MZ interference SPR chemical and biological sensor and system with fibre-optical microstructure

A biosensor and microstructure technology, applied in the fields of biology, chemistry, and optical fiber sensing, can solve problems such as difficult alignment and debugging, large stray light interference, and difficulties, and achieve good controllability of production quality, low signal light noise, The effect of simple external structure

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

[0016] There are also some defects in this type of sensor and system: (1) The prism-type sensor head is complex and bulky
The production of the optical fiber sensor head is cumbersome and difficult, and the cladding needs to be removed by chemical corrosion or mechanical abrasion, and the removal position or size of the cladding is difficult to precisely control
It is also difficult to fabricate a metal diffraction grating type sensor head
(2) The stability of the system is poor: whether it is wavelength modulation or angle modulation method, the signal detected directly is the light intensity, and it is the light intensity of a single optical path
The fluctuation and interference of the light source, optical path and circuit system have a great impact on the sensing system, reducing the reliability and accuracy
In the existing single light path intensity detection, this effect is difficult to eliminate
(3) Strong stray light interference: In the three SPR sensors of prism type, metal grating type and fiber optic type, stray light can enter the optical path and detector
(4) For fiber optic sensors, after chemical corrosion or mechanical abrasion of the cladding, there will be a rough interface, and it is difficult to obtain a smooth optical surface of the fiber core, which will affect the total reflecti

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  • MZ interference SPR chemical and biological sensor and system with fibre-optical microstructure
  • MZ interference SPR chemical and biological sensor and system with fibre-optical microstructure
  • MZ interference SPR chemical and biological sensor and system with fibre-optical microstructure

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[0034] The following is an example of the measurement of the concentration of glucose solution to illustrate the implementation of the above-mentioned sensor and system in conjunction with the accompanying drawings. The composition of the biomolecule and chemical composition measurement system and the sensor in the form of gas or other solutions is similar, and the difference is only in the optical fiber. A different chemical or biomolecule sensitive film layer is cured on the metal film layer outside the cladding layer.

[0035] See Figure 4 , The structure of the sensor consists of: optical fiber coating layer 1, optical fiber cladding layer 2, optical fiber core 3, long-period fiber grating LPFG14, metal film layer 5, chemical or biological molecule absorption or sensitive film layer 6, long-period fiber grating LPFG27, protective cover 8, curing glue 9, plastic transition buffer cover 10. Its production method is: (1) remove a small section of plastic protective coating of an...

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Abstract

A chemical and biological transducer is prepared by setting two long period fibre gratings, fibre covering and fibre core on one piece of fibre to form a MZ interferometer and then plating a metal film on fibre covering surface to form SPR transducer of fibre MZ interferometer structure. The sensing system comprises wide band light source, fibre, chemical and biological transducer formed as above, fibre spectrograph and computer as said transducer is set in gas or solution of chemical composition or biological molecule to be tested.

Description

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Claims

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Application Information

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Owner 重庆工学院
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