| BML Offshore Mooring: Seawater Fluorescence
Instrument Type: WETLabs ECO FL Fluorometer
Description: The Environmental Characterization Optics or ECO miniature fluorometer allows the user to measure relative chlorophyll concentrations by directly measuring the amount of fluorescence emission in a sample volume of water. The ECO uses an LED to provide the excitation source. An interference filter is used to reject the small amount of out-of-band light emitted by the LED. The light from the source enters the water volume at an angle of approximately 55 – 60° with respect to the end face of the unit. Fluoresced light is received by a detector positioned where the acceptance angle forms a 140° intersection with the source beam. An interference filter is used to discriminate against the scattered excitation light.
Location: Suspended from a chain off the BML oceanographic mooring, ~1.2 km off Bodega Head.
Latitude 38° 18' 42.2" N
Longitude 123° 04' 57.4" W
Installed: Deployed intermittently
Specifications:
Excitation Wavelength: 470 nm
Emission Wavelength: 695 nm
Sensitivity: 0.01 µg/l
Linearity: 99% R2
Range: 0.01 – 125 µg/l
Acquisition Settings:
Sample interval: 300 seconds
Measurements per Sample: 25
Biowiper opens for sample
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