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Currently there is considerable interest in the application of
optical meth ods for the measurement of absolute rotation. Active
approaches, so-called ring laser gyros, have been under serious
development for at least 15 years. More recently, passive
approaches using ring resonators or multi turn fiber
interferometers have also demonstrated much pro~ise. The only
previous conference devoted exclusively to optical rotation
sensors, held in 1978 in San Diego, California, was organized by
the Society of Photo-optical Instru mentation Engineers(S.P.I.E.J.
Although the main emphasis at that conference was on ring laser
gyros, a number of papers were also included that described the
early development of fiber gyroscopes. Since then the field of
fiber optic rotation sensors has grown so rapidly that a conference
devoted primarily to this subject was needed. The First
International Conference on Fiber-Optic Rotation Sensors was held
at the Massachusetts Institute of Technology, Cambridge,
Massachusetts, Nove~ ber 9-11, 1981. The purpose of the conference
was to bring together the ~any researchers and interested personnel
from universities, industry, and govern ment to discuss and
exchange ideas on the many recent developments in fiber optic
rotation sensors and related technologies. The program consisted of
tutorial papers as well as invited and contributed papers.
A preliminary investigation is made into a low level accelerometer
incorporating a diamagnetically supported magnet inside a
superconducting tube. Low level control forces are examined and the
magnetic force is found most suitable. Light pressure exerts a
measurable force and is suggested for calibration. The feasibility
of closing a feedback loop around the magnet is demonstrated. The
accelerometer shows much promise for application below 10 (sup -6)g
and the performance results obtained so far are limited only by
displacement detector sensitivity and noisy environment.
"Ezekiel's pointed volume is the best available modern source for grasping the psychological foundations of the Radical Right."—Thomas F Pettigrew, Univ. of Cal., Santa Cruz.
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