SPR heavy metal ion sensing head of long-period fiber grating and production method thereof

A technology of heavy metal ions and optical fiber gratings, which is applied in the direction of material analysis, measuring devices, instruments, etc. through optical means, can solve the problems of cumbersome detection and troublesome heavy metal ion detection, and achieve the effect of fast detection

Active Publication Date: 2016-10-12
GUANGDONG OCEAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These traditional instrumental analysis and test methods have their own advantages, but the detection is

Method used

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  • SPR heavy metal ion sensing head of long-period fiber grating and production method thereof
  • SPR heavy metal ion sensing head of long-period fiber grating and production method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0028] Example 1

[0029] Such as figure 1 As shown, a long-period fiber grating SPR heavy metal ion sensor head includes a long-period fiber grating (LPG), a metal film 4, and a modified chitosan film 5. The long-period fiber grating includes a fiber containing a grating 3. The core 1 and the cladding 2 attached to the core 1, the period of the grating 3 is 100-500μm, the surface of the cladding 2 in the area of ​​the grating 3 is plated with a 30-200nm thick metal film 4, the surface of the metal film 4 A modified chitosan film 5 with a thickness of 30 to 500 nm is prepared, and the modified chitosan film 5 can adsorb heavy metal ions.

[0030] In the specific implementation process, such as figure 2 As shown, the long-period fiber grating includes multiple groups of gratings 3 with different periods. The regions of the gratings 3 with different periods have different modified chitosan films 5, and different modified chitosan films 5 can adsorb different heavy metal ions. , So...

Example Embodiment

[0034] Example 2

[0035] A method for manufacturing a long-period fiber grating SPR heavy metal ion sensor head for manufacturing the long-period fiber grating SPR heavy metal ion sensor head of Example 1, including the following steps:

[0036] S1: Put the long-period fiber grating in absolute ethanol and clean it with ultrasonic for 3-8 minutes twice, then wipe the cladding surface of the long-period fiber grating clean with absorbent cotton dipped in absolute ethanol and dry;

[0037] S2: The long-period fiber grating, which has been wiped clean and dried, is plated with a metal film on the cladding surface of the grating area, with a thickness of 30~200nm;

[0038] S3: According to the performance requirements of the fiber grating SPR heavy metal ion sensor head, prepare a chitosan solution with a mass concentration of 1-5% with acetic acid with a mass concentration of 0.5-5% until the chitosan solution becomes clear and viscous. Immediately modify the chitosan. Different modifie...

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Abstract

The invention discloses a SPR heavy metal ion sensing head of long-period fiber grating and a production method thereof. The sensing head comprises the long-period fiber grating, a metallic film and a modified chitosan film, the long-period fiber grating comprises a fiber core containing a raster and a coating layer attached on a fiber core, the period of the raster is 100-500 mum, a layer of the metallic film with thickness of 30-200 nm is coated on the surface of the coating layer in a raster area, the modified chitosan film with thickness of 30-500 nm is prepared on the surface of the metallic film, and the modified chitosan film can absorb the heavy metal ions. While in use, the modified chitosan film is used for absorbing the specific heavy metal ions, an optical signal is radiated from one end to the other end, by passing through the long-period fiber grating, the optical signal with specific wavelength is coupled and introduced into the coating layer, and a surface plasma resonance signal is generated on a metallic film interface, wavelength of the surface plasma resonance signal generates offset with change of concentration of heavy metal ions, and the heavy metal ions can be rapidly detected in a simple mode according to the wavelength offset amount.

Description

technical field [0001] The present invention relates to the intersecting fields of optical fiber technology, surface plasmon resonance (SPR) technology of optical fiber grating, polymer material and thin film preparation technology thereof, more specifically, relates to a long-period optical fiber grating SPR heavy metal ion sensing head and its manufacturing method . Background technique [0002] Lead, mercury, cadmium and other heavy metals pollute water and soil, and are difficult to degrade. They are absorbed by drinking water or aquatic plants and enter the human body along the food chain. They can be continuously deposited and enriched in organisms, causing food safety problems and endangering people's health. cause great harm. For people's healthy life, the detection of heavy metal content is particularly important, and it is of great significance to study the selective and highly sensitive detection method and sensing mechanism of heavy metal ions. [0003] The det...

Claims

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Application Information

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IPC IPC(8): G01N21/552
CPCG01N21/553
Inventor 王文华李思东吴伟娜熊正烨师文庆黄江田秀云费贤翔
Owner GUANGDONG OCEAN UNIVERSITY
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