Formation of contaminant droplets on surfaces

Kenneth T. Luey; Dianne J. Coleman

doi:10.1117/12.678563

7 September 2006 Formation of contaminant droplets on surfaces

Kenneth T. Luey, Dianne J. Coleman

Proceedings Volume 6291, Optical Systems Degradation, Contamination, and Stray Light: Effects, Measurements, and Control II; 62910G (2006) https://doi.org/10.1117/12.678563
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

The effects of molecular film contamination on optical systems depend strongly on the film uniformity and thickness. Molecular films of uniform thickness are responsible for light transmission losses through absorption. For example, a partially darkened film of dioctyl phthalate 100 Å thick may cause losses of about 2% in the visible spectrum. However, Ternet, et al, Villahermosa, et al, and others, have shown that scattering from droplets or "puddles" can cause transmission losses of 30%. In this paper, we examine properties of the contaminant and surface that drive the formation of smooth films and droplets. It is shown that surfaces play a strong, and sometimes dominant role in controlling film or droplet formation. DC 704, a high purity, siloxane liquid, is shown to assume both droplet and smooth film character depending on the surface.

Citation Download Citation

Kenneth T. Luey and Dianne J. Coleman "Formation of contaminant droplets on surfaces", Proc. SPIE 6291, Optical Systems Degradation, Contamination, and Stray Light: Effects, Measurements, and Control II, 62910G (7 September 2006); https://doi.org/10.1117/12.678563

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