The fiber optic gyro is a huge progress following the laser gyro. It belongs to the two-optical gyro. It uses the Sagnac effect and uses the optical path difference to calculate the angular velocity. Compared with the laser gyro, it has a small size, low cost, accuracy of one thousandth, and no moving parts. , High reliability, has been widely used. At present, there are mainly two major factions in China, Beihang University and Zhejiang University. There are more than 30 practitioners. The technology has been opened up, and most of the precision is one-tenth. The industrial chain has shifted to the Midwest and migrant workers can do it. But compared to MEMS, it is still very expensive, and nearly a thousand kilometers of fiber are wound into a stack. Temperature coefficient, reliability, impact resistance, and long-term storage have problems. Moreover, the current accuracy of MEMS is already 10 and equivalent to open-loop fiber. Going to 1, so in some low-end and short-term applications, it is a test of the big nerves of fiber optics practitioners, and the advantages of MEMS small volume weight, low cost, chip batch, high reliability are obvious, but the accuracy of MEMS enters within 10 years 0.1 is a bit difficult, so in the world where 0.1 to one thousandth can be an optical fiber, it cannot be replaced in a short time.
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