fabry and buisson

Charles Fabry

Fabry’s carriers have devoted themselves to the design of precision optics based on the principle of light interference. The Fabry-Pérot interferometer will be one of the core of modern optics. Charles Fabry also participated in the first measurement of Doppler movement by random thermal motion of atoms to confirm the presence of the ozone layer in the Earth’s atmosphere.

Charles Fabry attended Ecole Polytechnique and the University of Paris and received his PhD in 1889. After a short professorship, he joined the faculty at the University of Marseille in 1894 and moved to the University of Sorbonne in 1920. In 1896, Fabry’s dissertation devised a room in which light rays could interfere with himself multiple times using Alfred Pérot and a partially reflective mirror. As a result of this interference, only very precisely defined wavelengths can pass through the chamber. Known Fabry-Pérot interferometers can be used for very accurate distance measurements and for producing and selecting light with very precisely defined frequencies.

Charles Fabry and Henri Buisson

Throughout his career, Fabry was interested in the application of interferometers, a study of optical interference in basic scientific questions. The kinetic theory of the aircraft, developed by British mathematical physicist James Clerk Maxwell (1831-1879) and Ludwig Boltzman (1844-1906) in Austria in the 19th century, made it possible to predict the number of gas molecules. The speed given at each temperature. Austrian physicist Christian Johann Doppler (1803-1853) explains a little earlier how when emitting a wave, the source motion is reflected by a slight change in the frequency of the emitted wave. Did. By 1912, Fabry and Henri Buisson were able to confirm that the frequency shifts found in helium, neon, and krypton were exactly in line with those predicted by Maxwell-Boltzmann theory.

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Fabry was also interested in astronomy. His brother Louis was an astronomer. He used an interferometer to do some research on the spectrum of stars. While doing this, he realized for the first time the fact that ozone absorbs UV light in his upper atmosphere. Fabry was elected a member of the French Academy of Sciences in 1927, and he received medals from the American Academy of Sciences and the Royal Society of the United Kingdom. He also served as an advisor to the International Committee on Weights and Measures.

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The exact determination of the atomic spectrum was to provide one of the bases for the establishment of quantum theory. The principle of combination developed by Rayleigh Diameter (1842-1919) and Walterlitz (1978-1909) is expressed by a lower frequency set or “term” difference in the visible spectrum of a given atom, respectively. Showed that there is something. The term is finally identified by the energy level of the associated atom. The term hydrogen is particularly simple in morphology and has been able to fit into the simple formula that Danish physicist Niels Bohr (1885-1962) was able to derive in classical physics in 1913. A single electron. Ten years later, complete quantum theory development was needed to explain the spectral terminology of atoms with multiple electrons.

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