CN111257283A - Refractive index sensing measurement device and method - Google Patents
Refractive index sensing measurement device and method Download PDFInfo
- Publication number
- CN111257283A CN111257283A CN202010115101.9A CN202010115101A CN111257283A CN 111257283 A CN111257283 A CN 111257283A CN 202010115101 A CN202010115101 A CN 202010115101A CN 111257283 A CN111257283 A CN 111257283A
- Authority
- CN
- China
- Prior art keywords
- bragg
- optical fiber
- refractive index
- fiber grating
- transmission peak
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a refractive index sensing and measuring device and a method, wherein the device comprises: the optical fiber grating corrosion detection device comprises a corrosion Bragg fiber grating FP interferometer, a matching Bragg fiber grating, an optical amplifier, an optical fiber circulator, an optical fiber coupler, a photoelectric detector and a spectrum analyzer, wherein optical signals sent by the optical amplifier are input into the optical fiber circulator and the matching Bragg fiber grating, the narrow-band transmission peak wavelength of the corrosion Bragg fiber grating FP interferometer is reflected by the matching Bragg fiber grating, the reflected narrow-band transmission peak wavelength is transmitted to the optical fiber coupler to form laser, the laser is output by the optical fiber coupler, the laser is subjected to frequency beating by the photoelectric detector to generate microwave signal frequency, and the microwave signal frequency is measured by the spectrum analyzer so as to obtain the refractive index of a solution to be detected according to the microwave signal frequency and a pre-drawn relation curve, so that the sensitivity and the resolution of sensing are greatly improved.
Description
Technical Field
The invention relates to the technical field of photoelectron, in particular to a refractive index sensing and measuring device and a refractive index sensing and measuring method.
Background
In the related art, the optical fiber sensor has the characteristics of small volume, light weight, easy realization of remote and distributed measurement, explosion prevention, electric insulation, electromagnetic interference prevention and the like, and is widely applied to the field of remote measurement of parameters such as refractive index, temperature, stress and the like.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, the first objective of the present invention is to provide a refractive index sensing measurement device, which uses the etched bragg fiber grating FP interferometer to measure the refractive index, thereby greatly improving the sensitivity and resolution of sensing.
The second purpose of the invention is to provide a measuring method based on refractive index sensing.
In order to achieve the above object, a first embodiment of the present invention provides a refractive index sensing measurement apparatus, which includes an etched bragg fiber grating (FP) interferometer, a matched bragg fiber grating, an optical amplifier, an optical fiber circulator, an optical fiber coupler, a photodetector and a spectrometer, wherein an optical signal sent by the optical amplifier is input to the optical fiber circulator and the matched bragg fiber grating, and is reflected by the matched bragg fiber grating, so as to transmit a narrow-band transmission peak wavelength of the etched bragg fiber grating (FP) interferometer to the optical fiber coupler to form laser light, and output the laser light through a first output end of the optical fiber coupler, the photodetector beats the laser light to generate a microwave signal frequency, and measures the microwave signal frequency through the spectrometer, so as to obtain the refractive index of the solution to be measured according to the microwave signal frequency and a pre-drawn relation curve.
The refractive index sensing and measuring device provided by the embodiment of the invention comprises an etched Bragg fiber grating FP interferometer, a matched Bragg fiber grating, an optical amplifier, an optical fiber circulator, an optical fiber coupler, a photoelectric detector and a frequency spectrograph, wherein an optical signal sent by the optical amplifier is input into the optical fiber circulator and the matched Bragg fiber grating, and the narrow-band transmission peak wavelength of the corrosion Bragg fiber grating FP interferometer is reflected by matching the Bragg fiber grating, transmitting the reflected narrow-band transmission peak wavelength to the optical fiber coupler to form laser, outputting the laser through the first output end of the optical fiber coupler, beating the laser by the photoelectric detector, generating microwave signal frequency, and measuring the microwave signal frequency through a frequency spectrograph so as to obtain the refractive index of the solution to be measured according to the microwave signal frequency and a pre-drawn relation curve; therefore, the corrosion Bragg fiber grating FP interferometer has the spectral characteristics of two narrow-band transmission peaks, and is used as a wavelength selection device of a dual-wavelength fiber laser and a refractive index sensing device; when the external refractive index is changed, the optical path difference between two gratings of the corrosion Bragg fiber grating FP interferometer is changed, so that the wavelength interval of a transmission peak is changed, and the wavelength interval of the dual-wavelength fiber laser is changed; and then, a photoelectric detector is adopted to beat frequency of the output laser, and the refractive index of the liquid to be detected can be obtained by measuring the change of the frequency of a microwave signal generated by the beat frequency, so that the signal-to-noise ratio and the resolution of the refractive index sensing and measuring device are not limited by bandwidth, and the sensitivity and the resolution of sensing are greatly improved.
In addition, the refractive index sensing and measuring device provided according to the above embodiment of the present invention may further have the following additional technical features:
optionally, the narrowband transmission peak wavelength includes a first narrowband transmission peak wavelength and a second narrowband transmission peak wavelength, and both the first narrowband transmission peak wavelength and the second narrowband transmission peak wavelength are located in a reflection band of the matched bragg fiber grating.
Optionally, the optical amplifier is a semiconductor optical amplifier, an input end of the semiconductor optical amplifier is connected to the second output end of the optical fiber coupler, an output end of the semiconductor optical amplifier is connected to an input end of the optical fiber circulator, a reflection end of the optical fiber circulator is connected to the matched bragg fiber grating, an output end of the optical fiber circulator is connected to one end of the corrosion bragg fiber grating FP interferometer, the other end of the corrosion bragg fiber grating FP interferometer is connected to an input end of the optical fiber coupler, a first output end of the optical fiber coupler is optically connected to an input end of the photodetector, and an output end of the photodetector is electrically connected to an input end of the spectrometer.
Optionally, the optical fiber coupler is a 90:10 optical fiber coupler, the first output port of the optical fiber coupler is a 10% output port, and the second output port of the optical fiber coupler is a 90% output port.
In order to achieve the above object, a second embodiment of the present invention provides a refractive index sensing measurement method, including the following steps: placing the corrosion Bragg fiber grating FP interferometer into a solution to be tested; opening a switch of a semiconductor optical amplifier so that an optical signal sent by the semiconductor optical amplifier is input to an optical fiber circulator and a matched Bragg optical fiber grating, and reflecting a narrow-band transmission peak wavelength of a corrosion Bragg optical fiber grating (FP) interferometer through the matched Bragg optical fiber grating so as to transmit the reflected narrow-band transmission peak wavelength to an optical fiber coupler to form laser; beating the laser through a photoelectric detector to generate a microwave signal frequency, and measuring the microwave signal frequency through a frequency spectrograph; and obtaining the refractive index of the solution to be detected according to the microwave signal frequency and a pre-drawn relation curve.
According to the refractive index sensing measurement method provided by the embodiment of the invention, firstly, a corrosion Bragg fiber grating FP interferometer is placed in a solution to be measured; then, a switch of the semiconductor optical amplifier is opened so that an optical signal sent by the semiconductor optical amplifier is input to the optical fiber circulator and the matched Bragg optical fiber grating, and the narrow-band transmission peak wavelength of the corrosion Bragg optical fiber grating FP interferometer is reflected by the matched Bragg optical fiber grating so as to transmit the reflected narrow-band transmission peak wavelength to the optical fiber coupler to form laser; then, beating the laser through a photoelectric detector to generate a microwave signal frequency, and measuring the microwave signal frequency through a frequency spectrograph; finally, obtaining the refractive index of the solution to be measured according to the microwave signal frequency and a pre-drawn relation curve; therefore, the refractive index sensing and measuring device is adopted for refractive index measurement, so that the sensitivity and the resolution of sensing are greatly improved.
In addition, the refractive index sensing measurement method proposed according to the above embodiment of the present invention may further have the following additional technical features:
optionally, before placing the corrosion fiber bragg grating FP interferometer into a solution to be measured, the following steps are further included: placing the corroded Bragg fiber grating FP interferometer into a pre-prepared solution with a known refractive index; opening a switch of a semiconductor optical amplifier so that an optical signal sent by the semiconductor optical amplifier is input to an optical fiber circulator and a matched Bragg optical fiber grating, and reflecting a narrow-band transmission peak wavelength of a corrosion Bragg optical fiber grating (FP) interferometer through the matched Bragg optical fiber grating so as to transmit the reflected narrow-band transmission peak wavelength to an optical fiber coupler to form laser; beating the laser through a photoelectric detector to generate a microwave signal frequency, and measuring the microwave signal frequency through a frequency spectrograph; and drawing a relation curve according to the microwave signal frequency and the known solution refractive index.
Optionally, the narrowband transmission peak wavelength includes a first narrowband transmission peak wavelength and a second narrowband transmission peak wavelength, and both the first narrowband transmission peak wavelength and the second narrowband transmission peak wavelength are located in a reflection band of the matched bragg fiber grating.
Optionally, the optical fiber coupler is a 90:10 optical fiber coupler, the first output port of the optical fiber coupler is a 10% output port, and the second output port of the optical fiber coupler is a 90% output port.
Drawings
FIG. 1 is a schematic diagram of a refractive index sensing measurement apparatus according to one embodiment of the present invention;
FIG. 2 is a schematic flow chart of a refractive index sensing measurement method according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for plotting a relationship curve according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Fig. 1 is a schematic structural view of a refractive index sensing measuring apparatus according to an embodiment of the present invention, as shown in fig. 1, the refractive index sensing measuring apparatus including: the device comprises a corrosion Bragg fiber grating FP interferometer 5, a matching Bragg fiber grating 4, an optical amplifier 2, a fiber circulator 3, a fiber coupler 1, a photoelectric detector 6 and a spectrometer 7.
The optical signal sent by the optical amplifier 2 is input to the optical fiber circulator 3 and the matched fiber bragg grating 4, the narrow-band transmission peak wavelength of the etched fiber bragg grating FP interferometer 5 is reflected by the matched fiber bragg grating 4, the reflected narrow-band transmission peak wavelength is transmitted to the optical fiber coupler 1 to form laser, and the laser is output through the first output end of the optical fiber coupler 1.
The corrosion bragg fiber grating FP interferometer is composed of two identical high-reflection bragg fiber gratings, and is obtained by performing cladding corrosion on a portion between two bragg fiber gratings of the FP interferometer composed of the bragg fiber grating pairs; the grating interferometer has two narrow-band transmission peaks, and the wavelength of the reflection peak of the matched Bragg fiber grating is aligned with the wavelength of the two narrow-band transmission peaks of the corrosion Bragg fiber grating FP interferometer.
That is to say, the corrosion bragg fiber grating FP interferometer has two narrow-band transmission peaks, the narrow-band transmission peak wavelength includes a first narrow-band transmission peak wavelength and a second narrow-band transmission peak wavelength, and both the first narrow-band transmission peak wavelength and the second narrow-band transmission peak wavelength are located in the reflection band of the matched bragg fiber grating, so that the corrosion bragg fiber grating FP interferometer is used as a wavelength selection device of the dual-wavelength fiber laser and is also used as a refractive index sensing device, when an external refractive index changes, an optical path difference between two gratings of the corrosion bragg fiber grating FP interferometer changes, and further, a wavelength interval of the narrow-band transmission peaks of the bragg fiber grating FP interferometer changes, thereby causing the wavelength interval of the dual-wavelength fiber laser to change.
The photoelectric detector 6 beats the laser to generate a microwave signal frequency, and the microwave signal frequency is measured by the frequency spectrograph 7, so as to obtain the refractive index of the solution to be measured according to the microwave signal frequency and a pre-drawn relation curve.
Refractive index measurement is performed by the frequency of the microwave signal generated by the beat frequency, and the minute wavelength interval change caused by the refractive index change is converted into the change of the frequency of the microwave signal, so that the performances of sensitivity, resolution and the like of sensing are greatly improved.
That is to say, a sensing head (corrosion bragg fiber grating FP interferometer) of the refractive index sensing and measuring device is placed in the solution to be measured, the frequency of the microwave signal is measured by the spectrometer 7 of the refractive index sensing and measuring device, and the refractive index corresponding to the frequency of the microwave signal is found on the relation curve according to the measured frequency of the microwave signal, and the refractive index is the refractive index of the solution to be measured.
As an embodiment, as shown in fig. 1, the optical amplifier 2 is a semiconductor optical amplifier, an input end of the semiconductor optical amplifier is connected to the second output end of the optical fiber coupler 1, an output end of the semiconductor optical amplifier is connected to an input end of the optical fiber circulator 3, a reflection end of the optical fiber circulator 3 is connected to the matched bragg optical fiber grating 4, an output end of the optical fiber circulator 3 is connected to one end of the corrosion bragg optical fiber grating FP interferometer 5, another end of the corrosion bragg optical fiber grating FP interferometer 5 is connected to an input end of the optical fiber coupler 1, a first output end of the optical fiber coupler 1 is optically connected to an input end of the photodetector 6, and an output end of the photodetector 6 is electrically connected to an input end of the spectrometer 7.
In summary, the refractive index sensing measurement apparatus provided by the embodiment of the invention includes an etched bragg fiber grating FP interferometer, a matched bragg fiber grating, an optical amplifier, an optical fiber circulator, an optical fiber coupler, a photodetector, and a spectrometer, wherein an optical signal transmitted by the optical amplifier is input to the optical fiber circulator and the matched bragg fiber grating, and the narrow-band transmission peak wavelength of the corrosion Bragg fiber grating FP interferometer is reflected by matching the Bragg fiber grating, transmitting the reflected narrow-band transmission peak wavelength to the optical fiber coupler to form laser, outputting the laser through the first output end of the optical fiber coupler, beating the laser by the photoelectric detector, generating microwave signal frequency, and measuring the microwave signal frequency through a frequency spectrograph so as to obtain the refractive index of the solution to be measured according to the microwave signal frequency and a pre-drawn relation curve; therefore, the corrosion Bragg fiber grating FP interferometer has the spectral characteristics of two narrow-band transmission peaks, and is used as a wavelength selection device of a dual-wavelength fiber laser and a refractive index sensing device; when the external refractive index is changed, the optical path difference between two gratings of the corrosion Bragg fiber grating FP interferometer is changed, so that the wavelength interval of a transmission peak is changed, and the wavelength interval of the dual-wavelength fiber laser is changed; and then, a photoelectric detector is adopted to beat frequency of the output laser, and the refractive index of the liquid to be detected can be obtained by measuring the change of the frequency of a microwave signal generated by the beat frequency, so that the signal-to-noise ratio and the resolution of the refractive index sensing and measuring device are not limited by bandwidth, and the sensitivity and the resolution of sensing are greatly improved.
In order to implement the above embodiment, as shown in fig. 2, an embodiment of the present invention further provides a refractive index sensing measurement method, including the following steps:
and 101, placing the corrosion Bragg fiber grating FP interferometer into a solution to be detected.
And step 102, opening a switch of the semiconductor optical amplifier so that an optical signal sent by the semiconductor optical amplifier is input to the optical fiber circulator and the matched Bragg fiber grating, and reflecting the narrow-band transmission peak wavelength of the corrosion Bragg fiber grating FP interferometer through the matched Bragg fiber grating so as to transmit the reflected narrow-band transmission peak wavelength to the optical fiber coupler to form laser.
And 103, beating the laser through a photoelectric detector to generate a microwave signal frequency, and measuring the microwave signal frequency through a frequency spectrograph.
And 104, acquiring the refractive index of the solution to be detected according to the microwave signal frequency and a pre-drawn relation curve.
As an embodiment, as shown in fig. 2, the relation curve plotting method includes the steps of:
And step 203, beating the laser through a photoelectric detector to generate a microwave signal frequency, and measuring the microwave signal frequency through a frequency spectrograph.
And step 204, drawing a relation curve according to the microwave signal frequency and the known solution refractive index.
It should be noted that, the corresponding relationship between the microwave signal frequency v and the refractive index is measured by the frequency spectrometer 7: and v ═ f (n), and drawing a relation curve.
That is to say, the refractive index sensing and measuring device and the solutions with known refractive indexes which are prepared in advance can obtain the solutions with known refractive indexes which are prepared in advance and the corresponding microwave signal frequencies thereof, so as to obtain a pre-drawn relation curve chart.
For one embodiment, the narrowband transmission peak wavelengths include a first narrowband transmission peak wavelength and a second narrowband transmission peak wavelength, both located in a reflection band of the matched bragg fiber grating.
As an embodiment, the optical fiber coupler is a 90:10 optical fiber coupler, the first output port of the optical fiber coupler is a 10% output port, and the second output port of the optical fiber coupler is a 90% output port.
It should be noted that the device used in the refractive index sensing and measuring method of the present embodiment is the refractive index sensing and measuring device, so the explanation of the embodiment of the refractive index sensing and measuring device is also applicable to the refractive index sensing and measuring method of the present embodiment, and is not repeated here.
In summary, according to the refractive index sensing measurement method of the embodiment of the invention, firstly, the corrosion bragg fiber grating FP interferometer is placed in a solution to be measured; then, a switch of the semiconductor optical amplifier is opened so that an optical signal sent by the semiconductor optical amplifier is input to the optical fiber circulator and the matched Bragg optical fiber grating, and the narrow-band transmission peak wavelength of the corrosion Bragg optical fiber grating FP interferometer is reflected by the matched Bragg optical fiber grating so as to transmit the reflected narrow-band transmission peak wavelength to the optical fiber coupler to form laser; then, beating the laser through a photoelectric detector to generate a microwave signal frequency, and measuring the microwave signal frequency through a frequency spectrograph; finally, obtaining the refractive index of the solution to be measured according to the microwave signal frequency and a pre-drawn relation curve; therefore, the refractive index sensing and measuring device is adopted for refractive index measurement, so that the sensitivity and the resolution of sensing are greatly improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A refractive index sensing and measuring device is characterized by comprising an etched Bragg fiber grating FP interferometer, a matched Bragg fiber grating, an optical amplifier, a fiber circulator, a fiber coupler, a photoelectric detector and a spectrometer, the optical signal sent by the optical amplifier is input into the optical fiber circulator and the matched Bragg fiber grating, and the narrow-band transmission peak wavelength of the corrosion Bragg fiber grating FP interferometer is reflected by the matching Bragg fiber grating, transmitting the reflected narrow band transmission peak wavelength to the fiber coupler to form laser light and outputting the laser light through a first output end of the fiber coupler, the photodetector beating the laser light, to generate a microwave signal frequency and to measure the microwave signal frequency by means of the spectrometer, so as to obtain the refractive index of the solution to be measured according to the microwave signal frequency and a pre-drawn relation curve.
2. The refractive index sensing measurement device of claim 1, wherein the narrowband transmission peak wavelengths include a first narrowband transmission peak wavelength and a second narrowband transmission peak wavelength, both of the first narrowband transmission peak wavelength and the second narrowband transmission peak wavelength being located in a reflection band of the matched bragg fiber grating.
3. The refractive index sensing measurement apparatus according to claim 1, wherein the optical amplifier is a semiconductor optical amplifier, an input end of the semiconductor optical amplifier is connected to the second output end of the optical fiber coupler, an output end of the semiconductor optical amplifier is connected to an input end of the optical fiber circulator, a reflection end of the optical fiber circulator is connected to the matched bragg fiber grating, an output end of the optical fiber circulator is connected to one end of the etched bragg fiber grating FP interferometer, another end of the etched bragg fiber grating FP interferometer is connected to an input end of the optical fiber coupler, a first output end of the optical fiber coupler is optically connected to an input end of the photodetector, and an output end of the photodetector is electrically connected to an input end of the spectrometer.
4. The refractive index sensing measurement device of claim 1, wherein the fiber coupler is a 90:10 fiber coupler, the first output port of the fiber coupler is a 10% output port, and the second output port of the fiber coupler is a 90% output port.
5. A method of refractive index sensing measurement, comprising the steps of:
placing the corrosion Bragg fiber grating FP interferometer into a solution to be tested;
opening a switch of a semiconductor optical amplifier so that an optical signal sent by the semiconductor optical amplifier is input to an optical fiber circulator and a matched Bragg optical fiber grating, and reflecting a narrow-band transmission peak wavelength of a corrosion Bragg optical fiber grating (FP) interferometer through the matched Bragg optical fiber grating so as to transmit the reflected narrow-band transmission peak wavelength to an optical fiber coupler to form laser;
beating the laser through a photoelectric detector to generate a microwave signal frequency, and measuring the microwave signal frequency through a frequency spectrograph;
and obtaining the refractive index of the solution to be detected according to the microwave signal frequency and a pre-drawn relation curve.
6. The refractive index sensing measurement method of claim 5, further comprising the following steps before placing the etched fiber bragg grating (FP) interferometer in a solution to be measured:
placing the corroded Bragg fiber grating FP interferometer into a pre-prepared solution with a known refractive index;
opening a switch of a semiconductor optical amplifier so that an optical signal sent by the semiconductor optical amplifier is input to an optical fiber circulator and a matched Bragg optical fiber grating, and reflecting a narrow-band transmission peak wavelength of a corrosion Bragg optical fiber grating (FP) interferometer through the matched Bragg optical fiber grating so as to transmit the reflected narrow-band transmission peak wavelength to an optical fiber coupler to form laser;
beating the laser through a photoelectric detector to generate a microwave signal frequency, and measuring the microwave signal frequency through a frequency spectrograph;
and drawing a relation curve according to the microwave signal frequency and the known solution refractive index.
7. The refractive index sensing measurement method of claim 5, wherein the narrowband transmission peak wavelengths include a first narrowband transmission peak wavelength and a second narrowband transmission peak wavelength, both of which are located in a reflection band of the matched Bragg fiber grating.
8. The refractive index sensing measurement method of claim 5, wherein the fiber coupler is a 90:10 fiber coupler, the first output port of the fiber coupler is a 10% output port, and the second output port of the fiber coupler is a 90% output port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010115101.9A CN111257283B (en) | 2020-02-25 | 2020-02-25 | Refractive index sensing measurement device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010115101.9A CN111257283B (en) | 2020-02-25 | 2020-02-25 | Refractive index sensing measurement device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111257283A true CN111257283A (en) | 2020-06-09 |
| CN111257283B CN111257283B (en) | 2021-09-03 |
Family
ID=70949398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010115101.9A Active CN111257283B (en) | 2020-02-25 | 2020-02-25 | Refractive index sensing measurement device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111257283B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324240A (en) * | 2021-12-31 | 2022-04-12 | 清华大学 | Refractive index measuring device and measuring method |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004088290A1 (en) * | 2003-04-02 | 2004-10-14 | Rand Afrikaans University | A fibre optic sensor for measurement of refractive index |
| US6885792B2 (en) * | 2002-09-24 | 2005-04-26 | Furukawa Electric North America Inc. | Wavelength monitoring optical fibers using detection in the near field |
| US20060215959A1 (en) * | 2005-03-22 | 2006-09-28 | Mccarthy Kevin T | Fiber optic sensing device and method of making and operating the same |
| CN101545791A (en) * | 2009-04-30 | 2009-09-30 | 暨南大学 | Optical fibre sensor and application thereof to refracting index and strain measurement |
| EP1090282B1 (en) * | 1998-03-27 | 2010-10-06 | Picometrix, LLC | A dispersive precompensator for use in an electromagnetic radiation generation and detection system |
| CN202041464U (en) * | 2011-04-13 | 2011-11-16 | 中国计量学院 | Measuring device for liquid refractive index |
| CN102721665A (en) * | 2012-05-16 | 2012-10-10 | 暨南大学 | Micro nano optical fiber grating refractive index sensor |
| CN106556574A (en) * | 2015-09-24 | 2017-04-05 | 深圳先进技术研究院 | Online two-beam interference type optic fibre refractive index sensor and refractivity tester |
| CN107044969A (en) * | 2017-04-21 | 2017-08-15 | 天津工业大学 | The fibre-optical sensing device and measuring method of differential intensity modulation measurement liquid refractivity |
| CN108225603A (en) * | 2017-12-29 | 2018-06-29 | 北京信息科技大学 | Based on LPFG and the cascade two-parameter fibre optical sensors of FBG and preparation method thereof |
| CN109211839A (en) * | 2018-09-01 | 2019-01-15 | 哈尔滨工程大学 | A kind of binary channels side-hole fiber grating sensing device |
-
2020
- 2020-02-25 CN CN202010115101.9A patent/CN111257283B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1090282B1 (en) * | 1998-03-27 | 2010-10-06 | Picometrix, LLC | A dispersive precompensator for use in an electromagnetic radiation generation and detection system |
| US6885792B2 (en) * | 2002-09-24 | 2005-04-26 | Furukawa Electric North America Inc. | Wavelength monitoring optical fibers using detection in the near field |
| WO2004088290A1 (en) * | 2003-04-02 | 2004-10-14 | Rand Afrikaans University | A fibre optic sensor for measurement of refractive index |
| US20060215959A1 (en) * | 2005-03-22 | 2006-09-28 | Mccarthy Kevin T | Fiber optic sensing device and method of making and operating the same |
| CN101545791A (en) * | 2009-04-30 | 2009-09-30 | 暨南大学 | Optical fibre sensor and application thereof to refracting index and strain measurement |
| CN202041464U (en) * | 2011-04-13 | 2011-11-16 | 中国计量学院 | Measuring device for liquid refractive index |
| CN102721665A (en) * | 2012-05-16 | 2012-10-10 | 暨南大学 | Micro nano optical fiber grating refractive index sensor |
| CN106556574A (en) * | 2015-09-24 | 2017-04-05 | 深圳先进技术研究院 | Online two-beam interference type optic fibre refractive index sensor and refractivity tester |
| CN107044969A (en) * | 2017-04-21 | 2017-08-15 | 天津工业大学 | The fibre-optical sensing device and measuring method of differential intensity modulation measurement liquid refractivity |
| CN108225603A (en) * | 2017-12-29 | 2018-06-29 | 北京信息科技大学 | Based on LPFG and the cascade two-parameter fibre optical sensors of FBG and preparation method thereof |
| CN109211839A (en) * | 2018-09-01 | 2019-01-15 | 哈尔滨工程大学 | A kind of binary channels side-hole fiber grating sensing device |
Non-Patent Citations (1)
| Title |
|---|
| LI-YANG SHAO 等: "Optical Refractive-Index Sensor Based on Dual Fiber-Bragg Gratings Interposed With a Multimode-Fiber Taper", 《IEEE PHOTONICS TECHNOLOGY LETTERS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324240A (en) * | 2021-12-31 | 2022-04-12 | 清华大学 | Refractive index measuring device and measuring method |
| CN114324240B (en) * | 2021-12-31 | 2024-04-09 | 清华大学 | Refractive index measuring device and refractive index measuring method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111257283B (en) | 2021-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5945666A (en) | Hybrid fiber bragg grating/long period fiber grating sensor for strain/temperature discrimination | |
| CA2509187C (en) | Optical wavelength determination using multiple measurable features | |
| US6525308B1 (en) | Apparatus and method for wavelength detection with fiber bragg grating sensors | |
| US7890280B2 (en) | Method and a system for determining a physical property as a function of position | |
| US9146095B2 (en) | FBG vibration detection system, apparatus and vibration detection method using the system | |
| US9784567B2 (en) | Distributed brillouin sensing using correlation | |
| CN104848980B (en) | Bridge cable Suo Li online test methods and system based on Fibre Optical Sensor | |
| JP2001507446A (en) | Distributed strain and temperature sensing system | |
| RU102256U1 (en) | DEVICE FOR MEASURING PHYSICAL FIELD PARAMETERS | |
| CN210089716U (en) | Multi-parameter synchronous sensing acquisition instrument based on multi-core optical fiber sensing | |
| US20190170609A1 (en) | Birefringent multi-peak optical reference element and birefringent sensor system | |
| JP3740500B2 (en) | OFDR multi-point strain measuring device | |
| CN111257283B (en) | Refractive index sensing measurement device and method | |
| CN110440837B (en) | Multi-parameter optical fiber synchronous sensing acquisition instrument and sensing acquisition method | |
| RU2512616C2 (en) | Method of measuring parameters of physical fields and device for realising said method | |
| RU2608394C1 (en) | Device for measuring parameters of physical fields | |
| JP2017207458A (en) | Physical quantity measuring device using FBG | |
| CN109612601B (en) | Power equipment temperature and partial discharge integrated detection system and method | |
| US11754465B2 (en) | Optical pulse testing device and optical pulse testing method | |
| RU92180U1 (en) | DEVICE FOR MEASURING PHYSICAL FIELD PARAMETERS | |
| US20050230607A1 (en) | Determination of a physical state of an optical device | |
| CN110823530B (en) | Method for obtaining quality factor of micro-resonant cavity | |
| RU161644U1 (en) | DEVICE FOR MEASURING PHYSICAL FIELD PARAMETERS | |
| RU2495380C2 (en) | Measuring method of parameters of physical fields | |
| CN113091947A (en) | ASE time domain correlation compression distributed optical fiber Raman temperature sensing device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |