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Method for simultaneously detecting chiral parameter and refractive index based on long-period fiber grating

A technology of optical fiber grating and refractive index, which is applied in the direction of transmittance measurement, material analysis through optical means, and measurement devices, etc., can solve the problems of insufficient sensitivity and difficulty in detecting small chiral parameters, and solve the problem of insufficient sensitivity and eliminate Effect of limitations, high sensitivity

Active Publication Date: 2019-11-22
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, this method has disadvantages such as difficulty in detecting small chiral parameters and insufficient sensitivity.

Method used

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  • Method for simultaneously detecting chiral parameter and refractive index based on long-period fiber grating
  • Method for simultaneously detecting chiral parameter and refractive index based on long-period fiber grating
  • Method for simultaneously detecting chiral parameter and refractive index based on long-period fiber grating

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Embodiment Construction

[0056] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0057] The improved optical fiber guided wave theory of the present invention is:

[0058] 1 Debye potential function in chiral drugs

[0059] Debye Potential Function Ψ in Chiral Drugs 4 and Φ 4 It can be expressed as

[0060]

[0061] Among them, the wave numbers of the left and right circularly polarized waves in the chiral drug are

[0062]

[0063] r is the fiber radius, K ν Bessel function of the second type of deformation, v is the angular order of the mode, j is the imaginary unit, A 4 and B 4 Represents the undetermined coefficient of the electromagnetic field of the chiral drug environment layer, n 4 and γ are the refractive index and chiral parameters of the chiral drug, n eff is the effective refractive index of the fiber cladding mode, k 0 is the propagation constant of electromagnetic waves in free space.

[0064...

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Abstract

The invention discloses a method for simultaneously detecting the chiral parameters and refractive index based on a long-period fiber grating, which belongs to the technical field of optical fiber sensing. Through an improved optical fiber guided wave theory, a coupled mode theory and a genetic algorithm, the method enables a coated long-period fiber grating to quickly and simultaneously sense thecomplex chiral parameters and refractive indexes of chiral drugs. The method is especially suitable for fields such as optical fiber sensing and imaging information, information and biomedical engineering, and drug research and development.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a method for simultaneously detecting chiral parameters and refractive indices based on long-period optical fiber gratings. Background technique [0002] With the continuous advent of new mechanisms, special optical fibers and new technologies, optical fiber sensing is widely used in electronics, information, life, national defense, aerospace and other fields. Long-period fiber gratings, as a highly sensitive, light-weight, fast-response, and non-destructive biological sensing technology, can monitor the entire process of various molecular interactions online in real time and dynamically, and monitor the physical, biological, and chemical parameters of substances. Due to its outstanding advantages, it occupies a very important position in the field of life science and drug research and development, and will definitely become one of the main research dire...

Claims

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Application Information

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IPC IPC(8): G01N21/59G01N21/41
CPCG01N21/41G01N21/59G01N2021/5903
Inventor 王茂琰李海龙范博徐彤徐军李桂萍喻梦霞董宇亮张小川姜宝钧
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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