Material selection for lightweight optical components in fieldable military optical test set

Darell E. Engelhaupt; Anees Ahmad; George R. Lewis; Gene George

doi:10.1117/12.188651

17 October 1994 Material selection for lightweight optical components in fieldable military optical test set

Darell E. Engelhaupt, Anees Ahmad, George R. Lewis, Gene George

Proceedings Volume 2269, Infrared Technology XX; (1994) https://doi.org/10.1117/12.188651
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

Material selection and suitable low cost manufacturing processes for production of rugged man-portable lightweight optical test set components are described. Field requirements for an ultra lightweight optical test set comprised of an off-axis two mirror collimator plus source and detector optics mandated selection of extremely stable materials. The requirements include temporal, thermal and mechanical performance suitable for portable and transportable military applications. The environmental stability requirement includes operating over a temperature range of 130 degrees fahrenheit. Also military shock and vibration requirements for transportable equipment are imposed on the entire test set. The total weight budget is 5 pounds for the mirrors and the large supporting structure. The structure volume is only about 1% of the occupied space. A near-net fabrication process such as casting or HIP fabrication was required. A comparison of materials and manufacturing methods has resulted in the selection of a hypereutectic aluminum alloy containing 23% by weight silicon with stabilizing elements. This material can be cast and heat treated to produce uniform properties at low cost. The coefficient of thermal expansion (CTE) is much lower than other aluminum alloys and the modulus of elasticity is 50% higher. The alloy was machined with conventional tools and plated with nickel phosphorous of the same CTE to produce stable optics.

Citation Download Citation

Darell E. Engelhaupt, Anees Ahmad, George R. Lewis, and Gene George "Material selection for lightweight optical components in fieldable military optical test set", Proc. SPIE 2269, Infrared Technology XX, (17 October 1994); https://doi.org/10.1117/12.188651

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