Quasi-distributed fiber grating surface plasmon resonance sensor and preparation method

A surface plasmon and resonance sensor technology, used in instruments, scientific instruments, analytical materials, etc., can solve problems such as low sensitivity, complex signal processing system structure, and no mature products and technical reports for quasi-distributed sensors. Environmental Tolerance, Low Energy Dependence Effects

Inactive Publication Date: 2016-01-13
内蒙古盈路科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

Patent 03113077.1 proposes a longitudinally distributed surface plasmon wave sensor. This device requires a reflector at the end of the optical fiber. This method has a complex signal processing system and low sensitivity, which is not conducive to the miniaturization of the sensing probe.
At present, sensors based on fiber Bragg grating or fiber surface plasmon resonance technology are research hotspots in the field of sensing, but quasi-distributed sensors based on fiber Bragg grating and fiber surface plasmon resonance technology have not seen mature products and technical reports

Method used

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  • Quasi-distributed fiber grating surface plasmon resonance sensor and preparation method
  • Quasi-distributed fiber grating surface plasmon resonance sensor and preparation method
  • Quasi-distributed fiber grating surface plasmon resonance sensor and preparation method

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Embodiment 1

[0025] Embodiment 1, a quasi-distributed fiber grating surface plasmon resonance sensor, such as figure 1 , figure 2 As shown, the quasi-distributed fiber grating surface plasmon resonance sensor is prepared through the following steps:

[0026] Step 1: Select a suitable fiber according to the fiber core diameter, refractive index and material;

[0027] Step 2, the cladding 3 covers the outside of the optical fiber core 2;

[0028] Step 3, determine the number, length and shape of the required excitation layers according to the actual application situation, and corrode the cladding 3 with sulfuric acid according to the number, length and shape of the excitation layers to form multiple exposed fiber core surfaces;

[0029] Step 4, evaporating a metal thin film on the surface of each exposed optical fiber core 2 as an excitation layer 4;

[0030] Step 5: Evaporating an optical thin film material on the excitation layer 4 as the modulation layer 6, the excitation layer 4 and ...

Embodiment 2

[0033] Embodiment two, such as image 3 , Figure 4 As shown, the excitation layer is a rectangular quasi-distributed fiber grating surface plasmon resonance sensor, and the preparation steps are the same as in the first embodiment.

[0034] The light source described in this embodiment is an LD light source, using a multimode optical fiber with a core diameter of 600 μm as the excitation matrix, its numerical aperture is 0.37, the length of the optical fiber is 30 km, the distance between fiber gratings is 700 m, and the length of the sensing layer is 86 mm , 95mm, 115mm, etc., the reflection wavelength of the fiber grating is 1310nm, 1315nm, 1326nm, etc., and the reflectance range is 0% to 100%. The present invention takes any reflectance within this range, which can be the same or different.

Embodiment 3

[0035] Embodiment three, such as Figure 5 , Image 6 As shown, the excitation layer is a triangular quasi-distributed fiber grating surface plasmon resonance sensor, and the preparation steps are the same as in the first embodiment.

[0036] The light source described in this embodiment is an ASE broadband light source, using a multimode fiber with a core diameter of 600 μm as the excitation matrix, its numerical aperture is 0.37, the length of the fiber is 100 km, the distance between the fiber gratings is 980 m, and the length of the sensing layer is 126mm, 135mm, 150mm, etc., the fiber grating reflection wavelength is 1550nm, 1559nm, 1570nm, etc., and the reflectivity range is 0% to 100%. The present invention takes any reflectivity within this range, which can be the same or different.

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Abstract

The invention discloses a quasi-distributed fiber grating surface plasma resonance sensor and a making method, belonging to the fiber sensing and fiber communication fields. The sensor is formed by an interface and a sensing element, the sensing element is formed by wrapping an excitation layer outside a fiber core and wrapping a modulation layer outside the excitation layer, the excitation layer and the modulation layer form a sensing layer, and a fiber grating is written into the tail end of each of excitation layers. The problems of complex structure, low sensitivity and adverseness to the micromation of a sensing probe of a signal processing system are solved in the invention. The sensor can timely identify and response various invasive events, has the characteristics of long-distance monitoring, high-precision positioning, low energy dependency, high environmental survivability, electromagnetic interference resistance, corrosion resistance and the like, and can select the distance of the surface plasma resonance sensor according to the size of an area for monitoring.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing and optical fiber communication, in particular to a quasi-distributed optical fiber grating surface plasmon resonance sensor and a preparation method. Background technique [0002] The surface plasmon resonance (SPR) effect is a physical optical phenomenon that occurs at the interface between metal and dielectric, and it is very sensitive to changes in the external environment. Optical fiber surface plasmon resonance sensor is a new type of optical fiber sensing structure that combines optical fiber technology and surface plasmon resonance effect skillfully. When the broadband p-polarized optical signal propagating in the fiber core reaches the sensitive part of the surface plasmon resonance effect, due to the complex dielectric property of the metal itself, it will partially penetrate into the metal to form evanescent waves. When the horizontal direction wave vector Kx of incident light of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/552
Inventor 刘胜春张成平
Owner 内蒙古盈路科技有限公司
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