Modulated tilted fiber grating refractive index sensing device and method with inner cladding

A technology of tilting fiber grating and sensing device, applied in the direction of polarization influence characteristics, etc., can solve the problems of damage to fiber structure, mechanical strength and stability influence, etc.

Active Publication Date: 2020-10-27
WENZHOU UNIV
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Problems solved by technology

However, this method destroys the fiber structure, and its mechanical strength and stability are affected to a certain extent.

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  • Modulated tilted fiber grating refractive index sensing device and method with inner cladding
  • Modulated tilted fiber grating refractive index sensing device and method with inner cladding
  • Modulated tilted fiber grating refractive index sensing device and method with inner cladding

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] This embodiment discloses a device and method for sensing the refractive index of a modulated tilted fiber grating with an inner cladding, such as figure 1 As shown, it includes: a broadband light source 1, a polarization controller 2, a single-mode fiber jumper 3, a test substance reaction pool 4, a modulated tilted fiber grating 5 with an inner cladding, a filter 6 and a photodetector 7. Such as figure 2As shown, the tilted fiber grating 5 with inner cladding modulation is composed of a tilted fiber grating written with a tilted grating 9 in the core and the cladding near the core region (that is, including inner cladding modulation 8). The modulated tilted fiber grating 5 is placed in the substance 10 to be measured. Among them, r co and r cl are th...

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Abstract

The invention belongs to the field of biochemical medical sensor design of fiber Bragg grating and particularly relates to a refractive index sensing device and a refractive index sensing method of aninner cladding modulated tilted fiber Bragg grating. The resonant strength of the tilted fiber Bragg grating is greatly enhanced by introducing refractive index modulation (namely, inner cladding modulation) in the cladding close to a fiber core area of the tilted fiber Bragg grating, so that the detection sensitivity is greatly improved; the sensing is realized by monitoring the resonant strength of the sensor rather than the change of resonant wavelength along with a to-be-measured material, so that the preparation process of the sensor is simplified and the cost of a detection device is greatly reduced; high sensitivity and high precision refractive index sensing detection from gas in a low refractive index region to liquid in a high refractive index region can be achieved by further regulating the resonant strength of the sensor in different to-be-detected material environments.

Description

technical field [0001] The invention belongs to the field of optical fiber grating biochemical medical sensor design, in particular to a device and method for modulating a tilted optical fiber grating refractive index with an inner cladding. Background technique [0002] Fiber Bragg grating sensor is an important passive photonic device, which has very broad application prospects in biomedical detection, environmental monitoring, and pollutant sensing. In these sensing applications, the basic principle is to monitor the change of the characteristic parameters of the fiber grating (such as resonance wavelength, resonance intensity, polarization loss, etc.) Sensing detection. In the related reports of fiber grating sensing research, tilted fiber grating has become a research hotspot in recent years. Slanted fiber grating is a kind of fiber grating with a certain angle between the grating modulation plane and the fiber axis. [0003] In order to improve the sensing sensitivi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/21
CPCG01N21/21
Inventor 李志红严博腾罗倩倩阮秀凯张耀举戴瑜兴
Owner WENZHOU UNIV
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