High-sensitivity measurement of angular velocity based on an optoelectronic oscillator with an intra-loop Sagnac interferometer

Abstract

A novel scheme for angular velocity measurement is proposed and demonstrated by using an optoelectronic oscillator (OEO) incorporating a Sagnac interferometer. In the OEO resonant cavity, the optical carrier (OC) and the first-order sidebands propagate in opposite directions in the Sagnac loop. Thus, the rotation-induced Sagnac phase difference between the OC and first-order sidebands will produce an oscillating frequency shift of the OEO which is proportional to the rotation angular velocity. Then a high-sensitivity angular velocity measurement is realized by monitoring the oscillating microwave frequency. The system is free from the lock-in problem, and the sensitivity scale is measured to be 51.8 kHz/(rad/s) which is equivalent to a minimally detectable angular velocity of 3.98°/h with a frequency shift of 1 Hz.

Efficient sensings of temperature, refractive index, and distance measurement using the cubic-nonlinear optoelectronic oscillators

“…[1][2][3][4] and references therein for a comprehensive review). Recently, the scope of technology and applications has widened to incorporate sensing, measurement, and detection [5][6][7] owing to the fact that typically, an OEO is a high-Q device capable of producing microwave signals with ultralow phase noise and high frequency [8]. Indeed, with OEOs it is possible to carry out the measurement or sensing of length, refractive index, temperature, angular velocity, load, strain, lowpower RF signal, magnetic field, amongst others (see Refs.…”

“…Indeed, with OEOs it is possible to carry out the measurement or sensing of length, refractive index, temperature, angular velocity, load, strain, lowpower RF signal, magnetic field, amongst others (see Refs. [8][9][10][11][12][13][14][15][16] and references therein). For this purpose, several architectures were proposed for the efficiency of the method.…”

Efficient Sensings of Temperature, Refractive Index, and Distance Measurement using the Cubic-Nonlinear Optoelectronic Oscillators

“…[1][2][3][4] and references therein for a comprehensive review). Recently, the scope of technology and applications has widened to incorporate sensing, measurement, and detection [5][6][7] owing to the fact that typically, an OEO is a high-Q device capable of producing microwave signals with ultralow phase noise and high frequency [8]. Indeed, with OEOs it is possible to carry out the measurement or sensing of length, refractive index, temperature, angular velocity, load, strain, lowpower RF signal, magnetic field, amongst others (see Refs.…”

“…Indeed, with OEOs it is possible to carry out the measurement or sensing of length, refractive index, temperature, angular velocity, load, strain, lowpower RF signal, magnetic field, amongst others (see Refs. [8][9][10][11][12][13][14][15][16] and references therein). For this purpose, several architectures were proposed for the efficiency of the method.…”

High-Sensitivity Sensing for Relative Humidity and Temperature Based on an Optoelectronic Oscillator Using a Polyvinyl Alcohol-Fiber Bragg Grating-Fabry Perot Filter

“…Moreover, thanks to the new potentials provided by the MPF for sensing applications, the MPF-based OEO is highly appropriate for sensing since it maps the sensing parameters to the change of the frequency in microwave domain, where the electrical spectrum analyzing and digital signal processing (DSP) techniques can be applied to achieve high-speed and high-resolution interrogation. Various OEO-based sensing and measurement systems have been proposed, including temperature sensor [22], strain sensor [23]- [25], transverse load sensor [26], refractive index sensor [27], [28], vibration sensor [29], angular velocity sensor [30] and magnetic field sensor [31].…”