Advances in dynamic metrology using in-line digital holographic interferometry

Vijay Raj Singh; Anand Asundi

doi:10.1117/12.679799

14 August 2006 Advances in dynamic metrology using in-line digital holographic interferometry

Vijay Raj Singh, Anand Asundi

Proceedings Volume 6293, Interferometry XIII: Applications; 629306 (2006) https://doi.org/10.1117/12.679799
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

In this paper a lensless in-line digital holographic microscope is presented as interferometric applications for dynamic measurements. A diverging beam is used to illuminate the object to get the required magnification. In particular, time average in-line digital holographic interferometry is studied for vibration measurements of a smaller membrane. The sensitivities of the numerically reconstructed amplitude and phase information are studied with the distance from object to the CCD, during hologram recording. It is shown that, the increase in object recording distance results the increase in the sensitivity of the Bessel type of fringes representing the vibration amplitude information, while it shows the opposite behaviour for phase information which represent the mean deformation fringes. To explain this phenomenon, the samplings of the interference of object and reference beams, and of the diffracted speckled wavefront from the object are individually studied. A double exposure approach is used for the suppression of noise from real image wave caused by zero-order term and twin image waves because of in-line geometry. The experiment is performed for the study of vibration behaviour of harmonically excited aluminium membranes of 5 mm in size and results are presented.

Citation Download Citation

Vijay Raj Singh and Anand Asundi "Advances in dynamic metrology using in-line digital holographic interferometry", Proc. SPIE 6293, Interferometry XIII: Applications, 629306 (14 August 2006); https://doi.org/10.1117/12.679799

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available