A High-Frequency Accelerometer Based on Distributed Bragg Reflector Fiber Laser

Abstract

We propose an optical accelerometer based on distributed Bragg reflector (DBR) fiber laser sensor. The transducer's vibration reduces the birefringence of the preloaded fiber laser and consequently changes the beat frequency of the two orthogonally polarized lasing modes, thus the frequency can be used to retrieve the acceleration information. The DBR probe is a segment of bare erbium fiber, which has a very high natural frequency of vibration. Experimental results show that sensitivity of 4.810 MHz/g with a dynamic range of 0.01g-5g (where g = 9.8 m/s 2 is the gravity of the earth) and natural frequency of ∼1.3 kHz can be obtained with this sensing system.

Condition monitoring of railway track systems by using acceleration signals on wheelset axle-boxes

“…This method detects faults by breaking down the measurement signal into an approximation component of low frequency and a detailed component of high frequency. Huang et al (2013) and Yu et al (2014) presented fibre optic technology for detection of rail corrugation, based on fibre-laser accelerometers. The authors have used a principle of detection of rail corrugation using double integration of axle-box accelerations.…”

Compact dual-frequency fiber laser accelerometer with sub-μg resolution

“…Alternatively, single-longitudinal-mode fiber lasers with the orthogonal polarization output have been exploited as high resolution sensors, by monitoring the beat frequency in the radio frequency (RF) domain [9,10]. In this paper, we demonstrate a high-resolution dual-polarization fiber laser accelerometer.…”

High-resolution, compact dual-frequency fiber laser accelerometer

“…Alternatively, single-longitudinal-mode fiber lasers with orthogonal polarization output have been exploited as highresolution sensors, by monitoring the beat frequency in RF domain [2,3]. The beat frequency is typically hundreds of MHz, determined by the fiber intrinsic birefringence.…”