MEASUREMENT OF TURBIDITY WITH POLARIZED-LIGHT

The results of an investigation into the use of polarized light for tu rbidity measurement are presented in this paper. Preliminary experimen ts were carried out using an ophthalmic slit lamp. Following this, a w ider range of turbidity measurements were made using an optical bench- mounted ellipsometer employing a laser diode source. Results have show n that for Rayleigh particles, in addition to changes in scattering an gle, different polarization states can be used to obtain a wide range, linear turbidity response. For Mie particles the dependence on polari zation state is much less marked.