Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

A New Approach to Measuring the Temperature of Fluids Reaching 300 ° and 2 mol/kg NaCl Based on the Raman Shift of Water

Not Accessible

Your library or personal account may give you access

Abstract

The OH stretching band of water is very sensitive to temperature and salinity for the existence of hydrogen bonds between H2O molecules. In this study, the OH stretching band was deconvoluted into two Gaussian peaks, with peak 1 at approximately 3450 cm−1 and peak 2 at approximately 3200 cm−1. The positions of peaks 1 and 2 both shifted to higher wavenumbers with increasing temperature from 50 ° to 300 °. The effects of salinity in the range of 0–2 mol/kg NaCl on the OH stretching band were also studied. Linearity for the relationship between Raman shift of peak 1 and temperature increased as the salt concentration increased from 0 to 2 mol/kg, while peak 2 displayed an opposing trend. Two temperature calibration models were developed based on the temperature-dependent changes in the Raman frequency shifts of peaks 1 and 2 (precision of 0.9 ° and 1.0 °, respectively). The calibration models for temperature were successfully applied to determining the temperatures of deep-sea hydrothermal fluids in the Okinawa Trough hydrothermal field. The degree of mixing of hydrothermal fluids and ambient seawater during in situ Raman measurements was estimated by the difference in temperatures determined through these calibration models and those measured through thermocouple sensors.

© 2018 The Author(s)

PDF Article
More Like This
Combined LIBS and Raman spectroscopy: an approach for salinity detection in the field of seawater investigation

Yansheng Fan, Yuanyuan Xue, Yiping Wang, Runze Liu, and Shilei Zhong
Appl. Opt. 61(7) 1718-1725 (2022)

New approach to remote sensing of temperature and salinity in natural water samples

C. P. Artlett and H. M. Pask
Opt. Express 25(3) 2840-2851 (2017)

Ultimate sensing resolution of water temperature by remote Raman spectroscopy

Myoung-Kyu Oh, Hoonsoo Kang, Nan Ei Yu, Bok Hyeon Kim, JoonHeon Kim, JoonSeok Lee, and Gi Woo Hyung
Appl. Opt. 54(10) 2639-2646 (2015)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved