Time average vibration fringe analysis using Hilbert transformation.
Quantitative phase information from a single interferogram can be obtained using the Hilbert transform (HT). We have applied the HT method for quantitative evaluation of Bessel fringes obtained in time average TV holography. The method requires only one fringe pattern for the extraction of vibration amplitude and reduces the complexity in quantifying the data experienced in the time average reference bias modulation method, which uses multiple fringe frames. The technique is demonstrated for the measurement of out-of-plane vibration amplitude on a small scale specimen using a time average microscopic TV holography system.
Applied Optics Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai-600036, India.
Upputuri Paul
UP
Kumar
Nandigana Krishna
NK
Mohan
Mahendra Prasad
MP
Kothiyal