Abstract
An innovative hyperspectral LIDAR instrument has been developed for applications in marine environment monitoring research activities, remotely detecting the fluorescence spectra produced in the spectral interval between 400 nm and 720 nm. The detection system is composed by a custom made photomultiplier charge integrating and measuring (CIM) unit, which makes automatic background signal subtraction, and a liquid crystal tunable filter (LCTF). The new instrument therefore has hyperspectral resolution and allows automatic background subtraction; it is compact and automated by custom software that permit to adapt the instrument properties depending on the environmental conditions. Laboratory tests to characterize the instrument performance have been carried out, concluding that this sensor can be employed in remote sites for Chl-a detection.
Highlights
About 71% of the Earth surface is covered by oceans and their complex ecosystems play a crucial role in climate change, absorbing about 90% of the atmospheric heat and about a quarter of the total carbon dioxide (CO2 ) emitted in the atmosphere by the fossil fuels burning [1]
We describe a fluorosensor light detection and ranging (LIDAR) for marine applications: in this case, considering a typical cruise speed, we can assume that the environmental conditions during a complete cycle of tuning are homogeneous and the use of the liquid crystal tunable filter (LCTF) is fully justified
The study of the phytoplankton and the dissolved organic matter in aquatic environments and, especially, in oceanographic campaigns is of crucial importance to investigate the climate change and its interaction with water bodies, and to monitor water pollutions [1]
Summary
About 71% of the Earth surface is covered by oceans and their complex ecosystems play a crucial role in climate change, absorbing about 90% of the atmospheric heat and about a quarter of the total carbon dioxide (CO2 ) emitted in the atmosphere by the fossil fuels burning [1]. The results of laboratory tests, carried out in order to characterize the CIM unit, the LCTF and the LIDAR fluorosensors, are presented in this work In synthesis, this innovative system represents an improvement of previous configurations being a compact, potentially hyperspectral instrument, less sensitive to misalignments of the optical components. This innovative system represents an improvement of previous configurations being a compact, potentially hyperspectral instrument, less sensitive to misalignments of the optical components It reduces the complexity of the previous LIDAR fluorosensors systems and reduces the background interferences, allowing diurnal continuous measurements of both CDOM and Chl-a concentrations in aquatic environment. Pictures of the 2020, LIDAR instrument main components can be found in Appendix A
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
