CN104019757B - A kind of fiber array fibre core is away from precision measurement method and system - Google Patents
A kind of fiber array fibre core is away from precision measurement method and system Download PDFInfo
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- CN104019757B CN104019757B CN201410230896.2A CN201410230896A CN104019757B CN 104019757 B CN104019757 B CN 104019757B CN 201410230896 A CN201410230896 A CN 201410230896A CN 104019757 B CN104019757 B CN 104019757B
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Abstract
The present invention provides a kind of fiber array fibre core away from precision measurement method and system, wherein, methods described includes：Demarcated using default calibrating template, obtain error；By default measurement module, the tested optical fiber array end view drawing picture is gathered, the measurement module is corresponding with the tested optical fiber array end face to be fixed on moveable workbench, have source light in the optical fiber of the fiber array in conduction；According to the measurement module, according to default algorithm, the multiple image of collection is subjected to splicing recovery in order, and it handled, the image after being handled, according to the image after the processing and the error, fibre core position is calculated.The present invention can effectively improve precision of the fiber array fibre core away from measurement in the case where not improving cost.
Description
Technical field
The present invention relates to field of measuring technique, more particularly to a kind of fiber array fibre core is away from precision measurement method and system.
Background technology
Fiber array is that most widely used device is connected between optics and optical fiber in optical fiber telecommunications system, mainly should
Used in planar optical waveguide device, LD/PD array fibres device, array waveguide grating optical communication net, dense wave division multipurpose and many
In passage micro-optics module, with flexibility pass as, using spatial degrees of freedom it is big, easily realize slim-lined construction, it is lightweight the features such as.Light
Fibre array has the fibre core of 125 μm, 127 μm, 250 μm three types away from port number has 1,2,4,8,16,32,64 etc., at most reachable
128 port numbers.Due to manufacture and rigging error, it is not strict equidistant that optical fiber can be caused, which to be placed on arrangement in V-groove,.To application
The accurate connection of fiber array and optical element can be realized in each field, the fibre core site error of fiber array is to cause coupling
Close the key factor of loss.Therefore, in order to realize the accurate connection of fiber array and optical element, reduce to greatest extent
Coupling loss, improves the alignment precision in coupling process, very necessary to the Precision measurement of fiber array fibre core position.
Being presently used for carrying out the method and system of fiber array fibre core position measurement substantially has following several.
A kind of metering system is manual measurement, that is to say, that manual observation microscope, the mobile work for being clamped with fiber array
Make platform, fibre core is alignd with Target Center, then the actual relative number between the feedback data reading fibre core for passing through workbench grating scale
Value.But this measuring method efficiency is low, measurement result, than more serious, the need for meeting mass production, is reduced by man's activity
Cost simultaneously improves production efficiency, it is necessary to develop noncontact, high-precision automated fiber optic array pitch measuring apparatus.
The measurement accuracy of other several measuring methods is higher, and one kind is relative measurement method, and detailed process is to be fixed on pressure
Standard fiber array on electric regulator does the rotary motion of high speed, coupling overlapping with tested sample array fibre core, measures rotation
The fiber coupling parameter of movable property life is transported, so as to obtain offset distance and the offset direction of fiber array fibre core.It is another to be, lead to
Cross white light source and be transmitted to fiber array (FA), near field mode (NFP) optical profilometer can observe FA center, NFP optics
Contourgraph will search the cluster center of each fiber optic hub coordinate by monitoring process.The several method measurement accuracy is high, consumption
When it is short, but they have the shortcomings that one it is common, be exactly that measuring apparatus is sufficiently expensive, for many R＆D institutions, universities and colleges of mechanism
And some enterprises, want to buy a set of measuring apparatus and carry out related measuring study, be a very difficult thing.
Still an alternative is that, referred to, obtained by image identifying and processing using an accurate fiber array template
To the fibre core coordinate value and the apex coordinate of V-groove of fiber array, the fibre core position for obtaining fiber array is calculated by computer
Put the summit distribution map of distribution map and V-groove.This method does not need submicron order high-precision linear delivery platform, it is relative and
Speech, the measuring system is more compact, and price is also than less expensive, but because this method is not demarcated to its measuring system, and
Also multiple image is carried out in measuring method also to aid in the correlation of splicing to set really in the step of splicing is restored, measurement module
Put, therefore its measurement accuracy is relatively low.
In summary, existing measuring method and system, some e measurement technology precision are relatively low, and the high e measurement technology of precision
System complex, and expensive again.Therefore, be badly in need of working out now simplify, economic, high-precision measurement fiber array fibre core position
The method and system put.
The content of the invention
In view of this, the present invention provides a kind of fiber array fibre core away from precision measurement method, and methods described includes：
Step A, is demarcated using default calibrating template, so as to obtain systematic error；
Step B, by default measurement module, gathers the tested optical fiber array end view drawing picture, the measurement module with
The tested optical fiber array end face correspondence is fixed on moveable workbench, has source light in the optical fiber of the fiber array
In conduction, the image gathered first includes at least two fibre cores, mobile work platform, then gathers the tested optical fiber array end view drawing
Picture, the image gathered again includes at least two fibre cores, and at least one fibre core is the fibre in last acquired image
One of core, continues to press equidirectional mobile work platform, the process of repeated acquisition image, until the whole tested optical fiber array end face
It is collected to finish；
Step C, according to the measurement module, according to default algorithm, the multiple image of collection is spliced in order
Restore, and it is handled, the image after being handled, according to the image after the processing and the systematic error, calculated
Fibre core position..
The present invention also provides a kind of fiber array fibre core away from precision measurement system, and the system includes：
Calibrating template, the error for micro- amplification module in calibration system；
Measurement module, for being placed in the position corresponding with tested optical fiber array end face；
Workbench, for fixed placement tested optical fiber array, and can drive tested optical fiber array to move；
Image capture module, for by light source, collection to be superimposed the tested optical fiber array end view drawing of measurement module
Picture, the image gathered first includes at least two fibre cores, and after mobile work platform, the tested optical fiber array end face is gathered again
Image, the image gathered again includes at least two fibre cores, and at least one fibre core is in last acquired image
One of fibre core, after mobile work platform at same direction is continued, repeats the process of described image collection, until whole described tested
Fiber array end face is collected to be finished；
Image processing module, for according to the measurement module, according to default algorithm, by the multiple image of collection by suitable
Sequence carries out splicing recovery, and it is handled, and calculates fibre core position.
The technical scheme that the present invention is provided, can effectively reduce fiber array fibre core away from measurement cost, while can also
Ensure its higher measurement accuracy.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the fiber array fibre core away from precision measurement method that the present invention is provided.
Fig. 2 is a kind of structural representation for calibrating template that the present invention is provided.
Fig. 3 is a kind of flow chart demarcated using calibrating template to image capture device that the present invention is provided.
Fig. 4 is a kind of measurement module structural representation that the present invention is provided.
Fig. 5 A are schematic diagrames when deviation occurs for a kind of front and rear two images position that the present invention is provided.
Fig. 5 B be the present invention provide it is a kind of before and after two images position zero deflection when schematic diagram.
Fig. 6 is another measurement module structural representation that the present invention is provided.
Fig. 7 is a kind of schematic diagram of the fiber array fibre core away from precision measurement apparatus that the present invention is provided.
Fig. 8 A are a kind of schematic diagrames for two images positional fault that the present invention is provided.
Fig. 8 B are a kind of correct schematic diagrames in two images position that the present invention is provided.
Fig. 9 is a kind of structural representation for measurement module that prior art is provided.
Figure 10 be a kind of calculating fibre core for providing of the present invention away from image processing algorithm flow chart.
Figure 11 is a kind of treated micro- enlarged drawing of fiber array end face that the present invention is provided.
Figure 12 is a kind of fiber array fibre core of the invention provided away from precision measurement system schematic diagram.
Embodiment
In order that the above objects, features and advantages of the present invention can be more obvious understandable, below in conjunction with the accompanying drawings and specifically
The present invention is further detailed explanation for embodiment.
Embodiment of the method：
Fig. 1 is refer to, the figure shows the flow that the present invention carries out embodiment of the method for the fiber array fibre core away from measurement, sheet
Embodiment may comprise steps of.
Step 101, demarcated using default calibrating template, so as to obtain error.
Why the demarcating module, for the tailored template for demarcation, will use calibrating template, obtain first since demarcation
Talk about.
Demarcation is generally referred to, and the degree of accuracy (precision) to used instrument is detected, so that it is determined that instrument or measurement system
Input-output relation of system, assigns instrument or measuring system scale division value；Determine the static characteristic index of instrument or measuring system；
Systematic error is eliminated, improves the accuracy of instrument or system.Therefore, in scientific measurement, demarcation is a weight that can not be ignored
Want step.Tested optical fiber array end face is amplified because the technical scheme that the present invention is provided need to be utilized, then gathers amplification
Image, so before carrying out the measurements, need first to demarcate the device for carrying out micro- amplification, and calibrating template is exactly for demarcation
And a kind of special device, as shown in Figure 2.
Fig. 3 is refer to, the process demarcated using calibrating template may comprise steps of:
Step 201, calibrating template is positioned over before image capture device.
Under normal circumstances, calibrating template can be positioned over before image capture device so that the geometric figure on calibrating template can
To be clearly showed that on the image collected.
Step 202, the image of calibrating template is gathered.
In order to obtain the correlated error parameter of the measuring system, the image of calibrating template need to be gathered, by being adopted
Geometric figure on the image of collection determines error parameter with the difference of actual demarcation round dot, specific determination error parameter
Process, in subsequent step, can be further illustrated.
Step 203, the geometric figure in image is detected.
After the image for having gathered calibrating template, detection need to be further analyzed to acquired image, is got
The size and positional information of each several picture in image.The process of round dot relevant information, the meeting in subsequent step are demarcated in the acquisition
It is described in detail.
Step 204, the relevant parameter of micro- multiplying arrangement is calculated.
Information according to accessed by step 203, calculates relevant parameter, for example, the geometric graph on the calibrating template
As being demarcation round dot, and the actual diameter and spacing of the demarcation round dot are known, then by a certain demarcation round dot in image
Diameter of phi 1, compared with the actual diameter Φ 2 of the demarcation round dot, that is, the Φ 2 of Φ 1/, so as to calculate multiplication factor.With this phase
As, the parameters such as systematic error, aberration can be calculated according to other information.
In the prior art, its special calibrating template measured for fiber array is usually free of, so its measurement accuracy
It is often not ideal enough.But the invention provides a kind of demarcation of the technical scheme specifically designed for the measurement fiber array fibre core position
Template, can effectively improve measurement accuracy.
Step 102, by default measurement module, the tested optical fiber array end view drawing picture, the figure gathered first are gathered
As including at least two fibre cores, mobile work platform, then gather the tested optical fiber array end view drawing picture, the image bag gathered again
At least two fibre cores are included, and at least one fibre core is one of fibre core in last acquired image, is continued by equidirectional
Mobile work platform, the process of repeated acquisition image is finished until the whole tested optical fiber array end face is collected.
Measurement module in the step and the calibrating template in step 101 template that to be two kinds different：Measurement module be
Used when carrying out actual measurement to tested optical fiber array；Calibrating template is used when being demarcated.The purposes of the two
Although different, its making material and technique are then essentially identical, and the making material of template is usually relatively transparent, and thickness is small, intensity
Good, then the material is processed by the low material of coefficient of thermal expansion, such as optical glass by micro-nano photoetching process, is made
Required template, its structure is as shown in Figure 4.As seen from Figure 4, measurement module generally includes image coding information, and the image is compiled
Code information can be arranged to measurement module as shown in Figure 4, and a longer main line is set in the middle of the measurement module, and
Short-term is additionally provided with main line, described main line and short-term is exactly image coding information, certain image coding information is also not only
Only limit to and main line and short-term, can also be arranged to other can carry out the geometric figure of Image Coding.In explanation measurement module
Before the reason for upper setting main line and short-term, first the technological difficulties for measuring fiber array fibre core are illustrated.
Because the measurement of fiber array fibre core belongs to high-acruracy survey, its measurement is substantially in nanoscale, an optical fiber
Core diameter be generally up to about only tens microns, want accurately to carry out measurement of correlation to the fibre core of fiber array, just
High-precision measuring apparatus must be used.Carry out such measurement when, to fiber array measurement end face image be amplified be must
One of indispensable step, the visual field limited area of the equipment due to carrying out micro- amplification, then when carrying out high-acruracy survey,
The fibre core of tested optical fiber array is by exaggerated manyfold, so, often can only be comprising 1 to 2 fibre core in visual field, and one
Tested end face would generally include multiple fibre cores, if it is desired to know the position of each fibre core, then will get whole tested
The positional information of all fibre cores on end face.This is also the technological difficulties that must be solved in fiber array fibre core position measurement is carried out
One of.So, prior art is typically the positional information for once only obtaining a fibre core, then the information repeatedly got is carried out
Integrated treatment, finally obtains the result of needs.Therefore, in actual application, in order to get the position of all fibre cores
Confidence is ceased, it is necessary to can be moved to fiber array, and why fiber array is namely placed on movable working platform by this
Upper the reason for, because so fiber array can just be moved with moving for workbench.And general movable working platform is
Three-dimensional be able to can be carried out accurately controlling its displacement with mobile work platform.But in moving process, fiber array
Position may occur small skew, in order to find and correct the deviation that this is small, and some existing technical sides
Case is when measuring, due to the limitation of technology, it is impossible to overcomes these deviations well, and causes the accuracy of measurement inadequate
It is high.
Due in the present invention, being typically provided with a longer main line on the measurement module, the main line provides auxiliary
Calibration information.For example, refer to Fig. 5 A and Fig. 5 B, figure cathetus is served as theme, and circle is fibre core.When the preceding piece image collected
A and latter as b position relationship occur deviation when, its main line not point-blank, need to be just corrected, after correction,
Main line on image a and image b is just point-blank.Explanation is needed exist for, because the width of main line is wide, can be influenceed
The accuracy of measurement, but width is narrow, is unfavorable for later image processing, so the setting of bus width need to measure need according to actual
Select suitable width.By repetition test, it is clear that, the line width of main line is preferably between 1 μm~5 μm.
Some short-terms can also be set except main line, on the measurement module, and the short-term is used for fiber array end
Fibre core in the image of face is encoded, and the coding rule of short-term is usually that each fibre core carries out first encoding, thus short-term it
Between distance be exactly fiber array standard fibre core away from.By taking 32 multi-channel optical fiber arrays as an example, standard fibre core is away from for 127 μm, so mould
The distance between short-term is 127 μm on plate, then the template can be used for port number to be less than 32, and standard fibre core is away from the light for 127 μm
Fibre array fibre core away from measurement.Moreover, short-term can form an angle with main line as shown in Figure 2, can also it is vertical with main line (such as
Shown in Fig. 6).Due to when carrying out multiple IMAQ, it is possible to use image is marked the short-term, prevents to several figures
As when being spliced, occurring splicing mistake, so the set-up mode of short-term is not limited to mode shown in Fig. 4 and Fig. 6, only may be used
To play a part of marker recognition.
Need exist for illustrating, the number of fibers that the port number of fiber array described above, i.e. fiber array are included, and
Fibre core on fiber array end face is the end face of optical fiber.That is, the fiber array for having 1 passage includes 1 optical fiber, light
There is 1 fibre core on fibre array end face；The fiber array for having 32 passages just includes just to be had on 32 optical fiber, fiber array end face
32 fibre cores.
In addition, it makes material under normal circumstances and processing technology is essentially identical, chi for above-mentioned calibrating template and measurement module
Very little size is also basically identical.It therefore, it can the two being fabricated to one piece of template, that is to say, that in one piece of template, a part is mark
Solid plate, another part is measurement module, so more convenient to use, makes the process of replacing template and becomes simpler.
In order to accurate measurement, tested optical fiber array would generally be fixed on one be used for measure workbench, and
The workbench is moveable platform, is provided with fixture on workbench, for by fiber array and being covered in its and measuring end face
On template fix, prevent its shift and influence measurement.High-precision control device is typically provided inside workbench, for controlling work
The table top for making platform in the horizontal or vertical directions, carries out accurate movement as needed.Because fiber array and template are fixed on
On workbench, so when workbench is when moving playing surface, fiber array and template can also be moved.
Need exist for illustrating, because the end face of general fiber array has one 8 ° of inclined plane, such as Fig. 7 institutes
Show, if fiber array is placed on common horizontal fixture, then its tested end face there can be 8 ° of angle with vertical plane,
When carrying out IMAQ, the image got can the distortion because of the angle.In order to solve this problem, the present invention can be special
Fixture 1, the fixture 1 can set one 8 ° of inclination angle accordingly, when fiber array is positioned on the fixture 1, be tested end face
It is vertical with table plane, when thus overcoming IMAQ well the problem of distortion.Simultaneously for more preferable fixed quilt
Baffle plate 2 is further typically provided with light-metering fibre array, fixture 1, during for preventing that fiber array from inserting fixture, insertion is excessive；And
Card splenium part 3 is provided with, for fiber array to be fixed on into fixture 1, to prevent fiber array from being come off from fixture 1.Due to
Other parts of the fixture 1, it is similar with general fixture, therefore no longer elaborate herein.Need exist for explanation, figure
Fixture 1 shown in 7 is only merely an exemplary design method, in actual application, as long as fixture can make tested end
Face is vertical with table plane, and fixes on the table.
Under normal circumstances, camera can be used to shoot the end face of the tested optical fiber array covered by template.For the ease of
The processing in later stage, typically can also use image pick-up card to obtain digitized video image information, and stored and played back
Hardware device.The detailed process of collection measurement end face image is that camera can shoot the survey of tested optical fiber array by template
End face is measured, and image pick-up card can obtain image information by the image of shooting, then save image information, for
Output is carried out in the future to call.
In addition, according to description above, being clear that in an image acquisition process, it can not generally get
The image information of whole fibre cores, this is also one of technological difficulties of fiber array fibre core measurement.Prior art is usually, once only
The image information of a fibre core is obtained, multi collect is carried out, then the information repeatedly got is subjected to integrated treatment, is finally obtained
The result needed, but resulting result is not too accurate.And the image that the present invention is gathered every time generally includes two fibre cores, its
Gatherer process is usually to gather the image of the 1st fibre core and the 2nd fibre core for the first time, then moved by mobile work platform
Tested optical fiber array, until being moved into the position that suitable camera is shot, then carries out second of collection, obtains the 2nd again
The image of individual fibre core and the 3rd fibre core, after this collection is received, continues to move to workbench, then is acquired, so repeatedly, directly
Finished to the whole all fibre cores for measuring end face are collected, then whole image collection is completed.
For example, the fiber array of existing 4 passage, that is, measuring end face has 4 fibre cores, and template is covered in the end of fiber array
After on face, the position that moving fiber array is shot to suitable camera makes camera just to photograph the 1st and the 2nd
Fibre core, after shooting terminates, continues to move to fiber array, camera is photographed the 2nd and the 3rd fibre core, is shooting
After end, fiber array is continued to move to, camera is photographed the 3rd and the 4th fibre core, then whole measurement end face image
Collection is finished.In addition to above-mentioned style of shooting, other styles of shooting can also be used, for example, shoot the 1st and the 2nd for the first time
Fibre core, second of shooting the 3rd and the 4th fibre core.Certainly, can also be as needed using difference in actual mechanical process
Style of shooting.
Step 105, according to the measurement module, according to default algorithm, the multiple image of collection is spelled in order
Recovery is connect, and it is handled, the image after being handled, according to the image after the processing and the error, calculates fine
Core position.
From step 102, in order to obtain the image that whole fiber array measures end face, it will usually repeatedly schemed
As collection, so as to obtain multiple image., will for the ease of processing, it will usually which the multiple image of collection is spliced in order
It is restored to the image that view picture fiber array measures end face.It is noted herein that, due to the survey being covered on measurement end face
Image coding information is provided with amount template, therefore when carrying out image mosaic, can be judged according to the image coding information
Whether acquired image there is mistake.If for example, use style of shooting be, the 1st time shoot the 1st and the 2nd fibre core,
2nd shooting the 2nd and the 3rd fibre core, then as shown in Figure 8 A, the order of its image gathered is correct, but if such as Fig. 8 B
Shown, that explanation acquired image is put in order mistake, or fibre core has been clapped in leakage when shooting.So as to judge to be adopted
Whether the image of collection there is mistake.The reason for error can be that the time of IMAQ is very rapid, typically shoot first
After width image, workbench is moved at once, then shoots lower piece image, in the process, it is possible to because moving speed of table
It is not kept pace with gathering the speed of image and mistake occur；Or when carrying out graphical arrangement, two images order before and after occurring
Overturn, etc..And at the same time, on measurement module be additionally provided with image coding information, such as the main line in the middle of measurement module,
After the image being collected is arranged in order, you can the skew of fibre core in image is corrected according to main line, due to
Explain above, here is omitted.Image coding information as the similar main line and short-term set on measurement module, enters
One step improves the accuracy and reliability of technical scheme provided by the present invention.But in some existing technical schemes, carry
The measurement module of confession is typically continuous square box one by one, as shown in figure 9, the square box does not possess the measurement that the present invention is provided
The function of correction and the auxiliary splicing of template, so that measurement accuracy is influenceed, so the technical scheme that the present invention is provided is relatively existing
It is higher using the scheme measurement accuracy of measurement module in technology.
Due in actual applications, in order to become apparent from the image of collection, it is easy to recognize, it will usually set light
Source, the light that the light source is sent enters fiber optic conduction after collimation lens so that fiber core is one in acquired image
Individual high bright spots, are so more conducive to the later stage according to default algorithm to image mosaic recovery, are handled, and then cause according to figure
As the result that processing is calculated is more accurate, the measurement accuracy of technical solution of the present invention is improved.
Figure 10 is refer to, the process that the image of collection is handled may comprise steps of：
Step 301, the fiber array end face image of collection is read, and carries out smothing filtering pretreatment.
Here it is worth noting that because the image in actual application, collected may be due to IMAQ
The influence of equipment or external condition rather than very good, in order to preferably get required information from image,
Smothing filtering pretreatment would generally be carried out to picture.Certainly, this is it is not necessary to step, if the image ten collected is distinguished
It is clear, comply fully with pre-provisioning request, then the step can be omitted.
Step 302, the imaging region of positioning optical fiber, i.e. area-of-interest are extracted.
From foregoing teachings, because the visible ray that the light source of setting is sent is conducted into optical fiber so that optical fiber array
Fibre core on row measurement end face is presented highlighted, can thus extract the imaging region of fiber core.
Step 303, the edge extracting and positioning centre of sub-pixel are carried out to area-of-interest.
Here edge extracting can be carried out to area-of-interest using binomial interpolation algorithm scheduling algorithm, then utilizes minimum
Two multiply fitting process or the legal determination center of circle of Symmetric Quasi.
Step 304, the actual range of two core centres is calculated.
After image has been gathered, according to the amplification of the arrange parameter of image capture module and selected micro- amplification module
Multiplying power calculates the actual range of core centre.
For example, the image that image processing module is collected to image capture module is carried out after above-mentioned processing, obtain such as Figure 11
Shown image, then solid black lines circle is fibre core in figure, and black dotted lines frame is two area-of-interests extracted, black line
Seek to calculate fibre core away from.
Because smothing filtering mentioned above pre-processes, extracted imaging region, the binomial interpolation algorithm of positioning optical fiber
And least square fitting method belongs to prior art, then here is omitted.
Due in the prior art, without last splicing and recovery step, its simply single fibre core got relative to
The position relationship of standard volume.And the technical scheme that the present invention is provided, it can be got whole by the splicing and recovery to gathering image
The combination image of individual measurement end face, and then more accurately know the position relationship of each fibre core on measurement end face, further
Improve the measurement accuracy of the technical scheme.
Device embodiment：
Refer to Figure 12, the figure shows a kind of measurement fiber array fibre core for providing of the present invention away from system construction drawing.
The system includes Calibrating source, calibrating template (not shown in Figure 12), measurement module, workbench, image capture module and figure
As processing module.
Wherein, the calibrating template is a kind of template of speciality for function of calibrating systematic error, the structure of the calibrating template
Typically as shown in Fig. 2 would generally set multiple geometric figures in calibrating template, each figure is arranged according to design requirement, described several
The size and relative position of what figure are all known, and in a preferred embodiment, the geometric figure is generally circular, that is, marks
Determine round dot, the diameter of each demarcation round dot is identical, and the spacing between demarcation round dot is also identical, but in actual applications, can basis
Need, intended diameter or the different demarcation round dot of spacing, and calibration point is also not limited to circular or square grade other shapes
Shape.
In addition, the geometric figure on calibrating template, general size is smaller, this be due to fiber array fibre core measurement it is usual
Be it is nano level, equipment for gathering image multiplication factor it is general all than larger, if the size mistake of geometric figure
Greatly, in the image of collection, it is likely that the part of whole image only one of which geometric figure or only geometric figure, also with regard to nothing
Method obtains the information of geometric figure, and then can not calculate relevant parameter, diameter influence measurement accuracy.So, in calibrating template
Manufacturing process in, size and spacing etc. of geometric figure need to be designed according to actual conditions.
After calibrating template is made, demarcation can be followed the steps below, its idiographic flow is as shown in Figure 3.
Step 201, calibrating template is positioned over before image capture device；
Step 202, the image of calibrating template is gathered；
Step 203, the demarcation round dot in image is detected；
Step 204, the relevant parameter of image capture device is calculated.
In the prior art, its special calibrating template measured for fiber array is usually free of, so its measurement accuracy
It is often not ideal enough.But the invention provides a kind of demarcation of the technical scheme specifically designed for the measurement fiber array fibre core position
Template, can effectively improve measurement accuracy.
After demarcation has been carried out, you can enter in the actual measurement process of fiber array., need to be first by demarcation in actual measurement
Template is replaced as measurement module, could carry out subsequent step.
Measurement module mentioned here, for being placed in the position corresponding with tested optical fiber array end face, reality preferably
The mode of applying is covered on the measurement end face of tested optical fiber array, and the measurement module and calibrating template described before are two kinds
Different templates：Measurement module is used when actual measurement is carried out to tested optical fiber array；Calibrating template is then to enter
Rower timing is used.Although the purposes of the two is different, its making material and technique are then essentially identical, and the making material of template leads to
Often it is relatively transparent, thickness is small, and intensity is good, the low material of coefficient of thermal expansion, such as optical glass, quartz glass, engineering plastics.So
The material is processed by techniques such as micro-nano photoetching or semiconductor machining afterwards, required template is made, its structure is as schemed
Shown in 4.The measurement module includes image coding information, and as seen from Figure 4, the centre of measurement module would generally set one
Thicker main line, is additionally provided with short-term on main line, and main line and short-term here are exactly image coding information.Set on measurement module
Coding information as the similar main line and short-term put typically uses high-precision process equipment and is processed what is obtained, for example
High-precision interferometer etc., so ensures the precision of measurement module, so as to ensure that the measurement accuracy of whole measuring system.
In addition, it makes material under normal circumstances and processing technology is essentially identical for above-mentioned calibrating template and measurement module, it is long
Degree is also basically identical.It therefore, it can the two being fabricated to one piece of template, that is to say, that in one piece of template, a part is calibration mold
Plate, another part is measurement module, so more convenient to use, makes the process of replacing template and becomes simpler.
The measurement module made when in use, is fixed on moveable workbench.The workbench is except for solid
Determine measurement module, be additionally operable to fixed placement tested optical fiber array, and tested optical fiber array can be driven to move.
The workbench generally includes a three-dimensional mobile platform, and the movement of three dimensions can be achieved.In workbench
Portion is typically provided with control device, due to controlling the table top of workbench to carry out accurate movement in the horizontal or vertical directions, different
The workbench of model, its mobile accuracy is different, and influence can be also produced on the measurement accuracy of whole measuring system, therefore in selection work
When making platform, to be selected according to required measurement accuracy.Because workbench is that movement is controlled by control device, substantially
Do not need manual intervention, therefore accuracy of its movement is very high, translational speed also quickly so that the essence of whole measuring system
Degree and speed are all higher.
It should be noted that because the end face of general fiber array has one 8 ° of inclined plane, if as shown in fig. 7,
Fiber array is placed on common horizontal fixture, then its tested end face there can be 8 ° of angle with vertical plane, carry out
During IMAQ, the image got can the distortion because of the angle.In order to solve this problem, the present invention understands special fixture 1,
The fixture 1 can set one 8 ° of inclination angle accordingly, when fiber array is positioned on the fixture 1, be tested end face and work
Platform plane is vertical, when thus overcoming IMAQ well the problem of distortion.Simultaneously for more preferable fixed tested optical fiber
Baffle plate 2 is further typically provided with array, fixture 1, during for preventing that fiber array from inserting fixture 1, insertion is excessive；And be provided with
Card splenium part 3, for fiber array to be fixed on into fixture 1, to prevent fiber array from being come off from fixture 1.Due to the fixture
Other parts, it is similar with general fixture, therefore no longer elaborate herein.
After fiber array is fixed, it is possible to carry out image to the measurement end face of fiber array with image capture module and adopt
Collection.Described image acquisition module would generally include camera, the end face for shooting the tested optical fiber array covered by template.For
It is easy to the processing in later stage, image capture module typically also includes image pick-up card, and it is that one kind can obtain digitized video
Image information, and the hardware device for being stored and being played back.Under normal circumstances, image capture module collection measurement end view drawing
The detailed process of picture is that camera can shoot the measurement end face of tested optical fiber array by template, and image pick-up card can pass through
The image of shooting, obtains image information, then saves image information, called for carrying out output in the future.
In addition, it is generally the case that would generally indicate the parameters such as image magnification for image capture device, but in reality
In, during its manufacturing process and use, the mismachining tolerance of appearance or abrasion is used to be likely to so that image is adopted
It is not the numerical value that it is indicated to collect the parameters such as the actual multiplication factor of equipment.So in actual measurement process, it will usually profit
The error of image capture device and whole measuring system is demarcated with calibrating template.Taken the photograph in addition, CCD may be used herein
As head or CMOS camera, or it is the camera device that other can be used for carrying out IMAQ.
It should be noted that the measurement end face image that described image acquisition module is gathered is the figure by enhanced processing
Picture.Because the core diameter in general multimode fiber array is 62.5 μm, the core diameter of single-mode fiber array is 8~10 μm,
The basic None- identified of human eye, thus the present invention provide measurement fiber array in fibre core away from system also include micro- amplification mould
Block, for measurement by magnification end face, so that the measurement end face image being amplified.Wherein, micro- amplification module can be that optics shows
Micro mirror or its equipment that measurement end face can be amplified.Therefore, used preferred embodiment, IMAQ
Camera in module is shot through light microscope to the measurement end face of fiber array.Moreover, selecting micro- amplification
When equipment is as micro- amplification module, it should ensure that and meet image resolution requirement so that microscopic field of view includes at least adjacent two
Core.
Due in actual applications, in order to become apparent from the image of collection, it is easy to recognize, it will usually set light
Source, the light that the light source is sent enters fiber optic conduction after collimation lens so that fiber core is one in acquired image
Individual high bright spots, are so more conducive to the processing of later image, and then make it that the result calculated according to image procossing is more accurate,
Improve the measurement accuracy of technical solution of the present invention.Explanation is needed exist for, the light source can be white light source, can also
It is LED/light source or LASER Light Source, as long as the light source of enough light intensity can be improved, and light source intensity is basis
The conditions such as system multiplication factor, requirement to image resolution ratio are configured.As a rule, image resolution requirement is higher, is
Multiplication factor of uniting is bigger, and the intensity that its light source needs is also stronger.
After image capture module has gathered image, it is necessary to image processing module to acquired image at
Reason.From foregoing teachings, the image that whole fiber array measures end face can be obtained, it will usually carry out multiple image and adopt
Collection, so that multiple image is obtained, therefore the multiple image of collection can be carried out splicing recovery in order by image processing module, and it is right
Its is handled, according to the formwork calculation fibre core position.
Figure 10 is refer to, the process that the image of collection is handled may comprise steps of：
Step 301, the fiber array end face image of collection is read, and carries out smothing filtering pretreatment；
Step 302, the imaging region of positioning optical fiber, i.e. area-of-interest are extracted；
Step 303, the edge extracting of sub-pixel is carried out to the region using binomial interpolation algorithm and utilizes a most young waiter in a wineshop or an inn
Multiply fitting process positioning centre；
Step 304, according to the arrange parameter of image capture module and the enlargement ratio meter of selected micro- amplification module
Calculate the actual range of two core centres.
Because smothing filtering mentioned above pre-processes, extracted imaging region, the binomial interpolation algorithm of positioning optical fiber
And least square fitting method belongs to prior art, then here is omitted.
Due in the prior art, without last splicing and recovery step, its simply single fibre core got relative to
The position relationship of standard volume.And the technical scheme that the present invention is provided, it can be got whole by the splicing and recovery to gathering image
The combination image of individual measurement end face, and then more accurately know the position relationship of each fibre core on measurement end face, further
Improve the measurement accuracy of the technical scheme.
Meanwhile, locating platform of the measuring system that the present invention is provided without the complicated grand micro- dual drive submicron order of high accuracy
Or precise grating, it is only necessary to measurement result is extracted by image mosaic and pattern-recognition, you can realize fiber array high accuracy,
The accurate measurement of automation, more existing bulky measurement equipment has the advantages that facility compact, with low cost.
For the device embodiment of the present invention, because it is substantially similar to embodiment of the method, so the comparison of description
Simply, the relevent part can refer to the partial explaination of embodiments of method.
The method and system of the measurement fiber array fibre core position provided above the present invention are described in detail.This hair
The technical scheme of bright offer is demarcated using the calibrating template specially designed to measuring system, then measurement module is covered into whole
The measurement end face of fiber array, then moves tested optical fiber array using precision micro-worktable, while being continuously shot by aobvious
The core end surface image of micro- amplification, corrects adjacent two optical fiber using the measurement module specially designed and torsion is offset in moving process
The angle turned, and it is used as the auxiliary parameter for the Microscopic Image Mosaicing being continuously shot.Several micro-images of shooting are spliced
After recovery, then target identification and the information extraction of sub-pixel precision level are carried out to the micro-image after recovery, then according to micro-
The calculation of design parameters fibre core position of module.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements done etc. should be included within the scope of protection of the invention.
Claims (8)
1. a kind of fiber array fibre core is away from precision measurement method, it is characterised in that methods described includes：
Step A, is demarcated using default calibrating template, so as to obtain error；
Step B, by default measurement module, gathers tested optical fiber array end view drawing picture, the measurement module is tested with described
Fiber array end face correspondence is fixed on moveable workbench, has source light in the optical fiber of the fiber array in conduction,
The image gathered first is included after at least two fibre cores, mobile work platform, then gathers the tested optical fiber array end view drawing picture, then
The image of secondary collection includes at least two fibre cores, and at least one fibre core be fibre core in last acquired image it
One, continue to press equidirectional mobile work platform, the process of repeated acquisition image, until the whole tested optical fiber array end face is adopted
Collection is finished；Wherein, supplemental characteristic for providing image mosaic is provided with the measurement module and as measurement standard amount
Image coding information, described image coding information is to be arranged at a main line in the measurement module centre position and in institute
State according to some short-terms of the standard fibre core away from equidistantly distributed on main line, the measurement module is added by micro-nano photoetching process
Work is formed；
Step C, according to the measurement module, according to default algorithm, splicing recovery is carried out by the multiple image of collection in order,
And it is handled, the image after being handled, according to the image after the processing and the error, calculate fibre core position.
2. according to the method described in claim 1, it is characterised in that described image is the measurement end view drawing Jing Guo micro- amplification
Picture.
3. according to the method described in claim 1, it is characterised in that the step C also includes：Fiber array is placed in removable
On the special fixture of workbench.
4. according to the method described in claim 1, it is characterised in that the step B also includes：End face image is measured in collection
Before, by light source by fiber optic conduction, fibre core is presented highlighted.
5. a kind of fiber array fibre core is away from precision measurement system, it is characterised in that the system includes：
Calibrating template, the error for micro- amplification module in calibration system；
Measurement module, for being placed in the position corresponding with tested optical fiber array end face；Use is provided with the measurement module
In the supplemental characteristic and the image coding information as measurement standard amount that provide image mosaic, described image coding information is to set
Be placed in a main line in the measurement module centre position and on the main line according to standard fibre core away from equidistantly distributed
Some short-terms, the measurement module is processed by micro-nano photoetching process；
Workbench, for fixed placement tested optical fiber array, and can drive tested optical fiber array to move；
Image capture module, for by light source, collection to be superimposed the tested optical fiber array end view drawing picture of measurement module, first
The image of secondary collection includes at least two fibre cores, and after mobile work platform, the tested optical fiber array end view drawing picture is gathered again,
The image gathered again includes at least two fibre cores, and at least one fibre core be fibre core in last acquired image it
One, after mobile work platform at same direction is continued, the process of described image collection is repeated, until the whole tested optical fiber battle array
Row end face is collected to be finished；
Image processing module, for according to the measurement module, according to default algorithm, the multiple image of collection to be entered in order
Row splicing is restored, and it is handled, and calculates fibre core position.
6. system according to claim 5, it is characterised in that the micro- amplification module, for measurement by magnification end face, from
And the measurement end face image being amplified；The enlargement ratio of the micro- amplification module at least makes the image of collection include two
Fibre core.
7. system according to claim 5, it is characterised in that the system also includes fixture, for fiber array to be put
In on movable working platform.
8. system according to claim 5, it is characterised in that the system also includes light source, for by fiber optic conduction,
Fibre core is presented highlighted.
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| CN104359654B (en) * | 2014-11-07 | 2017-07-14 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of measuring method of optical fiber image transmission beam both ends of the surface pixel offset |
| TWI772353B (en) * | 2017-01-16 | 2022-08-01 | 日商索尼股份有限公司 | Optical detection method, optical detection device and program product |
| CN106969719A (en) * | 2017-03-28 | 2017-07-21 | 南京理工大学 | A kind of detection method and device of fiber array fibre core spacing |
| CN106840008B (en) * | 2017-04-07 | 2022-09-20 | 上海汇珏网络通信设备股份有限公司 | Optical fiber spacing measurement system and measurement method |
| CN109752835B (en) * | 2019-03-25 | 2021-03-19 | 南京泰立瑞信息科技有限公司 | X, Y axis positioning control method and system for microscope local visual field |
| CN111829443A (en) * | 2020-06-04 | 2020-10-27 | 广州奥鑫通讯设备有限公司 | Optical fiber spacing measuring system and measuring method thereof |
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