A LIDAR-Compatible, Multichannel Raman Spectrometer for Remote Sensing of Water Temperature

The design and operation of a custom-built LIDAR-compatible, four-channel Raman spectrometer integrated to a 532 nm pulsed laser is presented. The multichannel design allowed for simultaneous collection of Raman photons at two spectral regions identified as highly sensitive to changes in water temperature. For each of these spectral bands, the signals having polarization parallel to (∥) and perpendicular to (⟂), the excitation polarization were collected. Four independent temperature markers were calculated from the Raman signals: two-colour(∥), two-colour(⟂), depolarization(A) and depolarization(B). A total of sixteen datasets were analysed for one ultrapure (Milli-Q) and three samples of natural water. Temperature accuracies of ±0.4 °C–±0.8 °C were achieved using the two-colour(∥) marker. When multiple linear regression models were constructed (linear combination) utilizing all simultaneously acquired temperature markers, improved accuracies of ±0.3 °C–±0.7 °C were achieved.

[1]  Jun Ma,et al.  Remote sensing of subsurface water temperature using Raman lidar , 1992, Photonics West - Lasers and Applications in Science and Engineering.

[2]  J. E. James,et al.  Simulation of Laser-Induced Light Emissions from Water and Extraction of Raman Signal , 1999 .

[3]  G. S. Dwarakish,et al.  Satellite Oceanography– A review☆ , 2015 .

[4]  H. Pask,et al.  Optical remote sensing of water temperature using Raman spectroscopy. , 2015, Optics express.

[5]  Tatiana A. Dolenko,et al.  Valence band of liquid water Raman scattering: some peculiarities and applications in the diagnostics of water media , 2000 .

[6]  D. Risović,et al.  Comparison of Raman spectroscopic methods for the determination of supercooled and liquid water temperature , 2005 .

[7]  D. M. Carey,et al.  Measurement of the Raman Spectrum of Liquid Water , 1996 .

[8]  Donald A. Leonard,et al.  Raman Remote Sensing Of The Ocean Mixed-Layer Depth , 1983 .

[9]  Dahe Liu,et al.  A lidar system based on stimulated Brillouin scattering , 2006 .

[10]  G. Walrafen,et al.  Temperature dependence of the low‐ and high‐frequency Raman scattering from liquid water , 1986 .

[11]  New approach to remote sensing of temperature and salinity in natural water samples. , 2017, Optics express.

[12]  Peter I. Miller,et al.  Evaluating operational AVHRR sea surface temperature data at the coastline using surfers , 2017 .

[13]  Sarah Theiss,et al.  Physical Principles Of Remote Sensing , 2016 .

[14]  H. Pask,et al.  Impact of fluorescence on Raman remote sensing of temperature in natural water samples. , 2019, Optics express.

[15]  K. Cunningham,et al.  Depolarization ratio studies on liquid water , 1973 .

[16]  Donald A. Leonard,et al.  Experimental remote sensing of subsurface temperature in natural ocean water , 1977 .

[17]  Bok-Hyeon Kim,et al.  Ultimate sensing resolution of water temperature by remote Raman spectroscopy. , 2015, Applied optics.

[18]  D. A. Leonard,et al.  Remote sensing of subsurface water temperature by Raman scattering. , 1979, Applied optics.

[19]  W.-H. Yang,et al.  Raman isosbestic points from liquid water , 1986 .

[20]  Yuko Amo,et al.  Dynamical structure of water by Raman spectroscopy , 1998 .

[21]  Christopher J. Smith,et al.  Towards a greater understanding of pattern, scale and process in marine benthic systems: a picture is worth a thousand worms , 2003 .

[22]  A. F. Bunkin,et al.  Quantifying Raman OH-band spectra for remote water temperature measurements. , 2016, Optics letters.