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In order to suppress the relative intensity noise (RIN) of broadband light source-based resonant fiber optic gyroscope (RFOG) and improve the accuracy of RFOG. The structure of the fiber optic resonant cavity sensitive element is analyzed and optimized. First, a simulation model is established based on the multi-loop interference superposition theory to explore the transmission characteristics of the broadband RFOG under different sensitive element structures. Next, based on the RFOG optical field theoretical model, the impact of coupler position on the accuracy of the gyroscope and the magnitude of the RIN is analyzed. Experimental results show that the asymmetric resonator with the fiber loop at the coupler's cross port achieves superior accuracy. And this structure suppresses relative intensity noise. By optimizing the sensitive element structure and using a fiber resonator with a diameter of 10 cm and a length of 220 meters, the angle random walk reached and the bias instability reached 0.002 (°)/h. In addition, a single-axis gyroscope prototype is built using a fiber loop with a diameter of 5 cm and a length of 300 meters. The prototype has a volume of 170 cm3. the angle random walk reached
and the bias instability reached 0.02(°)/h.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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