With the continuous development of the city, the laying of underground pipelines is becoming more and more complicated, especially the underground pipelines laid by trenchless construction technology and the long distance crossing project. In order to save underground space resources, the maintenance and management of pipelines should be strengthened. As a new method of trenchless pipeline measurement, the combination of single chip microcomputer and fiber optic gyroscope is playing an increasingly important role because of its advantages of high positioning accuracy and being free from the surrounding environment and electromagnetic interference.
Fiber optic gyroscope includes optical fiber ring, light source, light detector and signal processing system. Among them, the fiber ring is the key component of the FOG, consisting of a section of fiber arranged in a ring. The light emitted by the light source is divided into two beams by the beam splitter, which propagate through the two directions of the optical fiber ring respectively. When the beam propagation is affected by rotation, the phase difference between the two beams will change, and the phase difference is related to the rotation speed and direction of the optical fiber ring. Finally, the light detector recombines the two beams and detects the phase difference change, obtaining information about the rotation speed and direction through the signal processing system.
The characteristic of underground pipeline is that the bending range is very large, which leads to excessive offset in trenchless drilling, reaming process and pipeline laying, so that the design track of pipeline has a great deviation from the actual track of completion. There is a great error between the design track of underground pipeline and the actual track of completion. It has become an important content of trenchless pipeline laying to strengthen the management and planning of underground pipeline, record the track of laid underground pipeline accurately, and form a database for reference.
As an inertial device for measuring angular rate, 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, and its application prospect is very broad. The theoretical basis of FOG is based on Sagnac effect, which has excellent anti-interference ability, extremely fast reaction rate, and no overload damage in large Angle and long time measurement. It is very suitable for the measurement of underground pipelines. Also in underground engineering maintenance, it can also be used as a positioning tool and rescue tool to find the location of damaged power lines, pipelines and communication optical or electrical cables.
Fiber optic gyroscope can also be applied in the development of subway lines. In the process of implementing the shield tunneling project, the accurate control of settlement is one of the biggest technical difficulties in construction. In order to accurately control the settlement, it is necessary to control the deviation. But how to control the deviation? The conventional measuring method is to use water level connecting pipe, but this method has poor accuracy and can not measure horizontal deviation. During construction, the vertical and horizontal deviation of the pipe shed and the Angle deviation of the pipe shed must be strictly controlled within 1 degree. Therefore, it is the best choice to use high-precision optical fiber gyroscope orientation in the construction of pipe shed, which can effectively control the deviation of pipe shed and finally ensure that pipe shed does not invade the shield tunneling range.
Ericco offers low cost, small size and high performance FOG: ER-FOG-60(https://www.ericcointernational.com/gyroscope/fiber-optic-gyroscope/er-fog60-series.html), which can be used in automatic navigation, positioning and vehicle control of ground vehicles. Attitude control of agricultural aircraft, sowing and spraying pesticides; Locating tools and rescue tools for damaged power lines, pipelines and communication optical or electrical cables during underground project maintenance; It is used for geodetic survey, mineral exploration and production, oil exploration, oil drilling guidance, tunnel construction and other positioning and path survey, and the use of fiber optic gyro rotation Angle and line displacement to achieve dam slope measurement.
Hope this article can let you have a certain understanding of fiber optic gyroscope. If you are interested in fiber optic gyroscopes related products and articles, please read the article below.
https://www.ericcointernational.com/application/application-of-fiber-optic-gyro-in-underground-pipeline.html
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