Integrated Optical Profiler

Fluorometer is a part of an integrated optical profiler, consisting of transmissometer, fluorometer, temperature and pressure probes.

The underwater part consists of independent measuring, microprocessor and A/C converter modules, mounted together in a housing cage.
On-deck unit provides power supply to underwater part and demodulates information signal and converts it to RS232 standard. Unit is mounted on and powered by the standard CAMAC rack. The PC computer connected via the RS232 controls the measuring process, displays and stores acquired data.

Fluorometer

The danish commercial instrument was adapted Q Instrument ApS , (Hundahl and Holck, 1980) by adding new power supply and adaptation of instrument's analog output to A/C converter operating range.

The underwater unit consists of a lamp house and a detector house. The lamp house contains stabilized Zenon discharge lamp, optical filters and lenses and lamp power supply. The detector house contains optical receiver filters, lenses, and PIN photodiode, peak detector, amplifier.


The scheme description

  1. Main cable
  2. Interconnection cable
  3. Depth transducer
  4. Power supply to electronic
  5. Discharge capacitor
  6. Zenon flash lamp
  7. Transmitter filter
  8. Condenser lenses
  9. Measured water volume
  10. Receiver filter
  11. Condenser lenses
  12. PIN photodiode
  13. Pre-amplifier
  14. House element
  15. Peak detector
  16. Sealing device



Technical specification:

light source: Zenon lamp
light detector: PIN diode
excitation filter: broad band BG18 (Schott & Genossen)
detector filter: long wave pass filter RG665 (Schott & Genossen)
potential chlorophyll
concentration sensitivity: 10-10 g/cm3

References 

Hundahl H., Holck J., 1980, The optical instruments developed at the
   Institute of Physical Oceanography University of Copenhagen.
   [in:] Studies in physical oceanography. Kobenhavns Univ., Inst. Fys.
   Oceanogr., rep. no.42, 155-187.