Instrument: Sea Tech Fluorometer

Dataset: 
CTD
Instrument: 
Sea Tech Fluorometer
Instrument Short Name: Sea Tech Fluorometer
Community Standard Description
(http://vocab.nerc.ac.uk/collection/L05/current/113/)
Instrument Description:

The Sea Tech chlorophyll-a fluorometer has internally selectable settings to adjust for different ranges of chlorophyll concentration, and is designed to measure chlorophyll-a fluorescence in situ. The instrument is stable with time and temperature and uses specially selected optical filters enabling accurate measurements of chlorophyll a. It can be deployed in moored or profiling mode. This instrument designation is used when specific make and model are not known. The Sea Tech Fluorometer was manufactured by Sea Tech, Inc. (Corvalis, OR, USA).

PI supplied instrument name: SeaTech Fluorometer
Dataset-specific description

Chlorophyll-a fluorescence distribution in the Arabian Sea was
determined, in-situ, with a SeaTech Fluorometer. The fluorometer was
interfaced with the Sea-Bird CTD, and the data were acquired in the
same format as the transmissometer data. The Fluorometer is a standard
irradiation/emission system. When chlorophyll a is excited by blue
light (425 nm), it will fluoresce at a peak wavelength of 685 nm (red
light). The emission detector is filtered to a peak response in order
to make the measurement insensitive to the excitation source. The
amount of fluoresced light detected is converted to a voltage range of
0 to 5 volts. A signal gain of 10x was used, setting sensitivity to
3mg chl-a m^-3. The fluorometer is set to sample with a three second time
constant to smooth the data. A baffle has been placed in front of the
emission detector in an attempt to make it insensitive to ambient light(SeaTech Fluorometer Manual).