C S Vikram
Articles written in Pramana – Journal of Physics
Volume 8 Issue 5 May 1977 pp 420-426 Optics
A method employing pulsed illumination for the holographic analysis of vibration with space-variant phase is described. Superimposition of two stroboscopically recorded interference patterns to get the amplitude and the phase of vibration at the intersections of fringes is suggested. Contour maps of these two quantities over the entire object surface can then be prepared by interpolation. Detailed solutions are presented for single and double frequency vibrations.
Volume 8 Issue 6 June 1977 pp 541-544 experimental Techniques And Instrumentation
Applications of double exposure holography are described for interferometric analysis of motion which is superposition of three sinusoidal vibrations. The technique requires pre-information of the angular frequencies and the initial phases of the three components. The method is applicable if some conditions regarding the angular frequencies and the phases of the component motions can be met with.
Volume 10 Issue 2 February 1978 pp 221-226 Optics
Two methods have been suggested to detect the direction (forward or backward) of uniform velocity motion along with identification of no motion positions with other intensity maxima positions in the reconstruction. The first method requires two continuous exposures while the other is a combination of one static and one continuous recording.
Volume 12 Issue 4 April 1979 pp 341-346 Optics
It is shown that the fringe shifting technique can increase the sensitivity of speckle photography for sub-speckle size changes. The technique gives time-ordered pattern that can be used for the sign detection of the motion as well.
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