The optical fiber winding structure is used to make the fiber optic guided missile (FOG-M). When the FOG-M is released, if the winding structure has extrusion, which will eventually lead to the missile out of control. Based on stress analysis, a theoretical model is established to study the axial strain characteristics of extrusion during the winding process. The axial strain difference between standard and extrusion structure is calculated, showing that the axial strain in extrusion is always greater than standard structure. The axial strain increases with the increasing angle of extrusion. Distributed brillouin optical time domain analysis (BOTDA) technology is used to measure the distributed strain of extrusion at different winding layers. Experimental results show that the extrusion appears during the winding process, and the axial strain at the extrusion increases rapidly with the increasing winding layers. Theoretical calculations agree with the experimental results. This technique provides an important means for the optimization of winding process and the identification of extrusion.
Among many factors contributing to fiber optic gyroscope performance, the quality of the fiber coil is one of the most important parts of it. This paper focuses on the disadvantage of cross-layer leap and sensitivity to outside temperature gradient of the present standard quadrupolar (QAD) fiber coil. The paper focuses on reducing the temperature gradient and improving the winding quality of the fiber coil to modify the original standard QAD winding pattern using methods of buffer layers and layer-by-layer leap. The buffer fiber is wound to the inner and outer sides of the fiber coil to reduce the temperature gradient of effective fiber; the layer-by-layer leap is used in place of the original cross-layer leap, and it may reduce bending and stresses variation when fiber leaping. Also, the fibers are arranged orderly to improve the fiber coil winding quality. In addition to building the mathematical model for fiber coil, the simulation and experiment are performed to verify that the improved QAD fiber coils have better thermal performance, and it helps to reduce thermal-induced drift error of a fiber optic gyroscope and improves its precision.
As a high-precision angular sensor, the interferometric fiber-optic gyroscope (FOG) usually shows high sensitivity to disturbances of the environmental temperature. To research the related influencing factors of influencing the thermal-induced rate error of an FOG is essential to enhance precision and environmental suitability. This paper starts with the factors neglected in past research to derive the thermal-induced error model of a fiber coil including various factors of equivalent radius, asymmetry of fiber tail, cross-layer leap, and so on in detail, and then translates this error into the inner product form of penalty factor matrix and temperature field matrix. Then, the mathematical model and the three-dimensional temperature field model of the fiber coil with the quadrupolar winding pattern is built, which includes the optic core, coating, glue, packing paper, and accurate temperature boundary conditions. The penalty factor matrix and temperature field matrix can be obtained from these models. Finally, the advancement of this revised the thermal-induced rate error model has been verified through simulation and experimental comparison.
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