Application of FOG in Accurate Monitoring of Subway Shield Construction in China

In smartphones, MEMS gyroscopes can be used for inertial navigation, as well as for photo stabilization. FOG is a more delicate angular velocity sensor than MEMS gyroscope. It is the core component of inertial navigation and can accurately determine the orientation of moving objects. It is a kind of inertial navigation instrument widely used in modern aviation, navigation, aerospace and defense industries.

FOG in innertial navigation system

<The principle and application of fiber optic gyroscope>

The fiber optic gyroscope is a sensitive element based on the optical fiber coil. The light emitted by the laser diode propagates along the optical fiber in two directions. The change of the light propagation path determines the angular displacement of the sensitive element.

As an inertial device for angular rate measurement, fiber optic gyroscope (FOG) has the characteristics of high precision, no moving parts and high reliability. At the same time, its price is relatively low among sensors with the same precision level, so its application prospect is very broad. At present, in the military field, because of the obvious performance advantages of fiber optic gyroscope, has been widely used, basically replaced the traditional mechanical gyroscope. At the same time, UAV, industrial construction and other civil markets have gradually become the new application market of FOG.

<Fiber optic gyroscope subway construction application case>

Recently, the “Endeavour No. 2” shield tunneling machine, which is under construction between Chengdu Metro Line 9 Peifeng Station and Chengdu West Station on the left line, has successfully passed through Metro Line 4 from below and emerged from the tunnel, successfully connecting the two lines. As chengdu subway shield construction ever one of the largest wear under the project risk, the project construction of fiber optic gyroscope monitoring pipe roof, introduced special slurry settlement control technology, innovative deep hollow bolt grouting and grouting technology, precise positioning control domain in the end, will be in the process of the excavation roadbed subsidence control in less than 4 mm. It is the construction with the smallest settlement value in Chengdu metro crossing construction.

The global market for fiber-optic gyroscopes is expected to reach $1.037 billion in 2022, with a CAGR of 3.61% between 2016 and 2022, according to relevant data. In the future, fiber optic gyroscopes will continue to be used in unmanned remote control vehicle navigation and industrial applications to further expand potential application scenarios. At the same time, there will also be increased use of inertial measurement units for navigation systems and navigation and control equipment. In addition, the growth of the robot and unmanned driving market will also provide greater market development opportunities for the growth of the market.

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