Interference evanescent wave chemical and biological sensor and system with fibre-optical Michelson

A biosensor, optical fiber technology, applied in the fields of biology, chemistry, and optical fiber sensing, can solve the problems of difficult long-distance transmission of optical signals, difficult to make full use of the advantages of optical fibers, affecting detection accuracy, etc., to achieve system assembly and its composition is simple, The production quality is controllable and the system is stable and reliable.

Inactive Publication Date: 2005-12-28
重庆工学院
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Problems solved by technology

[0008] At present, there are still many shortcomings and deficiencies in optical fiber evanescent wave chemical and biological sensors, mainly as follows: (1) The production of the sensing head is cumbersome and difficult: the optical fiber sensing head needs to remove the cladding by chemical corrosion or mechanical abrasion , it is difficult to precisely control the removal position or size of the cladding; in addition, after chemical corrosion or mechanical abrasion of the cladding, it is difficult to obtain a smooth optical surface of the fiber core, and a rough interface will appear, thereby affecting the total reflection characteristics of light at the interface or other optical properties
(2) The measurement accuracy is low: due to the single optical path intensity measurement method, the fluctuation and interference of the light source, optical path and circuit system have a great impact on the sensing system, such as the instability of the driving circuit, the aging or drift of the light source, The bending of the optical fiber, the fluctuation of the optical path environment, the drift and instability of the detection system will reduce the reliability and accuracy of the measurement data
When the external stray light changes, the fluorescent signal obtained by the detector

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  • Interference evanescent wave chemical and biological sensor and system with fibre-optical Michelson
  • Interference evanescent wave chemical and biological sensor and system with fibre-optical Michelson
  • Interference evanescent wave chemical and biological sensor and system with fibre-optical Michelson

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[0023] The following is to measure the gas propane (C 3 H 3 ) As an example, the implementation of the above-mentioned sensor and sensing system will be further described with reference to the accompanying drawings. The implementation method of measuring biomolecules and chemical components in other gases or solutions is similar to it, the difference is only in the optical fiber of the sensing section. The fiber cladding is just a layer of different chemical or biomolecule sensitive films. One of the spectral absorption peaks of propane molecules is at 1680nm, with a bandwidth of about 10-20nm.

[0024] See figure 1 The structure of the sensor includes optical fiber coating layer 1, optical fiber cladding layer 2, optical fiber core 3, long-period fiber grating LPFG 4, chemical composition or biological molecule absorption or sensitive film layer 5, reflective film 6, protective cover 7, End curing glue 8, curing glue 9, and transition buffer sleeve 10. The manufacturing method i...

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Abstract

A chemical and biological transducer is prepared by setting long period fibre grating, reflecting film on fibre section, fibre covering and fibre core on one piece of fibre to for a Michelson interferometer and then forming a fibre evanescent wave chemical and biological transducer based this interferometer. The sensing system comprises wide band light source, fibre, chemical and biological transducer formed as above, wide band coupler, fibre spectrograph and computer.

Description

technical field [0001] The invention belongs to the technical fields of optical fiber sensing, biology and chemistry, and in particular relates to an optical fiber micro-Michelson interference evanescent wave chemical and biological sensor and a system thereof. Background technique [0002] Optical fiber chemical and biological sensors are a new type of sensing technology that was born in the mid-1970s. This sensor is an indicator dye, enzyme, coenzyme, biological receptor, antigen, etc. , antibodies, nucleic acids, DNA, animal and plant tissues or cells, microorganisms, polymer materials, etc., sensitive membranes, sol-gels or themselves are adsorbed, solidified or installed on optical fibers, planar optical waveguides, and capillary waveguides. Selectively identify the measured substance, and then convert it into various optical information, such as absorption, reflection, fluorescence, phosphorescence, chemiluminescence and bioluminescence, Raman scattering, photoacoustic...

Claims

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Application Information

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IPC IPC(8): G01N21/17
Inventor 曾祥楷
Owner 重庆工学院
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