Project Title:

A Spectrometer for In Situ Ocean Optical Measurements

08.16-9621
910117
A Spectrometer for In Situ Ocean Optical Measurements
American Holographic, Inc.
P.O. Box 1310
Littleton
MA
01460
J. Thomas
Brownrigg
508-486-9621
GSFC
NAS5-31932
163

08.16-9621
910117

Abstract:

A Spectrometer for In Situ Ocean Optical Measurements
Accurate measurements of upwelling radiance from marine waters are needed to calibrate
air- or satellite-borne sensors used to measure ocean optical properties. Submersible
monochromator or filter instruments built for this purpose have several drawbacks:
loss of accuracy due to mechanical wear, slow data acquisition rates, and inability
to monitor several sources simultaneously. An instrument will be developed that incorporates
a spectrometer with a two-dimensional, CCD array detector and permits simultaneous
measurement of several sources that use optical fibers. Chlorophyll concentrations
will be estimated from laser-excited chlorophyll fluorescence. The entire system,
including data processing and telemetry, will be housed in an enclosure deployable
from ship or buoy.
This instrument would be applicable to process monitoring: on-line measurement of
color, moisture, and polymer composition (visible and near-infrared); alloy composition
and plasma process monitoring by element analysis; and medical diagnostics, including
use of fiber-optic sensors.
ocean, marine, spectrometer, spectroradiometer, fluorometer, optical properties,
color