CN112526000A - Optical fiber ring acoustic emission sensor and packaging method - Google Patents
Optical fiber ring acoustic emission sensor and packaging method Download PDFInfo
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- CN112526000A CN112526000A CN202011483715.9A CN202011483715A CN112526000A CN 112526000 A CN112526000 A CN 112526000A CN 202011483715 A CN202011483715 A CN 202011483715A CN 112526000 A CN112526000 A CN 112526000A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 116
- 229910052802 copper Inorganic materials 0.000 claims abstract description 110
- 239000010949 copper Substances 0.000 claims abstract description 110
- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 239000000835 fiber Substances 0.000 claims description 20
- 238000003466 welding Methods 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 10
- 239000003292 glue Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000004642 Polyimide Substances 0.000 claims description 4
- 229920001721 polyimide Polymers 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000004927 fusion Effects 0.000 claims description 2
- 241000555293 Bassariscus astutus Species 0.000 claims 1
- 239000004593 Epoxy Substances 0.000 claims 1
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000007774 longterm Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 5
- 239000011247 coating layer Substances 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- FGBJXOREULPLGL-UHFFFAOYSA-N ethyl cyanoacrylate Chemical compound CCOC(=O)C(=C)C#N FGBJXOREULPLGL-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
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- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Optical Transform (AREA)
Abstract
The invention provides an optical fiber ring acoustic emission sensor and a packaging method thereof. The optical fiber ring is embedded into the copper framework, and two tail ends of the optical fiber ring are respectively reserved with a section as an initial point and an end point; the copper optical fiber protective shell comprises a copper shell and a copper base, wherein the copper shell and the copper shell form a closed space, and a copper framework is embedded into a groove of the copper base; the optical fiber transmission line penetrates into the copper optical fiber protective shell and is welded with the tail end of the optical fiber ring. The optical fiber ring acoustic emission sensor has the advantages of high sensitivity, good stability, low cost, electromagnetic interference resistance and long-term stable work.
Description
Technical Field
The invention belongs to the technical field of acoustic emission detection, and particularly relates to an optical fiber ring acoustic emission sensor and a packaging method.
Background
Optical fiber sensing technology has been rapidly developed in recent years. The advantages of the optical fiber such as anti-electromagnetic interference, corrosion resistance, lightness, low loss, low cost and the like enable the optical fiber to replace the traditional electric sensing to be widely applied to severe environments such as strong electromagnetic interference, extreme temperature and the like.
Acoustic emission is a common physical phenomenon. The phenomenon that the energy of a local source in the structure is quickly released to generate transient elastic waves is called acoustic emission. The material is accompanied with the appearance of acoustic emission signals from the initial dislocation motion generation, the micro-crack generation and the gradual crack propagation to the material fracture process under the stress action, so the acoustic emission signals can reflect the health condition of the structure body. The sensing mechanism of the optical fiber ring acoustic emission sensor as an acoustic emission sensor is that the optical fiber is axially pulled up or compressed and deformed under the action of sound waves, so that the optical path of light transmitted in the optical fiber ring acoustic emission sensor is changed, and the phase of the light is modulated by the sound waves. The acoustic signal can then be demodulated by detecting the change in phase.
However, the optical fiber ring is wound by the bending-resistant optical fiber with high strength, and is insensitive to the induction of acoustic emission signals in the solid, so that if the optical fiber ring is specially manufactured for sensing, a skeleton needs to be added in the center of the optical fiber ring to enhance the response of the optical fiber ring to the acoustic emission signals. The traditional framework is generally made of polymers such as PE and the like, and is not high in temperature resistance.
Disclosure of Invention
Technical problem to be solved
The invention provides an optical fiber ring acoustic emission sensor and a packaging method thereof, which aim to solve the technical problems of high temperature resistance and long-term stable and normal work.
(II) technical scheme
In order to solve the technical problem, the invention provides an optical fiber ring acoustic emission sensor which comprises an optical fiber ring, a copper framework, a copper optical fiber protective shell and an optical fiber transmission line; the optical fiber ring is embedded into the copper framework, and two sections of the two tail ends of the optical fiber ring are reserved as an initial point and an end point respectively; the copper optical fiber protective shell comprises a copper shell and a copper base, wherein the copper shell and the copper shell form a closed space, and a copper framework is embedded into a groove of the copper base; the optical fiber transmission line penetrates into the copper optical fiber protective shell and is welded with the tail end of the optical fiber ring.
Furthermore, the optical fiber ring is formed by winding a high-temperature resistant single-mode optical fiber with a polyimide coating layer.
Further, the copper framework is a cylindrical solid copper column.
Furthermore, two tail ends of the optical fiber ring are stuck on the copper framework.
Further, the copper shell is a cylindrical hollow copper cylinder.
And further, carrying out closing treatment on the copper shell and the copper base by using epoxy resin high-temperature glue.
Furthermore, the metal armored double-core connecting wire used as the optical fiber transmission line is formed by melting two single-core connecting wires.
Furthermore, the fusion welding area of the optical fiber transmission line and the tail end of the optical fiber ring is protected by a hot sleeve.
In addition, the invention also provides a packaging method of the optical fiber ring acoustic emission sensor, which comprises the following steps:
s1, tightly winding the high-temperature-resistant single-mode optical fiber into a ring along the circumferential direction of the copper framework by using a ring winding machine, and reserving a section of optical fiber at each of two tail ends as an initial point and an end point;
s2, taking out the cooled copper skeleton, embedding the cooled copper skeleton into a copper base groove of the copper optical fiber protective shell, putting the copper shell of the copper optical fiber protective shell from the top, and fixing the copper shell by using screws; closing the copper shell and the copper base to isolate the inside of the copper optical fiber protective shell from the outside;
and S3, penetrating the optical fiber transmission line into the copper optical fiber protective shell, welding the two tail ends of the optical fiber ring with the optical fiber transmission line by using a welding machine, and protecting a welding area by using a thermal sleeve.
Further, in step S1, the start and end points of the fiber loop are adhered so that the fiber loop is closely attached to the copper frame.
(III) advantageous effects
The invention provides an optical fiber ring acoustic emission sensor and a packaging method thereof. The optical fiber ring is embedded into the copper framework, and two tail ends of the optical fiber ring are respectively reserved with a section as an initial point and an end point; the copper optical fiber protective shell comprises a copper shell and a copper base, wherein the copper shell and the copper shell form a closed space, and a copper framework is embedded into a groove of the copper base; the optical fiber transmission line penetrates into the copper optical fiber protective shell and is welded with the tail end of the optical fiber ring.
The optical fiber ring acoustic emission sensor is mainly used in the field of acoustic emission high-temperature detection, and has the advantages of high sensitivity, good stability, low cost, electromagnetic interference resistance and long-term stable operation. The acoustic emission sensor adopts the copper framework, so that the applicability of the sensor in a high-temperature section can be greatly improved. The optical fiber ring and the framework are externally provided with the protective shell, so that the optical fiber ring and the framework can work more stably at high temperature, the natural frequency of the shell is close to the frequency of an acoustic emission signal required to be measured, the acoustic emission signal transmitted to the optical fiber ring by the framework can be enhanced, and the sensitivity of the sensor is improved while the reliability and the stability of the sensor are improved.
Compared with the prior art, the invention has the advantages that:
(1) the packaging method provided by the invention has the advantages of high temperature resistance, simple operation, electromagnetic interference resistance of the optical fiber ring acoustic emission sensor, good sensitivity and reliability, long-term stable normal work and particular suitability for the fields of strong electromagnetic interference environment and high-temperature acoustic emission.
(2) The invention selects copper material as the framework of the optical fiber ring acoustic emission sensor. Acoustic emission wave energy can be isotropically transmitted in the copper skeleton, and the loss is extremely low and is superior to that of an organic polymer packaging material; moreover, the sensor is hard in material and good in mechanical property, and the working reliability of the sensor is improved.
(3) The winding method selected by the invention is a multilayer tight winding method, compared with the traditional method, the volume of the sensor can be greatly reduced, the sensitivity is improved, the sensor is easy to package, meanwhile, the assembly property of the sensor can be improved, and the miniaturization of the sensor is realized.
Drawings
Fig. 1 is a schematic structural diagram of an acoustic emission sensor with a fiber ring according to an embodiment of the present invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The present embodiment provides an optical fiber ring acoustic emission sensor, the structure of which is shown in fig. 1, and the optical fiber ring acoustic emission sensor includes an optical fiber ring 1, a copper framework 2, a copper optical fiber protective casing 3, and an optical fiber transmission line 4.
Winding a high-temperature resistant single-mode fiber G657B3 with a polyimide coating layer as a sensing acoustic emission signal material into a fiber ring 1 with the total length of 15m, and reserving 0.5-1.5 m at each of two tail ends of the fiber ring 1 as a starting point and an end point.
The optical fiber ring 1 is embedded into a copper framework 2, and the copper framework 2 is a cylindrical solid copper cylinder with the length of 2cm and the radius of 1 cm. And a small amount of alpha-ethyl cyanoacrylate glue is used for adhering the starting point and the ending point of the optical fiber ring 1, so that the optical fiber ring 1 is tightly adhered on the copper framework 2 without loosening.
The copper optical fiber protective shell 3 comprises a copper shell and a copper base. The copper shell is a cylindrical hollow copper cylinder with the length of 2.2cm and the radius of 1.1cm, and the copper base is a base with the radius of 1.1cm and the thickness of 2mm and a groove. The copper framework 2 is embedded into the groove of the copper base, the copper shell is placed from the top, and the copper shell is fixed through screws. And the copper shell and the copper base are closed by using epoxy resin high-temperature glue, so that the inside of the copper optical fiber protective shell 3 is isolated from the outside.
The metal armored double-core connecting wire as the optical fiber transmission line 4 is formed by melting two single-core connecting wires with the length of 30m and the radius of 1.5mm, the optical fiber transmission line 4 penetrates through the copper optical fiber protective shell 3 and is welded with the tail end of the optical fiber ring 1, and a hot sleeve is adopted to protect a welding area.
The packaging method of the optical fiber ring acoustic emission sensor comprises the following steps:
s1, tightly winding 10 layers of high-temperature-resistant single-mode optical fibers with a total length of 15 meters and polyimide coating layers G657B3 in a ring winding machine along a copper framework 2 ring with the length of 2cm and the radius of 1cm to form a ring, reserving 0.5-1.5 m of optical fibers at two tail ends as a starting point and an end point respectively, and using a small amount of alpha-ethyl cyanoacrylate glue to adhere the starting point and the end point of the optical fiber ring to ensure that the optical fiber ring 1 is tightly adhered to the copper framework 2 without looseness;
s2, taking out the cooled copper framework 2, embedding the cooled copper framework 2 into a copper base groove of the copper optical fiber protective shell 3, putting the copper shell of the copper optical fiber protective shell 3 from the top, and fixing the copper shell by using screws; the copper shell and the copper base are closed by epoxy resin high-temperature glue, so that the inside of the copper optical fiber protective shell 3 is isolated from the outside;
and S3, penetrating the metal armored double-core connecting wire serving as the optical fiber transmission line 4 into the copper optical fiber protective shell 3, welding the two tail ends of the optical fiber ring 1 with the optical fiber transmission line 4 by using a welding machine, and protecting a welding area by using a thermal sleeve.
Taking lead-breaking signals as an example, a high-temperature area of 300 ℃ is manufactured by quartz lamplight, one end of the optical fiber ring acoustic emission sensor is fixed on a fixed aluminum plate in the high-temperature area by a coupling agent, a metal cylindrical shell is kept perpendicular to the fixed aluminum plate as much as possible, lead breaking is carried out at a position 5mm away from the edge of the sensor, and the lead-breaking acoustic emission signals can be measured. The sensor needs an equivalent sensor with the same length as the optical fiber of the sensor as a reference branch for measurement.
The amplitude of the lead-cut signal can reach 85dB in measurement, and the noise amplitude is 15-35dB due to the difference of the adopted photoelectric detectors. When PZT is used as a signal generator, the sine wave signal is measured by the optical fiber ring acoustic emission sensor in the application, and the detectable frequency range is 50kHz-300 kHz.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The optical fiber ring acoustic emission sensor is characterized by comprising an optical fiber ring, a copper framework, a copper optical fiber protective shell and an optical fiber transmission line; wherein the content of the first and second substances,
the optical fiber ring is embedded into the copper framework, and two sections of the two tail ends of the optical fiber ring are reserved as an initial point and an end point respectively; the copper optical fiber protective shell comprises a copper shell and a copper base, wherein the copper shell and the copper shell form a closed space, and a copper framework is embedded into a groove of the copper base; and the optical fiber transmission line penetrates into the copper optical fiber protective shell and is welded with the tail end of the optical fiber ring.
2. A fiber ring acoustic emission sensor according to claim 1, wherein the fiber ring is wound from a high temperature resistant single mode fiber having a polyimide coating.
3. A fiber optic ring acoustic emission sensor in accordance with claim 1, wherein said copper skeleton is a cylindrical solid copper cylinder.
4. A fiber optic ring acoustic emission sensor as claimed in claim 1, wherein two ends of said fiber optic ring are bonded to a copper frame.
5. A fiber optic ring acoustic emission sensor in accordance with claim 1, wherein said copper shell is a cylindrical hollow copper cylinder.
6. A fiber optic ring acoustic emission sensor in accordance with claim 1, wherein the copper shell and the copper base are closed with an epoxy high temperature glue.
7. An optical fiber loop acoustic emission sensor according to claim 1, wherein the metal clad two-core connection wire as the optical fiber transmission line is formed by fusing two single-core connection wires.
8. A fiber optic ring acoustic emission sensor as claimed in claim 1, wherein the fusion splice region of the fiber optic transmission line and the fiber optic ring tail end is protected by a thermal sleeve.
9. A packaging method for an optical fiber ring acoustic emission sensor is characterized by comprising the following steps:
s1, tightly winding the high-temperature-resistant single-mode optical fiber into a ring along the circumferential direction of the copper framework by using a ring winding machine, and reserving a section of optical fiber at each of two tail ends as an initial point and an end point;
s2, taking out the cooled copper skeleton, embedding the cooled copper skeleton into a copper base groove of the copper optical fiber protective shell, putting the copper shell of the copper optical fiber protective shell from the top, and fixing the copper shell by using screws; closing the copper shell and the copper base to isolate the inside of the copper optical fiber protective shell from the outside;
and S3, penetrating the optical fiber transmission line into the copper optical fiber protective shell, welding the two tail ends of the optical fiber ring with the optical fiber transmission line by using a welding machine, and protecting a welding area by using a thermal sleeve.
10. A method for packaging an acoustic emission sensor having a fiber ring according to claim 9, wherein the start and end points of the fiber ring are adhered to make the fiber ring closely fit to the copper frame in step S1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011483715.9A CN112526000A (en) | 2020-12-15 | 2020-12-15 | Optical fiber ring acoustic emission sensor and packaging method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113552223A (en) * | 2021-07-21 | 2021-10-26 | 北京航空航天大学 | Torsion shaft multi-channel acoustic emission detection system based on optical fiber interferometer and defect detection method |
| CN113552221A (en) * | 2021-07-21 | 2021-10-26 | 北京航空航天大学 | Dynamic modeling method of optical fiber ring acoustic emission sensor and frequency response characteristic design method thereof |
| CN113552222A (en) * | 2021-07-21 | 2021-10-26 | 北京航空航天大学 | Novel structure of optical fiber ring acoustic emission sensor and static modeling method thereof |
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