High-Temperature Fiber-Optic Vibration Sensor Based on an Atomic Frequency Standard

As a vibration signal acquisition device, the vibration sensor has important application prospects in aerospace, industrial manufacturing, and other fields. The traditional electrical vibration sensor is limited by its material and sensitive mechanism and has some bottleneck problems, such as poor anti-electromagnetic interference ability, poor temperature resistance, and inability to self-calibrate. Here, we report a high-temperature self-calibration fiber-optic vibration sensor based on an atomic frequency standard system for the first time. The absolute stability of the transition frequency between atomic states ensures the accuracy and effectiveness of the acceleration measurement under extreme conditions. The sensor is based on the Fabry–Pérot interference principle utilizing a sapphire material for the sensitive structure and enclosed in a high-reliability and rigid stainless-steel package for protection. The experimental results show that it operates at temperatures up to 600 °C with a sensitivity of 38.66 nm/g and a characteristic frequency of 2446 Hz. This work provides a new approach to improve the accuracy of fiber-optic sensing under harsh, on-site testing conditions.