make some suggestions on the improvement of this bulge test flat based on my research experience.