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- Ingenious with apparatus and, as a teacher, preached the importance of experimentation.
- Perot was awarded his doctorate in 1888 for measurements of the specific volumes of saturated vapors, and for determining the mechanical equivalent of heat using a method based on the equations of the civil engineer Clapeyron.
- In the same year, he took a teaching and research post at the University of Marseilles and began to study electricity.
- In 1894, his reputation won him a special chair in industrial electricity, created for him at Marseilles University and a year later he wrote an influential paper, "Les Applications Industrielles d'Electricite".
- Over the next few years he studied dielectric properties and electromagnetic waves, and soon became known in the emerging electrical industry.
- Around this time, Perot began collaborating with fellow-physicist Fabry, to develop a new method of optical interferometry.
- Fabry was trying to measure the distance between metallic surfaces about a micron apart.
- According to Fabry, he and Perot worked well together, Fabry contributing the theoretical work and Perot concentrating on design and construction of the mechanics.
- This work prompted Fabry and Perot to study the very fine fringes produced by reflections between silvered films, which led to the development of the Fabry-Perot interferometer.
- He used interference between rays of light that had undergone different numbers of reflections between the two surfaces to be measured.
- It works by dividing light into a number of beams that travel unequal paths, whose different intensities interfere with each other and appear as a pattern of light and dark bands, known as interference fringes.