Prism SPR (Surface Plasma wave Resonance) high-sensitivity fiber liquid refractive index sensor

A liquid refractive index and high-sensitivity technology, which is applied in the field of SPR-based measurement of liquid refractive index, can solve the problems that the sensitivity cannot be further improved, cannot be adopted, and the accuracy can be improved, so as to eliminate the instability of compensation light source intensity, reduce energy loss, and eliminate interference effect

Inactive Publication Date: 2009-09-09
ZHONGBEI UNIV
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Problems solved by technology

This sensing method does not use a polarization-maintaining fiber collimator and a polarization-maintaining fiber Y-shaped coupler, so the method proposed in Document 1 cannot be used to improve accuracy; nor is a total reflection prism used to make a beam of measurement ligh

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  • Prism SPR (Surface Plasma wave Resonance) high-sensitivity fiber liquid refractive index sensor
  • Prism SPR (Surface Plasma wave Resonance) high-sensitivity fiber liquid refractive index sensor
  • Prism SPR (Surface Plasma wave Resonance) high-sensitivity fiber liquid refractive index sensor

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Embodiment Construction

[0026] The specific implementation method of the present invention will be described below in conjunction with the accompanying drawings.

[0027] figure 1 As shown, a prism SPR high-sensitivity optical fiber liquid refractive index sensor of the present invention includes a laser emitting device composed of a pulse laser 1 and a pulse signal generator 8, a device for generating and transmitting TM light waves, an excitation SPR device, a light wave receiving device, Amplification and A / D conversion and data processing device, it is characterized in that: described excitation SPR device is a bundle of incident light twice excitation SPR device; Described one bundle of incident light twice excitation SPR device is composed of isosceles prism 1301, Metal thin film 1302 and to-be-measured liquid medium 1303 constitute a Kretchemann structure 13 and a total reflection device 14; wherein:

[0028] The TM light wave generation and transmission device includes a P light polarizer 2,...

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Abstract

The invention relates to a prism SPR (Surface Plasma wave Resonance) high-sensitivity fiber liquid refractive index sensor, which is mainly characterized in that a laser light is coupled to a Y-shaped polarization-maintaining fiber coupler by a P-laser polarizer and a polarization-maintaining fiber collimator; the SPR is excited twice by the laser light outgoing from a sensing light branch polarization-maintaining fiber collimator; the reflection light reaches a sensing light branch optical-to-electrical converter after the two times of SPR excitation; a laser light outgoing from a reference light branch fiber collimator is coupled to a reference light branch optical-to-electrical converter; the light signals are converted into electrical signals by the reference light branch optical-to-electrical converter and the sensing light branch optical-to-electrical converter; the electrical signals are transmitted to an amplifier and an A/D converter; and the converted digital signals are transmitted to a data processing device for data processing. The invention has a simple structure, reduces the energy loss of P-laser, improves the signal-to-noise ratio and the sensitivity and allows long-distance application.

Description

technical field [0001] The invention belongs to the technique of measuring liquid refraction index based on SPR, in particular to an intensity modulation type prism SPR high-sensitivity optical fiber liquid refraction index sensor. Background technique [0002] Surface plasmon wave resonance (SPR) is a physical optical phenomenon that occurs at the interface between metals and dielectrics, and it is very sensitive to changes in the refractive index of the surrounding medium. At present, the sensor structure based on the SPR effect has been widely used in liquid substance detection technology, such as biochemistry, environmental monitoring, drug development and food safety, and has been widely used in the detection of gene mutations, the determination of biomolecular reaction kinetics, and the monitoring of industrial wastewater and waste gas. to make significant progress. There are four detection and analysis methods for prism sensors based on SPR: [0003] (1) Angle modul...

Claims

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Application Information

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IPC IPC(8): G01N21/55
Inventor 张志伟温庭敦武志芳
Owner ZHONGBEI UNIV
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