CN111879691A - Atmospheric corrosivity monitoring device and method based on optical fiber surface plasma resonance - Google Patents
Atmospheric corrosivity monitoring device and method based on optical fiber surface plasma resonance Download PDFInfo
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Abstract
The invention provides an atmospheric corrosivity monitoring device and method based on optical fiber surface plasma resonance. The device of the invention comprises: the light source, the optical fiber sensor and the spectrum analyzer are sequentially connected through an optical fiber jumper; the optical fiber sensor is an optical fiber corrosion sensor based on surface plasma resonance and comprises a sensing optical fiber and a metal film, wherein a polishing area is arranged on one side of the outer surface of a sensing optical fiber cladding, and the metal film is plated on the polishing area; the external weak acid atmosphere corrodes the metal film to change the thickness of the metal film, the resonance wavelength of the optical fiber surface plasma resonance sensor can shift, the thickness change of the metal film and the shift of the resonance wavelength are in a linear relation in a certain metal film thickness range, the corrosion speed of the metal film is reflected by calculating the shift rate of the resonance wavelength, and the atmospheric corrosion detection is realized. The invention solves the problems of long detection period and incapability of real-time monitoring in the prior art, and has the advantages of high sensitivity and real-time monitoring.
Description
Technical Field
The invention relates to the technical field of optical sensors, in particular to an atmospheric corrosivity monitoring device and method based on optical fiber surface plasma resonance.
Background
Corrosion is the destruction and deterioration caused by the action of substances and environment, and is a process of substance material deterioration which is generally present in nature and difficult to avoid. The weak acid corrosive environment caused by air pollution is easily ignored by people. Such weak acid corrosion mainly threatens electronic equipment used in industrial process measurement and control, metal cultural relics in museums, books in libraries and the like. These substances, particularly metals (copper or silver), are particularly sensitive to the corrosive nature of the environment and can interfere with the proper operation of the electronic device. The composition of the atmospheric environment is complex, the concentration of acidic gas pollutants and physical factors such as temperature, humidity, illumination and the like generate synergistic effect, and the relationship between different environmental parameters and the corrosion rate of metal is very complex. It is very rigorous to evaluate the degree of atmospheric pollution based on defined environmental data. A reactivity monitoring method, namely direct corrosion evaluation, is used for evaluating the current atmospheric corrosion more reasonably and visually according to the corrosion rate of a metal sample. The corrosion rate of the metal sample can be calculated according to the thickness change of the metal before and after corrosion in unit time. The existing widely used corrosion test piece monitoring method has the defects of overlong monitoring period and incapability of realizing real-time monitoring of the thickness of the metal sampling piece.
The optical fiber sensor has the advantages of small volume, high sensitivity, electromagnetic interference resistance, corrosion resistance, quick response, reliability, stability, real-time monitoring and the like. The surface plasma resonance is a nonlinear optical phenomenon, when incident light is transmitted forwards in an optical fiber core through a total reflection phenomenon, electromagnetic waves can penetrate into a cladding layer to a certain thickness and then return into the optical fiber core to form evanescent waves, and the evanescent waves penetrating into a metal film can transfer light energy to free electrons to generate plasma. When the frequency of the surface plasma is consistent with that of the evanescent wave, the surface plasma and the evanescent wave resonate, so that the energy of reflected light in a resonant wave band is greatly attenuated, and the optical fiber transmission spectrum presents a resonance valley phenomenon. The generation of surface plasma resonance phenomenon and the change of resonance frequency are related to parameters such as refractive index of external medium of the metal film, thickness of the metal film and the like.
Disclosure of Invention
In view of the above-mentioned technical problems, an atmospheric corrosivity monitoring device and method based on fiber surface plasmon resonance are provided. The method mainly utilizes the relation between the thickness change of the metal film on the optical fiber sensor and the change of the resonance wavelength of the transmission spectrum to calculate the metal corrosion rate in unit time so as to evaluate the atmospheric corrosion strength, solves the problems that the prior art in the field has long detection period, low sensitivity and can not be monitored in real time, and has the advantages of high sensitivity and real-time monitoring.
The technical means adopted by the invention are as follows:
an atmospheric corrosivity monitoring device based on optical fiber surface plasmon resonance, comprising: the light source, the optical fiber sensor and the spectrum analyzer are sequentially connected through an optical fiber jumper; the optical fiber sensor is an optical fiber corrosion sensor based on surface plasma resonance, and comprises a sensing optical fiber and a metal film, wherein a polishing area is arranged on one side of the outer surface of a sensing optical fiber cladding, and the metal film is plated on the polishing area; the optical signal that the light source sent passes through the transmission of optic fibre jumper gets into optical fiber sensor's sensing fiber, the external environment medium in the environment surveyed can corrode metal film excites metal film's surface plasma resonance, and optical fiber sensor passes through the optic fibre jumper with the optical signal of the plasma resonance wave of containing of sensing fiber output and imports to the spectral analyser.
Further, the light source is a halogen light source capable of emitting light from visible light to infrared light, the wavelength range of an output signal is 400nm-1000nm, and the maximum output light power is 50 mW.
Further, the working wavelength range of the optical fiber spectrum analyzer is 300nm-1000 nm.
Further, the sensing optical fiber is a solid multimode optical fiber or a single-mode optical fiber, the diameter of the multimode optical fiber or the single-mode optical fiber is 125 μm, the diameter of the fiber core is 105 μm, a section of the optical fiber with the length of 20mm is selected to strip the coating layer, a rotating wheel type optical fiber polishing machine is used for performing side polishing, the side polishing length is 10mm, the polishing depth of the multimode optical fiber is 50 μm, and the polishing depth of the single-mode optical fiber is 58.5 μm.
Furthermore, the metal film is made of a metal material which can generate surface plasma resonance and is sensitive to an external environment medium, the thickness of the metal film is 30nm-60nm, and the film coating mode is a magnetron sputtering film coating method.
Furthermore, the external environment medium is atmosphere mixed with various pollutants, and the pH value is weakly acidic and corrosive.
The invention also provides an atmospheric corrosivity monitoring method based on the optical fiber surface plasma resonance, which comprises the following steps:
s1, placing the optical fiber sensor in a tested environment, and transmitting an optical signal sent by a light source into a sensing optical fiber of the optical fiber sensor through an optical fiber jumper;
s2, corroding the metal film by an external environment medium in the detected environment, exciting surface plasma resonance of the metal film, and inputting an optical signal containing plasma resonance waves output by the sensing optical fiber to the spectrum analyzer through the optical fiber jumper by the optical fiber sensor; in a signal spectrum observed by a spectrum analyzer, an obvious light intensity dip appears at a certain wavelength, namely the surface plasma resonance wavelength of the metal film;
s3, when the metal film is continuously corroded by the atmospheric environment, the thickness of the metal film is continuously reduced, the surface plasma resonance wavelength of the metal film drifts, the change of the surface plasma resonance wavelength of the metal film observed by the spectrum analyzer is recorded and analyzed, the change of the thickness of the metal film can be represented, and the current atmospheric environment pollution degree is evaluated by calculating the metal corrosion rate of the metal film in unit time.
Further, the spectral range of the light source covers the operating wavelength range of the optical fiber sensor; the working wavelength range of the optical spectrum analyzer covers the working wavelength range of the optical fiber sensor.
Further, step S1 includes spraying saturated sodium chloride on the metal film.
Compared with the prior art, the invention has the following advantages:
according to the atmospheric corrosion monitoring device based on optical fiber surface plasma resonance, the relationship between the thickness change of the metal film on the optical fiber sensor and the change of the resonance wavelength of the transmission spectrum is utilized, the metal corrosion rate in unit time is calculated to evaluate the atmospheric corrosion strength, the problems that the detection period is long, the sensitivity is low and real-time monitoring cannot be achieved in the prior art are solved, and the atmospheric corrosion monitoring device based on optical fiber surface plasma resonance has the advantages of being high in sensitivity and capable of achieving real-time monitoring.
For the above reasons, the present invention can be widely applied to the fields of optical sensors and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a device for monitoring atmospheric corrosivity based on fiber surface plasmon resonance.
FIG. 2 is a schematic structural diagram of an optical fiber sensor according to the present invention
In the figure: 1. a sensing optical fiber; 2. a metal thin film; 3. a light source; 4. a measured environment; 5. an optical fiber jumper; 6. and (4) a spectrum analyzer.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The embodiments of the present invention will be described in detail with reference to the accompanying drawings.
An atmospheric corrosivity monitoring device based on optical fiber surface plasmon resonance is shown in fig. 1, and comprises: the light source 3, the optical fiber sensor and the spectrum analyzer 6 are connected in sequence through an optical fiber jumper 5; as shown in fig. 2, the optical fiber sensor is an optical fiber corrosion sensor based on surface plasmon resonance, and includes a sensing optical fiber 1 and a metal film 2, wherein a polishing area is disposed on one side of the outer surface of the cladding of the sensing optical fiber 1, and the metal film 2 is plated on the polishing area; the optical signal sent by the light source 3 is transmitted into the sensing optical fiber 1 of the optical fiber sensor through the optical fiber jumper 5, an external environment medium in the detected environment 4 can corrode the metal film 2, the surface plasma resonance of the metal film 2 is excited, and the optical fiber sensor inputs the optical signal containing the plasma resonance wave output by the sensing optical fiber 1 into the optical spectrum analyzer 6 through the optical fiber jumper 5.
In specific implementation, preferably, the light source 3 is a halogen light source capable of emitting light in a wavelength range from visible light to infrared light, the wavelength range of the output signal is 400nm-1000nm, and the maximum output optical power is 50 mW. The working wavelength range of the optical fiber spectrum analyzer is 300nm-1000 nm.
In this embodiment, the sensing fiber 1 is a solid multimode fiber or single-mode fiber, the diameter of the multimode fiber or single-mode fiber is 125 μm, the diameter of the fiber core is 105 μm, a section of the fiber with a length of 20mm is selected to strip the coating layer, a runner-type fiber polishing machine is used to perform side polishing, the side polishing length is 10mm, the polishing depth of the multimode fiber is 50 μm, and the polishing depth of the single-mode fiber is 58.5 μm. The metal film 2 is made of a metal material which can generate surface plasma resonance and is sensitive to an external environment medium, the thickness of the metal film 2 is 30nm-60nm, and the film coating mode is a magnetron sputtering film coating method. The external environment medium is atmosphere mixed with various pollutants, and the pH value is weakly acidic and corrosive.
The working principle of the atmospheric corrosivity monitoring device based on the optical fiber surface plasma resonance provided by the invention is as follows: the thickness change of the metal film 2 on the optical fiber sensor is related to the change of the resonance wavelength of the transmission spectrum, and the faintly acid atmosphere with the corrosion effect can corrode the metal film 2 on the sensing optical fiber due to the stable refractive index of the faintly acid atmosphere formed by multiple components, so that the thickness of the metal film 2 is changed, and the surface plasma resonance wavelength of the metal film 2 is changed. Within the range of 30nm-60nm of the thickness of the metal film 2, the surface plasma resonance wavelength of the metal film 2 shows a linear variation trend along with the thickness of the metal film, and the metal corrosion rate in unit time is calculated to evaluate the atmospheric corrosion strength.
The embodiment of the application also discloses an atmospheric corrosivity monitoring method based on the optical fiber surface plasma resonance, which comprises the following steps:
s1, the optical fiber sensor is placed in a detected environment 4, because the actual atmospheric environment has complex components and slow corrosion process, the optical fiber sensor can be placed in a sealed air chamber, saturated sodium chloride is sprayed on the metal film 2 of the optical fiber sensor to accelerate corrosion, and an optical signal sent by the light source 3 is transmitted into the sensing optical fiber 1 of the optical fiber sensor through the optical fiber jumper 5;
s2, an external environment medium in the detected environment 4 corrodes the metal film 2, surface plasma resonance of the metal film 2 is excited, and an optical fiber sensor inputs an optical signal containing plasma resonance waves output by the sensing optical fiber 1 to the spectrum analyzer 6 through the optical fiber jumper 5; in a signal spectrum observed by the spectrum analyzer 6, an obvious light intensity dip appears at a certain wavelength, namely the surface plasma resonance wavelength of the metal film 2;
s3, when the metal film 2 is continuously corroded by the atmospheric environment, the thickness of the metal film 2 is continuously reduced, the surface plasma resonance wavelength of the metal film 2 drifts, the change of the surface plasma resonance wavelength of the metal film 2 observed by the optical spectrum analyzer 6 is recorded and analyzed, the change of the thickness of the metal film 2 can be represented, and the current atmospheric environment pollution degree is evaluated by calculating the metal corrosion rate of the metal film 2 in unit time.
In specific implementation, the spectral range of the light source 3 covers the working wavelength range of the optical fiber sensor; the spectrum analyzer 6 has an operating wavelength range covering the operating wavelength range of the optical fiber sensor.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. An atmospheric corrosivity monitoring device based on optical fiber surface plasmon resonance, comprising: the light source, the optical fiber sensor and the spectrum analyzer are sequentially connected through an optical fiber jumper; the optical fiber sensor is an optical fiber corrosion sensor based on surface plasma resonance, and comprises a sensing optical fiber and a metal film, wherein a polishing area is arranged on one side of the outer surface of a sensing optical fiber cladding, and the metal film is plated on the polishing area; the optical signal that the light source sent passes through the transmission of optic fibre jumper gets into optical fiber sensor's sensing fiber, the external environment medium in the environment surveyed can corrode metal film excites metal film's surface plasma resonance, and optical fiber sensor passes through the optic fibre jumper with the optical signal of the plasma resonance wave of containing of sensing fiber output and imports to the spectral analyser.
2. The atmospheric corrosivity monitoring device based on optical fiber surface plasmon resonance of claim 1, wherein the light source is a halogen light source capable of emitting light from visible light to infrared light, the output signal wavelength range is 400nm-1000nm, and the maximum output optical power is 50 mW.
3. The atmospheric corrosivity monitoring device based on fiber surface plasmon resonance of claim 1, wherein the operating wavelength range of the fiber optical spectrum analyzer is 300nm-1000 nm.
4. The atmospheric corrosivity monitoring device based on fiber surface plasmon resonance of claim 1, wherein the sensing fiber is a solid multimode fiber or single-mode fiber, the diameter of the multimode fiber or single-mode fiber is 125 μm, the diameter of the fiber core is 105 μm, a section of the stripping coating layer 20mm long in the middle of the fiber is selected, a runner type fiber polishing machine is used for performing side polishing, the polishing length of the side polishing is 10mm, the polishing depth of the multimode fiber is 50 μm, and the polishing depth of the single-mode fiber is 58.5 μm.
5. The atmospheric corrosivity monitoring device based on optical fiber surface plasmon resonance as claimed in claim 1, wherein the metal thin film is made of a metal material which can generate surface plasmon resonance and is sensitive to an external environment medium, the thickness of the metal thin film is 30nm-60nm, and the coating mode is magnetron sputtering coating.
6. The atmospheric corrosivity monitoring device based on optical fiber surface plasmon resonance of claim 5, wherein the external environment medium is an atmosphere mixed with a plurality of pollutants, and the pH value is weakly acidic and corrosive.
7. An atmospheric corrosivity monitoring method based on optical fiber surface plasmon resonance and realized on the basis of the device of claim 1, characterized by comprising the following steps:
s1, placing the optical fiber sensor in a tested environment, and transmitting an optical signal sent by a light source into a sensing optical fiber of the optical fiber sensor through an optical fiber jumper;
s2, corroding the metal film by an external environment medium in the detected environment, exciting surface plasma resonance of the metal film, and inputting an optical signal containing plasma resonance waves output by the sensing optical fiber to the spectrum analyzer through the optical fiber jumper by the optical fiber sensor; in a signal spectrum observed by a spectrum analyzer, an obvious light intensity dip appears at a certain wavelength, namely the surface plasma resonance wavelength of the metal film;
s3, when the metal film is continuously corroded by the atmospheric environment, the thickness of the metal film is continuously reduced, the surface plasma resonance wavelength of the metal film drifts, the change of the surface plasma resonance wavelength of the metal film observed by the spectrum analyzer is recorded and analyzed, the change of the thickness of the metal film can be represented, and the current atmospheric environment pollution degree is evaluated by calculating the metal corrosion rate of the metal film in unit time.
8. The atmospheric corrosivity monitoring method based on fiber surface plasmon resonance of claim 7, wherein the spectral range of the light source covers the operating wavelength range of the fiber sensor; the working wavelength range of the optical spectrum analyzer covers the working wavelength range of the optical fiber sensor.
9. The method for monitoring atmospheric corrosivity based on fiber surface plasmon resonance of claim 7, wherein step S1 further comprises spraying saturated sodium chloride on the metal film.
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| CN202010761509.3A CN111879691A (en) | 2020-07-31 | 2020-07-31 | Atmospheric corrosivity monitoring device and method based on optical fiber surface plasma resonance |
| AU2021211978A AU2021211978B2 (en) | 2020-07-31 | 2021-08-02 | Atmospheric corrosion monitoring device and method based on optical fiber surface plasmon resonance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117147481A (en) * | 2023-09-01 | 2023-12-01 | 重庆市特种设备检测研究院 | Infrared optical fiber spectrum sensor for detecting rust of elevator steel wire rope |
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