External cavity type fiber laser sensor based on random feedback

A fiber laser, random feedback technology, applied in the direction of using optical devices to transmit sensing components, can solve the problems of being easily affected by the external environment, unable to detect concentration, size, etc., to avoid the impact, improve the accuracy, and increase the sensitivity.

Active Publication Date: 2015-04-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Application Information

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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 addi...

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  • External cavity type fiber laser sensor based on random feedback
  • External cavity type fiber laser sensor based on random feedback
  • External cavity type fiber laser sensor based on random feedback

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Embodiment Construction

[0024] A detailed description will be given below of embodiments of the present invention. Although the present invention will be described and illustrated in conjunction with some specific embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, any modification or equivalent replacement made to the present invention shall be included in the scope of the claims of the present invention.

[0025] In addition, in order to better illustrate the present invention, numerous specific details are given in the specific embodiments below. It will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, processes, components and circuits are not described in detail so as to highlight the gist of the present invention.

[0026] Random feedback laser is a random resonant mode formed by multiple scattering of light waves in a disord...

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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...

Claims

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Application Information

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IPC IPC(8): G01D5/26
Inventor 张伟利马瑞李世委朱叶雨饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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