CN115825008B - Method for improving LPFG response range - Google Patents
Method for improving LPFG response rangeInfo
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- CN115825008B CN115825008B CN202211486188.6A CN202211486188A CN115825008B CN 115825008 B CN115825008 B CN 115825008B CN 202211486188 A CN202211486188 A CN 202211486188A CN 115825008 B CN115825008 B CN 115825008B
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- phytic acid
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- polydiallyldimethylammonium chloride
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Abstract
本发明属于长周期光纤光栅传感技术领域，主要涉及一种提高LPFG响应范围的方法，特别是一种提高LPFG对液体响应范围的方法。所述的提高LPFG响应范围的方法是通过采用氯化钠、植酸与聚二烯丙基二甲基氯化铵等试剂，在LPFG表面制备聚二烯丙基二甲基氯化铵/植酸多层纳米薄膜，通过聚二烯丙基二甲基氯化铵/植酸多层纳米薄膜对LPFG透射光谱的调控，进而达到提高LPFG对环境介质响应范围的目的。该方法具有成本低廉、制备简易的优点。通过该方法修饰的LPFG，无需高分辨率的仪器及复杂的解调技术即可实现对环境介质的高灵敏检测。
The present invention belongs to the field of long period fiber grating sensing technology, and mainly relates to a method for improving the response range of LPFG, and in particular to a method for improving the response range of LPFG to liquid. The method for improving the response range of LPFG is to prepare a polydiallyldimethylammonium chloride/phytic acid multilayer nanofilm on the surface of LPFG by using reagents such as sodium chloride, phytic acid and polydiallyldimethylammonium chloride, and to regulate the transmission spectrum of LPFG by the polydiallyldimethylammonium chloride/phytic acid multilayer nanofilm, thereby achieving the purpose of improving the response range of LPFG to the environmental medium. The method has the advantages of low cost and simple preparation. The LPFG modified by this method can achieve high-sensitivity detection of the environmental medium without high-resolution instruments and complex demodulation technology.
Description
Technical Field
The invention belongs to the technical field of long-period fiber bragg grating sensing, relates to a method for improving an LPFG response range, and particularly relates to a method for improving an LPFG response range to liquid.
Background
The long period fiber gratings (Long period fiber gratings, LPFGs) are the most important optical passive devices which are manufactured by periodically modulating the refractive index of the fiber core and can enable light to be coupled from the fundamental mode of the fiber core transmitted in the forward direction to the cladding mode transmitted in the same direction. The LPFG has the unique advantages of electromagnetic interference resistance, corrosion resistance, light weight, small volume, easy compatibility with photoelectric system and the like, no back reflection, low insertion loss, high sensitivity and the like, and thus, the LPFG has received extensive attention in the fields of communication and sensing. LPFG has been used in a number of fields of fiber optic communications, temperature, stress, loading, bending, bioanalytical, chemical sensing, etc., for the last two decades.
An important property of the LPFG is that the change in refractive index can be perceived. The physical and chemical properties of the environmental medium, such as the species of the substance, the purity of the substance, the concentration of the substance, and other optical properties of the substance, can be judged by sensing the refractive index of the environmental medium. The detection of the refractive index has important research significance and wide application value in the fields of seawater, fermentation industrial engineering control, clinical examination, drug screening, food quality monitoring, environmental monitoring, metallurgy, scientific research and the like. Heretofore, many devices for refractive index measurement have been developed, mainly including bragg fiber grating sensors, abbe refractometers, fabry-perot interferometric sensors, surface plasmon resonance sensors, photonic crystal fibers, ring resonators, and the like. Compared with the refractive index sensors, the LPFG has the advantages in refractive index measurement, and is particularly suitable for refractive index measurement of liquid or gas which is bad in environment and is not easy to contact with human bodies.
However, in general, the LPFG exhibits a wavelength shift in which the resonance peak disappears or is very small for refractive indexes higher than 1.453. Whereas for refractive indices below 1.345, the resonant wavelength of the LPFG hardly shifts. Thus, there is a limit to the range of response of the LPFG to the refractive index, which greatly limits the practical application of the LPFG. It is necessary to expand the response range of the long period fiber grating to the refractive index to realize the high sensitivity detection of the LPFG to the refractive index.
Disclosure of Invention
In view of the foregoing, the present invention addresses the above-described shortcomings of the LPFG by providing a method of increasing the response range of the LPFG, and in particular, a method of increasing the response range of the LPFG to liquid.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention relates to a method for improving the LPFG response range, which adopts the technical scheme that the LPFG response range is improved by adopting a method for modifying a nano film on the surface of the LPFG.
The nano film is prepared from sodium chloride, phytic acid, polydiallyl dimethyl ammonium chloride and other reagents.
Preferably, the modified nano film is formed by alternately depositing polydiallyl dimethyl ammonium chloride and phytic acid on the surface of the long-period grating;
The reason why polydiallyl dimethyl ammonium chloride and phytic acid are selected as the nano-film is that the polydiallyl dimethyl ammonium chloride and the phytic acid have strong binding force, and the polydiallyl dimethyl ammonium chloride has strong swelling capacity in water, so that the resonance wavelength of LPFG in water and sodium chloride solution has large difference.
Preferably, the reagent polydiallyl dimethyl ammonium chloride has a molecular weight of 5000-3000000.
Preferably, the solution used for depositing the polydiallyl dimethyl ammonium chloride is a polydiallyl dimethyl ammonium chloride solution containing sodium chloride, and the solution used for depositing the phytic acid is a phytic acid solution containing sodium chloride, wherein the molar concentration ratio of the sodium chloride to the phytic acid is 0.05-300.
Preferably, the molar concentration ratio of sodium chloride to polydiallyl dimethyl ammonium chloride in the polydiallyl dimethyl ammonium chloride solution is between 0.05 and 300.
Preferably, the phytic acid solution is deposited for 5-15 minutes each time, and the polydiallyl dimethyl ammonium chloride solution is deposited for 10-30 minutes each time.
Preferably, the modification method comprises the following main steps:
① Immersing LPFG into concentrated sulfuric acid and hydrogen peroxide with the volume ratio of 7:3, and treating for 1 hour at 80 ℃;
② Washing LPFG with deionized water for 6 times, and drying with nitrogen;
③ Straightening and fixing the LPFG on a liquid tank bracket;
④ Adding a polydiallyl dimethyl ammonium chloride solution containing sodium chloride into a liquid pool for deposition;
⑤ Flushing the deposited LPFG for 6 times by using secondary deionized water, and drying by using nitrogen;
⑥ Adding a phytic acid solution containing sodium chloride into a liquid pool for soaking for a plurality of minutes;
⑦ Flushing the long-period grating for 6 times by using secondary deionized water, and drying by using nitrogen;
⑧ Repeating ④-⑦ steps to obtain the polydiallyl dimethyl ammonium chloride/phytic acid multilayer nano film with wide response range to liquid.
Compared with the prior art, the invention has the following beneficial effects:
Compared with the LPFG of the unmodified polydiallyl dimethyl ammonium chloride/phytic acid multilayer nano film, the method for improving the LPFG response range has the advantages that the response range to an environment medium is remarkably widened, and the sensitivity to the environment medium is remarkably improved.
The method for improving the LPFG response range can realize high-sensitivity detection of environmental media without using high-resolution instruments and complex demodulation techniques.
The method for improving the LPFG response range has the advantages of simple preparation process, low cost and no need of special technical personnel operation.
According to the method for improving the LPFG response range, the mechanical strength resistance of the LPFG can be improved by using the polydiallyl dimethyl ammonium chloride/phytic acid multilayer nano film for modification.
The method for improving the LPFG response range has wide commercial application prospect in the fields of seawater salinity, food safety, environmental monitoring and the like, and is expected to be widely popularized and applied.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of transmission spectra and detection range of LPFG response to environmental media without assembled polydiallyl dimethyl ammonium chloride/phytic acid nanofilm;
FIG. 2 is a graphical representation of transmission spectra and detection range of LPFG response to environmental media for an assembled 50 bilayer polydiallyl dimethyl ammonium chloride/phytic acid nanofilm;
FIG. 3 is a graphical representation of transmission spectra and detection range of LPFG response to environmental media for assembled 80 bilayer polydiallyl dimethyl ammonium chloride/phytic acid nanofilm.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
(1) Immersing LPFG into concentrated sulfuric acid and hydrogen peroxide with the volume ratio of 7:3 for treatment at 80 ℃ for 1 hour;
(2) Flushing the long-period grating for 6 times by deionized water, and drying by nitrogen;
(3) Straightening and fixing the LPFG on a liquid tank bracket;
(4) Adding a polydiallyl dimethyl ammonium chloride solution containing sodium chloride into a liquid pool, and soaking for 10 minutes;
(5) Flushing the long-period grating for 6 times by using secondary deionized water, and drying by using nitrogen;
(6) Adding a phytic acid solution containing sodium chloride into a liquid pool, and soaking for 8 minutes;
(7) Flushing the long-period grating for 6 times by using secondary deionized water, and drying by using nitrogen;
(8) The steps (4) - (7) were repeated 50 times.
In order to further optimize the technical scheme, the molecular weight of the polydiallyl dimethyl ammonium chloride is 5000-3000000;
In order to further optimize the technical scheme, the molar concentration ratio of sodium chloride to polydiallyl dimethyl ammonium chloride in the polydiallyl dimethyl ammonium chloride solution is between 0.05 and 300.
As shown in fig. 1, the resonance wavelength of the LPFG without the assembled polydiallyl dimethyl ammonium chloride/phytic acid nanofilm shifted 88nm when the refractive index of the ambient medium was varied from 1.33303 to 1.45389. When the refractive index of the ambient medium becomes 1.45839, the resonance peak of the LPFG vanishes and the transmission spectrum of the LPFG becomes a straight line in the wavelength range of 1100-1300. Thus, the maximum range of LPFG response to ambient medium for unassembled polydiallyl dimethyl ammonium chloride/phytic acid nanofilm was 88nm.
When a 50 bilayer polydiallyl dimethyl ammonium chloride/phytic acid nanofilm was assembled, the maximum range of LPFG response to ambient medium became 122nm, as shown in fig. 2. Compared with the LPFG without the polydiallyl dimethyl ammonium chloride/phytic acid nano film, the LPFG of the 50-layer polydiallyl dimethyl ammonium chloride/phytic acid nano film has 34nm increased response range to environmental media.
Example 2
(1) Immersing LPFG into concentrated sulfuric acid and hydrogen peroxide with the volume ratio of 7:3 for treatment at 80 ℃ for 1 hour;
(2) Washing LPFG with deionized water for 6 times, and drying with nitrogen;
(3) Straightening and fixing the LPFG on a liquid tank bracket;
(4) Adding polydiallyl dimethyl ammonium chloride containing sodium chloride into a liquid pool, and soaking for 20 minutes;
(5) Flushing the long-period grating for 6 times by using secondary deionized water, and drying by using nitrogen;
(6) Adding a phytic acid solution containing sodium chloride into a liquid pool for soaking for 10 minutes;
(7) Flushing the long-period grating for 6 times by using secondary deionized water, and drying by using nitrogen;
(8) The steps (4) - (7) were repeated 80 times.
In order to further optimize the technical scheme, the molecular weight of the polydiallyl dimethyl ammonium chloride is 5000-3000000;
In order to further optimize the technical scheme, the molar concentration ratio of sodium chloride to polydiallyl dimethyl ammonium chloride in the polydiallyl dimethyl ammonium chloride solution is between 0.05 and 300.
When 80 bilayer polydiallyl dimethyl ammonium chloride/phytic acid nanofilm was assembled, the maximum range of LPFG response to ambient medium became 157nm, as shown in fig. 3. Compared with the LPFG without the assembled polydiallyl dimethyl ammonium chloride/phytic acid nano film, the response range of the LPFG with the assembled 80 double-layer polydiallyl dimethyl ammonium chloride/phytic acid nano film to an environmental medium is increased by 69nm.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
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| 基于飞秒激光的长周期光纤光栅制备及其传感特性研究;苗飞;中国博士学位论文全文数据库信息科技辑;20121215;63-76 * |
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