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A new Photonic crystal fiber structure with five air-holes in the first ring is proposed. This new PCF possess the advantages of fabrication and welding. The effective index, modal field profile and the dispersion (D) characteristics are analyzed by employing the finite element method. It is found that, by adjusting the fabrication parameters, the quinquangular photonic crystal fiber can achieve similar...
Brillouin fiber optic gyroscope has the advantages of simple structure, solid stability, high sensitivity and resolution, high dynamic range and so on, it can be used in plenty of inertial sensor systems. In this paper, frequency stabilization problem of Brillouin fiber-optic gyroscope is researched and analyzed, then a new frequency stabilization technique is proposed, experimental results showed...
In order to further improve the measure precision of FOG north-seeker, a new north determining scheme according to the traditional two-position north determining scheme was proposed. First, analyze the principle of FOG north-seeker and the main errors that effect the north determining precision, emphasize the influences caused by the position error and floor lopsided error , and discuss the models...
The optical structure and working principle of brillouin fiber optic gyroscope was analyzed, the optical components Jones matrix model of brillouin fiber optic gyroscope was established by using Jones matrix optics theory, and the optical transfer matrix model was established based on optical transmission mechanism, the output light intensity expressions of brillouin fiber optic gyroscope and the...
Traditional digital close-loop fiber optic gyro (FOG) takes plusmnpi/2 square wave modulation for signal processing, in which way the circuit will generate additional cross-coupling error, thus affecting the accuracy of the system. In this paper a new modulating scheme for FOG is taken, in which the determinate five points of the light intensity detection curve are modulated. Theoretical and experimental...
This paper introduces a hybrid optical structure of interferometric fiber-optic gyroscope (IFOG). The IFOG is characterized by using single-mode optical fiber coupler and low-polarized light source. Through the theoretical analysis on the specialty of polarization, it makes the conclusion that the hybrid optical structure IFOG has a correspondingly lower phasic error. The testing results confirm that...
When the system mathematical model and the noise statistical properties are not very accurate, the Kalman filtering will reduce the precision of filtering, and even lead to filter divergence.In view of this, adaptive filtering which based on the principle of Kalman filtering is proposed. By comparison experiment, it can be obtained that the adaptive filtering can achieve better filtering effect than...
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