Optical fiber sensing probe for detecting gas and liquid

A technology for optical fiber sensing probes and gas detection, which is applied in optics, light guides, and measuring devices. It can solve the problems of complex system structure, increased instrument volume, difficulty in utilizing the lightness and high integration of optical fiber sensors, and achieves a simple and light structure. , The effect of high signal stability

Inactive Publication Date: 2016-09-28
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the optical fiber side-section coupling technology must be used for the input and output optical signals, and the sample outlet must be connected to a vacuum pump, which not only complicates the syst

Method used

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  • Optical fiber sensing probe for detecting gas and liquid
  • Optical fiber sensing probe for detecting gas and liquid
  • Optical fiber sensing probe for detecting gas and liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0018] Implementation case 1: Gas and liquid optical fiber sensor combined with Y-type optical fiber

[0019] In this example, the special optical fiber constituting the gas and liquid optical fiber sensing probe 5 is described by taking a capillary optical fiber with a micro-hole structure as an example. Capillary fiber structure such as figure 1 As shown, 501 is a capillary fiber air cavity, 502 is a capillary fiber ring core, and 503 is a capillary fiber cladding. The refractive index of the core 502 of the capillary fiber is higher than the refractive index of the cladding 503. Using the principle of total reflection, the capillary fiber can confine the incident light beam within the numerical aperture in the annular core 502 for transmission.

[0020] The manufacturing method of a gas and liquid optical fiber sensing probe in the present invention is as follows figure 2 As shown, one end of the capillary fiber is the light incident end 4, and the other end is formed by chemic...

Embodiment example 2

[0022] Implementation case 2: Gas and liquid optical fiber sensor combined with optical loop device

[0023] In this example, the special optical fiber constituting the gas and liquid optical fiber sensing probe 5 is still used such as figure 2 As shown in the capillary fiber, the manufacturing method of the sensing probe is as described in Case 1, and the side sectional view is as image 3 Shown.

[0024] Figure 5 The application of the present invention is shown. In this example, a gas or liquid optical fiber sensor probe can be combined with the optical loop device 3 to form a gas or liquid optical fiber sensor. Combined with the light source 1, the detector 9 can constitute a gas and liquid optical fiber sensing system. The optical circulator 3 has three branches. The 301 port of the optical circulator is connected to the light source 1, and the 302 port of the optical circulator is coupled to the incident end 4 of the optical fiber sensor probe by welding or fusion taper. Th...

Embodiment example 3

[0025] Implementation case 3: Fiber optic sensor probe with sensitive layer modified on the inner surface of the microchannel

[0026] In this example, the special optical fiber constituting the gas and liquid optical fiber sensing probe 5 is still used such as figure 2 The capillary fiber shown. The manufacturing method of the sensing probe is as follows Image 6 As shown, one end of the capillary fiber is used as the light incident end 4, and the other end is coated with a reflective film 6 as the reflection end. A microhole 7 is opened near the light incident end 4, and the microhole 7 penetrates into the capillary fiber to communicate with the central air hole 501. A specific sensitive layer 10 is modified on the inner surface of the capillary fiber ring core 502. The sensitive layer 10 can be a biological probe, a chemically sensitive layer, a fluorescent indicator, or a quantum dot. The sensitive layer 10 should have the following characteristics: its light transmission ch...

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PUM

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Abstract

The invention discloses an optical fiber sensing probe for detecting gas and liquid and a preparation method of the optical fiber sensing probe. An adopted sensing optical fiber is provided with a micro-hole-channel structure, micro-holes are formed in one end side face of the sensing optical fiber, the other end side face of the sensing optical fiber is plated with a reflecting film, and then the optical fiber sensing probe for detecting the gas and liquid is formed. The optical fiber sensing probe can be combined with a Y-shaped optical fiber, an optical loop detector, an optical coupler and the like to form an optical fiber sensor, and can also be combined with a light source and a detector to form an optical fiber sensing system. The optical fiber sensing probe has the advantages that the integration degree is high, machining is easy, a sample pool is located inside the optical fiber, signal stability is high, and the length of a sensing section is adjustable. The optical fiber sensing probe can be used for detecting the gas and liquid in the various kinds of fields of environment detection, food detection and medical detection.

Description

(1) Technical field [0001] The present invention is an all-optical, highly integrated optical fiber sensing probe, and particularly relates to an optical fiber sensing probe that can be used to detect gas and liquid and a preparation method thereof. (2) Background technology [0002] Optical fiber sensors have many advantages such as anti-electromagnetic interference, high sensitivity, good electrical insulation, safety and reliability, corrosion resistance, miniaturization, etc., and have been widely used in various gas and liquid ions, biomolecules, drugs, various dissolved Detecting sexual gases, etc. [0003] Fiber optic gas sensors or fiber optic liquid sensors can be divided into spectral absorption type, fluorescence type, dye indicator type, refractive index change type and evanescent wave type according to their different sensing principles. Over the years, people have continuously improved the structure of fiber optic gas sensors or fiber optic liquid sensors according t...

Claims

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Application Information

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IPC IPC(8): G01N21/01G01N21/17G01N21/25G01N21/64G01N21/65G02B6/125G02B6/26
CPCG01N21/01G01N21/17G01N21/25G01N21/64G01N21/6486G01N21/65G01N2021/0112G02B6/125G02B6/26
Inventor 朱晓亮
Owner ZHEJIANG GONGSHANG UNIVERSITY
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