CN2725890Y - Apparatus for testing optical fiber quality - Google Patents
Apparatus for testing optical fiber quality Download PDFInfo
- Publication number
- CN2725890Y CN2725890Y CN 200420053187 CN200420053187U CN2725890Y CN 2725890 Y CN2725890 Y CN 2725890Y CN 200420053187 CN200420053187 CN 200420053187 CN 200420053187 U CN200420053187 U CN 200420053187U CN 2725890 Y CN2725890 Y CN 2725890Y
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- optical fiber
- fiber quality
- lens
- detection fiber
- optical system
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Abstract
The utility model relates to an apparatus for testing optical fiber quality, comprising an optical system in which a laser forms bar shape light beams, optical fiber positioned at a focal surface and a viewing screen located behind the focal surface, a CCD photographic camera and a computer containing accounting routine connected by conductors. The optical fiber is placed on a regulating supporter, and the shaft is parallel to the shaft of the cylindrical lens in accordance or coincidence with the optical system and laser beams coaxial optic philosophy and other relative optic philosophies. Considering to the physical circumstance of the in-line testing, a photoelectric alarm can be electrically connected with the computer. The optical system of forming bar shape light beams is composed of a concave lens, a convex glass and a cylindrical lens; the front focuses of the concave lens and the convex glass are coincident, and the bar shape light beam irradiates and covers the middle part of the optical fiber in technique. The utility model with the construction has a simple device, high sensibility, precision and degree of automation and fast speeds, and is a non-contact and non-destructive testing apparatus.
Description
Technical field
Based on the device of a kind of detection fiber quality of interference of light, belong to the optical fiber detection range.
Background technology
Optical fiber has been widely used in fields such as communication, sensor, medical treatment, military affairs at present.Along with fiber optic applications is increasingly extensive, in some fields (as military, medical treatment) quality of optical fiber is had higher requirement.
Optical fiber generally is made of fibre core, covering and the coat that shields.In process of production, be easy to generate defectives such as bubble, delamination, constriction and breach.When light transmitted in optical fiber, these defectives played the effect of scattering center, can increase the loss of optical fiber.The defective that is present in step index optical fiber between fibre core and covering interface is harmful especially, they can cause coupling attenuation, make guided mode become non-guided mode, thereby influence the transmission quality of light in optical fiber, the existence of these defectives simultaneously also can make the physical strength variation of optical fiber.
Present detection method has microscopic examination method, optic-electronic hybrid joint transform method, transmits that neural network method, online picnometer, off-line optics are relatively counted dorsad, online perspective photographic process etc., these methods respectively have relative merits: microscopic examination method precision height simple to operate, but be difficult to bear the vibration of optical fiber, the microscope focal length is very short in addition, the visual field is limited, and measuring speed is very slow; The optic-electronic hybrid joint transform method is flexible, and light path is easily adjusted, and is 4mm but shortcoming is the length of each detection fiber, and comparatively speaking, detection speed is slow; Chuan Shu neural network method is to develop from the optic-electronic hybrid joint transform method dorsad, and measurement mechanism is identical with optic-electronic hybrid joint transform, and its shortcoming is the same; Online picnometer, off-line optics are relatively counted, online perspective photographic process all is used to measure or calculate fiber size.Some defectives of optical fiber can be measured by the measurement of diameter as breach and constriction, but other defectives then can not detect with this way as air bubble.Therefore seek a kind of non-contacting, fast, online optical fiber tiny flaw detection method is extremely important.
Summary of the invention
The purpose of this utility model is to overcome the deficiency of prior art, provides that a kind of manufacture craft is simple, with low cost, speed is fast, the device of highly sensitive, non-contacting measuring optical fiber quality.
For the ease of understanding, it is necessary sketching measuring principle of the present utility model.The utility model adopts laser instrument as light source, spatial alternation by light beam forms the bar shaped light beam irradiation and covers one section optical fiber of several centimetres, light beam and the light beam interference of passing through inside of optical fibre by the optical fiber upper and lower, form the visible interference fringe of human eye, this interference fringe is relevant with optical fibre refractivity.Optical fiber is a kind of coaxial columnar structure of variations in refractive index of multilayer, to its interference fringe of up-to-standard standard fiber is regular, but in sample optical fiber one deck, there is defective, the refractive index of defective is different with the refractive index of fiber medium, and the light path of the light path when promptly light is by defect layer when not having defective is different.According to the interference of light principle, the interference fringe of sample optical fiber can be different with the standard fiber interference fringe, thereby interference fringe is distorted.Take the interference fringe image of standard fiber when measuring earlier with high precision CCD camera based on this, and then the interference fringe image of shooting testing fiber, in computing machine, use based on the difference between the two image of method comparison of Gabor filtering, and differentiate the optical fiber acceptance or rejection automatically by the computing machine that contains software program.
The utility model reaches the computing machine that contains calculation procedure that links to each other with lead by laser instrument at the interior optical system that forms bar shaped light beam, the optical fiber that is in the focal plane and subsequent film viewing screen, CCD camera and forms, and optical fiber is placed on to be regulated on the support, its axle with cylindrical lens is parallel, and keeps or meet relevant optical principles such as optical system and laser beam be coaxial.Consider the concrete condition of online detection, also can be connected a photoelectric alarm with aforementioned calculation electromechanics.
The optical system of above-mentioned formation bar shaped light beam is made up of concavees lens, convex lens and cylindrical lens, and concavees lens overlap with the convex lens front focus, guarantee the bar shaped light beam irradiation technically and cover optical fiber middle part 4-8cm to be advisable, rather than a light pencil is radiated on the particular point of optical fiber, and this also is one of this apparatus features.
Device is simple, highly sensitive, precision is high, automaticity is high, fireballing advantage for the utlity model has of constructing thus, and is a kind of non-contacting, nondestructive measurement mechanism.
Description of drawings
Fig. 1 is a general structure synoptic diagram of the present utility model.
Fig. 2 is a structural parameters synoptic diagram of the present utility model.
Fig. 3 is a measurement schematic flow sheet of the present utility model.
1 laser instrument wherein; 2 concavees lens; 3 convex lens; 4 cylindrical lenses; 5 optical fiber; 6 supports; 7 film viewing screens; 8 casings; 9 cameras; 10 computing machines; 11 alarms.
Embodiment
As accompanying drawing 1, shown in Figure 2, the utility model by laser instrument 1 the interior optical system that forms bar shaped light beam, be in the focal plane optical fiber 5 and after film viewing screen 7, CCD camera 9 and the computing machine that contains calculation procedure 10 that links to each other with lead form, and optical fiber 5 is placed on the adjusting support 6, the axle of optical fiber is parallel with the axle of cylindrical lens, and maintenance optical system and laser beam is coaxial.
The optical system of above-mentioned formation bar shaped light beam is made up of concavees lens 2, convex lens 3 and cylindrical lens 4, and concavees lens 2 overlap with convex lens 3 front focus, guarantees the bar shaped light beam irradiation technically and covers on the optical fiber.For dwindling whole device size, convex lens 3 can replace with plano-convex lens, and this moment, it was close to cylindrical lens, as shown in Figure 1.
As Fig. 2, the focal length of above-mentioned concavees lens 2 is f
1, the focal length of convex lens 3 is f
2, concavees lens 2 overlap with the front focus of convex lens 3, and focal length is at f
3The adjacent convex lens 3 of cylindrical lens 4 place.Optical fiber is placed on the adjusting support, and the axle of optical fiber is parallel with the axle of cylindrical lens 4, and on the focal plane of cylindrical lens 4.Film viewing screen 7 is a translucent screen.For eliminating parasitic light, concavees lens 2, convex lens 3, cylindrical lens 4, optical fiber adjusting bracket 6 and film viewing screen 7 can be fixed in the casing 8.The two sides vertical with optical fiber of casing 8 have the hole (figure omits) that optical fiber is passed, so that pass or place optical fiber.The light beam that laser instrument sends forms the bar shaped light beam of irradiation and covering optical fiber 5 by the center of all optical components among Fig. 1 behind concavees lens 2, convex lens 3 and cylindrical lens 4.The axle of cylindrical lens parallels with the axle of optical fiber.After optical fiber, place a film viewing screen 7, observe interference fringe clearly, the idiographic flow of its software program is as follows: (1) takes the interference fringe image of standard fiber earlier with high precision CCD camera, generate 8 width of cloth characteristic images of standard interference striped by Gabor filtering, according to the characteristic of standard interference striped its image and characteristic image are carried out Region Segmentation then, extracting the overall situation and the local feature of interference fringe, the structural attitude vector also is stored in the computing machine use for relatively the time; (2) and then take the interference fringe image of testing fiber, interference fringe image for testing fiber, use same Gabor filtering method and generate 8 width of cloth characteristic images, the Region Segmentation of reference standard interference fringe image is cut apart characteristic image then, and the generating feature vector is also preserved; (3) difference between the Euclidean distance of standard of comparison and testing fiber interference fringe image proper vector, when both difference during greater than pre-set threshold, computing machine shows that then testing fiber is defective, or alarm gives a warning simultaneously, as the two difference smaller or equal to threshold value, then testing fiber is qualified, and detection is proceeded.
Above-mentioned laser instrument 1 can be with continuous power output semiconductor laser, gas or the solid state laser of sending out visible light, as the He-Ne laser instrument; The suitable semiconductor laser of power particularly, it is little, in light weight to have a volume, can make portable device; The optional usefulness of CCD camera has GAMMA debugging functions, high-precision being advisable.
During measurement, as long as be placed on testing fiber on the support or make online optical fiber pass corresponding position, be stored in the computing machine with its interference fringe of CCD camera and with it, with the program Euclidean distance of testing fiber and standard fiber relatively that is stored in the computing machine, as the threshold value of Euclidean distance greater than setting, computing machine shows that optical fiber exists defective off quality so, simultaneously alarm equipment alarm.Just can declare the clear zero defect that goes out to have.
Claims (8)
- The device of 1 one kinds of detection fiber quality, it is characterized in that it is made up of at the interior optical system that forms bar shaped light beam, the computing machine (10) that is in optical fiber (5) and subsequent film viewing screen (6) and the CCD camera (9) on the focal plane and contains calculation procedure laser instrument (1), and keep optical system and laser beam coaxial.
- The device of 2 detection fiber quality as claimed in claim 1, the optical system that it is characterized in that above-mentioned formation bar shaped light beam is by concavees lens (2), convex lens (3) and cylindrical lens (4) are formed, and concavees lens (2) overlap with the front focus of convex lens (3), and bar shaped light beam irradiation and covering on the optical fiber (5).
- The device of 3 detection fiber quality as claimed in claim 2 is characterized in that can being fixed in above-mentioned concavees lens (2), convex lens (3), cylindrical lens (4), adjusting support (6) and film viewing screen (7) in the casing (8) and still keeping coaxial relation.
- 4 devices as claim 2 or 3 described detection fiber quality is characterized in that the available plano-convex lens of above-mentioned convex lens (3) replaces.
- The device of 5 detection fiber quality as claimed in claim 1 is characterized in that the output terminal of aforementioned calculation machine (10) is electrically connected with a photoelectric alarm (11).
- The device of 6 detection fiber quality as claimed in claim 1 is characterized in that above-mentioned film viewing screen (7) is a translucent screen.
- The device of 7 detection fiber quality as claimed in claim 1 is characterized in that above-mentioned laser instrument (1) is the semiconductor laser of sending out visible light of continuous power output.
- The device of 8 detection fiber quality as claimed in claim 1 is characterized in that above-mentioned laser instrument (1) is the gas or the solid state laser of sending out visible light of continuous power output, as the He-Ne laser instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420053187 CN2725890Y (en) | 2004-08-28 | 2004-08-28 | Apparatus for testing optical fiber quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420053187 CN2725890Y (en) | 2004-08-28 | 2004-08-28 | Apparatus for testing optical fiber quality |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2725890Y true CN2725890Y (en) | 2005-09-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420053187 Expired - Fee Related CN2725890Y (en) | 2004-08-28 | 2004-08-28 | Apparatus for testing optical fiber quality |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2725890Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100344959C (en) * | 2004-08-28 | 2007-10-24 | 中国海洋大学 | Device and method for checking quality of fibre-optical |
| CN111964872A (en) * | 2020-07-08 | 2020-11-20 | 暨南大学 | Optical fiber axial nondestructive online detection device and method |
-
2004
- 2004-08-28 CN CN 200420053187 patent/CN2725890Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100344959C (en) * | 2004-08-28 | 2007-10-24 | 中国海洋大学 | Device and method for checking quality of fibre-optical |
| CN111964872A (en) * | 2020-07-08 | 2020-11-20 | 暨南大学 | Optical fiber axial nondestructive online detection device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |