Integration of an Emerging Highly Sensitive Optical CO2 Sensor for Ocean Monitoring on an Existing Data Acquisition System SeaKeeper 1000 (trademark)

The novelly designed optical sensor for autonomous ocean monitoring works on equilibrium principles. When the pH-sensitive reagent solution sitting behind a gas-permeable membrane is exposed to seawater, the CO2 molecules present in the seawater diffuse across the membrane into the reagent and induc...

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Bibliographic Details
Main Author: Rao, Govind
Other Authors: MARYLAND UNIV BALTIMORE COUNTY BALTIMORE MD DEPT OF CHEMICAL AND BIOCHEMICAL ENGINEERING
Format: Text
Language:English
Published: 2012
Subjects:
Physical and Dynamic Oceanography
Optics
*OPTICAL DETECTORS
BASES(CHEMISTRY)
CALIBRATION
CARBON DIOXIDE
DATA ACQUISITION
DYES
EMISSION
FLOW
FLUORESCENCE
LIGHT EMITTING DIODES
LIGHT SCATTERING
LOW COSTS
MASS
MONITORING
PROTOTYPES
PUMPS
OCEAN MONITORING
SEAKEEPER 1000TM DATA ACQUISITION SYSTEM
OCEAN ACIDIFICATION
FLOW CELLS
MASS EXCHANGERS
Ocean acidification
Online Access:http://www.dtic.mil/docs/citations/ADA571554
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA571554
Description
Summary:The novelly designed optical sensor for autonomous ocean monitoring works on equilibrium principles. When the pH-sensitive reagent solution sitting behind a gas-permeable membrane is exposed to seawater, the CO2 molecules present in the seawater diffuse across the membrane into the reagent and induce a pH change. After equilibrium is reached, the fluorescence is measured and the pCO2 data are recovered from a calibration curve. A specific feature of our measurement technique is the use of excitation ratiometric approach. A violet LED (Light Emitting Diode) and a blue LED are used to excite the sensing reagent through an excitation filter and the pCO2 dependent emission is measured through an emission filter by a photodiode.

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