CN210243096U - Water seepage detection system for optical cable splice closure - Google Patents
Water seepage detection system for optical cable splice closure Download PDFInfo
- Publication number
- CN210243096U CN210243096U CN201920892647.8U CN201920892647U CN210243096U CN 210243096 U CN210243096 U CN 210243096U CN 201920892647 U CN201920892647 U CN 201920892647U CN 210243096 U CN210243096 U CN 210243096U
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- optical cable
- optical
- distributed
- fiber
- 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.)
- Active
Links
Images
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model discloses an optical cable splice box infiltration detection device relates to sensing technical field, optical cable splice box infiltration detecting system includes: a distributed optical fiber temperature sensor; the distributed optical fiber temperature sensor comprises an optical fiber; at least one optical cable splice closure is distributed on the optical fiber; the optical fiber penetrates through the optical cable junction box and is fixedly connected with the optical cable junction box; the water seepage detection system of the optical cable splice closure further comprises a moisture absorption heating material; the moisture absorption heating material is contained in the optical cable connecting box. Adopt the technical scheme provided by the utility model, can improve the precision that detects the infiltration of optical cable splice closure, be favorable to realizing long distance distributed detection.
Description
Technical Field
The utility model relates to a sensing technology field especially relates to an optical cable splice box infiltration detecting system.
Background
Currently, optical fiber plays an important role in information transmission all over the world, and has many advantages such as interference resistance, large bandwidth, low cost, etc., so that optical fiber and related fields thereof have been developed rapidly in nearly 30 years. Optical fiber splicing is one of the most common and important links in optical cable engineering, and the optical fiber splicing process and the selection of an optical cable splicing box influence the performance of optical fibers and the service life of optical cables. However, as the operational life of the optical cable increases, the performance index of the optical fiber changes abnormally, most of the faults of the optical fiber occur in the optical cable junction box on the optical cable, and the water seepage of the optical cable junction box is the main fault of the optical cable junction box.
Cable closures are subject to water penetration because of compromised hermeticity of the cable closure. The optical cable junction box works in a severe environment for a long time, which makes the problem of the sealing performance of the optical cable junction box being damaged difficult to avoid. For example, the sealing performance of the optical cable closure gradually deteriorates due to corrosive deformation caused by year-round operation in air with a large acid-base concentration, and for example, the sealing performance of the optical cable closure is damaged due to mechanical deformation caused by external force impact. In addition, the aging of the material of the closure itself is one of the reasons why the hermeticity of the cable closure is impaired.
Due to the laying characteristics of the optical cables, the optical cable splice closure is generally buried several meters deep underground, and the splice closure of the submarine optical cable is even underwater, so that great difficulty is added to troubleshooting operation of the splice closure; meanwhile, the distance between the optical cables is long, and the number of the splicing cassettes is large, so that the detection and positioning of the splicing cassettes are difficult abnormally. The prior art mainly detects the spare optical fiber equipped with to the optical cable system, whether splice closure that corresponds with the gauge point oozes water is confirmed through the loss variation of each gauge point of comparison spare optical fiber, but the detection accuracy of this kind of method is low, and, prior art can detect the optical cable splice closure infiltration after the water that permeates the optical cable splice closure has led to the fact the loss to spare optical fiber, a certain gauge point of spare optical fiber has revealed this moment, the signal of follow-up gauge point is weakened in the loss of optic fibre, be unfavorable for realizing long distance ground distributed detection.
SUMMERY OF THE UTILITY MODEL
Therefore, the water seepage detection system for the optical cable splice closure is needed to be provided, the water seepage precision of the optical cable splice closure can be improved, and long-distance distributed detection is facilitated.
The utility model provides an optical cable splice box infiltration detecting system includes: a distributed optical fiber temperature sensor; the distributed optical fiber temperature sensor comprises an optical fiber; at least one optical cable splice closure is distributed on the optical fiber; the optical fiber penetrates through the optical cable junction box and is fixedly connected with the optical cable junction box; the water seepage detection system of the optical cable splice closure further comprises a moisture absorption heating material; the moisture absorption heating material is contained in the optical cable connecting box.
In an optional embodiment, the distributed optical fiber temperature sensor is a distributed optical fiber raman thermometry sensing system.
In an optional embodiment, the distributed optical fiber temperature sensor further comprises a pulse laser, an optical fiber wavelength division multiplexer, a first photodetector, a second photodetector and a data acquisition card; the optical fiber wavelength division multiplexer comprises a first port, a second port, a third port and a fourth port; the output end of the pulse laser is connected with the first port of the optical fiber wavelength division multiplexer; the second port of the optical fiber wavelength division multiplexer is connected with the optical fiber; a third port of the optical fiber wavelength division multiplexer is connected with the input end of the first photoelectric detector; a fourth port of the optical fiber wavelength division multiplexer is connected with the input end of the second photoelectric detector; the data acquisition card comprises a first input end and a second input end; the first input end of the data acquisition card is connected with the output end of the first photoelectric detector; and the second input end of the data acquisition card is connected with the output end of the second photoelectric detector.
In an optional embodiment, the pulse laser outputs pulse laser with the wavelength value within 1545 nm-1555 nm; the first photoelectric detector can detect light with a wavelength value range falling within 1445 nm-1465 nm; the second photodetector is capable of detecting light having a wavelength within a range of 1645nm to 1665 nm.
In an alternative embodiment, the hygroscopic exothermic material coats the outer wall of the optical fiber.
In an optional implementation mode, a material containing box for containing the moisture absorption and heat generation material is arranged in the optical cable splice box; the material containing box is provided with at least one water seepage hole.
In an alternative embodiment, the hygroscopic exothermic material coats the outer wall of the optical fiber; the material containing box is also provided with two through holes for the optical fibers to penetrate through the material containing box.
In an alternative embodiment, the optical fiber of the distributed fiber optic temperature sensor is a fiber optic cable backup optical fiber.
In an alternative embodiment, the optical fiber of the distributed optical fiber temperature sensor is a temperature-sensing optical fiber.
In an alternative embodiment, the hygroscopic exothermic material is calcium chloride, montmorillonite or acrylic fiber.
Compared with the prior art, the utility model provides an optical cable splice closure infiltration detecting system utilizes the moisture absorption to generate heat the humidity in the characteristic monitoring optical cable splice closure of material, when certain optical cable splice closure infiltration that distributes on the optic fibre, the heat is gived off after the moisture absorption to the moisture absorption material that generates heat in this optical cable splice closure in to the holding, consequently, acquire the temperature of optic fibre in the optical cable splice closure that distributes on the optic fibre through distributed optical fiber temperature sensor appearance, can detect the optical cable splice closure infiltration, can fix a position the optical cable splice closure of infiltration through the optical time domain reflection technology. The utility model detects the water seepage of the optical cable splice closure by monitoring the temperature, which hardly causes the loss of optical fiber signals and is beneficial to the improvement of the detection precision; simultaneously, for the way that detects the optical cable splice closure infiltration through the loss variation volume that detects optic fibre, the utility model discloses greatly degree ground has reduced the risk that the probe point revealed, is favorable to realizing long distance distributed detection.
Drawings
Fig. 1 is a schematic structural view of an optical cable splice closure water seepage detection system according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a water seepage detection system of an optical cable closure according to another embodiment of the present invention;
FIG. 3 is a graph showing the relationship between the intensity of Stokes scattered light and time;
fig. 4 is a graph showing the relationship between the light intensity of anti-stokes scattered light and time.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Please refer to fig. 1, which is a schematic structural diagram of a water seepage detection system of an optical cable splice closure according to an embodiment of the present invention. As shown in fig. 1, the system 1 for detecting water leakage of an optical cable closure provided in this embodiment includes: a distributed optical fiber temperature sensor 10. The distributed fiber optic temperature sensor 10 includes an optical fiber 101. The optical fiber 101 may be a single mode optical fiber or a multimode optical fiber. The optical fiber 101 of the distributed optical fiber temperature sensor may use the optical fiber of the existing optical cable line. In this embodiment, the optical fiber of the distributed optical fiber temperature sensor is a cable spare optical fiber. Generally, an optical cable spare optical fiber is configured on an original optical cable (not shown in fig. 1), so that the optical cable spare optical fiber is used as an optical fiber of the distributed optical fiber temperature sensor, the demodulation difficulty is reduced, the influence on a signal of a communication optical fiber is avoided, and the laid optical cable does not need to be changed. In other embodiments, the optical fiber of the distributed fiber optic temperature sensor may be a temperature sensitive optical fiber. By using the special temperature sensing optical fiber, the temperature detection precision can be improved, and the water seepage detection precision is further improved.
A plurality of cable closures 20 (only one of which is shown in fig. 1) are distributed on the optical fiber 101, so that the temperature distribution of each probing point on the optical fiber 101 can be obtained by the distributed optical fiber temperature sensor 10. The optical fibers 101 extend through the cable closure 20 and are fixedly attached to the cable closure 20. The optical fibers 101 may be fixedly connected to the cable closure 20 indirectly or directly. It should be noted that the number of the cable closure 20 is at least one, for example, the number of the cable closures may be multiple or one, and the number may be adjusted according to actual requirements.
The water seepage detection system 1 of the optical cable splice closure further comprises a moisture absorption heating material. The hygroscopic exothermic material is contained in the cable closure 20. Wherein, the hygroscopic exothermic material can be calcium chloride, montmorillonite, acrylic fiber or other hygroscopic exothermic materials.
Among them, Montmorillonite (Montmorillonite) is a layered mineral composed of a very fine-grained hydrous aluminosilicate. Acrylic fiber, a scientific name of polyacrylonitrile fiber, is a fiber obtained by copolymerizing acrylonitrile as a main monomer with a small amount of other monomers and spinning.
The hygroscopic heating material 30 is coated on the outer wall of the optical fiber 101, so that heat can be transferred to the optical fiber more quickly, the detection sensitivity is improved, the requirement on the heat dissipation performance of the hygroscopic heating material is reduced, and the cost is effectively reduced. Since only the optical fiber is required to be able to sense the temperature change, in other embodiments, the hygroscopic heat-generating material may not be coated on the outer wall of the optical fiber 101, and may be attached to, for example, the outer wall side of the optical fiber, or the inner wall of the cable closure 20.
The optical cable splice closure 20 is provided with a material containing box 32 for containing moisture-absorbing and heat-generating materials. The pod 32 may be cylindrical, rectangular, spherical, or other shape. The material containing box 32 is provided with at least one water seepage hole. The diameter of the water seepage holes can be adjusted according to the specific characteristics of the moisture absorption heating material, the number of the water seepage holes can be one or more, and the water seepage holes can be adjusted by specifically combining the specific characteristics of the moisture absorption heating material or the material, environment and other factors of the optical cable splicing box. The magazine is also provided with two through holes (not shown in fig. 1) for the optical fibers to pass through the magazine 32.
In this embodiment, the distributed optical fiber temperature sensor 10 is a distributed optical fiber raman temperature measurement sensing system, and in other embodiments, the distributed optical fiber temperature sensor 10 may be a phase-sensitive optical time domain reflection system.
Referring to fig. 2, in this embodiment, the distributed optical fiber temperature sensor further includes a pulse laser 102, an optical fiber wavelength division multiplexer 103, a first photodetector 104, a second photodetector 105, and a data acquisition card 106. The fiber wavelength division multiplexer 103 includes a first port, a second port, a third port, and a fourth port. The output end of the pulse laser 102 is connected to the first port of the fiber wavelength division multiplexer 103. A second port of the fiber wavelength division multiplexer 103 is connected to the optical fiber 101. The third port of the fiber wavelength division multiplexer 103 is connected to the input of the first photodetector 104. The fourth port of the fiber wavelength division multiplexer 103 is connected to the input of the second photodetector 105. The data acquisition card 106 comprises a first input and a second input. A first input of the data acquisition card 106 is connected to an output of said first photodetector 104. A second input of the data acquisition card 106 is connected to an output of the second photodetector 105. It should be noted that the specific embodiment of the distributed optical fiber temperature sensor is not limited to this, for example, in other embodiments, the distributed optical fiber temperature sensor may further include a second pulse laser, an electronic switch, and the like.
In the present embodiment, the wavelength of the pulsed laser output by the pulsed laser 102 falls within a range of 1545 nm-1555 nm, and preferably, the wavelength of the pulsed laser output by the pulsed laser 102 is 1550nm (nanometers).
The first photoelectric detector can detect light with a wavelength value range of 1445 nm-1465 nm, and it should be noted that the wavelength value range of light actually detected by the first photoelectric detector can be larger than the value range of 1445 nm-1465 nm, for example, 1420 nm-1490 nm, and device type selection can be performed according to actual precision requirements and cost requirements. In this embodiment, the first photodetector is capable of detecting wavelengths of 1450 nm. The second photodetector is capable of detecting light having a wavelength within a range of 1645nm to 1665 nm. It should be noted that the wavelength range of the light actually detected by the second photodetector may be larger than the range of 1645nm to 1665nm, for example, 1620nm to 1690nm, and the device type may be selected according to the actual precision requirement and the cost requirement. In this embodiment, the wavelength detectable by the second photodetector is 1663 nm.
In operation, the pulse laser output by the pulse laser 102 is transmitted to the optical fiber 101 through the wavelength division multiplexer 103, and the backward reflected raman scattered light is output from the third port and the fourth port of the wavelength division multiplexer 103, wherein the anti-stokes scattered light is received by the first photodetector 104, and the stokes scattered light is received by the second photodetector 105. Referring to fig. 3 and 4, fig. 3 is a schematic diagram illustrating the relationship between the intensity of stokes scattering light and time; fig. 4 is a graph showing the relationship between the light intensity of anti-stokes scattered light and time. Wherein the time is the time when the detector detects the scattered light or the time from when the pulsed light source 102 outputs the pulsed light source to the time when the detector detects the scattered light. When the optical cable junction box is subjected to water seepage, temperature change can be caused by humidity change in the optical cable junction box, and in the Raman scattering light, the anti-Stokes scattering light is sensitive to temperature, so that the peak value of the anti-Stokes scattering light is influenced by the temperature change; and the location of the cable closure 20 on the optical fiber 101 will affect the time at which the scattered light travels back in the optical fiber, i.e., the location of the peak of the anti-stokes scattered light on the time axis. Therefore, the first photodetector 104 detects the anti-stokes scattered light, and the data acquisition card analyzes the size change of the peak value of the anti-stokes scattered light and the position change of the peak value on the time axis, so that the water seepage of the optical cable junction box can be detected, and the position of the water seepage optical cable junction box can be positioned. The anti-stokes scattered light has higher temperature sensitivity than the stokes scattered light, so the stokes scattered light is detected by the second photoelectric detector 105, and the data acquisition card uses the stokes scattered light as a reference signal for peak demodulation of the anti-stokes scattered light, so that the interference of factors except temperature on the anti-stokes scattered light can be eliminated, and the detection result is more accurate.
In another embodiment, the range of the wavelength of the pulsed laser light output by the pulsed laser 102 may be 1380nm, and the ranges of the wavelengths detectable by the first photodetector 104 and the second photodetector 105 are adjusted accordingly, so that the first photodetector 104 can detect the anti-stokes scattered light and the second photodetector 105 can detect the stokes scattered light.
Optionally, in this embodiment, the system for detecting water seepage of an optical cable splice closure further includes a display unit and an alarm unit. The output end of the data acquisition card is respectively connected with the display unit and the alarm unit. The alarm unit can alarm in the modes of voice, text notification, light and the like.
The system for detecting water seepage of the optical cable splice closure provided by the embodiment monitors the humidity in the optical cable splice closure by using the characteristics of the moisture absorption heating material, and when water seeps into a certain optical cable splice closure distributed on an optical fiber, the moisture absorption heating material contained in the optical cable splice closure dissipates heat after absorbing moisture, so that the water seepage of the optical cable splice closure can be detected by acquiring the temperature of the optical fiber in the optical cable splice closure distributed on the optical fiber through the distributed optical fiber temperature sensor, and the water seeped optical cable splice closure can be positioned through an optical time domain reflection technology. The utility model detects the water seepage of the optical cable splice closure by monitoring the temperature, which hardly causes the loss of optical fiber signals and is beneficial to the improvement of the detection precision; simultaneously, for the way of detecting optical cable splice closure infiltration through the loss variation volume that detects optic fibre, this embodiment has greatly reduced the risk that the probing point revealed, is favorable to realizing long distance distributed detection.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The utility model provides an optical cable splice closure infiltration detecting system which characterized in that includes: a distributed optical fiber temperature sensor; the distributed optical fiber temperature sensor comprises an optical fiber; at least one optical cable splice closure is distributed on the optical fiber; the optical fiber penetrates through the optical cable junction box and is fixedly connected with the optical cable junction box; the water seepage detection system of the optical cable splice closure further comprises a moisture absorption heating material; the moisture absorption heating material is contained in the optical cable connecting box.
2. The cable closure flooding detection system of claim 1 wherein said distributed fiber optic temperature sensor is a distributed fiber raman thermometry sensing system.
3. The fiber optic cable closure water seepage detection system of claim 2, wherein the distributed fiber optic temperature sensor further comprises a pulse laser, a fiber wavelength division multiplexer, a first photodetector, a second photodetector, and a data acquisition card; the optical fiber wavelength division multiplexer comprises a first port, a second port, a third port and a fourth port; the output end of the pulse laser is connected with the first port of the optical fiber wavelength division multiplexer; the second port of the optical fiber wavelength division multiplexer is connected with the optical fiber; a third port of the optical fiber wavelength division multiplexer is connected with the input end of the first photoelectric detector; a fourth port of the optical fiber wavelength division multiplexer is connected with the input end of the second photoelectric detector; the data acquisition card comprises a first input end and a second input end; the first input end of the data acquisition card is connected with the output end of the first photoelectric detector; and the second input end of the data acquisition card is connected with the output end of the second photoelectric detector.
4. The optical cable splice enclosure water seepage detection system of claim 3, wherein the pulsed laser outputs pulsed laser light having a wavelength within a range of 1545 nm-1555 nm; the first photoelectric detector can detect light with a wavelength value range falling within 1445 nm-1465 nm; the second photodetector is capable of detecting light having a wavelength within a range of 1645nm to 1665 nm.
5. The system of claim 1, wherein the hygroscopic exothermic material coats the outer wall of the optical fiber.
6. The system for detecting water seepage of the optical cable splice closure according to claim 1, wherein a material containing box for containing the moisture absorbing and heating material is arranged in the optical cable splice closure; the material containing box is provided with at least one water seepage hole.
7. The system of claim 6, wherein the hygroscopic exothermic material coats the outer wall of the optical fiber; the material containing box is also provided with two through holes for the optical fibers to penetrate through the material containing box.
8. The cable closure flooding detection system of any one of claims 1-7, wherein said optical fiber of said distributed fiber optic temperature sensor is a cable slack fiber.
9. The cable closure flooding detection system of any one of claims 1-7, wherein said optical fiber of said distributed fiber optic temperature sensor is a temperature sensitive optical fiber.
10. The system for detecting water seepage of an optical cable closure according to any one of claims 1 to 7, wherein the hygroscopic exothermic material is calcium chloride, montmorillonite or acrylic fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920892647.8U CN210243096U (en) | 2019-06-14 | 2019-06-14 | Water seepage detection system for optical cable splice closure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920892647.8U CN210243096U (en) | 2019-06-14 | 2019-06-14 | Water seepage detection system for optical cable splice closure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210243096U true CN210243096U (en) | 2020-04-03 |
Family
ID=69974891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920892647.8U Active CN210243096U (en) | 2019-06-14 | 2019-06-14 | Water seepage detection system for optical cable splice closure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210243096U (en) |
-
2019
- 2019-06-14 CN CN201920892647.8U patent/CN210243096U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU760272B2 (en) | Intrinsic securing of fibre optic communication links | |
| CN102759371B (en) | COTDR (coherent detection based optical time-domain reflectometry) fused long-distance coherent detection brilouin optical time-domain analyzer | |
| US7885539B2 (en) | Method for detecting and localizing faults in an optical transmission path, and optical transmission system | |
| CN102292621A (en) | Improvements in distributed fibre optic sensing | |
| CN103017687B (en) | Orthogonal polarization fiber bragg grating vector torsion sensing device and detection method thereof | |
| CN103439766B (en) | A kind of space division multiplexing method of multi-core fiber | |
| KR20010101239A (en) | Apparatus and method for monitoring a structure using a counter-propagating signal method for locating events | |
| CN102809421A (en) | Multi-point localizable distribution-type optical-fiber vibration sensor based on polarization-state differential detection | |
| CN109595470B (en) | Distributed pipeline detection method | |
| WO2008017276A1 (en) | A distributed optical fiber warning and sensing system for oil and gas pipeline | |
| CN102506916B (en) | Distributed sensor network using weak reflection fiber Bragg grating (FBG) and precise positioning method of each FBG | |
| US11346689B2 (en) | Optical measuring system with an interrogator and a polymer-based single-mode fibre-optic sensor system | |
| CN105221936B (en) | A kind of device and its control method of monitoring and positioning directly buried heat distribution pipeline road leakage point | |
| CN103983385B (en) | A kind of method of elliposoidal fibre optic compression sensor and detection fiber fault pressure spot | |
| CN102538945B (en) | Cross-polarization control-based distributed vibration sensing system and method | |
| CN210243096U (en) | Water seepage detection system for optical cable splice closure | |
| CN104729751A (en) | Distributed optical fiber temperature and stress sensor based on Brillouin scattering | |
| CN110243548A (en) | A kind of optical cable connecting box infiltration detection system | |
| US20220412834A1 (en) | Fiber optics sensor for hydrocabon and chemical detection | |
| CN104811241A (en) | Wavelength-tunable optical time domain reflectometer and fiber ring-down cavity sensor array integrated system | |
| CN101526376A (en) | Polarization fiber sensor | |
| CN100397034C (en) | Monitor device for anchorage cable long term working state and its method | |
| KR101698835B1 (en) | Displacement measurement system using optical fiber | |
| CN204988541U (en) | Optical fiber temperature sensor | |
| CN101813496A (en) | Fiber Bragg grating sensor and Raman sensor-fused sensing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210719 Address after: Room 703, No. 553, dongluqiao Avenue, Songtang village, Lubei street, Luqiao District, Taizhou City, Zhejiang Province 318000 Patentee after: Taizhou anqiling Intelligent Technology Co.,Ltd. Address before: 312030 409-410, block B, Kechuang building, No. 586 West Ring Road, Keqiao Economic Development Zone, Keqiao District, Shaoxing City, Zhejiang Province Patentee before: Shaoxing Fiber Sensitive Photoelectric Technology Co.,Ltd. |