Concept
WETLabs ECO-BB2F combined scattering meter and fluorometer
| URI | http://vocab.nerc.ac.uk/collection/L22/current/TOOL1747/1/ | |
|---|---|---|
| Within Vocab | SeaVoX Device Catalogue | |
| Alternative Labels | WETLabs ECO-BB2F | |
| Definition | The Environmental Characterization Optics, or ECO miniature combination scattering meter and fluorometer allows the user to measure backscattering at two wavelengths (470 and 740 nm) at 117 degrees and chlorophyll fluorescence within the same volume. The instrument is used to monitor chlorophyll concentration by directly measuring the amount of chlorophyll-a fluorescence emission from a given sample volume of water. Chlorophyll, when excited by the presence of an external light source, absorbs light in certain regions of the visible spectrum and re-emits a small portion of this light as fluorescence at longer wavelengths. The ECO uses two bright blue LEDs (centred at 455 nm and modulated at 1 kHz) to provide the excitation source. A blue interference filter is used to reject the small amount of red light emitted by the LEDs. The blue light from the sources enters the water volume at an angle of approximately 55-60 degrees with respect to the end face of the unit. Fluoresced light is received by a detector positioned where the acceptance angle forms a 117-degree intersection with the source beam. A red interference filter is used to discriminate against the scattered blue excitation light. The red fluorescence emitted is synchronously detected by a silicon photodiode. The ECO uses three LEDs (modulated at 1 kHz) for source light. The source light enters the water volume and scattered material is detected by a detector positioned where the acceptance angle forms a 117-degree intersection with the source beam. Figure 3 shows the optical configuration for the ECO-BB2F. The instrument has an operational temperature range of 0 - 30 degrees Celsius, and a depth rating of 600 m. | |
| Date | None | |
| Identifier | TOOL1747 | |
| Note | accepted | |
| Is Version Of | TOOL1747 | |
| version | 1 | |
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