Abstract
Water temperature and salinity are key parameters in many fields such as industry, forestry and agriculture. In this paper, we, theoretically and experimentally, demonstrate a method which is capable of water temperature and salinity measurement based on a laser frequency comb at 518 nm. We have developed a simple Michelson interferometer system. By scanning a mirror on a precision displacement platform, a pair of cross-correlation patterns can be obtained. The real-time optical distance information from these cross-correlation patterns can be used to calculate the optical distance difference changes. Temperature and salinity can be measured via these changes, aided by the empirical formulas. Compared with the reference values, our results show the differences of below 0.12 °C for temperature measurements, and 0.06 ‰ for salinity measurements. The obtained results indicate that our method can offer a powerful scheme for future temperature and salinity measurement.
Highlights
Water temperature and salinity are essential to many aspects, such as industry, agriculture, aquaculture, forestry, potable usage, sailing, entertainment, and scientific research
A new distance value OPD2 will be obtained, which stands for the optical distance between new measurement arm 1 (MA1) and measurement arm 2 (MA2)
Due to the strong dispersion of water, the cross-correlation pattern of MA1 compared with the MA2 is distinctively broadened to about 330 μm (1.1ps)
Summary
Water temperature and salinity are essential to many aspects, such as industry, agriculture, aquaculture, forestry, potable usage, sailing, entertainment, and scientific research. The conductivity meters [9,10] are the most widely used and two electrodes are exploited to detect the water conductivity, related to the concentrations of the dissolved salt. This method can cause water polarization [11]. Based on the principle of light refraction, the refractometer can measure the refractive index of water by recording the beam deviations angle [23,24]. The experimental results show that our method can precisely measure temperature and salinity
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
