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High-sensitivity micro-nano optical fiber refractive index sensor and preparation method thereof

A technology of refractive index sensor and micro-nano optical fiber, which is applied to the measurement of phase influence characteristics, etc., can solve the problems of fiber structure damage, expensive femtosecond laser, and low sensitivity, and achieve the effect of fast response, light weight, and high sensitivity

Active Publication Date: 2012-04-11
JINAN UNIVERSITY
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  • Application Information

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Problems solved by technology

Another example is the document "Haifeng Xuan, Wei Jin, and Shujing Liu. Long-period gratings in wavelength-scale microfibers. Optics Letters, 2010, 35(1): 85-87." Writing long-period gratings, the measurement sensitivity reaches 1900nm / RIU, the sensitivity is slightly lower and the femtosecond laser is expensive, and the femtosecond laser writing technology has a destructive effect on the fiber structure

Method used

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  • High-sensitivity micro-nano optical fiber refractive index sensor and preparation method thereof
  • High-sensitivity micro-nano optical fiber refractive index sensor and preparation method thereof
  • High-sensitivity micro-nano optical fiber refractive index sensor and preparation method thereof

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Embodiment 1

[0033] Such as figure 1 As shown, a high-sensitivity micro-nano optical fiber refractive index sensor includes a broadband light source 1 sequentially connected along the optical transmission path, a fiber coupler 2 with a splitting ratio of 50%:50%, a birefringent micro-nano optical fiber 3, a first polarization control device 4 and spectrum analyzer 5, wherein fiber coupler 2, birefringent micro-nano fiber 3 and first polarization controller 4 form a fiber optic loop mirror; after the light emitted by broadband light source 1 enters the fiber optic loop mirror through fiber coupler 2, Two light beams propagating in opposite directions are formed, one of which passes through the first polarization controller 4 and the birefringent micro-nano fiber 3 in sequence, and the other passes through the birefringent micro-nano fiber 3 and the first polarization controller 4 in sequence. The beam of light generates a polarization phase difference. By adjusting the first polarization co...

Embodiment 2

[0038] The high-sensitivity micro-nano optical fiber refractive index sensor of the above-mentioned embodiment 1 can be improved as follows, such as Figure 5 Shown is the modified refractive index sensor, with figure 1 The difference is that a second polarization controller 12 and a polarization-maintaining fiber 13 are sequentially connected to one side of the micro-nano fiber through a standard fiber. Adjusting the second polarization controller 12 can adjust the density of the interference spectrum. We adjust the interference spectrum to a sparse state, corresponding to the situation where two birefringent optical fibers cause the polarization phase difference to be subtracted, as shown in equation (3) below, At the same time, the first polarization controller 4 is adjusted to enhance the extinction ratio of the interference spectrum for easy measurement.

[0039] Figure 6 The relationship between the wavelength and the refractive index corresponding to the position of th...

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Abstract

The invention discloses a high-sensitivity micro-nano optical fiber refractive index sensor and a preparation method thereof, and the sensor comprises a broadband light source, an optical fiber loop mirror and a spectrum analyzer, which are sequentially connected along a light transmission path, wherein the optical fiber loop mirror comprises an optical fiber coupler, a birefraction micro-nano optical fiber and a polarization controller, which are connected along the light transmission path; and after light emitted by the broadband light source enters into the optical fiber loop mirror, the formed light spreading in two opposite directions can generate the polarization phase difference by virtue of the birefraction micro-nano optical fiber, the polarization interference is formed after the light passes through the polarization controller, and the light is finally detected and outputted by the spectrum analyzer. The sensor performs sensing by virtue of the birefraction micro-nano optical fiber which has a rectangular or quasi-rectangular dyad symmetric structure; based on the unique birefraction and birefraction scattering effects of the birefraction micro-nano optical fiber, the obtained polarization interference spectrogram can change along with the surrounding refractive index, and the ultra-high sensing sensitivity can be further obtained.

Description

technical field [0001] The invention relates to the technical field of optical fiber refractive index sensors, in particular to a high-sensitivity micro-nano optical fiber refractive index sensor and a preparation method thereof. Background technique [0002] Refractive index sensing is used to detect changes in the refractive index of the external environment. Since the refractive index is a basic property of matter, it is an important parameter in the fields of physics, biology, chemistry and other disciplines. Therefore, the refractive index sensor is very important for environmental monitoring, food Safety, pharmaceutical development, clinical testing and other related fields have important significance and applications. The optical fiber refractive index sensor overcomes the traditional sensor with its advantages of high sensitivity, strong anti-electromagnetic interference ability, fast response speed, anti-biochemical corrosion, small size, light weight, non-toxicity,...

Claims

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Application Information

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IPC IPC(8): G01N21/45
Inventor 李杰关柏鸥金龙孙立朋
Owner JINAN UNIVERSITY
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