Gyroscope is the core of inertial navigation system, which is the key factor affecting the performance of inertial navigation system. Especially the fiber optic gyro, its rapid development has created a new situation of inertial navigation system, with pure solid state no moving parts, simple process, wide precision coverage, large dynamic range, fast start, long life and other advantages, fiber optic gyro in many fields have a wide range of applications. If you are looking for a low-cost fiber optic gyroscope with high performance, Ericco offers FOG: ER-FOG-910, which can be used in drone flight control, inertial measurement unit, surveying and mapping, track inertial traverse road test, photoelectric pod and many other fields.
Based on Sagnac effect, fiber optic gyroscope is a new type of fiber optic angular rate sensor. With the development and maturity of fiber optic technology in recent years, FOG has gradually developed into the mainstream instrument in the field of inertia technology, but it also has technical limitations, among which high temperature and mechanical vibration are the main limiting factors that cannot be ignored.
Influence of high temperature on fiber optic gyroscope and its reduction measures
The optical fiber coil mainly consists of polarisation-maintaining optical fiber and potting resin material. The basic manufacturing process of the coil is to first wrap a certain length of optical fiber on a special skeleton according to a specific winding pattern, and then package and cure through curing adhesive, and finally form an all-solid optical fiber ring. Due to the stress distribution and temperature field distribution between the solidified adhesive and the fiber, the long-term stability and temperature drift error of the gyro are directly affected. In 1980, D.M. Shupe first studied the zero drift of FOGs caused by temperature changes, a phenomenon later known as the Shupe effect.
There are two ways to reduce the Shupe effect. On the one hand, the high symmetric multi-pole winding technology is used to improve the reciprocity of the ring and reduce the Shupe error of the fiber ring. On the other hand, the choice of curing adhesive material with matching technology and properties is also the key to suppress the temperature drift of FOG. Thermal conductive curing adhesive is a curing adhesive system containing thermal conductive components. Due to its high thermal conductivity, it has excellent heat transfer and thermal conductivity characteristics. When the ambient temperature changes, the excellent thermal conductivity of the optical fiber ring curing adhesive directly affects the temperature field distribution inside the ring. Increasing the thermal conductivity of the solidified adhesive can make the temperature field distribution of the ring fast and uniform, reduce the temperature gradient and internal stress inside the ring, significantly improve the temperature sensitivity of the ring, and achieve the purpose of suppressing the Shupe error of the FOG and improving the overall accuracy of the fiber optic gyroscope.
Influence of mechanical vibration on fiber optic gyroscope and its reduction measures
Mechanical vibration is one of the unavoidable environmental factors in the application of fiber optic gyroscope. How to keep the high precision of FOG under the condition of mechanical vibration is the content that must be considered in the design and engineering application of FOG. It is assumed that the optical path is reciprocal, that is, in the optical fiber ring, the distance traveled by the light transmitted in the opposite direction is equal, but under normal circumstances, the change of environmental factors (such as mechanical vibration) brings non-reciprocity in the optical fiber ring, which will affect the performance of the FOG, resulting in angular velocity measurement errors.
Based on the theoretical analysis of the mechanism of mechanical vibration affecting the performance of optical fiber gyroscope, the concept of "matching point" is introduced into the optical fiber ring. It is pointed out that the closer the spatial position of "matching point" in the optical fiber ring, the better the vibration performance of the gyro is. The effect of mechanical vibration on the performance of fiber optic gyro is suppressed.
Hope this article can let you have a certain understanding of FOG. If you are interested in fiber optic gyroscopes related products and articles, please read the related products and related articles below.
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