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Line 1: − + − Originally, it was our intention to perform interferometry to analyze the diamond vibration. After several attempts to use the interferometer, it was determined that the vibration amplitude was simply too high to perform interferometry. Instead, a direct imaging technique was used to analyze the diamond vibration. An interesting phenomenon occurred when the direct imaging device was used. The reflected spot entering the camera lens created an artifact known as a lens flare. Typically lens flares are undesirable, but in our case, the lens flare movement directly correlated to the movement of the reflected beam spot on the lens surface. By careful calibration, the pixel movement on the image versus the angular displacement of the diamond surface was determined.
Development of a Direct Imaging Technique for Vibrational Analysis (view source)
Revision as of 03:38, 21 December 2010
, 03:38, 21 December 2010no edit summary
== Abstract ==
== Abstract ==
During the development of the Michelson interferometer, it was determined that the natural resonance amplitude was simply too great to perform interferometry. A direct imaging approach was suggested as a way to determine the vibration amplitude for the very high vibrations at the low wire tension originally used for mounting. This technique involves using the interferometry set up with the reference mirror and beam expander removed. The laser is passed directly through the beam splitter cube, with one half beam illuminating the diamond and the other removed. That illuminated spop is tne passed back through the cube and into our high speed camera. This beam creates two spots on our image. One is the point to point focus spot. The other is an artifact known as a [http://en.wikipedia.org/wiki/Lens_flare lens flare].
During the development of the Michelson interferometer, it was determined that the natural resonance amplitude was simply too great to perform interferometry. A direct imaging approach was suggested as a way to determine the vibration amplitude for the very high vibrations at the low wire tension originally used for mounting. This technique involves using the interferometry set up with the reference mirror and beam expander removed. The laser is passed directly through the beam splitter cube, with one half beam illuminating the diamond and the other removed. That illuminated spop is tne passed back through the cube and into our high speed camera. This beam creates two spots on our image. One is the point to point focus spot. The other is an artifact known as a [http://en.wikipedia.org/wiki/Lens_flare lens flare]. Typically lens flares are undesirable, but in our case, the lens flare movement directly correlated to the angular movement of the reflected beam spot on from lens surface. By careful calibration, the pixel movement on the image versus the angular displacement of the diamond surface was determined.
== Video Analysis ==
== Video Analysis ==
=== Calibration Set-Up ===
=== Calibration Set-Up ===
The following is an image of the device used for the camera calibration:
The following is an image of the device used for the camera calibration: