Alfred Perot (3.02.1863-28.02.1925) was a French physicist. He was born in Metz. He studied at the École Polytechnique. In 1884—88 he worked at the University of Nancy under R. Blondlot, where he received the degree of Doctor of Science, in 1888—1901 at the University of Marseilles (professor from 1894), and in 1901 — 08 he was director of a laboratory at the Conservatoire des arts et métiers (Paris). From 1908 he was professor at the École Polytechnique.
His research was in electricity, heat, spectroscopy and optics. He studied the latent heat of vaporisation of water and measured the wavelength of light. In 1894—1901, together with C. Fabry, he developed a new method of optical interferometry and in 1899 constructed the interferometer named after them (the Fabry — Perot interferometer). Using their interferometer as a spectroscopic analyser, they measured with high accuracy the wavelengths of the absorption lines of the solar spectrum, refining the data of H. Rowland. In 1920 — 21 he attempted to test the red-shift effect predicted by A. Einstein in general relativity.