Line Spread Instrumentation For Propagation Measurements

Wade H. Bailey Jr.

doi:10.1117/12.955870

18 November 1977 Line Spread Instrumentation For Propagation Measurements

Wade H. Bailey Jr.

Proceedings Volume 0125, Advances in Laser Technology for the Atmospheric Sciences; (1977) https://doi.org/10.1117/12.955870
Event: 21st Annual Technical Symposium, 1977, San Diego, United States

Abstract

The Air Force Weapons Laboratory (AFWL) has been involved in the study of laser propagation from airborne platforms. A Line Spread Device (LSD) capable of yielding direct measure of a laser beam's Line Spread Function (LSF) was developed and employed in propagation tests conducted in a wind tunnel by AFWL to examine optimal acoustical suppression techniques for laser cavities exposed to simulated aircraft aerodynamic environments. Measurements were made on various aerodynamic fences and cavity air injection techniques that affect the LSF of a propagating laser. Using the quiescent tunnel as a control, the relative effect of each technique on laser beam quality was determined. The optical instrument employed enabled the comparison of relative beam intensity for each fence or mass injection. It was found that fence height had little effect on beam quality but fence porosity had a marked effect, i.e, 58% porosity alleviated cavity resonance and degraded the beam the least. Mass injection had little effect on the beam LSF. The use of a direct LSF measuring device proved to be a viable means of determining aerodynamic "seeing" qualities of flow fields. It could also be applied to static atmospheric "seeing" measurements through various gases and pollutants.

Citation Download Citation

Wade H. Bailey Jr. "Line Spread Instrumentation For Propagation Measurements", Proc. SPIE 0125, Advances in Laser Technology for the Atmospheric Sciences, (18 November 1977); https://doi.org/10.1117/12.955870

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
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Atmospheric propagation

Calibration

Aerodynamics

Mirrors

Laser beam propagation

Modulation transfer functions

Wind measurement

Show All Keywords

Keywords/Phrases

Search In:

Publication Years