CN219777959U - Gravity measurement system based on fiber Bragg grating - Google Patents
Gravity measurement system based on fiber Bragg grating Download PDFInfo
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- CN219777959U CN219777959U CN202321119593.4U CN202321119593U CN219777959U CN 219777959 U CN219777959 U CN 219777959U CN 202321119593 U CN202321119593 U CN 202321119593U CN 219777959 U CN219777959 U CN 219777959U
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- 239000000835 fiber Substances 0.000 title claims abstract description 69
- 230000005484 gravity Effects 0.000 title claims abstract description 54
- 238000005259 measurement Methods 0.000 title claims abstract description 24
- 239000013307 optical fiber Substances 0.000 claims abstract description 55
- 238000005303 weighing Methods 0.000 claims description 8
- 238000001228 spectrum Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- 208000035209 Ring chromosome 17 syndrome Diseases 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Abstract
The utility model relates to a gravity measurement system based on fiber Bragg gratings. At present, the structure of a mechanical measuring device used for measuring the gravity of an object is simple, but the resolution is low, the data observation is inconvenient, and the reading has errors. A fiber bragg grating-based gravity measurement system comprising: the optical fiber bragg grating sensor comprises a light source (1) and a spectrometer (4), wherein the light source is connected with an optical fiber circulator (2), the optical fiber circulator is respectively connected with an optical fiber bragg grating gravity sensor (3) and an optical fiber coupler (5) through a single-mode optical fiber, the spectrometer is connected with the optical fiber coupler through an optical fiber, the optical fiber coupler is connected with an input interface of a photoelectric converter (6) through the single-mode optical fiber, the photoelectric converter is connected with an input interface of a power amplifier (7) through the single-mode optical fiber, the power amplifier is connected with an analog-to-digital converter (8), and the analog-to-digital converter is connected with a computer (9). The utility model is applied to the field of fiber Bragg gratings.
Description
Technical Field
The utility model relates to a gravity measurement system based on fiber Bragg gratings.
Background
Gravity is a physical quantity commonly used in human society, gravity measuring devices with mechanical structures, such as lever scales, spring scales and the like, are used for measuring the gravity of objects by human beings, and the gravity measuring devices with mechanical structures have simple structures, but have low resolution, inconvenient data observation and error reading. The presence of the electronic structure solves the disadvantages of some mechanical structures, and the gravity measuring device of the electronic structure has high resolution, so that the electronic signal is easily influenced by a magnetic field and has weak anti-interference capability.
With the development of technology, a fiber bragg grating is manufactured by making a periodical and permanent change of the refractive index of a fiber core along the fiber axis direction through a process method. The center wavelength of the fiber Bragg grating is very sensitive to temperature and stress variations, and the measurement of the temperature and stress variations is quite accurate. The fiber Bragg grating has the characteristics of long-term safe and reliable operation under severe environments such as inflammable, explosive, strong electromagnetic interference and the like, long-distance transmission of measurement signals and the like. The optical fiber Bragg grating is expected to solve the defect of poor anti-interference capability of the gravity measuring device of the electronic structure.
Disclosure of Invention
The utility model aims to provide a gravity measurement system based on an optical fiber Bragg grating, which is used for solving the defect of poor anti-interference capability of a gravity measurement system of an electronic structure in the prior art.
The above object is achieved by the following technical scheme:
a fiber bragg grating-based gravity measurement system comprising: the optical fiber bragg grating sensor comprises a light source and a spectrometer, wherein the light source is connected with an optical fiber circulator, the optical fiber circulator is connected with an optical fiber bragg grating gravity sensor and an optical fiber coupler interface respectively, the spectrometer is connected with the optical fiber coupler interface through a single-mode optical fiber, the optical fiber coupler interface is connected with an input interface of a photoelectric converter through a single-mode optical fiber, the photoelectric converter is connected with an input interface of a power amplifier through the single-mode optical fiber, the power amplifier is connected with an analog-to-digital converter, and the analog-to-digital converter is connected with a computer.
The gravity measurement system based on the fiber Bragg grating comprises an elastic strain gauge, a positive strain fiber Bragg grating, a negative strain fiber Bragg grating and a counterweight base, wherein the positive strain fiber Bragg grating and the negative strain fiber Bragg grating are respectively adhered to two sides of the middle position of the elastic strain gauge.
And the elastic strain gauge is respectively connected with the weighing piece and the supporting column body, and the supporting column body is connected with the fixing ring on the protective shell through a screw.
The gravity measurement system based on the fiber Bragg grating is characterized in that the fiber Bragg grating gravity sensor base is a circular plane and is provided with a counterweight.
And the elastic strain gauge is in a curved cylindrical shape, and is respectively connected with the weighing plate and the counterweight base up and down.
The gravity measurement system based on the fiber Bragg grating is characterized in that the light source is an ASE broadband light source.
The beneficial effects achieved by the utility model are as follows:
1. after the light source is connected with the sensing module, the optical fiber circulator, the photoelectric converter and the signal processing equipment which take the fiber Bragg grating gravity sensor as the core, the system has the advantages of wide frequency band, high sensitivity, strong anti-interference capability, long-term safe and reliable work under severe environments such as inflammability, explosive property, strong electromagnetic interference and the like, long-distance transmission of measurement signals and the like.
2. The positive and negative strain double-fiber Bragg grating structure effectively eliminates the influence of temperature on the center wavelength of the fiber Bragg grating and reduces errors.
3. The center wavelength of the fiber Bragg grating is very sensitive to the change of temperature and stress, and two fiber Bragg gratings are adhered to the two sides of the elastic strain gauge. The gravity of the measured object is applied to the elastic strain gauge, the elastic strain gauge is stressed to bend so that the two fiber Bragg gratings respectively generate positive strain and negative strain, therefore, the center wavelengths of the two fiber Bragg gratings are respectively deviated to two sides, and the gravity of the measured object can be calculated by processing the wavelength deviation.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model.
In the drawings:
FIG. 1 is a schematic diagram of a gravity measurement system based on a Bragg fiber grating according to the present utility model;
FIG. 2 is a schematic diagram of the internal structure of a Bragg fiber grating gravity sensor;
FIG. 3 is a schematic diagram of the external structure of a Bragg fiber grating gravity sensor;
in the figure: a light source-1; an optical fiber circulator-2; fiber Bragg grating gravity sensor-3; a spectrometer-4; an optical fiber coupler-5; a photoelectric converter-6; a power amplifier-7; an analog-to-digital converter-8; a computer-9; elastic strain gage-10; weighing piece-11; positively strained fiber bragg grating-12; adhesive agent-13; negative strain fiber Bragg grating-14; a support column 15; a set screw-16; a stationary ring-17; a protective housing-18; the optical fiber is connected with A-19; fiber interface B-20; a counterweight base-21.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Example 1:
as shown in fig. 1-3, the bragg fiber grating-based gravity measurement system of the present utility model includes a system optical path portion and a fiber bragg grating gravity sensor portion. The system light path part mainly comprises a light source 1, an optical fiber circulator 2, an optical fiber Bragg grating gravity sensor 3, a spectrometer 4, an optical fiber coupler 5, a photoelectric converter 6, a power amplifier 7 and an analog-to-digital converter 8. The fiber bragg grating gravity sensor part mainly comprises an elastic strain gauge 10, a positive strain fiber bragg grating 12, a negative strain fiber bragg grating 14 and a protective shell 18. The light source 1 is positioned at the interface 1 of the optical fiber circulator 2, the optical fiber Bragg grating gravity sensor is positioned at the interface 2 of the optical fiber circulator, and the light emitted by the light source 1 is incident to the optical fiber interface A19 and the optical fiber interface B20 of the optical fiber Bragg grating gravity sensor through the optical fiber circulator. The weighing piece 11 is welded with the elastic strain gauge 10, and the positive strain fiber Bragg grating 12 and the negative strain fiber Bragg grating 14 are respectively stuck on two sides of the elastic strain gauge 10 according to the positions shown in fig. 2 through the adhesive 13. The pressure from the object above will strain the elastic strain gauge 10 by the weighing scale 11, so that the positively strained fiber bragg grating 12 will be positively strained, while the negatively strained fiber bragg grating 14 will be negatively strained. The central wavelength of the fiber Bragg grating is very sensitive to the change of temperature and stress, and the influence of the temperature on the central wavelength of the fiber Bragg grating should be eliminated when the stress is measured. The positive strain generated by the positive strain fiber Bragg grating 12 and the negative strain generated by the negative strain fiber Bragg grating 14 can shift the center wavelength of the reflected light in two directions, so that the influence of temperature can be avoided for the shift information processing, and meanwhile, the error can be reduced.
Example 2:
the weighing piece 11, the elastic strain gauge 10 and the supporting column 15 of the fiber Bragg grating gravity sensor are welded, and the supporting column 15 can bear most of gravity of an object to be measured, so that the elastic strain gauge 10 is prevented from being excessively deformed. The fixing screw 16 is arranged below the supporting column 15, the inner structure of the fiber Bragg grating gravity sensor is connected with the protection shell 18 through the fixing screw 16 and the fixing ring 17, the protection shell 18 can protect the inner structure of the fiber Bragg grating gravity sensor, the whole fiber Bragg grating gravity sensor is firmer and more durable, and the counterweight base 21 is arranged below the protection shell 18. The light reflected by the optical fiber interface A and the optical fiber interface B passes through the interface of the optical fiber circulator 2, enters the optical fiber coupler 5 from the interface of the optical fiber circulator 2, and the optical fiber coupler 5 divides the reflected light into two beams, namely, one beam is injected into the spectrometer 4 and the other beam is injected into the photoelectric converter 6. The optical signal passes through a photoelectric converter 6, a power amplifier 7, an analog-to-digital converter 8 and a computer 9 in this order. The spectrometer 4 can more obviously observe the offset of the center wavelength of the fiber Bragg grating, the other beam of optical signals are converted into electric signals through the photoelectric converter 6, the analog electric signals are amplified through the power amplifier 7 and then are converted into digital signals through the analog-to-digital converter 8, the digital signals are finally transmitted into a computer, and the gravity of the measured object is calculated through a well-compiled algorithm in the computer.
The interface of the optical fiber coupler is connected with the input interface of the photoelectric converter through a single-mode fiber, the interface of the optical fiber coupler is connected with the spectrometer through a single-mode fiber, and the central wavelength change of the fiber Bragg grating can be observed through the spectrometer. The computer is a personal computer, but not limited to a personal computer, and can be any embedded equipment capable of realizing a data analysis function, and the gravity can be obtained by analyzing and calculating signals through the computer.
Example 3:
the design of the computer algorithm in the gravity measurement system based on the fiber Bragg grating comprises the following steps:
firstly, a system is built, the mass of a measured object is increased by 0.1g each time, the offset of the center wavelength of reflected light and the voltage value output by an analog-to-digital converter 8 are recorded, 100 groups of data are recorded, discrete experimental data are fitted, the relationship between gravity and voltage is obtained by using a least square method, and finally, a computer algorithm in a gravity measurement system of the fiber Bragg grating is written by using the relationship between gravity and voltage.
Claims (6)
1. A fiber bragg grating-based gravity measurement system comprising: light source and spectrum appearance, characterized by: the optical fiber bragg grating spectrometer is characterized in that the light source is connected with the optical fiber circulator, the optical fiber circulator is connected with the optical fiber bragg grating gravity sensor and the optical fiber coupler respectively, the spectrometer is connected with the optical fiber coupler through a single-mode optical fiber, the optical fiber coupler is connected with the photoelectric converter input interface through a single-mode optical fiber, the photoelectric converter is connected with the power amplifier input interface through a single-mode optical fiber, the power amplifier is connected with the analog-to-digital converter, and the analog-to-digital converter is connected with the computer.
2. The fiber bragg grating-based gravity measurement system of claim 1, wherein: the fiber Bragg grating gravity sensor consists of an elastic strain gauge, a positive strain fiber Bragg grating, a negative strain fiber Bragg grating and a counterweight base, wherein the positive strain fiber Bragg grating and the negative strain fiber Bragg grating are respectively adhered to two sides of the middle position of the elastic strain gauge.
3. The fiber bragg grating-based gravity measurement system of claim 2, wherein: the elastic strain gauge is respectively connected with the weighing piece and the supporting column body, and the supporting column body is connected with the fixing ring on the protection shell body through screws.
4. The fiber bragg grating-based gravity measurement system of claim 2, wherein: the base of the fiber Bragg grating gravity sensor is a circular plane and is provided with a counterweight.
5. A fiber bragg grating based gravity measurement system according to claim 3, wherein: the elastic strain gauge is in a curved cylindrical shape, and is respectively connected with the weighing gauge and the counterweight base up and down.
6. The fiber bragg grating-based gravity measurement system of claim 1, wherein: the light source is an ASE broadband light source.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321119593.4U CN219777959U (en) | 2023-04-28 | 2023-04-28 | Gravity measurement system based on fiber Bragg grating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321119593.4U CN219777959U (en) | 2023-04-28 | 2023-04-28 | Gravity measurement system based on fiber Bragg grating |
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| Publication Number | Publication Date |
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| CN219777959U true CN219777959U (en) | 2023-09-29 |
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| CN202321119593.4U Active CN219777959U (en) | 2023-04-28 | 2023-04-28 | Gravity measurement system based on fiber Bragg grating |
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- 2023-04-28 CN CN202321119593.4U patent/CN219777959U/en active Active
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