title: Automated collimation testing by incorporating the Fourier transform method in Talbot interferometry.
abstract: In this paper, we report an automated technique for collimation testing by incorporating Fourier fringe analysis of the recorded interferograms in Talbot interferometry. The triangular profile of Talbot interferometric fringes has been recorded using a CCD and computer system. The interferograms corresponding to the in-focus, at-focus, and out-of-focus positions of the collimating lens have been recorded. Direct phase measurement using the Fourier transform method has been used for detection of collimation positions. Good accuracy and precision in measurement have been achieved.
authors: Photonics Laboratory, Department of Electronics & Instrumentation Engineering, Institute of Engineering & Technology, Devi Ahilya University, Khandwa Road, Indore 452017, India.
authors: Jitendra
authors: J
authors: Dhanotia
authors: Shashi
authors: S
authors: Prakash