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Fried is a scientist , best known for his contributions to optics. Fried described what has come to be known as Fried's seeing diameter , or r0 usually pronounced r-naught. The seeing diameter is effectively a limiting aperture due to atmospheric turbulence, and is found either empirically or statistically. The seeing diameter limits optical resolution. Note that it is a diameter, not a radius, even though r is used as the variable. Fried was born in Brooklyn, N. He received the A. He also did extensive work in the study of optical propagation in a randomly inhomogeneous atmosphere and the consequent effects on optical system performance.
Fried served for 20 years on the U. In the s, Dr. In addition, his paper, "Limiting Resolution Looking Down Through the Atmosphere," was important in showing a basic limit, about five centimeters, to how sharply space-based telescopes can image objects on the ground. Fried carried out the first analysis evaluating and establishing the feasibility of the use of atmospheric laser back scatter to control adaptive optics—a concept which now goes by the name of laser guide-star.
He then designed, managed the development of the hardware for, and supervised an experiment that successfully demonstrated the validity of the laser guide-star concept. From when he founded the company till when he sold the company , Dr. From to he was a professor of physics at the Naval Postgraduate School, Monterey, California.
Currently, he works as an independent consultant. Fried has done work in a variety of other electro-optics related fields such as the suppression of infrared background clutter in moving target detection systems; analysis of laser speckle statistics; analysis of the effect of photo-detection-event driven shot noise upon the precision of various types of optical measurements; the design and development of low-temperature-optics long-wavelength infrared sensors for use in mid course ballistic missile defense; and in the design and performance analysis for space-based infrared sensors for missile and aircraft detection.
He has also been involved in the search for a sound approach to the mid-course decoy discrimination problem for ballistic missile defense. From Wikipedia, the free encyclopedia. This article includes a list of references , related reading or external links , but its sources remain unclear because it lacks inline citations. Please help to improve this article by introducing more precise citations. June Learn how and when to remove this template message.