Pure water absorption coefficient measurement after eliminating the impact of suspended substance in spectrum from 400 nm to 900 nm
分离悬浮质影响的光学波段(400—900 nm)水吸收系数测量

We designed a new device which can be used to measure the absorption coefficient of pure water directly. First, we measured the irradiance of direct light penetrating through different thicknesses of water layers. Then we used the ratio method to eliminate the impact of measuring instruments on experimental results. Finally, we acquired the extinction coefficient. The extinction coefficient experiment proved that extinction coefficient of suspended substance in water can be calculated by formula of ?ngstrom. We therefore put forward a method on how to eliminate the impact of suspended substance in pure waters. Eventually, we determined the absorption coefficient of pure water from 400 nm to 900 nm. Comparing with previous studies, overall results are consistent, but with better precision in the long wave length. The absorption coefficient of pure water can be used as the normal data for water quality remote sensing.