Instruments & Methods
Contact person
Dr. Thomas Badewien
Instruments & Methods
| Instruments | Aim |
| Hyperspectral light profiler | Hyperspectral measurement of the underwater light field |
| Radiometers | Measuring near surface remote sensing reflectance in hyperspectral resolution |
| Optical Nitrate sensors | High frequent measurement of nitrate based on the absorption properties of the water in the UV-spectrum |
| Bio-optical sensor package | In situ determination of the inherent optical properties of the water (attenuation, absorption, (back)scattering) along with fluorescence-based chl-a and CDOM estimations |
| CTD rosette with 24x20-L Niskin bottles | Determination of the vertical hydrographic structure of the water column and providing large volumes of sample water |
| Mid-size ROV Falcon (Saab) | Visual inspection and manipulation of underwater objects |
| Pocket FerryBox | Continuous measurements of oceanographic and biogeochemical variables in the upper water column |
| FlowCam 8400 | Imaging of particles from approx. 2 to 1000 µm |
| ADCP (Acoustic Doppler Current Profiler) | Measurement of underwater currents and acoustic backscatter |
| Radar | Determination of wave field and wave height |
| Surface Drifter | Determination of surface currents based on GPS tracking |
| Secchi-Disc / Forel-Ule-Skala | Estimation of water transparency and –color |
| Laboratory spectrophotometers and -fluorometers | Hyperspectral determination of absorption coefficients on water samples, creation of fluorescence excitation-emission-matrices |
| PSICAM (point-source integrating-cavity absorption meter) | Laboratory determination of hyperspectral absorption coefficients in a water sample |
| BGC-Argo floats | Determination of ocean currents and vertical structure of the water column in terms of hydrographic and biogeochemical variables (including underwater light) in remote regions |
| Flow cytometer and cell sorter | Determination of abundances of virus like particles, microbes and (phyto-) plankton and their distinct scatter characteristics. Size limited:(≤50µm). Sorting of distinct populations from water samples. |
| 3-D printer | We use SLA printers from Formlabs and FDM printers from Bambulab to produce precise prototypes and individual components |
| Drifting sensor chain |
Methods | Aim |
| PARAFAC (Parallel factor analysis) | Evaluation of excitation-emission spectra for the different fluorescing compounds |
| HydroLight | Modeling of underwater light field based on radiative transfer equations |
| ROV-Simulation | Training software for ROV deployments |
| Optical nitrate determination | Refinement of algorithms that relate UV-absorption to nitrate concentration in various water types |
| Lab-based sensor calibration | Various methods to validate and calibrate in situ sensors (e.g. fluorometric chl-a determination, Winkler titration for oxygen concentration, gravimetric suspended matter determination) |