CN104614803A - ARM-based integrated polarization maintaining fiber axis positioning instrument - Google Patents
ARM-based integrated polarization maintaining fiber axis positioning instrument Download PDFInfo
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- CN104614803A CN104614803A CN201510041446.3A CN201510041446A CN104614803A CN 104614803 A CN104614803 A CN 104614803A CN 201510041446 A CN201510041446 A CN 201510041446A CN 104614803 A CN104614803 A CN 104614803A
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Abstract
The invention discloses an ARM-based integrated polarization maintaining fiber axis positioning instrument. The instrument comprises an image acquisition unit, an image processing and control unit, movement of the actuator and interactive unit; image acquisition unit includes a light source, a microscope objective lens barrel, a complementary metal oxide semiconductor (CMOS) industrial cameras and micro-camera; movement of the actuator comprises a fiber rotator, manual displacement units, the displacement of the electric station, fiber pad, a first motion control board and a second motion control board; interactive unit including a touch screen; an image processing and control unit comprises a microprocessor, memory module, a communication interface, a display module, debug and power modules; ARM as the processor uses the touch screen as the user interface, small size, low cost, interactive and friendly, the advantages of fast speed.
Description
Technical field
The invention belongs to fiber optic sensor technology field, relate to a kind of integrated polarization-preserving fiber axis fixing instrument based on ARM.
Background technology
Polarization maintaining optical fibre due to the polarization state of the light beam propagated along polarization axis direction can be kept constant, and is widely used in the every field of Fibre Optical Sensor.When polarization maintaining optical fibre and other protect inclined device be connected exist axis error time, polarization coupled can occur, its polarization retention can be deteriorated, therefore to the detection and positioning of polarization maintaining optical fibre polarization axle be polarization maintaining optical fibre application in gordian technique.The polarization axle detection technique of polarization maintaining optical fibre mainly contains vertical relations at present and laterally observes two kinds of methods, side-looking imaging dead axle method both at home and abroad in the main horizontal detection method adopted, side-looking imaging dead axle method is with its degree of precision (1 ° ~ 1.5 °), simple and easy to do, be widely used in various types of optical fiber, but error is still comparatively large, and automaticity is not high yet.
Digital Image Processing refers to by digital machine processing digital images, is convenient to people's explanation or machine perception to improve pictorial information.One width digital picture is image f (x, y) of all discretizes in volume coordinate and brightness, and it can represent by one 2 dimension integer array.Digital image processing techniques have abundant content, and it can by increasing the contrast of image to strengthen the quality of image, and this is called image enhaucament; Can express image with the least possible bit, this is called compression of images; Can improve image in objective mode, this is called Postprocessing technique; Some characteristic can extracting image carrys out the content of recognisable image, and this is called feature extraction.Digital Image Processing has that processing accuracy is high, repeatability good, cost is low and the feature such as widely applicable, is widely used in various technical field.
In image processing system, first by camera, the object in objective three-dimensional world to be changed into two-dimensional discrete image.The accuracy of this imaging process, namely whether target imaging truly reflects that actual measurand is most important, and the sharpness of image directly has influence on the processing accuracy of whole system.The factor affecting imaging definition mainly contains camera lens, CCD and illumination etc., wherein image whether correctly focusing be key factor wherein.From optical imagery model, when object distance, image distance and focal length meet imaging relations formula, the radius of the circle of confusion picture that pointolite becomes is minimum, and now image is the most clear, and the details comprised is maximum.Therefore focusing can be realized by changing object distance, image distance or focal length.In image capturing system in early days, this process is mainly accomplished manually, and whether image focuses by people's subjective determination.Along with the requirement of image processing system to focusing precision, speed and automaticity improves constantly, auto-focusing instead of manual focus gradually, but still there is ample room for improvement for focusing precision, stability and speed.
Embedded system is application-centered, and based on computer technology, software and hardware can cutting, adapts to dedicated computer system function, reliability, cost, volume, power consumption being had to strict demand of application system.A complete embedded system is primarily of hardware systems, software program two large divisions composition.The core embedding hardware systems is microprocessor, also has the ingredients such as storer, each class interface, telemetry circuit.Software program comprises operating system and application program two large divisions.Operating system conventional in embedded system has VxWorks, WinCE and Linux etc., and wherein linux system endorses cutting, open source in relying on, transplantability is good, driving is abundant, security of system is high and the advantage such as powerful technical support is widely used in embedded system development.Application program realizes concrete goal systems function, is usually structured on a certain real time operating system.Except the function measured except wanting real-time implementation and control, application program also will have good human-computer interaction interface.Qt is a cross-platform C++ graphical user interface application program frame, its complete object-oriented, and being easy to expansion, and allowing real component programming, is conventional Linux embedded system GUI developing instrument.
ARM microprocessor by Britain ARM company designs and intellecture property is provided, be the general-purpose chip produced based on ARM framework of many famous semiconductors, software and original equipment manufacturer in the world.Current ARM, in the share of handheld device market share more than 90%, effectively can shorten the time of application development and test, also reduce R & D Cost.ARM microprocessor generally all has that volume is little, low in energy consumption, cost is low, performance is high, fireballing feature, it supports ARM (32)/Thumb (16) two instruction set, the performance of its internal hardware resource is higher, real time operating system can be loaded, can runnable interface and application program, there is process at a high speed and computing power, general digital image acquisition and processing demands can be competent at completely, be applicable to very much being applied to image processing system.
Summary of the invention
The object of the invention is to solve the problem, proposing a kind of integrated polarization-preserving fiber axis fixing instrument based on ARM, can realize fast and accurately auto-focusing to obtain fiber end face image clearly; The orientation of polarization maintaining optical fibre polarization axle can be detected real-time high-precision, according to the polarization angle detected, by optical fibre rotator, polarization maintaining optical fibre can be rotated to assigned address fast, accurately, stably.
Based on the integrated polarization-preserving fiber axis fixing instrument of ARM, comprise image acquisition units, image procossing and control module, movement executing mechanism and man-machine interaction unit;
Image acquisition units comprises light source, microcobjective, lens barrel, CMOS industrial camera and microimaging head; Light source divests the polarization maintaining optical fibre of coat with 30 ° of oblique front irradiations in-60 ° of angles, and coaxially, CMOS camera is connected with microcobjective by lens barrel, and microimaging head is fixed on above polarization maintaining optical fibre for microcobjective and polarization maintaining optical fibre;
Movement executing mechanism comprises optical fibre rotator, manual displacement platform, electricity driving displacement platform, optical fiber pad, the first motion control board and the second motion control board; Polarization maintaining optical fibre is fixed on optical fibre rotator, optical fibre rotator is fixed on manual displacement platform, displacement platform and optical fiber pad is manually regulated to change the locus of polarization maintaining optical fibre, optical fibre rotator rotation polarization maintaining optical fibre is made to change its polarization angle by sending instruction to the first motion control board, lens barrel is fixed on electricity driving displacement platform, by send to the second motion control board instruction control bit moving stage along barrelshift to move radially, thus the association of mobile lens barrel, object lens and camera;
Man-machine interaction unit comprises touch-screen, polarization maintaining optical fibre is fixed on optical fibre rotator, microimaging head gathers polarization maintaining optical fibre side image and exports image procossing and control module to, observe optical fiber side image on touch-screen, manually polarization maintaining optical fibre is adjusted to microcobjective coaxial, end view drawing picture through microcobjective amplify after by CMOS camera Real-time Collection, the image collected is transferred to image procossing and control module by USB data line by CMOS camera, the sharpness of image procossing and control module difference computed image and polarization angle, to the first motion control board, second motion control board sends instruction, motion control board drives optical fibre rotator, the electric machine rotation of motor and displacement platform realizes auto-focusing and automatic shaft fixing,
Image procossing and control module comprise microprocessor, memory module, communication interface, display module, debugging module and power module;
Microprocessor adopts arm processor, the sharpness of computed image and polarization angle, and send instruction to the first motion control board, the second motion control board, memory module stores data; Communication interface comprises RS232 serial ports and USB interface, RS232 serial ports is connected with the first motion control board, the second motion control board respectively, for sending movement instruction, USB interface is connected with microimaging head and CMOS camera respectively, and display module is connected with capacitance touch screen by LCD interface; Debugging module adopts jtag interface; Power module adopts DC power supply.
The invention has the advantages that:
(1) adopt ARM as processor, touch-screen, as human-computer interaction interface, has volume little, and cost is low, and man-machine interaction is friendly, the advantage of fast operation;
(2) utilize Laplace operator as sharpness evaluation function, multi-pace moves object lens, achieves fiber end face and optical fiber pad auto-focusing fast and accurately;
(3) utilize the method for Digital Image Processing to detect polarization maintaining optical fibre polarization axle orientation, the positioning precision of sub-pix can be obtained;
(4) adopt closed-loop control, quick, stable, high-precision automatic shaft fixing can be realized.
Accompanying drawing explanation
Fig. 1 is the structural representation of the integrated polarization-preserving fiber axis fixing instrument based on ARM of the present invention;
The processor die block structural diagram that Fig. 2 is is core with ARM chip;
Fig. 3 is sharpness evaluation function curve in auto-focus process;
Fig. 4 is integrated polarization-preserving fiber axis fixing instrument auto-focusing process flow diagram of the present invention;
Fig. 5 is the polarization maintaining optical fibre end view drawing picture collected in automatic shaft fixing process;
Fig. 6 is integrated polarization-preserving fiber axis fixing instrument automatic shaft fixing process flow diagram of the present invention.
In figure:
1-image procossing and control module 2-first motion control board 3-manual displacement platform
4-optical fibre rotator 5-polarization maintaining optical fibre 6-optical fiber pad
7-light source 8-microimaging head 9-microcobjective
10-lens barrel 11-CMOS camera 12-electricity driving displacement platform
13-second motion control board 14-touch-screen 15-mouse
16-direct supply
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, based on the integrated polarization-preserving fiber axis fixing instrument of ARM, image acquisition units, image procossing and control module 1, movement executing mechanism and man-machine interaction unit is comprised.
Image acquisition units comprises light source 7, microcobjective 9, lens barrel 10, CMOS industrial camera 11 and microimaging 8;
Light source 7 divests the polarization maintaining optical fibre 5 of coat with 30 ° of oblique front irradiations in-60 ° of angles, and microcobjective 9 and polarization maintaining optical fibre 5 are coaxial, and CMOS camera 11 is connected with microcobjective 9 by lens barrel 10, and microimaging 8 is fixed on above polarization maintaining optical fibre.
Movement executing mechanism comprises optical fibre rotator 4, manual displacement platform 3, electricity driving displacement platform 12, optical fiber pad 6, first motion control board 2 and the second motion control board 13;
Polarization maintaining optical fibre 5 is fixed on optical fibre rotator 4, optical fibre rotator 4 is fixed on again on manual displacement platform 3, manually regulate displacement platform 3 and optical fiber pad 6 can change the locus of polarization maintaining optical fibre 5, optical fibre rotator 4 can be made to rotate polarization maintaining optical fibre 5 change its polarization angle by sending instruction to the first motion control board 2, lens barrel 10 is fixed on electricity driving displacement platform 12, by send to the second motion control board 13 instruction can control bit moving stage 12 along barrelshift to move radially thus the association of mobile lens barrel 10, object lens 9 and camera 11.Two 42BYGH type stepper motors that optical fibre rotator 4 and Electronic control platform 12 adopt working current different respectively realize motion, send to stepper motor the step motion that namely pulse signal can realize motor by motion control board, and then realize the rotation of optical fibre rotator and the tangential movement of motorized precision translation stage.
Man-machine interaction unit comprises touch-screen 14 and mouse 15 (optional);
Human-computer interaction interface adopts Qt exploitation, polarization maintaining optical fibre 5 is fixed on optical fibre rotator 4, microimaging 8 collection polarization maintaining optical fibre 5 side image export image procossing and control module 1 to, observe optical fiber side image on touch-screen 14, manually polarization maintaining optical fibre 5 is adjusted to microcobjective 9 coaxial, then its end view drawing picture through microcobjective 9 amplify after by CMOS camera 11 Real-time Collection, the image collected is transferred to image procossing and control module 1 by USB data line by CMOS camera 11, the sharpness of image procossing and control module 1 difference computed image and polarization angle, to the first motion control board 2, second motion control board 13 sends instruction, motion control board drives optical fibre rotator 4, the electric machine rotation of motor and displacement platform 12 is to realize auto-focusing and automatic shaft fixing.
As shown in Figure 2, microprocessor, memory module, communication interface, display module, debugging module and power module is comprised with the ARM chip image procossing that is core and control module 1.
Image procossing and control module 1 are connected with CMOS camera 11 and microimaging 8 respectively by two USB port, be connected with the first motion control board 2 and the second motion control board 13 respectively by two RS232 serial ports, be connected with touch-screen 14 by a LCD interface, be connected (optional) with mouse 15 by a USB port.
Microprocessor adopts the arm processor of Cortex-A9 series; Memory module adopts DDR3 as memory ram, and eMMC stores as FLASH; Communication interface comprises two RS232 serial ports and 3 USB interface, two RS232 serial ports are connected for sending movement instruction with the first motion control board 2, second motion control board 13 respectively, movement instruction can be converted into the phase current ordering about stepper motor and rotate by motion control board, 3 USB interface are connected with microimaging 8, CMOS camera 11 and mouse 15 respectively, wherein under a microimaging 8 use Linux, general driving V4L2 gathers image, and CMOS camera 11 adopts the special driving of built-in Linux to gather image; Display module is connected with capacitance touch screen 14 by the LCD interface of 45pin; Debugging module adopts 10 pin jtag interfaces, can connect JTAG emulator and emulate ARM kernel; Power module adopts 5V power adaptor receptacle, uses 5V direct supply 16 to power.
Integrated polarization-preserving fiber axis fixing instrument of the present invention utilizes ARM chip as controller, and control to compare with traditional PC, system bulk is little, cost is low, flexible and convenient to use; Design under completing the embedded environment of image capture module, motion-control module (comprising automatic shaft fixing structure and auto-focus structure) and human-computer interaction module, level of integrated system is high.
Autofocus Technology of the present invention can be divided into the focusing of fiber end face and the focusing two kinds of optical fiber pad, and wherein fiber end face auto-focus process as shown in Figure 4: first ARM processing module 1 sends instruction to the second motion control board 13 and object lens 9 are moved into place the transportable object distance maximum of moving stage 12.Then move object lens 9 with step pitch Δ L to fiber end face direction, fiber end face is gathered as discrete digital image by CMOS camera 11 and is transferred to ARM processing module 1 after object lens 9 amplify.The coloured image collected is converted to gray level image by ARM processing module 1, Laplace edge detection operator is used to carry out convolution to gray level image, calculate trellis diagram and have a gray-scale value C (i, j) quadratic sum as sharpness evaluation function L (x), i.e. L (x)=Σ
iΣ
jc (i, j)
2, wherein x is object lens 9 position coordinateses, and i is the horizontal ordinate of trellis diagram mid point, and j is the ordinate of trellis diagram mid point.Mobile object lens 9 are progressively near fiber end face, and calculate and record sharpness evaluation function L (x) that each walks fiber end face image, L (x) function curve as shown in Figure 3.If object lens 9 are at certain position x
0meet during place, L (x
0) be the maximum value of L (x) function curve and differ comparatively large with the functional value of neighbouring point, then think x
0it is the spike point of L (x) function curve.X is thought when spike point appears in L (x) function curve
0be the position that fiber end face focuses on, tentatively focused on.In (x0-Δ L, x0+ Δ L) scope, make step pitch Δ L=0.5* Δ L, again move object lens 9, repeat said process, find focal position.When Δ L is less than predetermined focusing accuracy, object lens 9 are moved to focal position now, fiber end face automatic focus completes.Automatic focus process and the fiber end face automatic focus of optical fiber pad are roughly similar, difference is, because sharpness function extreme point in object lens 9 moving process is more, the determination of the preliminary focus point that optical fiber pad focuses on can not simply confirm from first spike point, first can search out the preliminary focus point of fiber end face, then continue move object lens 9 to pad direction and calculate sharpness evaluation function from this point, using the preliminary focus point of next spike point as optical fiber pad, change step pitch focusing is afterwards just identical with fiber end face focusing.Autofocus Technology of the present invention utilizes image processing techniques, in conjunction with the feature of fiber end face and optical fiber pad image, select the sharpness function of Laplace operator computed image, feature according to sharpness function curve is focused respectively to fiber end face and optical fiber pad, and the change step pitch technology wherein adopted improves speed and the precision of focusing.
The core of automatic shaft fixing technology of the present invention is the detection in fiber end face polarization axle orientation.As shown in Figure 5, polarization maintaining optical fibre end view drawing picture has two stressed zones about fibre core symmetry, and the line at two centers, stressed zone is exactly the slow axis of polarization maintaining optical fibre, therefore can be realized the detection in polarization maintaining optical fibre polarization axle orientation by the pitch angle detecting this line.Detailed process is: object lens 9 are moved to the place of optical fiber 5 end face focusing by ARM processing module 1; CMOS camera 11 gathers fiber end face image and is transferred to ARM processing module 1; The coloured image collected is converted to gray-scale map by the embedded program implanted in ARM processing module 1, uses Gauss operator to obtain image f to gray-scale map filtering noise reduction; Utilize Da-Jin algorithm (Otsu method) that image f is converted to binary map, extract the profile of all bright area in binary map, utilize the characteristic informations such as the shape of polarization maintaining optical fibre two stressed zone, size, distance to find the profile of two stressed zones, thus confirm the position of stressed zone in image f; Extract stressed zone subimage in image f, antithetical phrase imagery exploitation Canny operator extraction marginal point, edge point carries out the point of iterative processing removal not on stress circle, utilize the gray-scale value feature of point near gray-scale map f marginal point, edge carries out sub-pix refinement, ellipse fitting is carried out to the marginal point after refinement, oval center and the center of circle of stress circle; Utilize two stress circle centers of circle namely can calculate the angle [alpha] of fiber end face polarization axle.Compare with traditional polarization-preserving fiber axis fixing technology, polarization axle detection technique of the present invention adopts digital image processing techniques, and principle simple, intuitive, be easy to realize automatic control, dead axle precision is better than 0.5 °.Wherein carry out the extraction of stressed zone according to the contour feature of stressed zone, identification is accurate and speed is fast; Utilize canny operator extraction marginal point and carry out sub-pix refinement, the positioning precision of sub-pix can be obtained.
As shown in Figure 6, the workflow complete based on the embedded polarization maintaining optical fibre automatic shaft fixing instrument of ARM of the present invention is: be fixed on by the polarization maintaining optical fibre 5 having divested coat on optical fibre rotator 4 and optical fiber pad 6, start automatic shaft fixing system and initialization, touch-screen 14 shows human-computer interaction interface, select " opening microimaging head " on the touchscreen, the situation of polarization maintaining optical fibre 5 in optical fiber pad 6 groove is transferred on touch-screen 14 and shows by camera 8, according to result manual adjustments displacement platform 3 and the pad 6 of display, makes optical fiber 5 parallel with object lens 9 optical axis, select " opening CMOS camera " and " searching reference angle " on touchscreen 14, the automatic mobile object lens 9 of ARM processing module 1 focus on optical fiber pad 6, camera 11 gathers pad image to processing module 1, Da-Jin algorithm binaryzation is utilized after image is converted to gray-scale map by the embedded program implanted in ARM processing module 1, with fitting a straight line pad coboundary, try to achieve reference angle β and show on the touchscreen, select " camera ROI is set " (ROI and area-of-interest on the touchscreen, camera only transmits this area image to ARM, arrange ROI can improve camera frame per second and improve the speed and accuracy rate that detect circle), ARM processing module 1 by object lens 9 auto-focusing to polarization maintaining optical fibre end face, stress circle profile is found according to the algorithm that epimere is mentioned, if successfully find stress circle profile, fiber end face place regional area is set to the ROI that CMOS camera 11 gathers, otherwise prompting user manually delimit ROI region, user can delimit ROI region on touchscreen 14 with mouse 15 or directly, select " detection polarization axle " on the touchscreen, the fiber end face image procossing that ARM processing module 1 pair of camera 11 collects, try to achieve polarization angle α according to above mentioned algorithm and show on the touchscreen, select " dead axle " on touchscreen 14, arm processor 1 is according to recording reference angle β, polarization angle α and predetermined dead axle angle, calculate optical fiber need by rotate angle γ=| alpha-beta-dead axle angle |, calculate step number and the direction of the stepper motor needs rotation of optical fibre rotator 4 according to γ value, send movement instruction to control panel 2 and control fiber spinning, arm processor 1 detects postrotational optical fiber polarisation angle, calculation deviation angle γ, judge whether γ reaches the precision of specifying, if γ does not reach designated precision, continue spin fiber according to γ value, otherwise then at this station acquisition N width image calculation deviation angle mean value, again judge whether to reach designated precision, if do not reached, continue spin fiber, otherwise dead axle terminates, user's dead axle is pointed out to terminate at touch-screen 14.Dead axle process integration of the present invention auto-focusing and automatic shaft fixing function, achieve the robotization of whole dead axle process; Adopt closed-loop control and dead axle final stage to ask the technology of deviation angle mean value dead axle, improve the precision of dead axle.
Claims (5)
1., based on the integrated polarization-preserving fiber axis fixing instrument of ARM, comprise image acquisition units, image procossing and control module, movement executing mechanism and man-machine interaction unit;
Image acquisition units comprises light source, microcobjective, lens barrel, CMOS industrial camera and microimaging head; Light source divests the polarization maintaining optical fibre of coat with 30 ° of oblique front irradiations in-60 ° of angles, and coaxially, CMOS camera is connected with microcobjective by lens barrel, and microimaging head is fixed on above polarization maintaining optical fibre for microcobjective and polarization maintaining optical fibre;
Movement executing mechanism comprises optical fibre rotator, manual displacement platform, electricity driving displacement platform, optical fiber pad, the first motion control board and the second motion control board; Polarization maintaining optical fibre is fixed on optical fibre rotator, optical fibre rotator is fixed on manual displacement platform, displacement platform and optical fiber pad is manually regulated to change the locus of polarization maintaining optical fibre, optical fibre rotator rotation polarization maintaining optical fibre is made to change its polarization angle by sending instruction to the first motion control board, lens barrel is fixed on electricity driving displacement platform, by send to the second motion control board instruction control bit moving stage along barrelshift to move radially, thus the association of mobile lens barrel, object lens and camera;
Man-machine interaction unit comprises touch-screen, polarization maintaining optical fibre is fixed on optical fibre rotator, microimaging head gathers polarization maintaining optical fibre side image and exports image procossing and control module to, observe optical fiber side image on touch-screen, manually polarization maintaining optical fibre is adjusted to microcobjective coaxial, end view drawing picture through microcobjective amplify after by CMOS camera Real-time Collection, the image collected is transferred to image procossing and control module by USB data line by CMOS camera, the sharpness of image procossing and control module difference computed image and polarization angle, to the first motion control board, second motion control board sends instruction, motion control board drives optical fibre rotator, the electric machine rotation of motor and displacement platform realizes auto-focusing and automatic shaft fixing,
Image procossing and control module comprise microprocessor, memory module, communication interface, display module, debugging module and power module;
Microprocessor adopts arm processor, the sharpness of computed image and polarization angle, and send instruction to the first motion control board, the second motion control board, memory module stores data; Communication interface comprises RS232 serial ports and USB interface, RS232 serial ports is connected with the first motion control board, the second motion control board respectively, for sending movement instruction, USB interface is connected with microimaging head and CMOS camera respectively, and display module is connected with capacitance touch screen by LCD interface; Debugging module adopts jtag interface; Power module adopts DC power supply.
2. the integrated polarization-preserving fiber axis fixing instrument based on ARM according to claims 1, man-machine interaction unit also comprises mouse, and mouse is connected with control module with image procossing by USB port.
3., based on the fiber end face Atomatic focusing method of polarization-preserving fiber axis fixing instrument described in claim 1, be specially: first ARM processing module to the second motion control board send instruction object lens are moved into place moving stage can the object distance maximum of movement; Then move object lens with step pitch Δ L to fiber end face direction, fiber end face is discrete digital image by CMOS collected by camera and is transferred to ARM processing module after object lens amplify; The coloured image collected is converted to gray level image by ARM processing module, Laplace edge detection operator is used to carry out convolution to gray level image, calculate trellis diagram and have a gray-scale value C (i, j) quadratic sum as sharpness evaluation function L (x), i.e. L (x)=Σ
iΣ
jc (i, j)
2, wherein x is object lens position coordinate, and i is the horizontal ordinate of trellis diagram mid point, and j is the ordinate of trellis diagram mid point; Mobile object lens, progressively near fiber end face, calculate and record sharpness evaluation function L (x) that each walks fiber end face image, if object lens are at certain position x
0meet during place, L (x
0) be the maximum value of L (x) function curve, then think x
0it is the spike point of L (x) function curve; X is thought when spike point appears in L (x) function curve
0be the position that fiber end face focuses on, tentatively focused on; In (x0-Δ L, x0+ Δ L) scope, make step pitch Δ L=0.5* Δ L, again move object lens, repeat said process, find focal position; When Δ L is less than predetermined focusing accuracy, object lens are moved to focal position now, fiber end face automatic focus completes.
4., based on the optical fiber pad automatic focus process of polarization-preserving fiber axis fixing instrument described in claim 1, be specially: first ARM processing module to the second motion control board send instruction object lens are moved into place moving stage can the object distance maximum of movement; Then move object lens with step pitch Δ L to fiber end face direction, the end face of optical fiber and pad is discrete digital image by CMOS collected by camera and is transferred to ARM processing module after object lens amplify; The coloured image collected is converted to gray level image by ARM processing module, Laplace edge detection operator is used to carry out convolution to gray level image, calculate trellis diagram and have a gray-scale value C (i, j) quadratic sum as sharpness evaluation function L (x), i.e. L (x)=Σ
iΣ
jc (i, j)
2, wherein x is object lens position coordinate, and i is the horizontal ordinate of trellis diagram mid point, and j is the ordinate of trellis diagram mid point; Mobile object lens, progressively near fiber end face, calculate and record sharpness evaluation function L (x) that each walks end view drawing picture, if object lens are at certain position x
0meet during place, L (x
0) be the maximum value of L (x) function curve, then think x
0it is the spike point of L (x) function curve; X is thought when first spike point appears in L (x) function curve
0be the position that fiber end face focuses on, fiber end face has tentatively focused on; Then continue mobile object lens with step pitch Δ L to optical fiber pad direction, gather image and calculate sharpness evaluation function L (x); When spike point x appears in L (x) function curve again
1time think x
1be the position that optical fiber pad focuses on, optical fiber pad has tentatively focused on; In (x1-Δ L, x1+ Δ L) scope, make step pitch Δ L=0.5* Δ L, again move object lens, repeat said process, find focal position; When Δ L is less than predetermined focusing accuracy, object lens are moved to focal position now, the automatic focus of optical fiber pad completes.
5. the detection based on the fiber end face polarization axle orientation of polarization-preserving fiber axis fixing instrument described in claim 1 is specially: polarization maintaining optical fibre end view drawing picture has two stressed zones about fibre core symmetry, the line at center, two stressed zones is exactly the slow axis of polarization maintaining optical fibre, therefore can be realized the detection in polarization maintaining optical fibre polarization axle orientation by the pitch angle detecting this line; Detailed process is:
Object lens are moved to the place of fiber end face focusing by ARM processing module; CMOS collected by camera fiber end face image is also transferred to ARM processing module; The coloured image collected is converted to gray-scale map by ARM processing module, uses Gauss operator to obtain image f to gray-scale map filtering noise reduction; Utilize Da-Jin algorithm that image f is converted to binary map, extract the profile of all bright area in binary map, utilize the shape of polarization maintaining optical fibre two stressed zone, size, distance feature information to find the profile of two stressed zones, confirm the position of stressed zone in image f; Extract stressed zone subimage in image f, antithetical phrase imagery exploitation Canny operator extraction marginal point, edge point carries out iterative processing, remove the point not on stress circle, utilize the gray-scale value feature of point near gray-scale map f marginal point, edge carries out sub-pix refinement, carries out ellipse fitting to the marginal point after refinement, oval center and the center of circle of stress circle; Two stress circle centers of circle are utilized to calculate the angle [alpha] of fiber end face polarization axle.
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| CN105759390A (en) * | 2016-04-27 | 2016-07-13 | 北京航空航天大学 | Automatic positioning and placing apparatus and method for fiber |
| CN106569344A (en) * | 2015-10-08 | 2017-04-19 | 南京南瑞继保电气有限公司 | Axis measuring and axis rotating device for polarization maintaining optical fiber |
| CN108646353A (en) * | 2018-04-28 | 2018-10-12 | 北京航空航天大学 | A kind of fiber-to-waveguide based on image procossing is automatically aligned to coupling instrument |
| CN109883587A (en) * | 2019-01-08 | 2019-06-14 | 河北大学 | A kind of polarization-preserving fiber axis fixing cloth fibre device and method |
| CN111964872A (en) * | 2020-07-08 | 2020-11-20 | 暨南大学 | Optical fiber axial nondestructive online detection device and method |
| CN112444959A (en) * | 2020-11-20 | 2021-03-05 | 中电科仪器仪表(安徽)有限公司 | Device and method for processing optical fiber image ghost |
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| CN108646353B (en) * | 2018-04-28 | 2019-12-17 | 北京航空航天大学 | Optical fiber-waveguide automatic alignment coupler based on image processing |
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| CN109883587B (en) * | 2019-01-08 | 2021-05-28 | 河北大学 | Polarization maintaining optical fiber fixed-axis fiber distribution device and method |
| CN111964872A (en) * | 2020-07-08 | 2020-11-20 | 暨南大学 | Optical fiber axial nondestructive online detection device and method |
| CN112444959A (en) * | 2020-11-20 | 2021-03-05 | 中电科仪器仪表(安徽)有限公司 | Device and method for processing optical fiber image ghost |
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