CN104019757A - Method of precisely measuring optical fiber array fiber core distance and system - Google Patents
Method of precisely measuring optical fiber array fiber core distance and system Download PDFInfo
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- CN104019757A CN104019757A CN201410230896.2A CN201410230896A CN104019757A CN 104019757 A CN104019757 A CN 104019757A CN 201410230896 A CN201410230896 A CN 201410230896A CN 104019757 A CN104019757 A CN 104019757A
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Abstract
The invention provides a method of precisely measuring an optical fiber array fiber core distance and a system. The method comprises steps: a preset calibration template is used for calibration and errors are obtained; end surface images of a to-be-measured optical fiber array are acquired according to a preset measurement template, the measurement template and the to-be-measured optical fiber array end surface are correspondingly fixed on a movable working table, and light source light in optical fibers in the optical fiber array is conducted; and according to the measurement template, a plurality of acquired images are spliced and restored in sequence according to the preset algorithm, processing is carried out, a processed image is obtained, and the fiber core position is calculated according to the processed image and the errors. The precision of optical fiber array fiber core distance measurement can be effectively improved without increasing the cost.
Description
Technical field
The present invention relates to field of measuring technique, relate in particular to a kind of fiber array fibre core spacing precision measurement method and system.
Background technology
Fiber array is between optical device and optical fiber, to be connected most widely used device in optical fiber telecommunications system, be mainly used in planar optical waveguide device, LD/PD array fibre device, array waveguide grating optical communication net, dense wave division multipurpose and hyperchannel micro-optic module, there is the features such as flexible biography looks like, usage space degree of freedom greatly, easily realizes slim-lined construction, lightweight.Optical fiber array is shown the fibre core spacing of 125 μ m, 127 μ m, 250 μ m three types, and port number has 1,2, and 4,8,16,32,64 etc., can reach at most 128 port numbers.Owing to manufacturing and rigging error, can cause optical fiber be placed on arrangement in V-type groove be not strict equidistantly.In each field, can realize fiber array and be connected with the accurate of optical element being applied to, the fibre core site error of fiber array is to cause the key factor of coupling loss.Therefore, be connected with the accurate of optical element in order to realize fiber array, reduce to greatest extent coupling loss, improve the alignment precision in coupling process, detect very necessary to the precision of fiber array fibre core position.
At present, roughly have following several for carrying out the method and system of fiber array fibre core position measurement.
A kind of metering system is manual measurement, that is to say, and manual observation microscope, moving clip is held the worktable of fiber array, and fibre core is alignd with Target Center, then reads the actual relative value between fibre core by the feedback data of worktable grating scale.But this measuring method efficiency is low, and measurement result is subject to man's activity more serious, in order to meet the needs of mass production, reduce costs and enhance productivity, need to develop noncontact, high-precision automated fiber optic array pitch measuring equipment.
The measuring accuracy of several measuring methods is higher in addition, one is relative measurement method, detailed process is, the standard fiber array being fixed in piezoelectric actuator does rotatablely moving of high speed, with the overlapping coupling of tested sample array fibre core, measure the coupling fiber parameter that rotatablely moves and produce, thereby obtain offset distance and the offset direction of fiber array fibre core.Another kind is, is transmitted to fiber array (FA) by white light source, and near field pattern (NFP) optical profilometer can observe FA center, and NFP optical profilometer will be searched the set center of each fiber optic hub coordinate by monitoring process.This several method measuring accuracy is high, consuming time short, but they have a common shortcoming, be exactly that measuring equipment is very expensive, for many R&D institutions, universities and colleges of mechanism and some enterprises, want to buy the measurement research that a set of measuring equipment is correlated with, be a very difficult thing.
Also have a kind of method to be, use an accurate fiber array template for referencial use, obtain the fibre core coordinate figure of fiber array and the apex coordinate of V-type groove through image identifying and processing, calculate and obtain the fibre core location map of fiber array and the summit distribution plan of V-type groove by computing machine.The method does not need submicron order high-precision linear delivery platform, comparatively speaking, this measuring system is more compact, price is also cheaper, but because the method is not demarcated its measuring system, and in measuring method, also multiple image is not spliced to the step of restoring, the also relevant setting of auxiliary splicing really in measurement module, therefore its measuring accuracy is on the low side.
In sum, existing measuring method and system, some measuring technique precision are on the low side, and the high measuring technique system complex of precision, and expensive.Therefore, be badly in need of now working out simplify, the method and system of economic, high-precision measuring optical fiber array fibre core position.
Summary of the invention
In view of this, the invention provides a kind of fiber array fibre core spacing precision measurement method, described method comprises:
Steps A, utilizes default calibrating template to demarcate, thereby obtains systematic error;
Step B, by default measurement module, gather described tested optical fiber array end view drawing picture, described measurement module is corresponding with described tested optical fiber array end face to be fixed on movably on worktable, in the optical fiber of described fiber array, there is source light in conduction, the image gathering first comprises at least two fibre cores, travelling table, gather again described tested optical fiber array end view drawing picture, the image again gathering comprises at least two fibre cores, and has a fibre core at least for one of fibre core in the last image gathering, continue by equidirectional travelling table, the process of repeated acquisition image, until whole described tested optical fiber array end face is collected complete,
Step C, according to described measurement module, according to default algorithm, splices in order recovery by the multiple image of collection, and it is processed, and obtains image after treatment, according to described image after treatment and described systematic error, calculates fibre core position.。
The present invention also provides a kind of fiber array fibre core spacing precision measurement system, and described system comprises:
Calibrating template, for the error of the micro-amplification module of calibration system;
Measurement module, for being placed in the position corresponding with tested optical fiber array end face;
Worktable, for fixed placement tested optical fiber array, and can drive tested optical fiber array to move;
Image capture module, be used for passing through light source, the superposeed described tested optical fiber array end view drawing picture of measurement module of collection, the image gathering first comprises at least two fibre cores, after travelling table, again gather described tested optical fiber array end view drawing picture, the image again gathering comprises at least two fibre cores, and has a fibre core at least for one of fibre core in the last image gathering, continuing by after same direction travelling table, repeat the process of described image acquisition, until whole described tested optical fiber array end face is collected complete;
Image processing module, for according to described measurement module, according to default algorithm, splices in order recovery by the multiple image of collection, and it is processed, and calculates fibre core position.
Technical scheme provided by the invention, can effectively reduce the measurement cost of fiber array fibre core spacing, can also ensure the measuring accuracy that it is higher simultaneously.
Brief description of the drawings
Fig. 1 is the process flow diagram of a kind of fiber array fibre core spacing precision measurement method provided by the invention.
Fig. 2 is the structural representation of a kind of calibrating template provided by the invention.
Fig. 3 is a kind of process flow diagram that utilizes calibrating template to demarcate image capture device provided by the invention.
Fig. 4 is a kind of measurement module structural representation provided by the invention.
Schematic diagram when Fig. 5 A is a kind of front and back provided by the invention two width picture positions generation deviation.
Schematic diagram when Fig. 5 B is a kind of front and back provided by the invention two width picture position bias free.
Fig. 6 is another kind of measurement module structural representation provided by the invention.
Fig. 7 is the schematic diagram of a kind of fiber array fibre core spacing precision measurement apparatus provided by the invention.
Fig. 8 A is the schematic diagram of a kind of two width picture position mistakes provided by the invention.
Fig. 8 B is a kind of two correct schematic diagram in width picture position provided by the invention.
Fig. 9 is the structural representation of a kind of measurement module of providing of prior art.
Figure 10 is the process flow diagram of a kind of image processing algorithm that calculates fibre core spacing provided by the invention.
Figure 11 is the micro-enlarged image of the treated fiber array end face of one provided by the invention.
Figure 12 is a kind of fiber array fibre core spacing precision measurement system schematic diagram provided by the invention.
embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Embodiment of the method:
Please refer to Fig. 1, the figure shows the present invention and carry out the flow process of the embodiment of the method for fiber array fibre core spacing measurement, the present embodiment can comprise the following steps.
Step 101, utilizes default calibrating template to demarcate, thereby obtains error.
Described demarcating module, is the tailored template for demarcating, and why will use calibrating template, obtains first and starts to talk about from demarcating.
Demarcate and generally refer to, the accuracy (precision) to used instrument detects, thereby determines the input-output relation of instrument or measuring system, gives instrument or measuring system scale division value; Determine the static characteristics index of instrument or measuring system; Eliminate systematic error, improve the degree of accuracy of instrument or system.Therefore,, in scientific measurement, demarcation is an important step can not be ignored.Because technical scheme provided by the invention need be utilized tested optical fiber array end face is amplified, gather again enlarged image, so before measuring, need first the device that carries out micro-amplification to be demarcated, and calibrating template is exactly a kind of device special for demarcation, as shown in Figure 2.
Please refer to Fig. 3, the process of utilizing calibrating template to demarcate, can comprise the following steps:
Step 201, is positioned over calibrating template before image capture device.
Under normal circumstances, calibrating template can be positioned over before image capture device, and the geometric figure on calibrating template can be clearly presented on the image being collected.
Step 202, the image of collection calibrating template.
In order to obtain the correlated error parameter of this measuring system, need to gather the image of calibrating template, difference by the geometric figure on the image to gathered and actual demarcation round dot is determined error parameter, the process of concrete definite error parameter, in subsequent step, can further describe.
Step 203, detects the geometric figure in image.
After having gathered the image of calibrating template, need carry out further analyzing and testing to gathered image, get size and the positional information of each several picture in image.This obtains the process of demarcating round dot relevant information, in subsequent step, can be elaborated.
Step 204, calculates the correlation parameter of micro-multiplying arrangement.
According to the accessed information of step 203, calculate correlation parameter, for example, several picture on described calibrating template is for demarcating round dot, and the actual diameter of this demarcation round dot and spacing are known, so by the diameter of phi 1 of a certain demarcation round dot in image, compared with the actual diameter Φ 2 of this demarcation round dot, namely Φ 1/ Φ 2, thus calculate enlargement factor.Similarly, can, according to other information, calculate the parameter such as systematic error, aberration.
In the prior art, conventionally all there is no its special calibrating template for fiber array measurement, so its measuring accuracy is often not ideal enough.But the calibrating template that the invention provides a kind of special technical scheme for this measuring optical fiber array fibre core position, can effectively improve measuring accuracy.
Step 102, by default measurement module, gather described tested optical fiber array end view drawing picture, the image gathering first comprises at least two fibre cores, travelling table, gather again described tested optical fiber array end view drawing picture, the image again gathering comprises at least two fibre cores, and has a fibre core at least for one of fibre core in the last image gathering, and continues by equidirectional travelling table, the process of repeated acquisition image, until whole described tested optical fiber array end face is collected complete.
Measurement module in this step and the calibrating template in step 101 are two kinds of different templates: measurement module is to use when tested optical fiber array is carried out to actual measurement; Calibrating template is to carry out timing signal use.Although the purposes of the two is different, but its making material and technique are basic identical, the making material of template is generally more transparent, thickness is little, and intensity is good, the material that coefficient of thermal expansion is low, for example optical glass, then this material is processed by micro-nano photoetching process, make required template, its structure as shown in Figure 4.As seen from Figure 4, measurement module generally includes image coding information, this image coding information can be arranged to measurement module as shown in Figure 4, a longer main line is set in the centre of this measurement module, and on main line, be also provided with short-term, said main line and short-term are exactly image coding information, and certainly also not only limitation and main line and short-term of image coding information also can be arranged to other and can carry out the geometric figure of Image Coding.Before the reason of main line and short-term being set on explanation measurement module, first to describe the technological difficulties of measuring optical fiber array fibre core.
Because the measurement of fiber array fibre core belongs to high-acruracy survey, its measurement is substantially all at nanoscale, the core diameter of an optical fiber only has at most tens microns conventionally, wants comparatively accurately the fibre core of fiber array to be carried out to measurement of correlation, just must use high-precision measuring equipment.In the time carrying out this type of measurement; fiber array is measured to end face image and amplify one of the step that is absolutely necessary; limited owing to carrying out the visual field area of equipment of micro-amplification; so in the time carrying out high-acruracy survey; the fibre core of tested optical fiber array will be exaggerated manyfold; so; in visual field, often can only comprise 1 to 2 fibre core; and a tested end face can comprise multiple fibre cores conventionally; if want to know the position of each fibre core, will get so the positional information of all fibre cores on whole tested end face.This is also carrying out in the position measurement of fiber array fibre core one of essential technological difficulties that solve.So prior art is normally once only obtained the positional information of a fibre core, then the information repeatedly getting is carried out to overall treatment, finally obtain the result needing.Therefore, in actual application, in order to get the positional information of all fibre cores, need to can move fiber array, why this namely will be placed on fiber array the reason on movable working platform, because fiber array just can move with the movement of worktable like this.And general movable working platform is that three-dimensional can travelling table, can carry out its displacement accurately to control.But in moving process, may there is small skew in the position of fiber array, in order to find and proofread and correct this small deviation, and more existing technical schemes are in the time measuring, due to the limitation of technology, cannot well overcome these deviations, and cause the accuracy of measurement not high enough.
Due in the present invention, on described measurement module, operated by rotary motion has a longer main line, and this main line provides assisted calibration information.For example, please refer to Fig. 5 A and Fig. 5 B, figure cathetus is served as theme, and circle is fibre core.In the time of the position relationship generation deviation of the front piece image a collecting and rear piece image b, its main line just not point-blank, need be proofreaied and correct, and after correction, the main line on image a and image b is with regard to point-blank.Here arranging of main line width it should be noted that, because the width of main line is wide, can affect the accuracy of measurement, but width be narrow, be unfavorable for later image processing, so need be selected suitable width according to practical measurement requirement.Through repetition test, can clearly know, the live width of main line is preferably between 1 μ m～5 μ m.
Except main line, on described measurement module, some short-terms can also be set, this short-term is for the fibre core of fiber array end face image is encoded, and the coding rule of short-term is generally that each root fibre core carries out first encoding, so the distance between short-term is exactly fiber array standard fibre core spacing.Taking 32 passage fiber arrays as example, standard fibre core spacing is 127 μ m, so the distance between short-term is 127 μ m in template, this template can be used for port number and is less than 32 so, and standard fibre core spacing is the measurement of the fiber array fibre core spacing of 127 μ m.And short-term can form an angle with main line as shown in Figure 2, can also vertical with main line (as shown in Figure 6).Due in the time carrying out repeatedly image acquisition, can utilize this short-term to carry out mark to image, prevent in the time that multiple image is spliced, splicing mistake occurs, so the set-up mode of short-term is not limited to mode shown in Fig. 4 and Fig. 6, only has the effect that can play mark identification.
Here it should be noted that, the port number of fiber array mentioned above, the number of fibers that fiber array comprises, and fibre core on fiber array end face is the end face of optical fiber.That is to say have the fiber array of 1 passage to include 1 optical fiber, on fiber array end face, have 1 fibre core; There is the fiber array of 32 passages just to include 32 optical fiber, on fiber array end face, just have 32 fibre cores.
In addition, above-mentioned calibrating template and measurement module under normal circumstances its make material and processing technology basic identical, size is also basically identical.Therefore, the two can be made into a template, that is to say, in a template, a part is calibrating template, and another part is measurement module, more convenient to use like this, makes the operation of changing template become simpler.
For can Measurement accuracy; tested optical fiber array can be fixed on a worktable for measuring conventionally; and this worktable is platform movably; on worktable, be provided with fixture; for by fiber array and cover its template of measuring on end face and fix, prevent its displacement and affect measurement.Worktable inside is generally provided with high-precision control device,, accurately moves as required in horizontal or vertical direction for the table top that controls worktable.Because fiber array and template have been fixed on worktable, so in the time of the moving playing surface of worktable, fiber array and template also can move thereupon.
What need here to describe is, because the end face of general fiber array has the dip plane of 8 °, as shown in Figure 7, if fiber array is placed on the fixture of common level, its tested end face can have with vertical plane the angle of 8 ° so, in the time carrying out image acquisition, the image getting can the distortion because of this angle.In order to address this problem, the present invention can special fixture 1, and this fixture 1 can arrange the pitch angle of 8 ° accordingly, in the time that fiber array is positioned on this fixture 1, tested end face is vertical with table plane, the problem of distortion while so just well having overcome image acquisition.Simultaneously, for better fixing tested optical fiber array, on fixture 1, be conventionally also provided with baffle plate 2, when preventing that fiber array from inserting fixture, insert excessively; And be provided with card pressure part 3, for fiber array being fixed on to fixture 1, to prevent that fiber array from coming off from fixture 1.Due to other parts of this fixture 1, similar with general fixture, so locate no longer to elaborate.Here it should be noted that, fixture 1 shown in Fig. 7 is only an exemplary design, in actual application, as long as fixture can make tested end face vertical with table plane, and is fixed on worktable.
Under normal circumstances, can use camera to take the end face of the tested optical fiber array being covered by template.For the ease of the processing in later stage, generally also can use image pick-up card to obtain digitized video image information, and by its storage and the hardware device that plays back.Gathering the detailed process of measuring end face image is, camera can be taken by template the measurement end face of tested optical fiber array, and image pick-up card can, by the image of taking, obtain image information, then image information is saved, for export and call in the future.
In addition, according to description above, can clearly know in an image acquisition process, conventionally cannot get the image information of whole fibre cores, this is also one of technological difficulties of fiber array fibre core measurement.Prior art generally, is once only obtained the image information of a fibre core, carries out multi collect, then the information repeatedly getting is carried out to overall treatment, finally obtain the result of needs, but the result obtaining is not too accurate.And the each image gathering of the present invention generally includes two fibre cores, its gatherer process is generally, gather for the first time the image of the 1st fibre core and the 2nd fibre core, then move tested optical fiber array by travelling table, be applicable to until move to the position that camera is taken, and then gather for the second time, obtain the image of the 2nd fibre core and the 3rd fibre core, after this gathers and receives, continue travelling table, then gather, so repeatedly, until all fibre cores of whole measurement end face are collected complete, whole image acquisition completes.
For example, the fiber array of existing 4 passages, measure end face and have 4 fibre cores, after template being covered on the end face of fiber array, moving fiber array is to the position that is applicable to camera shooting, make camera just in time can photograph the 1st and the 2nd fibre core, after shooting finishes, continue moving fiber array, make camera can photograph the 2nd and the 3rd fibre core, after shooting finishes, continue moving fiber array, make camera can photograph the 3rd and the 4th fibre core, whole measurement end face image acquisition is complete.Except above-mentioned style of shooting, can also adopt other styles of shooting, for example take for the first time the 1st and the 2nd fibre core, take for the second time the 3rd and the 4th fibre core.Certainly,, in actual mechanical process, also can adopt as required different styles of shooting.
Step 105, according to described measurement module, according to default algorithm, splices in order recovery by the multiple image of collection, and it is processed, and obtains image after treatment, according to described image after treatment and described error, calculates fibre core position.
From step 102, measure the image of end face in order to obtain whole fiber array, conventionally can carry out repeatedly image acquisition, thereby obtain multiple image.For the ease of processing, conventionally the multiple image of collection can be spliced in order, be restored to the image of view picture fiber array measurement end face.Here it should be noted that owing to covering on the measurement module of measuring on end face and be provided with image coding information, therefore, in the time carrying out Image Mosaics, can judge gathered image according to this image coding information and whether occur mistake.For example, if the style of shooting adopting is, take the 1st and the 2nd fibre core the 1st time, take the 2nd and the 3rd fibre core the 2nd time, so as shown in Figure 8 A, the order of the image of its collection is correct, if but as shown in Figure 8 B, that image of gathering of explanation mistake that puts in order, or take hourglass and clapped fibre core.Thereby can judge gathered image and whether occur mistake.The reason of makeing mistakes can be that the time of image acquisition is very rapid, normally taken after piece image, worktable moves at once, then takes lower piece image, in this process, likely because not catching up with the speed of collection image, moving speed of table there is mistake; Or in the time carrying out image arrangement, before and after occurring, two width image sequences are put upside down, etc.And meanwhile, on measurement module, be also provided with image coding information, for example main line in the middle of measurement module, after be collected image is arranged in order, can proofread and correct the skew of fibre core in image according to main line, owing to explaining above, repeat no more herein.The similar main line arranging on measurement module and the such image coding information of short-term, further improved accuracy and the reliability of technical scheme provided by the present invention.But in some existing technical schemes, normally continuous square box one by one of the measurement module providing, as shown in Figure 9, this square box does not possess the function of correction and the auxiliary splicing of measurement module provided by the invention, thereby affect measuring accuracy, so in the relative prior art of technical scheme provided by the invention, use the scheme measuring accuracy of measurement module higher.
Due in actual applications; in order to make the image of collection more clear; be easy to identification; light source can be set conventionally, the light that this light source is sent through collimation lens laggard enter fiber optic conduction, making fiber core on gathered image is a highlighted luminous point; being more conducive to like this later stage restores Image Mosaics according to default algorithm; process, and then make the result that processing calculates according to image more accurate, improved the measuring accuracy of technical solution of the present invention.
Please refer to Figure 10, the process that the image gathering is processed can comprise the following steps:
Step 301, reads the fiber array end face image of collection, and carries out smothing filtering pre-service.
Here it should be noted that; due in actual application; the image collecting may, due to the impact of image capture device or external condition instead of very good, in order better to get required information from image, can carry out smothing filtering pre-service to picture conventionally.Certainly, this is not necessary step, if the image collecting is very clear, meets pre-provisioning request completely, and this step can be omitted so.
Step 302, the imaging region of extraction positioning optical waveguides, i.e. area-of-interest.
From aforementioned content, because entering optical fiber, the visible ray that sends of light source arranging conducts, and make fiber array measure fibre core on end face and present highlightedly, so just can extract the imaging region of fiber core.
Step 303, carries out edge extracting the positioning centre of sub-pixel to area-of-interest.
Here can adopt binomial interpolation algorithm scheduling algorithm to carry out edge extracting to area-of-interest, then utilize the legal definite center of circle of least square fitting method or Symmetric Quasi.
Step 304, calculates the actual range of two core centres.
Gathering after image, calculating the actual range of core centre according to the enlargement ratio of the parameters of image capture module and selected micro-amplification module.
For example, the image that image processing module collects image capture module carries out, after above-mentioned processing, obtaining image as shown in figure 11, and in figure, solid black lines circle is fibre core so, black dotted lines frame is two area-of-interests that extract, and black line is exactly the fibre core spacing that will calculate.
Because imaging region, binomial interpolation algorithm and the least square fitting method of smothing filtering pre-service mentioned above, extraction positioning optical waveguides belong to prior art, repeat no more herein.
Due in the prior art, there is no last splicing and recovery step, what it got is the position relationship of single fibre core with respect to standard volume.And technical scheme provided by the invention, can be by the splicing and recovery to collection image, get the combination image of whole measurement end face, and then know more accurately the position relationship of measuring each fibre core on end face, further improved the measuring accuracy of this technical scheme.
Device embodiment:
Please refer to Figure 12, the figure shows the system construction drawing of a kind of measuring optical fiber array fibre core spacing provided by the invention.This system comprises Calibrating source, calibrating template (not shown in Figure 12), measurement module, worktable, image capture module and image processing module.
Wherein, described calibrating template is the template for a kind of speciality of function of calibrating systematic error, the structure of this calibrating template generally as shown in Figure 2, multiple geometric figures can be set in calibrating template conventionally, each figure is arranged according to designing requirement, described geometric size and relative position are all known, in a preferred embodiment, it is circular that this geometric figure is generally, demarcate round dot, the diameter of each demarcation round dot is identical, spacing between demarcation round dot is also identical, but in actual applications, can be as required, the demarcation round dot that intended diameter or spacing are different, and calibration point is also not limited to circle, also square other shapes such as grade.
In addition, geometric figure on calibrating template, general size is less, and this is because the measurement of fiber array fibre core is normally nano level, generally all larger for gathering the enlargement factor of equipment of image, if geometric oversize, in the time of the image gathering, probably whole image only has a geometric figure or only has geometric part, also just cannot obtain geometric information, and then cannot calculate correlation parameter, diameter affects measuring accuracy.So, in the manufacturing process of calibrating template, need design geometric size and spacing etc. according to actual conditions.
Making after calibrating template, can demarcate according to following steps, its idiographic flow as shown in Figure 3.
Step 201, is positioned over calibrating template before image capture device;
Step 202, the image of collection calibrating template;
Step 203, detects the demarcation round dot in image;
Step 204, calculates the correlation parameter of image capture device.
In the prior art, conventionally all there is no its special calibrating template for fiber array measurement, so its measuring accuracy is often not ideal enough.But the calibrating template that the invention provides a kind of special technical scheme for this measuring optical fiber array fibre core position, can effectively improve measuring accuracy.
Carrying out after demarcation, can enter in the actual measurement process of fiber array.In the time of actual measurement, need first calibrating template to be replaced into measurement module, just can carry out subsequent step.
Here said measurement module, for being placed in the position corresponding with tested optical fiber array end face, be preferred embodiment to cover on the measurement end face of tested optical fiber array, this measurement module and described calibrating template are before two kinds of different templates: measurement module is to use when tested optical fiber array is carried out to actual measurement; Calibrating template is to carry out timing signal use.Although the purposes of the two is different, its making material and technique are basic identical, and the making material of template is generally more transparent, and thickness is little, and intensity is good, the material that coefficient of thermal expansion is low, such as optical glass, quartz glass, engineering plastics etc.Then this material is processed by techniques such as micro-nano photoetching or semiconductor machining, make required template, its structure as shown in Figure 4.Described measurement module comprises image coding information, and as seen from Figure 4, the centre of measurement module can arrange a thicker main line conventionally, is also provided with short-term on main line, and the main line here and short-term are exactly image coding information.The similar main line arranging on measurement module and the such coded message of short-term typically use high-precision process equipment and process and obtain, such as high precision interferometer etc., so just guarantee the precision of measurement module, thereby ensured the measuring accuracy of whole measuring system.
In addition, above-mentioned calibrating template and measurement module under normal circumstances its make material and processing technology basic identical, length is also basically identical.Therefore, the two can be made into a template, that is to say, in a template, a part is calibrating template, and another part is measurement module, more convenient to use like this, makes the operation of changing template become simpler.
The measurement module of making in use, is fixed on movably on worktable.This worktable, except for fixation measuring template, also for fixed placement tested optical fiber array, and can drive tested optical fiber array to move.
Described worktable generally includes a three-dimensional mobile platform, can realize the movement of three dimensions.In the inside of worktable, operated by rotary motion has control device, because the table top that controls worktable accurately moves in horizontal or vertical direction, the worktable of different model, its mobile accuracy difference, also can exert an influence to the measuring accuracy of whole measuring system, therefore in the time selecting worktable, select according to required measuring accuracy.Controlled mobilely by control device due to worktable, substantially do not need manual intervention, therefore its accuracy moving is very high, and translational speed is also very fast, thus make the precision of whole measuring system and speed all higher.
It should be noted that, because the end face of general fiber array has the dip plane of 8 °, as shown in Figure 7, if fiber array is placed on the fixture of common level, its tested end face can have with vertical plane the angle of 8 ° so, in the time carrying out image acquisition, the image getting can the distortion because of this angle.In order to address this problem, the present invention can special fixture 1, and this fixture 1 can arrange the pitch angle of 8 ° accordingly, in the time that fiber array is positioned on this fixture 1, tested end face is vertical with table plane, the problem of distortion while so just well having overcome image acquisition.Simultaneously, for better fixing tested optical fiber array, on fixture 1, be conventionally also provided with baffle plate 2, when preventing that fiber array from inserting fixture 1, insert excessively; And be provided with card pressure part 3, for fiber array being fixed on to fixture 1, to prevent that fiber array from coming off from fixture 1.Due to other parts of this fixture, similar with general fixture, so locate no longer to elaborate.
Fixing after fiber array, just can carry out image acquisition to the measurement end face of fiber array with image capture module.Described image capture module can comprise camera conventionally, for taking the end face of the tested optical fiber array being covered by template.For the ease of the processing in later stage, image capture module generally also comprises image pick-up card, and it is that one can be obtained digitized video image information, and by its storage and the hardware device that plays back.Under normal circumstances, the detailed process that end face image is measured in image capture module collection is, camera can be taken by template the measurement end face of tested optical fiber array, and image pick-up card can be by the image of taking, obtain image information, then image information is saved, for export and call in the future.
In addition; under normal circumstances; conventionally can indicate the parameters such as image enlargement factor for image capture device; but in actual applications; in its manufacture process and use procedure, it is not its numerical value indicating that the mismachining tolerance of appearance or use wearing and tearing all likely make the parameters such as the actual enlargement factor of image capture device.So in actual measurement process, conventionally can utilize calibrating template to demarcate the error of image capture device and whole measuring system.In addition, can use CCD camera here, can be also CMOS camera, or be other camera heads that can be used for carrying out image acquisition.
It should be noted that, the measurement end face image that described image capture module gathers is the image of processing through amplifying.Because the core diameter in general multimode fiber array is 62.5 μ m, the core diameter of single-mode fiber array is 8～10 μ m, the basic None-identified of human eye, therefore in measuring optical fiber array provided by the invention, the system of fibre core spacing also comprises micro-amplification module, for measurement by magnification end face, thus the measurement end face image being amplified.Wherein, micro-amplification module can be optical microscope, can be also its equipment that can amplify measuring end face.Therefore,, in use preferred embodiment, the camera in image capture module sees through optical microscope the measurement end face of fiber array is taken.And, in the time selecting micro-multiplying arrangement as micro-amplification module, should ensure to meet image resolution ratio requirement, make microscopic field of view comprise at least adjacent two cores.
Due in actual applications; in order to make the image of collection more clear; be easy to identification; light source can be set conventionally; light that this light source is sent through collimation lens laggard enter fiber optic conduction, making fiber core on gathered image is a highlighted luminous point, is more conducive to like this processing of later image; and then make the result that processing calculates according to image more accurate, improve the measuring accuracy of technical solution of the present invention.Here it should be noted that, described light source can be white light source, can be also LED light source, can be also LASER Light Source, as long as the light source that can improve enough light intensity all can, and light source intensity is to arrange according to conditions such as system enlargement factor, requirements to image resolution ratio.As a rule, image resolution ratio requires higher, and system enlargement factor is larger, and the intensity that its light source needs is also stronger.
After image capture module has gathered image, just need to process gathered image with image processing module.From aforementioned content; can obtain whole fiber array and measure the image of end face; conventionally can carry out repeatedly image acquisition; thereby obtain multiple image; therefore image processing module can splice recovery in order by the multiple image of collection; and it is processed, according to described formwork calculation fibre core position.
Please refer to Figure 10, the process that the image gathering is processed can comprise the following steps:
Step 301, reads the fiber array end face image of collection, and carries out smothing filtering pre-service;
Step 302, the imaging region of extraction positioning optical waveguides, i.e. area-of-interest;
Step 303, adopts binomial interpolation algorithm to carry out the edge extracting of sub-pixel and utilize least square fitting method positioning centre this region;
Step 304, calculates the actual range of two core centres according to the enlargement ratio of the parameters of image capture module and selected micro-amplification module.
Because imaging region, binomial interpolation algorithm and the least square fitting method of smothing filtering pre-service mentioned above, extraction positioning optical waveguides belong to prior art, repeat no more herein.
Due in the prior art, there is no last splicing and recovery step, what it got is the position relationship of single fibre core with respect to standard volume.And technical scheme provided by the invention, can be by the splicing and recovery to collection image, get the combination image of whole measurement end face, and then know more accurately the position relationship of measuring each fibre core on end face, further improved the measuring accuracy of this technical scheme.
Simultaneously, measuring system provided by the invention is without locating platform or the precise grating of the grand micro-Dual Drive submicron order of complicated high precision, only need to extract measurement result by Image Mosaics and pattern-recognition, can realize the precision measurement of fiber array high precision, robotization, more existing large-scale measuring equipment, has advantages of facility compact, with low cost.
For device embodiment of the present invention, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part is referring to the part explanation of embodiment of the method.
Above the method and system of measuring optical fiber array fibre core provided by the invention position are had been described in detail.Technical scheme provided by the invention utilizes custom-designed calibrating template to demarcate measuring system, again measurement module is covered to the measurement end face of whole fiber array, then adopt precision micro-worktable to move tested optical fiber array, take continuously the fibre core end view drawing picture through micro-amplification simultaneously, utilize custom-designed measurement module to proofread and correct adjacent two optical fiber and in moving process, be offset the angle of reversing, and the conduct auxiliary parameter of the Microscopic Image Mosaicing of shooting continuously.Several micro-images of taking are spliced after recovery, then the micro-image after restoring is carried out to target identification and the information extraction of sub-pixel precision level, then according to the calculation of design parameters fibre core position of micro-module.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (10)
1. a fiber array fibre core spacing precision measurement method, is characterized in that, described method comprises:
Steps A, utilizes default calibrating template to demarcate, thereby obtains error;
Step B, by default measurement module, gather described tested optical fiber array end view drawing picture, described measurement module is corresponding with described tested optical fiber array end face to be fixed on movably on worktable, in the optical fiber of described fiber array, there is source light in conduction, the image gathering first comprises at least two fibre cores, after travelling table, gather again described tested optical fiber array end view drawing picture, the image again gathering comprises at least two fibre cores, and has a fibre core at least for one of fibre core in the last image gathering, continue by equidirectional travelling table, the process of repeated acquisition image, until whole described tested optical fiber array end face is collected complete,
Step C, according to described measurement module, according to default algorithm, splices in order recovery by the multiple image of collection, and it is processed, and obtains image after treatment, according to described image after treatment and described error, calculates fibre core position.
2. method according to claim 1, is characterized in that, described measurement module comprises image coding information, for the supplemental characteristic of Image Mosaics is provided, and as measurement standard amount; Described calibrating template comprises some sizes and the known geometric figure of relative position.
3. method according to claim 1, is characterized in that, described image is the measurement end face image through micro-amplification.
4. method according to claim 1, is characterized in that, described step C also comprises: fiber array is placed on the special fixture of movable working platform.
5. method according to claim 1, is characterized in that, described step D also comprises: gathering before measurement end face image, by fiber optic conduction, fibre core is presented highlighted light source.
6. a fiber array fibre core spacing precision measurement system, is characterized in that, described system comprises:
Calibrating template, for the error of the micro-amplification module of calibration system;
Measurement module, for being placed in the position corresponding with tested optical fiber array end face;
Worktable, for fixed placement tested optical fiber array, and can drive tested optical fiber array to move;
Image capture module, be used for passing through light source, the superposeed described tested optical fiber array end view drawing picture of measurement module of collection, the image gathering first comprises at least two fibre cores, after travelling table, again gather described tested optical fiber array end view drawing picture, the image again gathering comprises at least two fibre cores, and has a fibre core at least for one of fibre core in the last image gathering, continuing by after same direction travelling table, repeat the process of described image acquisition, until whole described tested optical fiber array end face is collected complete;
Image processing module, for according to described measurement module, according to default algorithm, splices in order recovery by the multiple image of collection, and it is processed, and calculates fibre core position.
7. system according to claim 6, is characterized in that, described measurement module comprises image coding information, for the supplemental characteristic of Image Mosaics is provided, and as measurement standard amount; Described calibrating template comprises some sizes and the known geometric figure of relative position.
8. system according to claim 6, is characterized in that, described micro-amplification module, and for measurement by magnification end face, thus the measurement end face image being amplified; The enlargement ratio of described micro-amplification module at least makes the image gathering comprise two fibre cores.
9. system according to claim 6, is characterized in that, described system also comprises fixture, for fiber array is placed in to movable working platform.
10. system according to claim 6, is characterized in that, described system also comprises light source, for by fiber optic conduction, fibre core is presented highlighted.
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