Optical fiber sensor for copper ion detection and preparation method thereof

Abstract

The invention provides an optical fiber sensor for copper ion detection and a preparation method thereof. The sensor comprises a two-mode fiber Mach-Zehnder interferometer, a broadband light source and a spectrograph, wherein the broadband light source is connected with one end of the interferometer, the other end of the interferometer is connected with the spectrum analyzer, the interferometer is used for enabling a dropped solution containing copper ions to serve as a carrier, the interferometer is prepared by a two-mode optical fiber through a melting and tapering method, and a surface of the interferometer is functionalized by using lead sulfide quantum dots modified by macromolecules; and the spectrum analyzer is used for observing the interference spectrum condition. Compared with the prior art, the optical fiber sensor for copper ion detection is low in cost, relatively high in detection sensitivity on a copper ion solution and high in detection precision.

Description

Technical field

[0001] The present invention relates to the field of copper ion detecting devices, in particular, a fiber optic sensor and a preparation method thereof based on copper ion detection based on model optical fiber Mach-Zeir Delwell. Background technique

[0002] Metal ions have become one of the main pollutants that endanger human health. The metal ions have accumulated through the food chain into the organism, and ultimately destroy normal metabolic activities in the human body. Copper ion (Cu 2+ ) Is one of the most abundant metal ions in the organism, and is also a trace element that the animals are necessary, but if the human body 2+ The concentration exceeds the standard, which will have a great harm to human health. Short-term exposure to high concentrations of Cu 2+ It will lead to digestive system disorders, long-term exposure can lead to liver and kidney damage. According to reports, in the human body Cu 2+ The concentration is closely related to some severe...

Examples

Embodiment 1

[0041] In the present embodiment, referring to figure 1 A copper ion detecting optical fiber sensor, comprising a two-mode optical fiber Mach - Zehnder interferometer 2, a broadband light source and the spectrometer 1 3; 1 is connected to the broadband light source 2 end of the interferometer, the interferometer 2 and the other end connected to a spectrum analyzer 3 2 was added dropwise a solution for copper ion donor as a carrier of the interferometer, said interferometer 2 prepared by melting by tapering method is two-mode fiber, and using a polymer modified functionalized lead sulfide QDs interfering instrument face, a spectrum analyzer to observe the three spectral interferences.

[0042] figure 1 1 illustrates a broadband light source, a schematic view of an interferometer spectrometer 2 and 3 are connected in sequence, wherein the interferometer is located in the middle of the sensor 2, and is fixed above the dish surface, the dish surface for holding the copper ion solutio...

Embodiment 2

[0044] In the present embodiment, referring to figure 1 Process for preparing an optical fiber sensor detecting a copper ion, comprising the steps of preparing:

[0045] a. Preparation of polymer;

[0046] b. Preparation and modification of the source quantum dots of the sulfide;

[0047] Preparation and modification of Mach - Zeng Del Interferometer;

[0048] D. broadband light source 1, an interferometer 2, 3 and the spectrometer assembly of the connector.

[0049] In this embodiment, a relatively high refractive index sensitivity two-mode optical fiber Mach - Zehnder interferometer as a detection carrier, improve the detection efficiency and accuracy, the present method is simple and easy to operate.

Embodiment 3

[0051] The present embodiment is substantially the same as the second embodiment, special follows:

[0052] In this embodiment, a preparation method of a polymer, comprising the steps of:

[0053] a-1. 4-cyano-4- (ethylthio Thiocarboxyamido thio) pentanoic acid (18.5mg, 0.07mmol), polyethylene glycol methacrylate (Mn = 475) (1.672g, 3.5mmol), succinic acid mono [2 - [(2-methyl - acryloyl) oxy] ethyl] ester (809.8mg, 3.5mmol), DMF 350mg as internal reference, was dissolved in 5 mL 1,4-dioxane , first in an ice bath was bubbled oxygen 30min, transferred to an oil bath at 70 deg.] C.

[0054] a-2. After the temperature was stabilized, oxygen is added using a micro syringe containing a solution in 1,4-dioxane 3.5mgAIBN reaction for 16 h, calculated by NMR monomer conversion was 100%, Mn = 17900. Copolymers prepared.

[0055] A-3. After the reaction, the reaction solution was precipitated in diethyl ether, centrifuged, and the precipitate was repeated three times, and the solvent was s...

Technical field

[0001] The present invention relates to the field of copper ion detecting devices, in particular, a fiber optic sensor and a preparation method thereof based on copper ion detection based on model optical fiber Mach-Zeir Delwell. Background technique

[0002] Metal ions have become one of the main pollutants that endanger human health. The metal ions have accumulated through the food chain into the organism, and ultimately destroy normal metabolic activities in the human body. Copper ion (Cu 2+ ) Is one of the most abundant metal ions in the organism, and is also a trace element that the animals are necessary, but if the human body 2+ The concentration exceeds the standard, which will have a great harm to human health. Short-term exposure to high concentrations of Cu 2+ It will lead to digestive system disorders, long-term exposure can lead to liver and kidney damage. According to reports, in the human body Cu 2+ The concentration is closely related to some severe...

Examples

Embodiment 1

[0041] In the present embodiment, referring to figure 1 A copper ion detecting optical fiber sensor, comprising a two-mode optical fiber Mach - Zehnder interferometer 2, a broadband light source and the spectrometer 1 3; 1 is connected to the broadband light source 2 end of the interferometer, the interferometer 2 and the other end connected to a spectrum analyzer 3 2 was added dropwise a solution for copper ion donor as a carrier of the interferometer, said interferometer 2 prepared by melting by tapering method is two-mode fiber, and using a polymer modified functionalized lead sulfide QDs interfering instrument face, a spectrum analyzer to observe the three spectral interferences.

[0042] figure 1 1 illustrates a broadband light source, a schematic view of an interferometer spectrometer 2 and 3 are connected in sequence, wherein the interferometer is located in the middle of the sensor 2, and is fixed above the dish surface, the dish surface for holding the copper ion solutio...

Embodiment 2

[0044] In the present embodiment, referring to figure 1 Process for preparing an optical fiber sensor detecting a copper ion, comprising the steps of preparing:

[0045] a. Preparation of polymer;

[0046] b. Preparation and modification of the source quantum dots of the sulfide;

[0047] Preparation and modification of Mach - Zeng Del Interferometer;

[0048] D. broadband light source 1, an interferometer 2, 3 and the spectrometer assembly of the connector.

[0049] In this embodiment, a relatively high refractive index sensitivity two-mode optical fiber Mach - Zehnder interferometer as a detection carrier, improve the detection efficiency and accuracy, the present method is simple and easy to operate.

Embodiment 3

[0051] The present embodiment is substantially the same as the second embodiment, special follows:

[0052] In this embodiment, a preparation method of a polymer, comprising the steps of:

[0053] a-1. 4-cyano-4- (ethylthio Thiocarboxyamido thio) pentanoic acid (18.5mg, 0.07mmol), polyethylene glycol methacrylate (Mn = 475) (1.672g, 3.5mmol), succinic acid mono [2 - [(2-methyl - acryloyl) oxy] ethyl] ester (809.8mg, 3.5mmol), DMF 350mg as internal reference, was dissolved in 5 mL 1,4-dioxane , first in an ice bath was bubbled oxygen 30min, transferred to an oil bath at 70 deg.] C.

[0054] a-2. After the temperature was stabilized, oxygen is added using a micro syringe containing a solution in 1,4-dioxane 3.5mgAIBN reaction for 16 h, calculated by NMR monomer conversion was 100%, Mn = 17900. Copolymers prepared.

[0055] A-3. After the reaction, the reaction solution was precipitated in diethyl ether, centrifuged, and the precipitate was repeated three times, and the solvent was s...

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