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Micro-water detection system based on distributed feedback fiber laser

A fiber laser and distributed feedback technology, which is applied in the direction of phase influence characteristic measurement, etc., can solve the problems of complex structure and difficult simultaneous detection of multiple points, and achieve the effects of high sensitivity, simple packaging structure design, and large dynamic range

Inactive Publication Date: 2014-09-10
SHANDONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Mi Yunjiao and Wang Xiaoping of Zhejiang University published an article "A Review of Optical Cavity Ring-Down Spectroscopy Technology and Its Application" in the Journal of Optical Instruments in 2007, explaining a kind of ring-down spectroscopy technology for gas detection. This technology uses the e-exponential decay time constant of the light pulse to obtain the gas concentration. Although this technology can achieve a lower detection limit, the structure is complex and it is difficult to achieve multi-point simultaneous detection.

Method used

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  • Micro-water detection system based on distributed feedback fiber laser
  • Micro-water detection system based on distributed feedback fiber laser
  • Micro-water detection system based on distributed feedback fiber laser

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Embodiment 1

[0034] Embodiment 1 of the present invention such as Figure 4 As shown, a micro-water detection system based on distributed feedback fiber laser, including 980nm pump light source (LD) 16, wavelength division multiplexer (WDM) 17, isolator (ISO) 20, distributed feedback fiber laser (DFB- FL) array 19 and demodulation system, it is characterized in that 980nm pump light source 16 is connected with the 980nm input end of wavelength division multiplexer 17 by its pigtail; The common end of wavelength division multiplexer 17 is made of common single mode The optical fiber 18 is connected to the distributed feedback fiber laser array 19; the 1550nm end of the wavelength division multiplexer 17 is connected to the positive input end of the isolator 20 through a single-mode optical fiber, and the other end of the isolator 20 is connected to the demodulation system; the demodulation system Including unbalanced Michelson (Michelson) interferometer 21, dense wavelength division multipl...

Embodiment 2

[0042] A manufacturing and packaging method of a distributed feedback fiber laser (DFB-FL) array, such as Figure 1-3 As shown, the steps are as follows:

[0043] 1) Select a section of rare-earth-doped optical fiber, write a Bragg grating in the rare-earth-doped optical fiber and insert a π phase shift in the process of writing the grating, and the π phase shift is in the middle of the grating;

[0044] 2) A section of 980nm transmission optical fiber is respectively connected to both ends of the rare earth element-doped optical fiber after writing the phase shift grating as a pigtail, and the optical fiber connection method is directly fused by a fusion splicer;

[0045] 3) Select water-absorbing swellable rubber as the internal filling material of the DFB-FL packaging structure, make the water-absorbing swellable rubber into a cylinder shape, pass the distributed feedback fiber laser through the cylinder made of water-swellable rubber and the distributed feedback fiber lase...

Embodiment 3

[0051] The same manufacturing and packaging method as in Embodiment 2 is adopted, except that in Embodiment 3, 16 packaged DFB-FLs with different wavelengths are selected to form a 16-element array. The wavelength intervals of the 16 DFB-FLs are 0.8nm and 2.4nm, and the wavelengths are arranged in the following order: 1532nm, 1532.8nm, 1535.2nm, 1536nm, 1538.4nm, 1539.2nm, 1541.6nm, 1542.4nm, 1544.8nm, 1545.6nm, 1548nm, 1548.8nm, 1551.2nm, 1552nm, 1554.4nm, 1555.2nm.

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Abstract

The invention relates to a micro-water detection system based on a distributed feedback fiber laser, belonging to the technical field of fiber laser sensor detection. The micro-water detection system comprises a 980nm pumping light source, a distributed feedback fiber laser array, an isolator, a demodulating system and the like, and is characterized in that the distributed feedback fiber laser is utilized as a sensing element and water swelling rubber with high water absorption characteristic and a rigid metal material are used for encapsulating the distributed feedback fiber laser; the water swelling rubber is expanded and deformed after absorbing water and extrudes the distributed feedback fiber laser, so that wavelength shifting of the distributed feedback fiber laser is caused; the high-resolution interference type wavelength shifting demodulation and phase carrier modulation and demodulation technology is adopted to accurately obtain the extruding force and the content of micro-water in detected gas. The micro-water detection system can detect the content of micro-water in a remote online manner, all sensing elements in the array can be connected remotely, the detection territorial scope is large and various different gases can be detected simultaneously.

Description

technical field [0001] The invention relates to a micro-water detection system based on a distributed feedback fiber laser (DFB-FL), which belongs to the technical field of fiber laser sensing and gas detection. Background technique [0002] The detection of micro-water content plays a vital role in the fields of power industry, petrochemical industry and medical industry. With the rapid development of the power industry, sulfur hexafluoride (SF6) electrical equipment has been widely used. During operation, SF6 gas will be decomposed into monomeric fluorine, sulfur and fluorine-sulfur compounds after arc discharge or high temperature, and will be combined into stable SF6 gas after the arc disappears. However, when the gas contains moisture, the fluorine-sulfur compound will react with water to generate highly corrosive hydrofluoric acid, sulfuric acid and other highly toxic chemical substances, which will corrode electrical equipment, reduce the insulation capacity of equip...

Claims

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Application Information

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IPC IPC(8): G01N21/41G01N21/45
Inventor 王朋朋常军朱存光常恒泰王宗良刘永宁
Owner SHANDONG UNIV
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