НАВИГАЦИОННЫЕ И ГИРОСКОПИЧЕСКИЕ
СИСТЕМЫ
Y. S. Z h a n g, H. G. D i n g
(Department of Precision Instruments Tsinghua University,
Beijing, 100084, P. R. China)
INVESTIGATION OF THE SYSTEM
CONFIGURATION FOR MICRO OPTIC GYROS
The re-entrant system configuration of optic gyro was investigated at
Tsinghua University for developing the micro optic gyro (MOG). In
the system, the bi-directional light beams are circulating in the Sagnac
sensing ring (SSR) for many round trips. The feasibility of the proposed
system was proved by the test results on the fiber analog experimental
setup.
Introduction.
Since 1980, the micro-nano technology has been applied
extensively in the field of micro sensors. One of the outstanding examples
is the micro integrated vibration gyro on silicon substrate (MSG). The
MSG is developed as a micro electro-mechanic system (MEMS) with very
low price.
Obviously, optic gyros are facing the challenge in the market of
navigation products. Since 1983, people tried to use the integrated optic
(IO) ring cavity to replace the mirror system resonator in the conventional
ring laser gyro. Northrop company in USA had developed the first prototype
of micro optic gyro (MOG), in which a passive IO resonator was used.
Unfortunately, the MOG program of Northrop company stopped on the
half way and the first MOG had not been developed as a gyro product.
In 1997, the LETI of CEA in France has developed the solid-state
optic gyro (SSOG), in which the eight-turn optic waveguide coil with the
diameter of 30 mm and the length of 800 mm was used for replacing the
sensing coil in the conventional interferometer fiber optic gyro (IFOG). The
advanced IO technology on silicon substrate (
IOS
2)
insured the quality of
the sensing coil with the optic loss coefficient
<
0
.
025
dB/cm. By using
IOS
2
technology, LETI developed many other devices successfully. But
due to the low accuracy caused by the short sensing coil, the SSOG did
not find application in navigation system.
Since 1995 the authors at Tsinghua University started to investigate
the MOG with IO sensing ring or coil. The goal of the investigation is to
develop the MOG with the performance better than the existing miniature
1
The paper is published without any redaction.
ISSN 0236-3933. Вестник МГТУ им. Н.Э. Баумана. Сер. “Приборостроение”. 2005. № 4 109
