CN107271142B - Real-time optical fiber positioning device and localization method based on center opening type 4 quadrant detector - Google Patents
Real-time optical fiber positioning device and localization method based on center opening type 4 quadrant detector Download PDFInfo
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- CN107271142B CN107271142B CN201710362698.5A CN201710362698A CN107271142B CN 107271142 B CN107271142 B CN 107271142B CN 201710362698 A CN201710362698 A CN 201710362698A CN 107271142 B CN107271142 B CN 107271142B
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
Abstract
The invention discloses a kind of real-time optical fiber positioning devices based on center opening type 4 quadrant detector, comprising: from the received astrology hot spot of telescopic system；Convergent lens: for assembling to astrology hot spot, hot spot is formed in the laser irradiation after convergence to center opening type 4 quadrant detector；Center opening type 4 quadrant detector: center offers aperture, and for determining spot center position, spot center position is sent to optoelectronic position receiver later；Optoelectronic position receiver: spot center position is sent to control platform later by the spot center position sent for receiving center opening type 4 quadrant detector；Control platform: for adjusting the position of optical fiber according to spot center position；Optical fiber: optical fiber one end is inserted in the central small hole of center opening type 4 quadrant detector.The invention also discloses the methods positioned using aforementioned real-time optical fiber positioning device.The present invention is successfully realized the real-time closed-loop monitoring and feedback of optical fiber.
Description
Technical field
The present invention relates to fiber orientation technical fields, more particularly to based on the real-time of center opening type 4 quadrant detector
Optical fiber positioning device and localization method.
Background technique
Since the eighties in last century, optical fiber technology is gradually penetrated into astronomical observation, and astronomy enters " multiband, big
In the sample, high information quantity " epoch, the breach that large-scale multi-object fiber spectrographs are toured the heavens as astronomical observation, the purpose is to obtain
Fetch by 100,000, million even necessarily in terms of celestial body spectrum, available imaging tours the heavens the day more abundant that cannot be provided
Body information.
Mainly there is the Ying Ao observatory of Australia equipped with multi objects fiber spectrograph telescope or the plan of touring the heavens in the world
(AAO) 2dF, AA Ω, 6dF, U.S. SDSS, the GAIA of European Space Agency, Japan SABURA etc..Domestic multi objects fiber spectrograph is hoped
Remote mirror has LAMOST telescope.Wherein SDSS tour the heavens project galaxy formed and evolution in terms of make remarkable achievements,
The LAMOST in China is also just carrying out the fixed star sky patrol in a phase milky way galaxy.
In multi-object fiber spectrographs are toured the heavens, optical fibre positioning system occupies highly important status, the number of fiber orientation
Amount and accuracy directly influence the efficiency and quality of sky patrol.Ying Ao observatory 2dF project optical fiber uses magnetic clasp surely
Positioning method, magnetic clasp positioning are that optical path is turned 90 ° by small prism to enter optical fiber incidence end, and one block of small magnetic is placed below prism
Stone is adsorbed on iron-based focal plane substrate by mechanical arm, and optical fiber then lies on focal plane substrate incident light guiding to spectrum
In instrument.Its fiber orientation mode used of the SDSS digital sky survey plan in the U.S. carries out for the well plate method mode to be drilled by aluminium sheet
Fiber orientation is punched on one piece about 500 millimeters of diameter of aluminium sheet by preset coordinate, and punching coordinate is according to wait see
The area Ce Tian celestial coordinates is by depending on being converted on focal plane plate.The positioning method that 4000 optical fiber of LAMOST uses is double
Rotary parallel controllable optical fibre positioning system, in position fixing process, on the one hand optical fiber makees center steering movement with eccentric stent, separately
On the one hand make eccentric rotary motion around eccentric axis of rotation in eccentric stent again, the optical fiber in motion process receive end face relative to
Telescope optic axis does not generate deflection, and moves on telescope focal plane always, will not defocus.
Generally speaking, current optical fibre positioning system is monitored and is fed back without the real-time closed-loop of successfully realization optical fiber,
It is unable to satisfy the demand of higher precision fiber orientation.
Summary of the invention
Goal of the invention: the object of the present invention is to provide one kind by realizing that optical fiber connects to 4 quadrant detector center opening
Connect and transmit the real-time optical fiber positioning device and localization method based on center opening type 4 quadrant detector of spot signal.
Technical solution: the real-time optical fiber positioning device of the present invention based on center opening type 4 quadrant detector, packet
It includes:
From the received astrology hot spot of telescopic system；
Convergent lens: for assembling to astrology hot spot, the laser irradiation after convergence to center opening type four-quadrant is visited
It surveys on device and forms hot spot；
Center opening type 4 quadrant detector: center offers aperture, for determining spot center position, later by hot spot
Center is sent to optoelectronic position receiver；
Optoelectronic position receiver: the spot center position sent for receiving center opening type 4 quadrant detector, later
Spot center position is sent to control platform；
Control platform: for adjusting the position of optical fiber according to spot center position；
Optical fiber: optical fiber one end is inserted in the central small hole of center opening type 4 quadrant detector, another termination spectrometer.
Further, the center opening type 4 quadrant detector determines spot center position by formula (1)
In formula (1),For the average value of m,For the average value of n,For the average value of p,x0And y0It is the instantaneous value of spot center coordinate, σ2For the variance of two-dimensional Gaussian function；?
During this, the position for limiting spot center point existsIn region, wherein r is center open cell type 4 quadrant detector
Central small hole radius.
Further, the size of the central small hole of center opening type 4 quadrant detector is by center opening type 4 quadrant detector
Photosurface and the distance between optical fiber incidence end face, optics of telescope performance, dome seeing determine.
Further, pass through the sunset glow real-time judge spot center position of four quadrants of center opening type 4 quadrant detector
It sets.
It is positioned using the real-time optical fiber positioning device of the present invention based on center opening type 4 quadrant detector
Method, by the central coaxial of the center of center opening type 4 quadrant detector central small hole and optical fiber be arranged, by control platform
It is set as carrying out the data of center open cell type 4 quadrant detector the integration processing of once per second, real-time fitting three-dimensional Gaussian is bent
Face figure, and using the analysis completion technology of block image missing, the Gauss curved of missing is subjected to completion, with this final determining hot spot
Center, and in real time adjust center opening type 4 quadrant detector focal plane angles and positions so that center opening type four
The central small hole of quadrant detector is directed at spot center position.
The utility model has the advantages that the invention discloses a kind of real-time optical fiber positioning devices based on center opening type 4 quadrant detector
And localization method realizes the coupling of more accurate astrology hot spot and optical fiber by the fixed optical fiber of 4 quadrant detector center opening
Positioning.It is had the following beneficial effects: compared with prior art first is that being put forward for the first time based on center opening type 4 quadrant detector
Optical fiber positioning device；Second is that open cell type 4 quadrant detector centre bore can just fix optical fiber, make astrology hot spot and optical fiber more
It couples well, and solves the non-of 4 quadrant detector element after center opening using Gauss curve fitting algorithm combination image procossing
Mark property problem；Third is that being successfully realized the real-time closed-loop monitoring and feedback of optical fiber.
Detailed description of the invention
Fig. 1 is the schematic diagram of the center opening type 4 quadrant detector in the specific embodiment of the invention；
Fig. 1 (a) is the schematic diagram that astrology hot spot and center opening type 4 quadrant detector center zero deflection sunset glow are fixed；
Fig. 1 (b) is astrology hot spot and the schematic diagram that center opening type 4 quadrant detector center has deviation sunset glow to fix；
Fig. 2 is the structural block diagram of the optical fiber positioning device in the specific embodiment of the invention；
Fig. 3 is the double back cyclone schematic diagram in the specific embodiment of the invention.
Specific embodiment
With reference to the accompanying drawings and detailed description, technical solution of the present invention is further introduced.
The specific embodiment of the invention discloses a kind of real-time fiber orientation based on center opening type 4 quadrant detector
Device, as shown in Figure 2, comprising:
From the received astrology hot spot 1 of telescopic system；
Convergent lens 2: for being assembled to astrology hot spot 1, the laser irradiation after convergence to center opening type four-quadrant
Hot spot is formed on detector 3；
Center opening type 4 quadrant detector 3: center offers aperture, for determining spot center position, later by light
Spot center is sent to optoelectronic position receiver 5；Fig. 1 is the schematic diagram of center open cell type 4 quadrant detector 3, wherein Fig. 1
(a) schematic diagram fixed for astrology hot spot and 3 center zero deflection sunset glow of center opening type 4 quadrant detector, Fig. 1 (b) are the astrology
The schematic diagram that hot spot and 3 center of center opening type 4 quadrant detector have deviation sunset glow to fix；
Optoelectronic position receiver 5: the spot center position sent for receiving center opening type 4 quadrant detector 3, it
Spot center position is sent to control platform 6 afterwards；
Control platform 6: for according to spot center position adjust optical fiber 4 position, detailed process include: data collection,
Gauss curve fitting, missing block image completion；
Optical fiber 4: 4 one end of optical fiber is inserted in the central small hole of center opening type 4 quadrant detector 3.
Wherein, center opening type 4 quadrant detector 3 determines spot center position by formula (1)
The derivation process of a following formula (1) is described below:
The Energy distribution approximation of laser facula meets dimensional gaussian distribution, and hot spot Luminance edge is fuzzy, therefore uses
Spot center position is determined based on the Gauss curved fitting process of gray scale.
If the hot spot intensity profile approximation on center opening type 4 quadrant detector 3 meets two-dimensional Gaussian function:
In formula (2), x0, y0It is the instantaneous value of spot center coordinate, σ2For the variance of two-dimensional Gaussian function, with defocusing amount, object
Related away from, focal length etc., A is undetermined coefficient, related with the property of hot spot.As can be seen from the above equation, peak value position is light
The center of spot.Logarithm is taken to above formula both sides:
It enables
Former formula abbreviation are as follows:
m(x2+y2)+nx+py-q=Inf (x, y) (5)
Using principle of least square method, formula (1) can be obtained by matrixing.
In present embodiment, highly sensitive center opening type 4 quadrant detector 3 can record the data of X, Y, in
After heart open cell type 4 quadrant detector 3 obtains data, it is transferred to optoelectronic position receiver 5, is carried out in control platform a series of
Later stage work, main includes two aspects: the fitting of three-dimensional Gaussian curved surface, the completion of missing image and the determination at center.
Since the sampling frequency of center opening type 4 quadrant detector 3 is 2.5kHz, 2500 groups of numbers can be generated each second
According to data volume is larger, therefore the result that can be preferably fitted.Still further aspect considers that star spot moves in 1 seconds
Dynamic distance is smaller, therefore the influence of time span is equally smaller, therefore selected locating periodically is 1.0 seconds.What transmission per second generated
The algorithm that 2500 groups of data enter pre-programmed mistake carries out three-dimensional Gaussian surface fitting, obtains the Gauss map of center circle domain missing
Picture.
Later, three-dimensional Gaussian image enters the missing image completion stage.Since Gauss curved smoothness is fabulous, can use
Gradient method is progressive close, takes gradient from each side of circle, the annular section that about 1 micron of forward prediction width, since aperture size is smaller,
About in 300-400 micron dimension, thus by hundreds of predictions can completion Gaussian image, runing time is relatively fewer.
Finally, computer analyzes the three-dimensional Gaussian image after improving, luminous flux maximum value is taken in limited range
Point (x0, y0) it is spot center position.It is driven by mechanical device, the adjustment alignment of focal plane, light spot received can be carried out in real time
Signal.
Mechanical device uses the similar double back cyclone of LAMOST telescope, as shown in figure 3, there are two axis for device --- in
Heart rotating shaft and eccentric axis of rotation, focal plane rotates respectively with two axis can cover biggish area, can be used for after coupling larger
The star spot signal acquisition in area sky day region.
Present embodiment is also disclosed using the real-time fiber orientation dress based on center opening type 4 quadrant detector
The method positioned is set, the central coaxial at the center of 3 central small hole of center opening type 4 quadrant detector and optical fiber 4 is set
It sets, sets control platform 6 to carry out the data of center open cell type 4 quadrant detector 3 the integration processing of once per second, it is real
When be fitted three-dimensional Gaussian surface chart, and using the analysis completion technology of block image missing, the Gauss curved of missing is subjected to completion,
With this final center for determining hot spot, and the focal plane angles and positions of center opening type 4 quadrant detector 3 are adjusted in real time,
So that the central small hole of center opening type 4 quadrant detector 3 is directed at spot center position.
Claims (1)
1. the method positioned using the real-time optical fiber positioning device based on center opening type 4 quadrant detector, feature are existed
In: real-time optical fiber positioning device includes:
From the received astrology hot spot (1) of telescopic system；
Convergent lens (2): for being assembled to astrology hot spot (1), the laser irradiation after convergence to center opening type four-quadrant
Detector forms hot spot on (3)；
Center opening type 4 quadrant detector (3): center offers aperture, for determining spot center position, later by hot spot
Center is sent to optoelectronic position receiver (5)；
Optoelectronic position receiver (5): the spot center position sent for receiving center opening type 4 quadrant detector (3), it
Spot center position is sent to control platform (6) afterwards；
Control platform (6): for adjusting the position of optical fiber (4) according to spot center position；
Optical fiber (4): optical fiber (4) one end is inserted in the central small hole of center opening type 4 quadrant detector (3), another termination spectrum
Instrument；
The center opening type 4 quadrant detector (3) determines spot center position by formula (1)
In formula (1),For the average value of m,For the average value of n,For the average value of p,
x0And y0It is the instantaneous value of spot center coordinate, σ2For the variance of two-dimensional Gaussian function；In the process, spot center point is limited
Position existIn region, wherein r is the radius of the central small hole of center open cell type 4 quadrant detector (3)；
The real-time optical fiber positioning device further includes mechanical device, and there are two axis, i.e. center steering axis and bias to return for mechanical device
Shaft；
The central coaxial of the center of center opening type 4 quadrant detector (3) central small hole and optical fiber (4) is arranged, control is flat
Platform (6) is set as carrying out the data of center open cell type 4 quadrant detector (3) the integration processing of once per second, real-time fitting three
Gauss curved figure is tieed up, and using the analysis completion technology of block image missing, the Gauss curved of missing is subjected to completion, it is final with this
It determines the center of hot spot, and adjusts the focal plane angles and positions of center opening type 4 quadrant detector (3) in real time, so that in
The central small hole of heart open cell type 4 quadrant detector (3) is directed at spot center position；It is described to mend the Gauss curved of missing
It is realized full by following procedure: it is progressive close to Gauss curved using gradient method, gradient is taken from each side of circle, forward prediction width 1 is micro-
The annular section of rice so realizes completion by hundreds of predictions.
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| CN108427097B (en) * | 2018-01-26 | 2020-06-16 | 深圳班翟机器人有限公司 | Linear array photosensitive device laser positioning method, device, terminal and computer readable storage medium |
| CN109061831B (en) * | 2018-09-19 | 2021-01-15 | 西安理工大学 | Wireless laser communication reflection type aiming tracking system and laser aiming tracking method |
| JP2020051797A (en) * | 2018-09-25 | 2020-04-02 | 横河電機株式会社 | Measuring device and measurement method |
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