Quantitative determination of large structures by small-angle light scattering

A new small-angle light scattering camera has been developed. In contrast to conventional detection the present system is based on a recently developed two-dimensional charge-coupled-device chip made by Thomson (France). The advantage of this chip is its excellent linear response and very low dark signal even at roam temperature. The best linearity was obtained by leading each pixel signal through the same amplifying system. The optical system covered a diffraction angular region from about 1 degrees to 15 degrees (q = 0.2-2.6 mum(-1)). The camera was calibrated with grids and pin-holes and was tested with polymer latex particles in solution and with spherulites from polymer films.