Novel micro-nano high birefraction Sagnac optical fiber biological sensor

A high-birefringence optical fiber and biosensor technology, which is applied in instruments, scientific instruments, and material analysis through optical means, can solve the problems of different propagation coefficients and changes in the polarization state of output light, and achieve improved sensitivity, good stability, and The effect of low sensitivity

Pending Publication Date: 2019-02-15
NORTHEASTERN UNIV
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  • Abstract
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Problems solved by technology

But in fact, the propagation coefficients of the mutually perpendicular polarization modes are different due to the birefringence of the fiber, resulting in a change in the polarization state of the output light

Method used

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  • Novel micro-nano high birefraction Sagnac optical fiber biological sensor

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Embodiment 1

[0039] Such as figure 1 As shown, the new micro-nano high birefringence Sagnac fiber biosensor includes two cascaded Sagnac interference rings, the first interference ring I is a filter ring, and the second interference ring II is a sensor ring, where:

[0040] The first interference ring I is a filter ring composed of a first 3dB coupler 1, a first polarization controller 2, and a Panda polarization-maintaining fiber 3, and a first 3dB coupler 1 is arranged at the inlet and outlet ports of the filter ring, The first 3dB coupler 1, the Panda polarization-maintaining fiber 3 and the first polarization controller 2 are connected through a single-mode fiber; the length of the Panda polarization-maintaining fiber in the filter ring is 10cm-30cm.

[0041] The second interference ring II is a sensor ring composed of a second 3dB coupler 4, a second polarization controller 5, and a micro-nano high-birefringence fiber 6, and a second 3dB coupler 4 is arranged at the entrance and exit ...

Embodiment 2

[0048] The experiment of measuring bovine serum albumin solution with the above-mentioned novel micro-nano high birefringence Sagnac fiber optic biosensor is as follows:

[0049] Such as figure 1 As shown in the figure, connect the inlet end of the first interference ring I of the new micro-nano high birefringence Sagnac fiber biosensor to the light source, and connect the outlet end of the second interference ring II to the spectrometer;

[0050] Prepare bovine serum albumin solutions with concentrations of 0.5mg / mL, 1.0mg / mL, 1.5mg / mL and 2.0mg / mL respectively;

[0051] Note that the second interference ring II of the new micro-nano high birefringence Sagnac fiber biosensor is coated with a graphene oxide film layer on the micro-nano high birefringence optical fiber 6, after adding the bovine serum albumin solution dropwise, use The micro-nano high-birefringence optical fiber 6 is cleaned with ionic water to ensure that there is no residual protein solution on the surface o...

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Abstract

The invention relates to a novel micro-nano high birefraction Sagnac optical fiber biological sensor. The biological sensor is researched and developed through novel micro-nano high birefraction Sagnac optical fibers, and comprises two cascade Sagnac interference rings, one Sagnac interference ring adopts a filter ring compriseing panda polarization-maintaining fiber as a filter, and the other Sagnac interference ring adopts a sensor ring formed by coating a graphene oxide film on a micro-nano high birefraction fiber. The optical fiber biological sensor is based on cascade effect and Sagnac interference, and compared with the traditional single-ring Sagnac interferometer, the optical fiber biological sensor has the advantages that the two cascade Sagnac interference rings can improve the sensitivity and detection limit of the sensor, and can output spectrum with vernier effect, the sensitivity is high, the cost is low, the optical fiber biological sensor is simple to manufacture, the temperature variation sensitivity is low, and the stability is good.

Description

technical field [0001] The invention belongs to optical fiber sensing technology, relates to a sensor of an optical fiber Sagnac interferometer, in particular to a novel micro-nano high-birefringence Sagnac optical fiber biosensor. Background technique [0002] Phase modulation optical fiber sensor is a common optical fiber sensing technology, which has the advantages of high precision and high sensitivity, and the sensitivity of the system can be adjusted by changing the length of the sensing fiber. If a phase modulation optical fiber sensor is used, the frequency of the light wave is usually all in 10 14 Above Hz, it is impossible to use traditional instruments to directly measure the phase change of light. At this time, the method of interference is used to convert the phase change of light into intensity change. Therefore, the phase demodulation in the system needs to be realized by an interferometer. , There are four commonly used interference structures: Michelson typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/23
CPCG01N21/23
Inventor 王琦王雪州李国存井建迎赵万明汪颖
Owner NORTHEASTERN UNIV
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