Minitype F-P reflective index sensor of full optical fiber ring-type reflecting surface structure

A technology of a refractive index sensor and a reflective surface, applied in the field of optical sensing, can solve the problems that the contrast ratio of the Fibonacci cavity is easily affected by the light source, the long-period fiber grating is greatly affected by the bending, and the bare fiber is easily polluted, and achieves high reliability. , small size, simple effect

Inactive Publication Date: 2009-12-30
CHONGQING UNIV
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Problems solved by technology

The refractometer based on long-period fiber grating has high sensitivity, but because the long-period fiber grating is greatly affected by its own bending, its reliability is greatly reduced
The optical fiber gas sensor based on the evanescent wave field can effectively monitor the leakage of gas and liquefied petroleum gas in mines, but the bare optical fiber used in it is easily polluted, which is a difficult p

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  • Minitype F-P reflective index sensor of full optical fiber ring-type reflecting surface structure
  • Minitype F-P reflective index sensor of full optical fiber ring-type reflecting surface structure
  • Minitype F-P reflective index sensor of full optical fiber ring-type reflecting surface structure

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[0020] See figure 1 , Shown in the figure is the sensor structure of the present invention, it is composed of ordinary single-mode fiber 1, large-core hollow-core fiber 2 and the center of the optical fiber 3, ordinary single-mode fiber 1, large-core hollow-core fiber 2. The fiber 3 with a through hole in the center is fusion spliced ​​in sequence, and the core of the large-core hollow fiber 2 and the fiber 3 with a through hole in the center are connected;

[0021] The core (ie, FP cavity) of the large-core hollow-core fiber 2 is closed by the ordinary single-mode fiber 1 and the fiber 3 with a through hole in the center, respectively. The core of the large-core hollow-core fiber 2 (2 in the figure) -1) can only communicate with the external environment through the core of the optical fiber 3 with a through hole in the center (point 3-1 in the figure), and the optical fiber 3 with a through hole in the center should be short enough to make the external fluid (gas, Liquid) can ea...

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Abstract

The invention discloses a minitype F-P reflective index sensor of a full optical fiber ring-type reflecting surface structure, which comprises a general mono-mode optical fiber, a large-core diameter hollow-core optical fiber and an optical fiber with a through hole at the center which are welded and fixed in succession; the large-core diameter hollow-core optical fiber and the optical fiber with the through hole at the center are communicated; the contact surface of the optical fiber with the through hole at the center and the large-core diameter hollow-core optical fiber forms the ring-shaped reflecting surface; the invention has the beneficial technical effects that the invention provides the novel reflective index sensor which is simple to manufacture, small in volume and high in measurement accuracy, and has wide application range and strong capability of resisting disturbance.

Description

technical field [0001] The invention relates to an optical sensing technology, in particular to a miniature F-P refraction index sensor with an all-optical ring reflective surface structure and a manufacturing method thereof. Background technique [0002] Refractive index has important uses in chemical industry, medicine, food, petroleum, coal mine and other industrial sectors. The basic principle is that different substances mixed in different proportions have different refractive indexes. Therefore, in industry, measuring the refractive index of mixtures (mainly liquids and gases) can obtain the concentration of each component, that is, the amount of content. For example, the concentration of sugar in syrup in the sugar industry; the concentration of various reaction substances in the chemical reaction tank, such as some toxic gases, carbon monoxide, sulfur dioxide, etc.; the detection of gas concentration in the coal mine industry, etc. [0003] Typical measurement metho...

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Application Information

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IPC IPC(8): G01N21/41G02B6/255
Inventor 朱涛柯涛饶云江
Owner CHONGQING UNIV
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