The Seapoint
Chlorophyll Fluorometer (SCF) is a high-performance, low
power instrument for in situ measurements of chlorophyll a.
Its small size, very low power consumption, high
sensitivity, wide dynamic range, 6000 meter depth
capability, and open or pump-through sample volume
options provide the power and flexibility to measure
chlorophyll a in a wide variety of conditions.
The SCF uses modulated blue LED lamps and a blue
excitation filter to excite chlorophyll a. The
fluorescent light emitted by the chlorophyll a
passes through a red emission filter and is detected by a
silicon photodiode. The low level signal is then
processed using synchronous
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demodulation
circuitry which generates an output voltage proportional
to chlorophyll a concentration. The SCF may be
operated with or without a pump. The sensing volume may
be left open to the surrounding water, or, with the use
of the supplied cap, can have water pumped through it.
Two control lines allow the user to set the range to one
of four options. These lines may be hardwired or
microprocessor controlled to provide a suitable range and
resolution for a given application. The sensor is easily
interfaced with data acquisition packages; a 5 ft.
pigtail is supplied. Custom configurations are available. |
