Seawater Density Measurement Technology Based on Oblique Incidence Reflectivity Difference

Abstract Seawater density has an important influence on marine physical environment. The Oblique Incidence Reflectivity Difference (OIRD) method detects seawater’s dielectric constant and other properties by measuring the difference in the two polarization components of reflected light, enabling high-precision real-time measurement of seawater density. Numerical simulations were conducted to study the effects of seawater temperature and depth on dielectric constant and density. Measurements of the dielectric constant of seawater at different temperatures allowed the determination of seawater density under various conditions. Experimental results indicate that this system can achieve high-precision real-time measurements of seawater density, with promising application prospects.