Subminiature three-axis fiber-optic gyroscope attitude measurement system

Abstract

The invention relates to a subminiature three-axis fiber-optic gyroscope attitude measurement system. The system comprises a three-axis fiber-optic gyroscope, an attitude and gravity sensor and a frame body for supporting the whole system, the three-axis fiber-optic gyroscope comprises a light source assembly and a detection assembly, and the subminiature three-axis fiber-optic gyroscope attitude measurement system is characterized in that the detection assembly is connected with a control solution storage communication circuit; the subminiature three-axis fiber-optic gyroscope attitude measurement system further comprises a light source control circuit, a power supply control circuit and a three-axis MEMS IMU, the attitude and gravity sensor is connected with the detection assembly, and the light source control circuit, the power supply control circuit and the three-axis MEMS IMU are all connected with the control solution storage communication circuit; the subminiature three-axis fiber-optic gyroscope attitude measurement system is used for azimuth measurement of underground drill holes and is of a cylindrical structure, and all parts of the light source assembly are separately arranged. Compared with the prior art, the three-axis fiber-optic gyroscope attitude measurement system is used for azimuth measurement of underground drill holes, and has the advantages of high measurement precision, low cost, low energy consumption, capability of meeting miniaturization requirements and the like.

Description

technical field [0001] The invention relates to the field of fiber optic gyroscope attitude measurement systems, in particular to an ultra-small three-axis fiber optic gyroscope attitude measurement system. Background technique [0002] With the continuous improvement of unmanned, intelligent and digitized underground drilling requirements, a high-precision, high-reliability, and high-efficiency attitude and heading measurement equipment is urgently needed for the continuous improvement of underground drilling measurement accuracy requirements. At present, there are three main methods of measuring equipment: three-axis magnetic compass plus three-axis accelerometer, mechanical gyroscope plus three-axis accelerometer north-seeking method, and optical fiber gyro plus three-axis accelerometer through indexing north-finding method. [0003] The disadvantages of these three methods are analyzed separately below. [0004] The method of three-axis magnetic compass plus three-axis ...

AI Technical Summary

Problems solved by technology

[0010] 2.1) Poor vibration resistance due to flexible connecting rods and rotating parts;

[0011] 2.2) Long-term precision drift is large;

[0012] 2.3) The peripheral circuit is complex, requiring 16K signal generation circuit, motor servo control circuit, modulation and demodulation circuit, attitude calculation circuit, power conversion circuit

resulting in complex structure and large volume;

[0015] 3.2) The system consisting of one to two fiber optic gyroscope modules and three quartz accelerometers will reduce the heading accuracy when it is greater than 60°, and continuous measurement cannot be performed;

[0016] 3.3) A system consisting of three fiber optic gyroscope modules and three quartz accelerometers contains 3 sets of light sources, 3 sets of Sagnec signal detection servo circuits, and 3 sets of optical path components. At the same time, the quartz accelerometer needs to be provided with a power supply of ±12V or more. Cause high power consumption, high voltage, high explosion-proof requirements

The inner diameter of existing drill pipes is 36 mm, and most of them are measured by magnetic compass. According to the actual response of users, due to the complex underground conditions and the influence of magnetic mine fields, the error will reach 90 meters when the drilling length is 400-500 meters, which cannot meet the requirements. actual requirement

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