He is best known for his work on the small-angle X-ray scattering method, done in collaboration with his teacher Otto Kratky, and in particular for Porod's law, which describes the asymptote of the scattering intensity I(q) for large scattering wave numbers q. In polymer physics, the worm-like chain model, introduced in a 1949 paper, is sometimes called the Kratky–Porod model.
In 1965 Porod was appointed as professor of experimental physics at the university of Graz. In 1978, he was awarded the Erwin Schrödinger-Preis.
- Lyman G. Parratt, American x-ray physicist with somewhat similar name.