Vibration information obtaining method based on optoelectronic oscillator

Abstract

The invention discloses a vibration information obtaining method based on an optoelectronic oscillator. The method comprises the steps that optical carrier waves generated by a light source in the optoelectronic oscillator are modulated through a single side band to obtain modulated optical signals; vibration information from a vibrator is picked up through an energy storage optical fiber of the optoelectronic oscillator and is loaded to the modulated optical signals to obtain optical signals carrying the vibration information; photovoltaic conversion and vibration are carried out on the optical signals carrying the vibration information to obtain vibration signals; digital demodulation is carried out on the vibration signals after the vibration signals are processed and collected, so that the vibration information is obtained. According to the vibration information obtaining method based on the optoelectronic oscillator, the long energy storage optical fiber of the optoelectronic oscillator serves as a sensing optical fiber, the sensitiveness of a sensor can be improved, the sensor is not affected by light-intensity variation of a laser device, and high-sensitiveness vibration signal measurement can be achieved.

Description

technical field [0001] The invention relates to the field of optical fiber sensing and digital signal processing, in particular to a vibration information acquisition method based on a photoelectric oscillator. Background technique [0002] Optical fiber sensors have the characteristics of strong anti-interference ability and corrosion resistance, and are widely used in the measurement of parameters such as temperature, stress, vibration, and sound field, especially in areas where traditional sensors are incompetent in harsh environments, such as mines, oil wells, large generator sets and Measurements in strong radiation and electromagnetic interference environments such as nuclear power plants. [0003] According to the principle, fiber optic sensors can be divided into two categories: passive sensors and active sensors. Among them, passive sensors can be divided into sensors with optical fiber as sensitive components and sensors with fiber gratings as sensitive components...

AI Technical Summary

Problems solved by technology

Common active optical fiber sensors are based on fiber lasers. This type of sensor uses erbium-doped optical fiber as the sensitive element of the resonant cavity. The multi-longitudinal mode signals in the cavity have mode competition caused by uniform broadening effect, and the signal-to-noise ratio of the beat frequency signal is not high. Higher cost with long resonators

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