Determination of aquatic parameters by a time resolved laser fluorosensor operating from a helicopter
A time resolved Lidar fluorosensor (TRLF) operated from a helicopter is described. This sensor is particularly suitable for: (i) oil identification in a slick on the sea surface; (ii) the performance of accurate measurements on the water beam attenuation coefficient; (iii) the evaluation of the dissolved organic matter (DOM) content in the water column. The procedure to evaluate these parameters is presented and discussed. Two validation campaigns were performed over the Ligurian sea in July and over the Adriatic sea in December 1991. The results conformed with what was expected from the simulation experiments. In particular, the possibility of measuring the water beam extinction coefficient at the excitation wavelength (355 nm) and at the water Raman wavelength (404 nm) from the time dependence of the backscattering and Raman signals of a single shot, was demonstrated. It was therefore possible to draw profiles of the water transparency and of the DOM fluorescence intensity along the flight line. During a flight, a thin (sub micron) oil film was overflown, the time resolved measurement discriminating the oil film signal from that of the DOM contained in the underlying water column. In another flight, a deep surface stratification of no more than 30 centimetres was encountered (Monfalcone harbour) and analysed, separating the total and bulk backscattering returns.
Bibliographic Reference: Paper presented: International Symposium on Environmental Sensing, Berlin (DE), June 22-26, 1992
Availability: Available from (1) as Paper EN 36896 ORA
Record Number: 199210962 / Last updated on: 1994-12-02
Original language: en
Available languages: en