Resolution improvements of the digital light-in-flight recording by holography method

Bengt J.L. Nilsson; Torgny E. Carlsson

doi:10.1117/12.498443

7 March 2006 Resolution improvements of the digital light-in-flight recording by holography method

Proceedings Volume 4101, Laser Interferometry X: Techniques and Analysis; (2006) https://doi.org/10.1117/12.498443
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

An electronic 3D-shape measurement method has been developed by combining light-in-flight recording by holography (lif) with digital holography. Lif is a technique for direct visualization of the propagation of a short light pulse when it is e.g. intersecting a 3D-shaped object resulting in contour lines of the object. This is achieved by letting the reference beam be delayed in comparison to the object beam along a CCD-sensor. A Fourier-Fresnel algorithm numerically reconstructs the hologram. A Littrow mounted reflection grating in a Twyman-Green type interferometer set-up creates the optical delay between the object and the reference beam. The 3D-shape and the position of the object can be determined by combining the contour lines of the object together to a depth map. The recorded hologram from one point will be confined to a rectangular area on the CCD-sensor, where the delay between the reference and the object beam is within the pulse length of the laser. Due to diffraction limitation will the resolution be poor in the direction of the delay since the recorded rectangle area will have its shortest side there. The resolution can however be improved by making two recordings in two perpendicular directions. The two holographic images can then be combined keeping the best resolution of the two holograms. Increase of the resolution makes the lif method useful for more applications for shape and deformation measurements.

Citation Download Citation

Bengt J.L. Nilsson and Torgny E. Carlsson "Resolution improvements of the digital light-in-flight recording by holography method", Proc. SPIE 4101, Laser Interferometry X: Techniques and Analysis, (7 March 2006); https://doi.org/10.1117/12.498443

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
9 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Holograms

Holography

Digital holography

CCD cameras

3D image reconstruction

Image enhancement

Optical resolution

Show All Keywords

Keywords/Phrases

Search In:

Publication Years