External cavity type fiber laser sensor based on random feedback

Abstract

The invention discloses an external cavity type fiber laser sensor based on random feedback. The external cavity type fiber laser sensor comprises a pump light source, a laser coupled device, a filled-type special optical fiber, an external cavity structure and a frequency spectrum-mode field analysis device, wherein the external cavity structure is composed of a crossed hollow core glass tube, the crossed hollow core glass tube is embedded in the filled-type special optical fiber, and the joint of the hollow core glass tube and the filled-type special optical fiber is adhered and sealed by adopting an optical cement, so as to form a resonant cavity for random fiber lasers; the crossed hollow core glass tube comprises an upper hole and a lower hole, a sample to be tested enters the resonant cavity through the upper hole and flows out from the lower hole; the pump light source is used for generating light waves, and the laser coupled device is used for coupling the light waves in the filled-type special optical fiber to stimulate random lasers; the output light waves of the resonant cavity are coupled to enter the frequency spectrum-mode field analysis device to carry out frequency spectrum and mode field information analysis.

Description

technical field [0001] The invention belongs to the field of optical fiber sensors, in particular to an external cavity optical fiber laser sensor based on random feedback. Background technique [0002] The principle of the fiber optic sensor is to use the light of the light source to be sent into the environment to be measured through the optical fiber, and the optical properties of the light (such as the intensity, wavelength, frequency, phase, polarization state, etc.) of the light change due to factors such as the temperature and humidity of the environment. , by analyzing these changes, the parameters of the environment to be tested are obtained. Due to its strong anti-electromagnetic interference performance, water resistance, high temperature resistance, corrosion resistance and other chemical properties, it has received widespread attention. The optical fiber of the existing optical fiber sensor is exposed to the detection environment, and the detection process is e...

AI Technical Summary

Problems solved by technology

The optical fiber of the existing optical fiber sensor is exposed to the detection environment, and the detection process is easily affected by the external environment

In addition, existing optical fiber sensors are not sensitive to tiny particles, especially those at low concentrations, and cannot detect information such as their concentration and size.

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