论文标题
光纤陀螺仪中的热相噪声和相对强度噪声的同时抑制
Simultaneous Suppression of Thermal Phase Noise and Relative Intensity Noise in a Fiber Optic Gyroscope
论文作者
论文摘要
一个公里长的光纤陀螺仪的短期灵敏度主要受热相噪声和相对强度噪声的限制。增加相位调制频率会降低热相噪声，而不是相对强度噪声，因为它的表现为白噪声。在这里，我们提出并在实验上证明，通过在调制频率下抑制相对强度噪声及其三阶谐波，使用直接反馈对超亮发光二极管的驱动电流进行抑制，可以有效地降低角随机行走。我们同时抑制热相噪声和相对强度噪声的角度随机步行$ 15 \，μ\ mathrm {deg}/\ sqrt {\ mathrm {h}} $，偏见的不稳定和$ 33 \，μ\ Mathrm {deg}/\ mathrm { $ 5 \，$ km和一个有效面积为$ 280 \，\ mathrm {m^2} $，用于40小时的测量时间。
The short-term sensitivity of a kilometer-long fiber-optic gyroscope is limited mainly by thermal phase noise and relative intensity noise. Increasing the phase modulation frequency decreases the thermal phase noise but not the relative intensity noise since it behaves as white noise. Here, we propose and experimentally demonstrate that the angular random walk can be effectively decreased by suppressing relative intensity noise at the modulation frequency and its third-order harmonic using direct feedback to the drive current of a superluminescent diode. Our simultaneous suppression of thermal phase noise and relative intensity noise yields an angular random walk of $15\,μ\mathrm{deg}/\sqrt{\mathrm{h}}$ and a bias instability of $33\,μ\mathrm{deg}/\mathrm{h}$ using a fiber coil with a length of $5\,$km and an effective area of $280\,\mathrm{m^2}$ for a measurement time of 40 hours.
