Modulation Transfer Function Of Water

V. A. Del Grosso

doi:10.1117/12.954492

10 November 1975 Modulation Transfer Function Of Water

V. A. Del Grosso

Proceedings Volume 0064, Ocean Optics IV; (1975) https://doi.org/10.1117/12.954492
Event: 19th Annual Technical Symposium, 1975, San Diego, United States

Abstract

Particulate matter of the sizes, concentrations, and refractive indices found in situ renders the Optical Transfer Function of water a real quantity. Modulation Transfer Function (MTF) is measured in vitro by spatial filtering of the projected image of a slit in the Fourier Transform plane. Analysis is by Moire' fringes with a smooth and continuous variation of spatial frequency (nominally 0-40,000 cycles/ radian) obtained by counter-rotating Ronchi rulings. The analogue of convolution of impulse responses is tested as the cascadability in a scattering medium of true sinusoidal MTF's. Coulter Counter techniques are used to measure differential particulate count in 15 channels up to 100 gm. Experimental data for various ranges and particle distributions are compared to theoretical predictions based on volume scattering functions (VSF) obtained by Mie scattering calculations and the Fourier transform conversion relating MTF and VSF first obtained by Willard Wells. The equipment is being repackaged for insitu measurements to accompany forthcoming flood-illuminated SEGAIP (SELF GATED IN-WATER PHOTOGRAPHY) trials.

Citation Download Citation

V. A. Del Grosso "Modulation Transfer Function Of Water", Proc. SPIE 0064, Ocean Optics IV, (10 November 1975); https://doi.org/10.1117/12.954492

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