CN112577918A - Optical fiber sensor simulation method based on evanescent wave principle - Google Patents
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004088 simulation Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 72
- 238000001228 spectrum Methods 0.000 claims abstract description 51
- 230000005540 biological transmission Effects 0.000 claims abstract description 34
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 19
- 238000004364 calculation method Methods 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims description 16
- 230000008033 biological extinction Effects 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 230000031700 light absorption Effects 0.000 claims description 8
- 230000005684 electric field Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 3
- 239000000975 dye Substances 0.000 abstract description 41
- 238000013461 design Methods 0.000 abstract description 5
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 5
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 5
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- 230000003287 optical effect Effects 0.000 description 1
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Abstract
An optical fiber sensor simulation method based on evanescent wave principle is based on the field of sensor simulation, and comprises the steps of calculating complex refractive index spectra of materials of sensor indicator dyes under different wavelengths, then determining a finite element model of a sensor structure, setting material thickness, loading the complex refractive index spectra of the materials into a sensor sensing interval, obtaining a light intensity transmission ratio spectrum of the optical fiber sensor through simulation calculation, finally converting the light intensity transmission ratio spectrum of the optical fiber sensor into an absorbance spectrum of the optical fiber sensor, judging whether innovation of the indicator dyes is reasonable or not, greatly reducing design cost and having important guiding significance for designing the indicator dyes.
Description
Technical Field
The invention relates to the field of sensor simulation, in particular to an optical fiber sensor simulation method based on an evanescent wave principle.
Background
At present, in the industry, the function and performance verification of the optical fiber sensor based on the evanescent wave principle is basically performed in a laboratory after being processed and manufactured, and generally, the innovation of the optical fiber sensor based on the evanescent wave principle mainly has the following three aspects:
firstly, the absorption of the material to light in the transmission process is increased by changing the structure of the sensor, such as changing a straight probe into a U-shaped probe;
secondly, a new indicator dye is adopted to react with the measured object, so that the propagation loss of light with different wave bands is caused;
third, improvements to the gel-sol process technology.
The simulation of the optical fiber sensor based on the evanescent wave principle is not applied to engineering, and actually, whether the innovation of the structure and the indicator dye is reasonable or not can be verified before actual processing through a simulation technology, so that the design cost is greatly reduced, and the simulation method has great significance for engineering projects.
Disclosure of Invention
The invention aims to: the method comprises the steps of calculating the complex refractive index spectrum of a material of a sensor indicator dye under different optical wavelengths, then determining a finite element model of a sensor structure, setting the thickness of the material, loading the complex refractive index spectrum of the material into a sensor sensing interval, obtaining a light intensity transmission ratio spectrum of the optical fiber sensor through simulation calculation, finally converting the light intensity transmission ratio spectrum of the optical fiber sensor into an absorbance spectrum of the optical fiber sensor, judging whether the innovation of the indicator dye is reasonable or not, and solving the problems.
The technical scheme adopted by the invention is as follows:
an optical fiber sensor simulation method based on evanescent wave principle comprises the following steps:
step 1: calculating complex refractive index spectra of materials of the sensor indicator dye at different wavelengths of light;
step 2: determining a finite element model of a sensor structure, setting the material thickness of a sensor indicator dye and loading the complex refractive index spectrum of the material into a sensor sensing interval;
and step 3: carrying out simulation calculation to obtain a light intensity transmission ratio spectrum of the optical fiber sensor;
and 4, step 4: and converting the light intensity transmission ratio spectrum of the optical fiber sensor into an absorbance spectrum of the optical fiber sensor.
To better implement the present solution, further, the step S1 calculates the complex refractive index spectrum of the indicator dye material at different wavelengths of light, including calculating the real part and the imaginary part of the complex refractive index, where the complex refractive index is expressed as:
N＝n-ik
where N is the complex refractive index of the indicator dye material, N is the real part of the complex refractive index, and k is the imaginary part of the complex refractive index.
To better implement this solution, further, the real part of the complex refractive index spectrum of the material of the indicator dye is calculated as: according to the total reflection condition, after the incident angle of the simulated incident light is assumed, the n is the basis1sinθiN estimates the real part value of the complex refractive index, where n1Is the core refractive index, θiIs the angle of incidence of the incident light.
To better implement the solution, further the imaginary part of the complex refractive index spectrum of the material of the indicator dye is calculated as: calculating the spectrum of the corresponding wavelength of the absorption coefficient of the material through the actual absorbance spectrum of the indicator dye material, specifically as follows:
wherein alpha is the light absorption coefficient of the material, A is the light absorption rate of the material, and t is the thickness of the material;
and then, calculating the extinction coefficient of the indicator dye material through the absorption coefficient of the indicator dye material, wherein the extinction coefficient is specifically as follows:
where k is the extinction coefficient of the material, i.e., the imaginary part of the complex refractive index of the material, f is the frequency of light, and c is the transmission speed of light in vacuum.
In order to better implement the scheme, further, the method for determining the transmission depth of the evanescent wave comprises the following steps:
where δ is the transmission depth of the evanescent wave and λ is the wavelength of the light.
In order to better implement the present solution, further, the method for obtaining the light intensity transmission ratio T of the optical fiber sensor through simulation calculation includes:
wherein, P0For the incident power of light entering the fiber sensor, Pxσ is the conductivity of the solid for the output power of the light passing out of the fiber optic sensor, E0For the incident electric field intensity of the light entering the fiber optic sensor, ExThe electric field strength of the light exiting the fiber optic sensor; e0And ExThe relationship of (1) is:
where x is the length of the fiber optic sensor.
In order to better implement the scheme, further, the method for converting the light intensity transmission ratio T spectrum of the optical fiber sensor into the light absorbance A of the optical fiber sensor comprises the following steps: log of A ═ log10(T)。
The simulation method of the optical fiber sensor based on the evanescent wave principle can simulate the absorption spectrum of the optical fiber sensor from two aspects of the structure of the optical fiber sensor and the dye material of the indicator to verify the function and the performance of the optical fiber sensor based on the evanescent wave principle.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention relates to an optical fiber sensor simulation method based on evanescent wave principle, which comprises the steps of calculating complex refractive index spectra of materials of sensor indicator dyes under different wavelengths of light, then determining a finite element model of a sensor structure, setting the thickness of the materials, loading the complex refractive index spectra of the materials into a sensor sensing interval, obtaining a light intensity transmission ratio spectrum of the optical fiber sensor through simulation calculation, finally converting the light intensity transmission ratio spectrum of the optical fiber sensor into an absorbance spectrum of the optical fiber sensor, and judging whether the innovation of the indicator dyes is reasonable or not, thereby greatly reducing the design cost;
2. the invention relates to an optical fiber sensor simulation method based on evanescent wave principle, which comprises the steps of calculating complex refractive index spectra of materials of sensor indicator dyes under different wavelengths of light, then determining a finite element model of a sensor structure, setting the thickness of the materials, loading the complex refractive index spectra of the materials into a sensor sensing interval, obtaining a light intensity transmission ratio spectrum of the optical fiber sensor through simulation calculation, finally converting the light intensity transmission ratio spectrum of the optical fiber sensor into an absorbance spectrum of the optical fiber sensor, judging whether the innovation of the indicator dyes is reasonable or not, and having important guiding significance for designing the indicator dyes;
3. the invention relates to an optical fiber sensor simulation method based on evanescent wave principle, which comprises the steps of calculating complex refractive index spectra of materials of sensor indicator dyes under different wavelengths of light, then determining a finite element model of a sensor structure, setting the thickness of the materials, loading the complex refractive index spectra of the materials into a sensor sensing interval, obtaining a light intensity transmission ratio spectrum of the optical fiber sensor through simulation calculation, finally converting the light intensity transmission ratio spectrum of the optical fiber sensor into an absorbance spectrum of the optical fiber sensor, judging whether the innovation of the indicator dyes is reasonable or not, and avoiding material waste caused by multiple entity measurement.
Drawings
In order to more clearly illustrate the technical solution, the drawings needed to be used in the embodiments are briefly described below, and it should be understood that, for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts, wherein:
FIG. 1 is a block diagram of the method steps of the present invention;
FIG. 2 is a graph of the actual absorbance spectrum of TSPP according to the present invention in a pH 5 solution;
FIG. 3 is a simulated absorbance spectrum of a TSPP dye of the present invention when used as a fiber optic indicator.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, 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 should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and therefore should not be considered as a limitation to the scope of protection. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The present invention will be described in detail with reference to fig. 1 to 3.
Example 1
An optical fiber sensor simulation method based on evanescent wave principle, as shown in fig. 1, includes the following steps:
step 1: calculating complex refractive index spectra of materials of the sensor indicator dye at different wavelengths of light;
step 2: determining a finite element model of a sensor structure, setting the material thickness of a sensor indicator dye and loading the complex refractive index spectrum of the material into a sensor sensing interval;
and step 3: carrying out simulation calculation to obtain a light intensity transmission ratio spectrum of the optical fiber sensor;
and 4, step 4: and converting the light intensity transmission ratio spectrum of the optical fiber sensor into an absorbance spectrum of the optical fiber sensor.
The working principle is as follows: the simulation method of the optical fiber sensor based on the evanescent wave principle can simulate the absorption spectrum of the optical fiber sensor from two aspects of the structure of the optical fiber sensor and the dye material of the indicator to verify the function and the performance of the optical fiber sensor based on the evanescent wave principle.
Example 2
An optical fiber sensor simulation method based on evanescent wave principle, as shown in fig. 1, includes the following steps:
step 1: calculating complex refractive index spectra of materials of the sensor indicator dye at different wavelengths of light;
step 2: determining a finite element model of a sensor structure, setting the material thickness of a sensor indicator dye and loading the complex refractive index spectrum of the material into a sensor sensing interval;
and step 3: carrying out simulation calculation to obtain a light intensity transmission ratio spectrum of the optical fiber sensor;
and 4, step 4: and converting the light intensity transmission ratio spectrum of the optical fiber sensor into an absorbance spectrum of the optical fiber sensor.
Wherein said step S1 calculates the complex refractive index spectrum of the indicator dye material at different wavelengths of light, including calculating the real and imaginary parts of the complex refractive index, the complex refractive index being expressed as:
N＝n-ik
where N is the complex refractive index of the indicator dye material, N is the real part of the complex refractive index, and k is the imaginary part of the complex refractive index.
In step S1, the real part of the material complex refractive index spectrum of the indicator dye is calculated as: according to the total reflection condition, after the incident angle of the simulated incident light is assumed, the n is the basis1sinθiN estimates the real part value of the complex refractive index, where n1Is the core refractive index, θiIs incident lightThe angle of incidence of the line.
In step S1, the imaginary part of the material complex index spectrum of the indicator dye is calculated as: calculating the spectrum of the corresponding wavelength of the absorption coefficient of the material through the actual absorbance spectrum of the indicator dye material, specifically as follows:
wherein alpha is the light absorption coefficient of the material, A is the light absorption rate of the material, and t is the thickness of the material;
and then, calculating the extinction coefficient of the indicator dye material through the absorption coefficient of the indicator dye material, wherein the extinction coefficient is specifically as follows:
where k is the extinction coefficient of the material, i.e., the imaginary part of the complex refractive index of the material, f is the frequency of light, and c is the transmission speed of light in vacuum.
In step S2, the method for determining the transmission depth of the evanescent wave includes:
where δ is the transmission depth of the evanescent wave and λ is the wavelength of the light.
In step S3, the method for obtaining the light intensity transmission ratio T of the optical fiber sensor through simulation calculation includes:
wherein, P0For the incident power of light entering the fiber sensor, Pxσ is the conductivity of the solid for the output power of the light passing out of the fiber optic sensor, E0For the incident electric field intensity of the light entering the fiber optic sensor, ExTo be injected outThe electric field strength of the light of the optical fiber sensor; e0And ExThe relationship of (1) is:
where x is the length of the fiber optic sensor.
The method for converting the light intensity transmission ratio T spectrum of the optical fiber sensor into the light absorption rate A of the optical fiber sensor comprises the following steps: log of A ═ log10(T)。
The working principle is as follows: the simulation method of the optical fiber sensor based on the evanescent wave principle can simulate the absorption spectrum of the optical fiber sensor from two aspects of the structure of the optical fiber sensor and the dye material of the indicator to verify the function and the performance of the optical fiber sensor based on the evanescent wave principle.
Other parts of this embodiment are the same as those of embodiment 1, and thus are not described again.
Example 3
This embodiment is based on the technical solutions of embodiment 1 or embodiment 2, as shown in fig. 2 and fig. 3, an optical fiber sensor is taken as an example, the optical fiber sensor is based on the evanescent wave principle and is used for detecting pH solutions, and the indicator dye is a TSPP material.
Fig. 2 is an actual absorbance spectrum of TSPP in pH-5 solution. FIG. 3 is an absorbance spectrum simulated using a TSPP dye as the fiber indicator.
Comparing fig. 2 and fig. 3, it can be seen that, in the simulation result, the overall trend of the absorbance along with the wavelength change is consistent with the actual trend, the position of the absorption peak is consistent with the overall trend, and two peaks appear at the positions of about 440nm and 640nm, respectively. The simulation and the actual performance are good, the actual result can be reflected, the design indicator dye has important guiding significance, and the forward design can be guided.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (7)
1. An optical fiber sensor simulation method based on evanescent wave principle is characterized by comprising the following steps:
step 1: calculating complex refractive index spectra of materials of the sensor indicator dye at different wavelengths of light;
step 2: determining a finite element model of a sensor structure, setting the material thickness of a sensor indicator dye and loading the complex refractive index spectrum of the material into a sensor sensing interval;
and step 3: carrying out simulation calculation to obtain a light intensity transmission ratio spectrum of the optical fiber sensor;
and 4, step 4: and converting the light intensity transmission ratio spectrum of the optical fiber sensor into an absorbance spectrum of the optical fiber sensor.
2. The method for simulating an optical fiber sensor based on the evanescent wave principle as claimed in claim 1, wherein: said step S1 calculating a complex refractive index spectrum of the indicator dye material at different wavelengths of light includes calculating the real and imaginary parts of the complex refractive index, the complex refractive index being expressed as:
N＝n-ik
where N is the complex refractive index of the indicator dye material, N is the real part of the complex refractive index, and k is the imaginary part of the complex refractive index.
3. The method for simulating an optical fiber sensor based on the evanescent wave principle as claimed in claim 2, wherein: the real part of the material complex refractive index spectrum of the indicator dye is calculated as: according to the total reflection condition, after the incident angle of the simulated incident light is assumed, the n is the basis1sinθiN estimates the real part value of the complex refractive index, where n1Is the core refractive index, θiIs incident lightAngle of incidence.
4. A method for simulating an optical fiber sensor based on the evanescent wave principle as claimed in claim 2 or 3, wherein: the imaginary part of the material complex index spectrum of the indicator dye is calculated as: calculating the spectrum of the corresponding wavelength of the absorption coefficient of the material through the actual absorbance spectrum of the indicator dye material, specifically as follows:
wherein alpha is the light absorption coefficient of the material, A is the light absorption rate of the material, and t is the thickness of the material;
and then, calculating the extinction coefficient of the indicator dye material through the absorption coefficient of the indicator dye material, wherein the extinction coefficient is specifically as follows:
where k is the extinction coefficient of the material, i.e., the imaginary part of the complex refractive index of the material, f is the frequency of light, and c is the transmission speed of light in vacuum.
5. The method for simulating an optical fiber sensor based on the evanescent wave principle as claimed in claim 1, wherein: the method for determining the transmission depth of the evanescent wave comprises the following steps:
where δ is the transmission depth of the evanescent wave and λ is the wavelength of the light.
6. The method for simulating an optical fiber sensor based on the evanescent wave principle as claimed in claim 1, wherein: the method for obtaining the light intensity transmission ratio T of the optical fiber sensor through simulation calculation comprises the following steps:
wherein, P0For the incident power of light entering the fiber sensor, Pxσ is the conductivity of the solid for the output power of the light passing out of the fiber optic sensor, E0For the incident electric field intensity of the light entering the fiber optic sensor, ExThe electric field strength of the light exiting the fiber optic sensor; e0And ExThe relationship of (1) is:
where x is the length of the fiber optic sensor.
7. The method for simulating an optical fiber sensor based on the evanescent wave principle as claimed in claim 1, wherein: the method for converting the light intensity transmission ratio T spectrum of the optical fiber sensor into the light absorption rate A of the optical fiber sensor comprises the following steps: log of A ═ log10(T)。
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|---|---|---|---|---|
| CN1712930A (en) * | 2005-07-01 | 2005-12-28 | 重庆工学院 | Interference evanescent wave chemical and biological sensor and system with fibre-optical Michelson |
| CN102607610A (en) * | 2012-03-12 | 2012-07-25 | 天津理工大学 | Terahertz porous fiber evanescent wave sensing device |
| CN103868457A (en) * | 2014-03-03 | 2014-06-18 | 中国计量学院 | Surface plasma resonance-based optical fiber multipoint micro displacement sensing method and device |
| CN104568764A (en) * | 2015-01-28 | 2015-04-29 | 哈尔滨工业大学 | Optical fiber evanescent wave form quartz enhanced photoacoustic spectrum sensor and gas measurement method |
| CN107300537A (en) * | 2017-06-12 | 2017-10-27 | 电子科技大学 | Graphene complex refractivity index measuring method based on LPFG spectrum |
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- 2020-12-29 CN CN202011597538.7A patent/CN112577918A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1712930A (en) * | 2005-07-01 | 2005-12-28 | 重庆工学院 | Interference evanescent wave chemical and biological sensor and system with fibre-optical Michelson |
| CN102607610A (en) * | 2012-03-12 | 2012-07-25 | 天津理工大学 | Terahertz porous fiber evanescent wave sensing device |
| CN103868457A (en) * | 2014-03-03 | 2014-06-18 | 中国计量学院 | Surface plasma resonance-based optical fiber multipoint micro displacement sensing method and device |
| CN104568764A (en) * | 2015-01-28 | 2015-04-29 | 哈尔滨工业大学 | Optical fiber evanescent wave form quartz enhanced photoacoustic spectrum sensor and gas measurement method |
| CN107300537A (en) * | 2017-06-12 | 2017-10-27 | 电子科技大学 | Graphene complex refractivity index measuring method based on LPFG spectrum |
Non-Patent Citations (1)
| Title |
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| 李立伟: "锥形光纤倏逝场液体传感器的研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》, no. 10, 15 October 2012 (2012-10-15), pages 30 - 42 * |
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