The anti-vibration design of fiber optic gyroscope is a typical engineering optimization problem that requires collaborative efforts in mechanical structure, optical path design, and signal processing. The current mainstream solution is to physically isolate vibrations, suppress error sources on the optical path, and filter out residual noise through algorithms, thus forming a complete anti-vibration system.
At the light source and fiber coil level, the design of the fiber coil is optimized by employing quadrupole symmetric winding, low-stress winding techniques, and optimizing adhesive selection and curing processes to enhance the coil's stiffness and resistance to deformation.
At the internal structure design and packaging level, materials with low thermal expansion coefficients and high rigidity (such as ceramics and invar) are used to fabricate the coil skeleton and optical bench, and the mounting methods of optical components (light source, coupler, modulator, detector) are optimized to reduce micro-displacement. Simultaneously, local damping structures (such as rubber pads, silicone filling) or micro-vibration isolators are designed around key sensitive internal components of the gyroscope (such as the fiber coil).
At the signal processing level, active temperature control is used to stabilize the temperature of the light source and key optical components, thereby reducing temperature drift. Closed-loop feedback control is optimized to enhance the stability and anti-interference capability of the control loop. Digital filtering techniques, such as notch filters or adaptive filters designed for specific vibration frequencies, are employed to suppress vibration noise during signal processing. Additionally, through error modeling and compensation, a mathematical model (e.g., polynomial, neural network) relating vibration (acceleration, frequency) to output error is established to enable real-time compensation in the output.
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