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Roger Lhermitte

Roger M. Lhermitte was a French meteorologist who "pioneered the development of meteorological Doppler radar." His career extended from the 1950s until his death where he made numerous contributions to the field of radar meteorology resulting in over 100 publications and numerous patents.

Early life and education
Roger Lhermitte was born in Ergal, a hamlet of Jouars-Pontchartrain in the Yvelines, France, on 28 May 1920. During the occupation of Germany in France in World War II, he was compulsorily enlisted by the Germans to work for Siemens in Berlin. "While in Berlin, he made numerous trips to bomb shelters for safety, an experience he likened many times to Kurt Vonnegut’s descriptions of Dresden in Slaughterhouse Five. Kurt’s brother, Bernard Vonnegut, was later to become one of Roger’s closest colleagues in atmospheric electricity". After the end of the war, Lhermitte continued his education to pursue his doctoral thesis at the Faculté des Sciences de L’Université de Paris under the guidance of Professor Pauthenier. The subject of his thesis work was titled "Contribution à L'Étude des Précipitations Par L’analyse des Échos de Pluies Obtenus à L’aide de Radars" which, roughly translated to English was "Contributions to the study of Precipitations via the Analysis of Radar Data." The thesis begins with the sentence "La presence des gouttes de pluie d'une precipitation provoque la diffusion des ondes centrimetriques et par suite l'apparition d'echos sur les indicateurs des radars utilisant ces longueurs d'onde", which roughly translates to "The presence of precipitation provokes the scattering of centimeter wavelength radiation, which is followed by the appearance of echos on radars using this same wavelength." This is the beginning of decades long research in atmospheric science that led to over 100 publications and numerous patents. == Career ==
Career
Lhermitte began his career as a scientist at "la Météorologie nationale," first in the city of Trappes, France, and later on Magny-les-Hameaux. Lhermitte first went to North America as a visitor to the Stormy Weather Group in Montreal, QC. He left Paris on January 2, 1955, arriving the next day. In 1964 Edwin Kessler had just become director of National Severe Storms Laboratory (NSSL) and was coordinating efforts to build a weather radar program. He had maintained contact with Roger, and reached out to him to join this new program. Lhermitte left the Sperry Rand Research center in early 1964 for this new venture to work with Kessler, K. Wilk, Dale Sirmans and others. The weather radar was built in 1987. Its design and implementation is described in Lhermitte's 1987 paper "A 94-GHz Doppler Radar for Cloud Observations". This was later explored by Pavlos Kollias et al. in a paper entitled "Why Mie?": == Retirement ==
Retirement
Lhermitte retired as professor emeritus in the early nineties. Near the end of his career, he decided to write a book on his experiences with centimeter and millimeter wavelength radars in meteorology. It was not written to be a comprehensive review of radars in meteorology, but rather his perspective on it. It contains many original ideas developed by him. Lhermitte died on November 21, 2016, in Miami, Florida. == Contributions to the field of radar meteorology ==
Contributions to the field of radar meteorology
From an article on the 30th Conference on Radar Meteorology, Roger Lhermitte's contributions as listed {{Blockquote|text= • pioneered the development of weather radar; • designed and built the first pulse-pair processor that revolutionized Doppler weather radar research; • shared his pulse-pair processor design with NCAR, which made the technology available for the broad community to use; • developed unique pulsed Doppler sonar for ocean current measurements; • pioneered the development and demonstrated these of 3-mm radar for cloud studies (such radar will now be deployed from satellite); and • pioneered multiple-Doppler radar measurements of three-dimensional kinematic fields. 30th Conference on Radar Meteorology (A Tribute to Roger Lhermitte) The 30th Conference on Radar Meteorology was held in tribute for Lhermitte, who was 82 at the time. An article in BAMS (2002) describes the tribute: == Publications ==
Publications
Patents • Atmospheric motion non-coherent pulse doppler system (July 6, 1965) • Method and means of determining variability of atmospheric motion with respect to altitude (July 27, 1965) • Atmospheric Motion Coherent Pulse Doppler Radar System (October 12, 1965) • Radar tornado alarm (September 6, 1966) • Waveform Averaging and Contouring Device For Weather Radars And The Like (January 30, 1968) Selected publications • • Lhermitte, R. (1959), La representation directe du spectre de fluctuation des echos radars donnes par des precipitations, 248, 1554-1556 • Lhermitte, R. (1958), Sur la fluctuation des echos de precipitations, C. R. Acad. Sci., 246, 1245-1248 • Lhermitte, R., and R. Serafin (1984) "Pulse-to-pulse coherent Doppler sonar signal processing techniques," J. Atmos. and Ocean. Technol., vol. 1, pp 293–308 • Lhermitte, R. (1987) "A 94 GHz Doppler Radar for Cloud Observations." J. Atmos. Ocean . Tech., 4 (1), 36‐48 == References ==
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