Share Email Print

Proceedings Paper

Reflective-tube absorption meter
Author(s): J. Ronald V. Zaneveld; Robert Bartz; James C. Kitchen
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

The design and calibration of a proposed in situ spectral absorption meter is evaluated using a laboratory prototype. The design includes a silver coated (second-surface) glass tube, a tungsten light source (stabilized by means of optical feedback), a monochromator, and a solid state detector. The device measures the absorption coefficient plus a portion of the volume scattering function. Theoretical analyses and laboratory experiments which explore the magnitude and variation of the errors due to scattering and internal reflections are described. Similar analyses are performed on the Cary 1 18 Spectrophotometer to allow cross calibration. Algorithms to yield the abscrption coefficient and the zenith-sun diffuse attenuation coefficient are presented and evaluated. Simultaneous measurement of the beam attenuation or backscattering coefficient allows use of algoriThms with much narrower error bands. The various methods of obtaining absorption and diffuse attenuation values are compared. Procedures for using reverse osmosis filtration to produce a clean water calibration standard are described. An absorption spectrum for pure water is obtained. Development of the absorption meter is proceeding along two lines: 1) a two-wavelength side-by-side LED is being fabricated to allow an in situ chlorophyll a absorption meter to be constructed, and 2) scientific projects using a shipboard or laboratory flow.-through pumping system are being planned.

Paper Details

Date Published: 1 September 1990
PDF: 13 pages
Proc. SPIE 1302, Ocean Optics X, (1 September 1990); doi: 10.1117/12.21439
Show Author Affiliations
J. Ronald V. Zaneveld, Sea Tech, Inc. (United States)
Robert Bartz, Sea Tech, Inc. (United States)
James C. Kitchen, Sea Tech, Inc. (United States)

Published in SPIE Proceedings Vol. 1302:
Ocean Optics X
Richard W. Spinrad, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?