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Unmarked combined few-mode fiber evanescent field biosensor

A biosensor and few-mode optical fiber technology, which is applied in cladding optical fiber, optical waveguide light guide, color/spectral characteristic measurement, etc., can solve the problem of large space occupation, low flexibility of optical path layout, and difficulty in miniaturization and portability of instruments, etc. problems, to achieve the effects of reducing production costs, improving sensitivity, and facilitating miniaturization and integration

Inactive Publication Date: 2009-09-02
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flexibility of the optical path layout is low, and it takes up a lot of space, making it difficult to realize the miniaturization and portability of the instrument

Method used

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  • Unmarked combined few-mode fiber evanescent field biosensor
  • Unmarked combined few-mode fiber evanescent field biosensor

Examples

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Embodiment Construction

[0014] The following embodiments are given with reference to the accompanying drawings to further describe the structure of the evanescent field biosensor of the present invention in combination with standard-free few-mode optical fibers.

[0015] refer to figure 1 , figure 2 , a standardless combined few-mode optical fiber evanescent field biosensor, comprising a light source 1 and a focusing lens group 2 connected in sequence, a first bare optical fiber converter 3, and a few-mode sensor part placed in a sample cell 5 Sensing optical fiber 4, the second bare optical fiber converter 6, photoelectric signal collector 7, described few-mode sensing optical fiber 4 is made up of sensing segment 403 and the sensing segment of the bare fiber core that diameter is the order of micrometers A transmission section 404 with an optical fiber cladding 401 is formed at both ends, respectively connected by a tapered transition section 402 .

[0016] Light source 1 is a red LED with a cen...

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Abstract

The invention relates to a biosensor for organisms, in particular to an unmarked combined few-mode fiber evanescent field biosensor. The biosensor comprises a light source as well as a focusing lens group, a first bare fiber converter, a few-mode sensing fiber, a second bare fiber converter and a photoelectric signal collector which are sequentially connected, wherein the sensing section of the few-mode sensing fiber is arranged in a sample cell. The few-mode sensing fiber comprises a sensing section of a bare fiber core and transferring sections, wherein the diameter of the sensing section is in a micron dimension, and the transferring sections are arranged at both ends of the sensing section and respectively connected with both ends through tapered transition sections. The evanescent field excited by the few-mode sensing fiber with the tapered transition sections at both ends has high erergy, biological identification molecules on the fiber surface not only form a weak conduction condition but also strengthen the interaction between the evanescent field and a substance molecule to be detected, thus the sensitivity of the biosensor is greatly improved.

Description

technical field [0001] The invention belongs to a biological detection instrument, in particular to an optical fiber evanescent field biosensor that utilizes the optical fiber evanescent field to interact with biological matter within the energy penetration range of the evanescent field to cause the energy transmitted in the optical fiber to absorb and realize the detection of biological matter . Background technique [0002] The optical fiber evanescent field biosensor utilizes when light propagates in the optical fiber in the form of total internal reflection, an evanescent field is generated in the medium where the sensing optical fiber is located, and biological substances within the penetration range of the evanescent field excited by the sensing optical fiber and the evanescent field Interaction occurs, causing energy absorption, which is reflected as a decrease in the overall light intensity output by the optical fiber, thereby realizing the detection of the concentra...

Claims

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Application Information

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IPC IPC(8): G01N21/31G02B6/02
Inventor 吴一辉庄须叶王淑荣张志强张平刘永顺
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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