Remote sensing of natural waters using a multichannel, Lidar-compatible Raman spectrometer and blue excitation

Andrea De Lima Ribeiro*, Helen Pask

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)
8 Downloads (Pure)

Abstract

The design and operation of a custom-built LIDAR-compatible, four-channel Raman spectrometer integrated to a 473 nm pulsed laser is presented. The multichannel design allowed for simultaneous collection of Raman photons at spectral regions identified as highly sensitive to changes in water temperature. Four independent temperature markers were calculated for ultrapure (Milli-Q) and natural water samples [two-color(||), two-color(⊥), depolarisation(A), and depolarisation(B)]. Temperature accuracies of up to ±0.5°C were achieved for both water types when predicted by two-color(||) markers. Multiple linear regression models were constructed considering all simultaneously acquired temperature markers, resulting in improved accuracies of up to ±0.2°C. The potential benefits of blue laser excitation in relation to avoiding overlap between the Raman signal and fluorescence by chlorophyll-a are discussed, along with the higher Raman returns anticipated compared to the more-conventional green laser excitation.

Original languageEnglish
Article number43
Pages (from-to)1-12
Number of pages12
JournalFrontiers in Marine Science
Volume7
DOIs
Publication statusPublished - 14 Feb 2020

Bibliographical note

Copyright © 2020 de Lima Ribeiro and Pask. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • blue excitation
  • LIDAR
  • raman spectroscopy
  • remote sensing
  • water temperature

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