The transmissometer of classical design (Jerlov, 1976) build at The Institute of Oceanology, PAS, Sopot. Two instruments were in use, both of the same technical parameters, differs by the method of changing filters (remotely controlled rotor / manual change of the filter gear), and by difference in optical base (0.97 / 0.85 m).
Technical details
| Light source/TD> | light bulb 15W Osram |
| Detector | photomultiplier M12-FS-35 Carl Zeiss |
| Source aperture | 0o36' |
| Detector's aperture | 0o27' |
| Beam cross section diameter | 10 mm |
| Length of the optical base | 0.97, 0.85 m |
| Interference filters | 400, 425, 465, 525, 535, 580, 620, 680 nm |
| Half-bandwidth | 4.5 nm |
Ref.:
Jerlov N.G., 1976, Marine optics. Elsevier Sci. Publ. Comp., Amsterdam, Oxford, New York.