CN201569522U - Stress monitoring device based on optical fiber bend loss - Google Patents
Stress monitoring device based on optical fiber bend loss Download PDFInfo
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- CN201569522U CN201569522U CN2009202459990U CN200920245999U CN201569522U CN 201569522 U CN201569522 U CN 201569522U CN 2009202459990 U CN2009202459990 U CN 2009202459990U CN 200920245999 U CN200920245999 U CN 200920245999U CN 201569522 U CN201569522 U CN 201569522U
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- optical fiber
- space bar
- bending loss
- tooth plate
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Abstract
The utility model discloses a stress monitoring device based on optical fiber bend loss, which comprises a test channel for optical fiber to be tested to pass through, an optical fiber bend loss monitoring instrument and a host processor, wherein the test channel comprises a test channel shell as well as a plurality of upper partition boards and a plurality of lower partition boards, the test channel shell correspondingly presses the optical fiber to be tested under the action of external stress, and the upper partition boards and the lower partition boards are longitudinally and correspondingly distributed at the upper side and the lower side of the inside of the test channel shell, the upper and the lower partition boards are distributed in a staggering way, and the head parts of the upper and the lower partition boards form a longitudinal test channel for the optical fiber to be tested to pass through; and the upper partition boards and/or the lower partition boards and the optical fiber to be tested are positioned in the same plane. The utility model has simple structure, convenient use and operation, reasonable connection design of all the components, low manufacturing and operating cost and good use effect, and can effectively solve the defects and deficiencies of complicated structure, inconvenient use and operation, narrow testing range, easy influence on the test results by the surrounding environmental factor and the like in the existing fiber optical sensing monitoring equipment.
Description
Technical field
The utility model relates to a kind of monitor for stress, especially relates to a kind of monitor for stress based on bending loss of optical fiber.
Background technology
The kind of existing fiber sensor is very many, mainly comprise polytypes such as fiber-optic grating sensor, optical fibre interferometric sensor, optical fiber micro-bending sensor, be characterized in the sensing sensitivity height, but in the actual application, there are defective and deficiencies such as equipment complexity, utilization and operation cost height, thereby make the application of Fibre Optical Sensor be very limited.Especially to the Fibre Optical Sensor of higher sensitivity, it can respond the change situation of various environmental baselines in the use, as optical fibre interferometric sensor, because its sensitivity is very high, but after it is applied under the physical condition, find that environmental factors such as temperature, air pressure, vibration all can impact its running parameter, thereby during actual the use, have to take multiple measure to prevent and reject above-mentioned Effect of Environmental, thereby make the structure of its monitoring equipment more and more be tending towards complicated, the operation use cost significantly improves; On the other hand, some places do not need especially accurate equipment in the actual life, and such as whether reach situation such as setting power value following time when needs understanding stress value, above-mentioned monitoring equipment just seems and wasted one's talent on a petty job.In addition, if above-mentioned monitoring equipment is when wanting to reach in a big way stressing conditions, and the complexity of system will significantly improve, and practical application is very difficult.
The utility model content
Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of monitor for stress based on bending loss of optical fiber is provided, it is simple in structure, use is easy and simple to handle and each inter-module annexation is reasonable in design, making and operating cost is low, result of use is good, can effectively solve existing number of drawbacks of existing fiber sensor monitoring equipment and deficiency.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of monitor for stress based on bending loss of optical fiber, it is characterized in that: the bending loss of optical fiber monitoring instrument of comprise the test channel of passing for tested optical fiber, joining with tested optical fiber and according to bending loss of optical fiber monitoring instrument institute test number corresponding reckoning draws the Upper Processor that causes the external carbuncle value that tested optical fiber bends, described bending loss of optical fiber monitoring instrument and Upper Processor join; Described test channel comprise the test channel external shell of the tested optical fiber of corresponding press-bending under the external carbuncle effect and vertically correspondence be laid in described test channel external shell inside a plurality of space bars and a plurality of space bars down gone up of both sides up and down, described go up space bar and play space bar be staggered lay and the two head between form the testing longitudinal passage that supplies tested optical fiber to pass; Last space bar and following space bar correspondence are laid in tested optical fiber both sides up and down.
The described head of going up space bar and following space bar is tabular, zigzag, hemispherical or wooden club shape.
Described test channel external shell comprises lower tooth plate and is laid in last tooth plate directly over the lower tooth plate, described space bar down is laid in the lower tooth plate top, last space bar is laid in the tooth plate bottom, described going up between tooth plate and the lower tooth plate carried out support fixation by the soft support of the elasticity of a plurality of vertical layings, described lower tooth plate, go up tooth plate, down space bar, go up space bar and the soft support of described elasticity is assembled into one.
The cross sectional shape of described lower tooth plate is a U-lag, and last tooth plate is the U-shaped lid that tips upside down on the lower tooth plate.
The described head correspondence that goes up space bar and following space bar is provided with the through hole that passes for tested optical fiber.
The soft elastic support that is supported for spring or makes of described elasticity by sponge or foamed material.
Described bending loss of optical fiber monitoring instrument for respectively with tested optical fiber before and after the end light source and the light power meter that join, described light power meter and Upper Processor join; The quantity of described test channel is one or more.
Light source and the light power meter of described bending loss of optical fiber monitoring instrument for all joining with tested optical fiber leading section, the rearward end of tested optical fiber is connected to catoptron; The quantity of described test channel is one or more.
Described bending loss of optical fiber monitoring instrument is the optical time domain reflectometer that joins with tested optical fiber leading section, and described optical time domain reflectometer and Upper Processor join.
Described tested optical fiber is the outside optical fiber that is surrounded by the multilayer fibers protective seam.
The utility model compared with prior art has the following advantages:
1, simple in structure, processing and fabricating is convenient and version is various, and use-pattern is flexible.
2, use easy and simple to handle and each inter-module annexation is reasonable in design, be used, realize acting force is in a big way carried out in real time accurately, reliably and the purpose of fast monitored by test channel, bending loss of optical fiber monitoring instrument and Upper Processor.
3, making and operating cost are low, result of use good, practical value is high and remarkable in economical benefits, when simplifying existing monitoring device structure, reducing making and operating cost, also can reduce the influence of environmental factor, thereby the test effect is accurate, simple to test result.
In sum, the utility model is simple in structure, use is easy and simple to handle and each inter-module annexation is reasonable in design, making and operating cost is low, result of use is good, can effectively solve the existing complex structure of existing fiber sensor monitoring equipment, uses operation inconvenience, test specification is narrow, test result is subject to number of drawbacks and deficiencies such as surrounding enviroment factor affecting.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is the light path principle figure of the utility model first embodiment.
Fig. 2 is the user mode reference diagram of test channel among Fig. 1.
Fig. 3 is a structural representation of going up space bar and following space bar among Fig. 1.
Fig. 4 is the structural representation of test channel external shell among Fig. 1.
Fig. 5 is the light path principle figure of the utility model second embodiment.
Fig. 6 be go up among Fig. 5 space bar and following space bar structural representation.
Fig. 7 is the light path principle figure of the utility model the 3rd embodiment.
Fig. 8 be go up among Fig. 7 space bar and following space bar structural representation.
Fig. 9 is the light path principle figure of the utility model the 4th embodiment.
Figure 10 is the light path principle figure of the utility model the 5th embodiment.
Figure 11 is the light path principle figure of the utility model the 6th embodiment.
Figure 12 is the light path principle figure of the utility model the 7th embodiment.
Figure 13 is the light path principle figure of the utility model the 8th embodiment.
Figure 14 is a structural representation of going up tooth plate among Figure 13.
Figure 15 is a structural representation of going up space bar among Figure 13.
Figure 16 is the user mode reference diagram of test channel in the utility model the 9th embodiment.
Description of reference numerals:
The tested optical fiber of 1-; The 2-light source; The 3-light power meter;
The 4-test channel; The 4-1-lower tooth plate; The last tooth plate of 4-2-;
Space bar under the 4-3-; The last space bar of 4-4-; The 4-5-spring;
4-6-spiral-lock part; 5-bending loss of optical fiber monitoring instrument; The 6-Upper Processor;
The 7-optical time domain reflectometer; 8-1 * n optical branching device; 9-1 * n optical combiner;
The 10-catoptron; 11-2 * n optical branching device; 12-1 * 2 optical branching devices;
The 13-through hole.
Embodiment
As shown in Figure 1 and Figure 2, the bending loss of optical fiber monitoring instrument 5 that the utility model comprises the test channel 4 of passing for tested optical fiber 1, join with tested optical fiber 1 and according to the bending loss of optical fiber monitoring instrument 5 corresponding reckonings of test number draw the Upper Processor 6 that causes the external carbuncle value that tested optical fiber 1 bends, described bending loss of optical fiber monitoring instrument 5 is joined with Upper Processor 6.Described test channel 4 comprise the test channel external shell of the tested optical fiber 1 of corresponding press-bending under the external carbuncle effect and vertically correspondence be laid in described test channel external shell inside a plurality of space bar 4-4 of going up and a plurality of space bar 4-3 down of both sides up and down, described space bar 4-4 of going up and play space bar 4-3 be staggered lay and the two head between form the testing longitudinal passage that supplies tested optical fiber 1 to pass.Described upward space bar 4-4 and following space bar 4-3 correspondence are laid in tested optical fiber, and about in the of 1 both sides.Described tested optical fiber 1 is the outside optical fiber that is surrounded by the multilayer fibers protective seam.
Described test channel external shell comprises lower tooth plate 4-1 and is laid in last tooth plate 4-2 directly over the lower tooth plate 4-1, described space bar 4-3 down is laid in lower tooth plate 4-1 top, last space bar 4-4 is laid in tooth plate 4-2 bottom, described going up between tooth plate 4-2 and the lower tooth plate 4-1 carried out support fixation by the soft support of the elasticity of a plurality of vertical layings, described lower tooth plate 4-1, go up tooth plate 4-2, down space bar 4-3, go up space bar 4-4 and the soft support of described elasticity is assembled into one.The soft elastic support that is supported for spring 4-5 or makes of described elasticity by sponge or foamed material.In the present embodiment, the soft spring 4-5 that is supported for of described elasticity.
In conjunction with Fig. 3, Fig. 4, in the present embodiment, the described head of going up space bar 4-4 and following space bar 4-3 is tabular, and the cross sectional shape of described lower tooth plate 4-1 is a U-lag, and last tooth plate 4-2 is the U-shaped lid that tips upside down on the lower tooth plate 4-1.Light source 2 and the light power meter 3 of described bending loss of optical fiber monitoring instrument 5 for joining with end, tested optical fiber 1 front and back respectively, described light power meter 3 joins with Upper Processor 6.In the present embodiment, the quantity of described test channel 4 is one.
In the actual use, under the normal operation, described U-shaped covers be supported on lower tooth plate 4-1 by spring 4-5 directly over and tested optical fiber 1 continues to pass through the inner testing longitudinal passage from it; When the resiliency supported effect that is subjected to overcoming under the external carbuncle effect spring 4-5 when U-shaped lid is bent downwardly, is installed in last space bar 4-4 that U-shaped covers and covers with described U-shaped and move downward together and make tested optical fiber 1 corresponding site be bent downwardly; The tested reclinate while of optical fiber 1 corresponding site, the output power P of 3 pairs of tested optical fiber 1 of light power meter
OutCarry out synchronism detection (this output power P
OutCorresponding power input is P
In), and with measured output power P
OutSend into Upper Processor 6; Described Upper Processor 6 is according to formula P
Out=P
InExp (rs) and with differently curved length and the corresponding bending loss coefficient of bending radius, can calculate to draw the size that described U-shaped covers suffered external carbuncle P in the formula
OutBe the output power of tested optical fiber 1, P
InBe the power input of tested optical fiber 1, r is the bending loss coefficient, and s is a bending length.
In the actual processing and making process, also lower tooth plate 4-1 can be made as removable cover, in like manner match to use and realize the external carbuncle size that acts on lower tooth plate 4-1 is monitored by light source 2 and light power meter 3; Simultaneously, also can be according to the concrete needs of reality, will go up space bar 4-4 and following space bar 4-3 and be made as other shapes such as zigzag, hemispherical or wooden club shape.
As Fig. 5, shown in Figure 6, in the present embodiment, as different from Example 1: the described head of going up space bar 4-4 and following space bar 4-3 is a zigzag; And the quantity of described test channel 4 is a plurality of, the quantity of described light power meter 3 is a plurality of, and the rearward end of the many velamens measuring fiber 1 that passes is joined with a plurality of light power meters 3 respectively in a plurality of test channel 4, be connected by 1 * n optical branching device 8 between the leading section of described many velamens measuring fiber 1 and the light source 2, the quantity of test channel 4 and light power meter 3 is n.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As Fig. 7, shown in Figure 8, in the present embodiment, as different from Example 1: the described head of going up space bar 4-4 and following space bar 4-3 is the wooden club shape; And the quantity of described test channel 4 is a plurality of, the quantity of described light power meter 3 is one, and the rearward end of the many velamens measuring fiber 1 that passes is joined with light power meter 3 respectively in a plurality of test channel 4, be connected by 1 * n optical branching device 8 between the leading section of described many velamens measuring fiber 1 and the light source 2, be connected by 1 * n optical combiner 9 between the leading section of many velamens measuring fiber 1 and the light power meter 3; N is the quantity of test channel 4.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As shown in Figure 9, in the present embodiment, as different from Example 1: light source 2 and the light power meter 3 of described bending loss of optical fiber monitoring instrument 5 for all joining with tested optical fiber 1 leading section, the rearward end of tested optical fiber 1 is connected to catoptron 10, is connected by 1 * 2 optical branching device 12 between the leading section of described light source 2 and light power meter 3 and tested optical fiber 1.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As shown in figure 10, in the present embodiment, as different from Example 4: the quantity of described test channel 4 is a plurality of; The quantity of described catoptron 10 is a plurality of, and the rearward end of the many velamens measuring fiber 1 that passes is joined with a plurality of catoptrons 10 respectively in a plurality of test channel 4, be connected by 2 * n optical branching device 11 between the leading section of described many velamens measuring fiber 1 and light source 2 and the light power meter 3, the quantity of test channel 4 and catoptron 10 is n, and the quantity of light power meter 3 is one.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 4.
As shown in figure 11, in the present embodiment, as different from Example 4: the quantity of described test channel 4 is a plurality of; The quantity of described catoptron 10 is one, and the rearward end of the many velamens measuring fiber 1 that passes is all joined with catoptron 10 in a plurality of test channel 4, be connected by 2 * n optical branching device 11 between the leading section of described many velamens measuring fiber 1 and light source 2 and the light power meter 3, be connected by 1 * n optical combiner 9 between the leading section of described many velamens measuring fiber 1 and the catoptron 10.The quantity of described test channel 4 is n, and the quantity of light power meter 3 and catoptron 10 is one.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 4.
As shown in figure 12, in the present embodiment, as different from Example 1: described bending loss of optical fiber monitoring instrument 5 is the optical time domain reflectometer 7 that joins with tested optical fiber 1 leading section, and described optical time domain reflectometer 7 joins with Upper Processor 6; Correspondingly, in the actual use, match by optical time domain reflectometer 7 and Upper Processor 6 and to use external carbuncle size to monitor acting on the U-shaped lid.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As Figure 13, Figure 14 and shown in Figure 15, in the present embodiment, as different from Example 7: the quantity of described test channel 4 is a plurality of; The quantity of described test channel 4 is a plurality of, and the leading section of the many velamens measuring fiber 1 that passes all joins by 1 * n optical branching device 8 and optical time domain reflectometer 7 in a plurality of test channel 4, and n is the quantity of test channel 4; The cross sectional shape of described lower tooth plate 4-1 and last tooth plate 4-2 is a U-shaped, and lower tooth plate 4-1 and last tooth plate 4-2 inside are respectively arranged with the spiral-lock part 4-6 that keeps supplying space bar 4-4 and following space bar 4-3 installation, described spiral-lock part 4-6 and lower tooth plate 4-1 or last tooth plate 4-2 processing and fabricating are one, can realize one-shot forming, and upward space bar 4-4 is inserted into respectively on lower tooth plate 4-1 and the last tooth plate 4-2 by spiral-lock part 4-6 with following space bar 4-3; The described head correspondence that goes up space bar 4-4 and following space bar 4-3 is provided with the through hole 13 that passes for tested optical fiber 1.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 7.
As shown in figure 16, in the present embodiment, as different from Example 1: the described head correspondence that goes up space bar 4-4 and play space bar 4-3 is provided with the through hole 13 that passes for tested optical fiber 1, and goes up the through hole of being offered on space bar 4-4 and the following space bar 4-3 13 and be located along the same line.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection domain of technical solutions of the utility model according to the utility model technical spirit.
Claims (10)
1. monitor for stress based on bending loss of optical fiber, it is characterized in that: comprise the bending loss of optical fiber monitoring instrument (5) of joining for tested optical fiber (1) test channel (4) of passing, with tested optical fiber (1) and corresponding reckoning draws the Upper Processor (6) that causes the external carbuncle value that tested optical fiber (1) bends according to bending loss of optical fiber monitoring instrument (5) institute's test number, described bending loss of optical fiber monitoring instrument (5) is joined with Upper Processor (6); Described test channel (4) comprise the test channel external shell of the tested optical fiber of corresponding press-bending (1) under the external carbuncle effect and vertically correspondence be laid in described test channel external shell inside a plurality of space bars (4-4) and a plurality of space bars (4-3) down gone up of both sides up and down, describedly go up space bar (4-4) and play space bar (4-3) is the testing longitudinal passage that formation supplies tested optical fiber (1) to pass between staggered laying and the head of the two; Last space bar (4-4) and following space bar (4-3) correspondence are laid in tested optical fiber (1) both sides up and down.
2. according to the described a kind of monitor for stress based on bending loss of optical fiber of claim 1, it is characterized in that: the described head of going up space bar (4-4) and following space bar (4-3) is tabular, zigzag, hemispherical or wooden club shape.
3. according to claim 1 or 2 described a kind of monitor for stress based on bending loss of optical fiber, it is characterized in that: described test channel external shell comprises lower tooth plate (4-1) and is laid in last tooth plate (4-2) directly over the lower tooth plate (4-1), described space bar (4-3) down is laid in lower tooth plate (4-1) top, last space bar (4-4) is laid in tooth plate (4-2) bottom, described going up between tooth plate (4-2) and the lower tooth plate (4-1) carried out support fixation by the soft support of the elasticity of a plurality of vertical layings, described lower tooth plate (4-1), last tooth plate (4-2), following space bar (4-3), last space bar (4-4) and the soft support of described elasticity are assembled into one.
4. according to the described a kind of monitor for stress based on bending loss of optical fiber of claim 3, it is characterized in that: the cross sectional shape of described lower tooth plate (4-1) is a U-lag, and last tooth plate (4-2) is for tipping upside down on the U-shaped lid on the lower tooth plate (4-1).
5. according to claim 1 or 2 described a kind of monitor for stress based on bending loss of optical fiber, it is characterized in that: the described head correspondence that goes up space bar (4-4) and following space bar (4-3) is provided with the through hole (13) that passes for tested optical fiber (1).
6. according to the described a kind of monitor for stress of claim 3, it is characterized in that: the soft elastic support that is supported for spring (4-5) or makes of described elasticity by sponge or foamed material based on bending loss of optical fiber.
7. according to claim 1 or 2 described a kind of monitor for stress based on bending loss of optical fiber, it is characterized in that: described bending loss of optical fiber monitoring instrument (5) for respectively with tested optical fiber (1) before and after the end light source (2) and the light power meter (3) that join, described light power meter (3) and Upper Processor (6) join; The quantity of described test channel (4) is one or more.
8. according to claim 1 or 2 described a kind of monitor for stress based on bending loss of optical fiber, it is characterized in that: light source (2) and the light power meter (3) of described bending loss of optical fiber monitoring instrument (5) for all joining with tested optical fiber (1) leading section, the rearward end of tested optical fiber (1) is connected to catoptron (10); The quantity of described test channel (4) is one or more.
9. according to claim 1 or 2 described a kind of monitor for stress based on bending loss of optical fiber, it is characterized in that: described bending loss of optical fiber monitoring instrument (5) is the optical time domain reflectometer (7) that joins with tested optical fiber (1) leading section, and described optical time domain reflectometer (7) joins with Upper Processor (6).
10. according to claim 1 or 2 described a kind of monitor for stress based on bending loss of optical fiber, it is characterized in that: described tested optical fiber (1) is the outside optical fiber that is surrounded by the multilayer fibers protective seam.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202459990U CN201569522U (en) | 2009-12-25 | 2009-12-25 | Stress monitoring device based on optical fiber bend loss |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202459990U CN201569522U (en) | 2009-12-25 | 2009-12-25 | Stress monitoring device based on optical fiber bend loss |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102956083A (en) * | 2011-08-29 | 2013-03-06 | 北京深蓝同创科技有限公司 | Invasion detection system |
| CN104913907A (en) * | 2015-05-29 | 2015-09-16 | 成都亨通光通信有限公司 | Optical fiber bending disturbance device |
| CN104913906A (en) * | 2015-05-29 | 2015-09-16 | 成都亨通光通信有限公司 | Optical fiber bending loss determination system |
| CN104913905A (en) * | 2015-05-29 | 2015-09-16 | 成都亨通光通信有限公司 | Optical fiber bending loss determination method |
| CN106198207A (en) * | 2016-06-16 | 2016-12-07 | 江苏亨通光纤科技有限公司 | A kind of pressure performance test methods of fibre coating and measurement apparatus thereof |
| CN108548658A (en) * | 2018-01-23 | 2018-09-18 | 电子科技大学 | A kind of method of monofilm optical element stress and optical loss measurement simultaneously |
| CN111486880A (en) * | 2020-04-07 | 2020-08-04 | 南京航空航天大学 | Molding self-monitoring intelligent composite material and monitoring method thereof |
| CN112082733A (en) * | 2020-08-31 | 2020-12-15 | 成都泰瑞通信设备检测有限公司 | Non-pressure optical fiber microbend additional loss testing device, testing system and testing method |
-
2009
- 2009-12-25 CN CN2009202459990U patent/CN201569522U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102956083A (en) * | 2011-08-29 | 2013-03-06 | 北京深蓝同创科技有限公司 | Invasion detection system |
| CN102956083B (en) * | 2011-08-29 | 2014-10-15 | 北京深蓝同创科技有限公司 | Invasion detection system |
| CN104913907A (en) * | 2015-05-29 | 2015-09-16 | 成都亨通光通信有限公司 | Optical fiber bending disturbance device |
| CN104913906A (en) * | 2015-05-29 | 2015-09-16 | 成都亨通光通信有限公司 | Optical fiber bending loss determination system |
| CN104913905A (en) * | 2015-05-29 | 2015-09-16 | 成都亨通光通信有限公司 | Optical fiber bending loss determination method |
| CN106198207A (en) * | 2016-06-16 | 2016-12-07 | 江苏亨通光纤科技有限公司 | A kind of pressure performance test methods of fibre coating and measurement apparatus thereof |
| CN108548658A (en) * | 2018-01-23 | 2018-09-18 | 电子科技大学 | A kind of method of monofilm optical element stress and optical loss measurement simultaneously |
| CN111486880A (en) * | 2020-04-07 | 2020-08-04 | 南京航空航天大学 | Molding self-monitoring intelligent composite material and monitoring method thereof |
| CN112082733A (en) * | 2020-08-31 | 2020-12-15 | 成都泰瑞通信设备检测有限公司 | Non-pressure optical fiber microbend additional loss testing device, testing system and testing method |
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Granted publication date: 20100901 Termination date: 20111225 |