C.S. Vikram

Stroboscopic holographic interferometry of vibration simultaneously in two sinusoidal modes

Abstract A stroboscopic technique is suggested to perform the analysis of vibration with two sinusoidal mode combinations. The approach permits analysis of the vibration amplitude due to each mode without disturbance of the amplitude of the other mode.

A triple-exposure technique to reduce recording time in stroboscopic holographic interferometry

Abstract A triple-exposure technique is suggested which reduces the pulsed recording time in stroboscopic holographic interferometry to one half of the required in the corresponding double-exposure method. It has also been found that monitoring of ht ebright reconstructed fringes is easier in the suggested technique.

Further reduction of recording time in stroboscopic holographic interferometry

Abstract Except for the extreme positions, a vibrating object passes twice through a position in each vibration cycle. It is suggested that this fact can be used to reduce the recording time during the pulsed illumination in stroboscopic holographic interferometry by providing two light pulses per vibration cycle for a given subject position.

Time-average holography of objects vibrating sinusoidally and moving with constant acceleration

Abstract The characteristics function of time-average holography is discussed when the object is vibrating sinusoidally and moving with constant acceleration.

Quadruple-exposure holographic interferometry for analysis of superposition of ramp motion and sinusoidal vibration

Abstract A quadruple-exposure holographic interferometric method is suggested for the analysis of motion of an object that is vibrating sinusoidally and moving slowly with constant velocity.

Analysis of nonlinearities in phase holograms by the use of Chebyshev polynomials

Abstract The reconstruction and effect of nonlinearities on it for phase holograms has been studied with the help of Chebyshev polynomials. Noise-to-signal power ratio (NSR), that is the ratio of light power transmitted due to nonlinearities divided by the power to form the image of the original object is determined for phase holograms in terms of coefficients of a Chebyshev series.

Optimization of exposure time in linear hologram recording by pre-exposure or post-exposure

Abstract Using a given intensity of the laser beam, the optimum hologram recording time is discussed when the recording is performed on a pre-exposed or post-exposed medium, retaining the reconstruction efficiency the same as that in the corresponding conventional recording. It is assumed that a variable ratio, lossless beam splitter is used for the beam division process.

Use of phase holograms for phase-difference amplification

Abstract A technique for phase-difference amplification using phase holograms is outlined.

Application of holographic subtraction to the interferometric analysis of fine uniform motions

Abstract The role of holographic subtraction for the interferometric analysis of very small object velocities is described.

Optimization of recording process in laser irradiance modulated time-average holography of sinusoidally vibrating objects

Abstract The beam ratio during modulation of laser irradiance in time-average hologram interferometry of a sinusoidally vibrating object, is discussed for retaining the exposure time, and reducing it if the normal brightness of the higher order J 0 fringes is tolerable. It is assumed that a variable ratio lossless beam splitter is used for the beam division process.