High-resolution UV relay lens for particle size distribution measurements using holography

Robert M. Malone; Gene A. Capelle; Brian C. Cox; Brent C. Frogget; Mike Grover; Morris I. Kaufman; Peter Pazuchanics; Danny S. Sorenson; Gerald D. Stevens; Aric Tibbitts; William D. Turley

doi:10.1117/12.793484

29 August 2008 High-resolution UV relay lens for particle size distribution measurements using holography

Robert M. Malone, Gene A. Capelle, Brian C. Cox, Brent C. Frogget, Mike Grover, Morris I. Kaufman, Peter Pazuchanics, Danny S. Sorenson, Gerald D. Stevens, Aric Tibbitts, William D. Turley

Author Affiliations +

Proceedings Volume 7060, Current Developments in Lens Design and Optical Engineering IX; 70600A (2008) https://doi.org/10.1117/12.793484
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

Abstract

Shock waves passing through a metal sample can produce ejecta particulates at a metal-vacuum interface. Holography records particle size distributions by using a high-power, short-pulse laser to freeze particle motion. The sizes of the ejecta particles are recorded using an in-line Fraunhofer holography technique. Because the holographic plate would be destroyed in an energetic environment, a high-resolution lens has been designed to relay the scattered and unscattered light to a safe environment where the interference fringes are recorded on film. These interference fringes allow particles to be reconstructed within a 12-mm-diameter, 5-mm-thick volume. To achieve resolution down to 0.5 μm, both a high-resolution optical relay lens and ultraviolet laser (UV) light were implemented. The design and assembly of a nine-element lens that achieves >2000 lp/mm resolution and operates at f/0.89 will be described. To set up this lens system, a doublet lens is temporarily attached that enables operation with 532-nm laser light and 1100 lp/mm resolution. Thus, the setup and alignment are performed with green light, but the dynamic recording is done with UV light. During setup, the 532-nm beam provides enough focus shift to accommodate the placement of a resolution target outside the ejecta volume; this resolution target does not interfere with the calibrated wires and pegs surrounding the ejecta volume. A television microscope archives images of resolution patterns that prove that the calibration wires, interference filter, holographic plate, and relay lenses are in their correct positions. Part of this lens is under vacuum, at the point where the laser illumination passes through a focus. Alignment and tolerancing of this high-resolution lens will be presented, and resolution variation through the 5-mm depth of field will be discussed.

Citation Download Citation

Robert M. Malone, Gene A. Capelle, Brian C. Cox, Brent C. Frogget, Mike Grover, Morris I. Kaufman, Peter Pazuchanics, Danny S. Sorenson, Gerald D. Stevens, Aric Tibbitts, and William D. Turley "High-resolution UV relay lens for particle size distribution measurements using holography", Proc. SPIE 7060, Current Developments in Lens Design and Optical Engineering IX, 70600A (29 August 2008); https://doi.org/10.1117/12.793484

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