Scientific

All data on-board the Thetis Profiler is time stamped using the on-board processor clock. This clock provides 10 ms resolution.  The on-board clock is synced to the shore side host controller computer during each surface telemetry session, though the user can...

To first order, the vertical resolution is set by the vertical profiling speed. The profiling speed is user configurable (which can be changed during the deployment). At typical profiling speeds of 20 cm/sec, the Thetis Profiler provides the required 0.25 m vertical...

Derivation of Kd from a In what follows we have left off the dependence on wavelength. In addition we have left off effects due to inelastic scattering.   Modeling Kd(z) requires the inclusion of the depth dependence of the shape of the radiance...

For SBE 4 conductivity calibrations, Sea-Bird uses natural seawater that has been carefully collected, stored, UV irradiated, and filtered. Artificial seawater is not adequate if calibration errors are to be kept below 0.010 psu. Note: SBE 4 is the...

Instrument specific calibrations are more accurate and correspond to the published accuracy specifications. The accuracy of the class based calibration is estimated to be 2.2 uM +/- 20%.

The acquisition of conductivity/salinity data alongside the SeaFETTM is recommended. The acquisition of temperature data is not necessary as the SeaFETTM performs temperature measurements. Typically, conductivity and temperature measurements are combined in...

Sea-Bird Scientific multispectral 500 series radiometers measure light at each fixed wavelength with an interference filter/detector assembly.  The analog output of each detector is amplified and digitized.  The amplification stage and noise filtering is...

Sea-Bird Scientific has developed cosine collectors that are specifically designed to optimize performance in the intended media of operation (air or water). So in water irradiance sensors have cosine collectors that provide an excellent response in water but not in...

The FIRe System measures changes in chlorophyll fluorescence that occur during a short (100 - 400 ?s) but intense (> 20,000 ?mol photons m-2 s-1) flash of light whereas the PAM approach measures the fluorescence induced by a weak modulated light source while using...