Optical remote sensing of water temperature using Raman spectroscopy

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Physical Chemistry

Background:

• Accurate water temperature measurement is crucial in various scientific and industrial applications.
• Traditional methods may have limitations in certain environments or require direct contact.

Purpose of the Study:

• To investigate the utility of Raman spectroscopy for non-contact water temperature determination.
• To develop and validate methods for temperature measurement using Raman spectral data.
• To design and predict the performance of a specialized Raman spectrometer for this application.

Main Methods:

• Numerical evaluation of the temperature dependence of unpolarized Raman spectra.
• Application of linear regression methods to Raman spectral data for temperature retrieval.
• Design and performance prediction of a two-channel Raman spectrometer.

Main Results:

• Established a clear correlation between Raman spectral features and water temperature.
• Linear regression models accurately predicted temperature from spectral data.
• The designed two-channel Raman spectrometer demonstrated a predicted accuracy of ± 0.5 °C for mains water.

Conclusions:

• Raman spectroscopy is a viable technique for precise water temperature measurement.
• The developed methodology and spectrometer design offer a promising non-contact temperature sensing solution.
• The ± 0.5 °C accuracy highlights the practical applicability of this spectroscopic approach.