CN206670570U - A kind of optical fiber distance measurement system - Google Patents
A kind of optical fiber distance measurement system Download PDFInfo
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- CN206670570U CN206670570U CN201720360622.4U CN201720360622U CN206670570U CN 206670570 U CN206670570 U CN 206670570U CN 201720360622 U CN201720360622 U CN 201720360622U CN 206670570 U CN206670570 U CN 206670570U
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 64
- 238000005259 measurement Methods 0.000 title claims abstract description 39
- 239000000835 fiber Substances 0.000 claims abstract description 52
- 238000005070 sampling Methods 0.000 claims abstract description 40
- 238000012360 testing method Methods 0.000 claims abstract description 30
- 230000003287 optical effect Effects 0.000 claims abstract description 26
- 230000001427 coherent effect Effects 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 15
- 101100117236 Drosophila melanogaster speck gene Proteins 0.000 claims 2
- 230000003362 replicative effect Effects 0.000 abstract description 7
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- 230000000694 effects Effects 0.000 abstract description 2
- 238000003384 imaging method Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 8
- 239000000523 sample Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 238000004377 microelectronic Methods 0.000 description 3
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Abstract
The utility model discloses a kind of optical fiber distance measurement system, after improvement, the end face of testing fiber array is placed near the front focal plane of microcobjective, and object distance is slightly larger than focal length, sampling diaphragm is placed on the back focal plane of microcobjective, and image collection chip is placed in the image planes of microcobjective.Coherent source is divided into multichannel by optical branching device, it is respectively connected to the tail optical fiber of testing fiber array, it is emitted again from fiber end face, successively by microcobjective, sampling diaphragm, it is incident on image collection chip, the image of hot spot at fiber end face is obtained, then is analyzed by image processing module, obtains optical fiber pitch information.Due to sampling the effect of diaphragm, the replicating array of hot spot pattern is obtained in image planes, array pitch depends on the cycle of sampling diaphragm, as the reference yardstick in measurement, can remove the standard component needed for conventional test system from, improve testing efficiency.
Description
Technical field
Optical fiber distance measurement field is the utility model is related to, is especially a kind of optical fiber distance measurement system.
Background technology
Optical fiber has a wide range of applications in fields such as communication, sensings, in the optical fibre device of some multiports, such as big rule
The photoswitch of mould, people need optical fiber lining up equidistant array, the input/output end port as optical device.The fibre of optical fiber
Core size is very small, generally only 10 microns, is arranged with very high required precision to optical fiber, it usually needs reach 0.5
Micron is following, therefore to the high-acruracy survey of optical fiber spacing, it appears it is particularly important.
Found by retrieval, patent No. CN201010042694.7 invention provides a kind of survey of length difference of array fibers
Amount method, including：The first step, setup test device, including：One wideband light source, one have an input port and first and second
The optical circulator of output port, one 1 × 2 photo-couplers, a multichannel array optical fiber and a spectroanalysis instrument；Second step, by light
The input port of circulator and the wideband light source optical coupling, and make the first output end and 1 × 2 photo-coupler of optical circulator
Input optical coupling, second output port and spectroanalysis instrument optical coupling, two output ends of 1 × 2 photo-coupler with leading to more
Channel array optical fiber any two-way optical fiber to be tested each optical coupling, and free space range (FSR) data value, then be converted into
Free space range (FSRv) data value of frequency representation；3rd step, the to be measured of multichannel array optical fiber is calculated by formula
Two-way gap fiber d values are tried, when more than 0.2mm, long end optical fiber is ground, reaches requirement.
Patent No. CN201120390099.2 utility model proposes a kind of Fibre Optical Sensor microspur measuring system, including light
Source, photo-detector, sensor probe, reflector element, wireless transmitter module, wireless receiving module, processing module；The sensor
Probe receives the incident light that light source is sent, and after processing, obtained reflected light is sent to photo-detector；The photodetector
The optical signal received is converted into electric signal, after processing, sent by wireless transmitter module, wireless receiving module to processing
Module；The processing module is set according to existing for the optical signal size that photo-detector receives with fiber end face to the distance of reflecting surface
Determine functional relation measurement distance.By the utility model Fibre Optical Sensor microspur measuring system, can work more severe in the wild
Environment, work long hours, realize unmanned monitoring and the early warning of slight distance or ohject displacement.
The patent No. CN201610175086.0 disclosure of the invention optical fiber detector of a kind of kilometer of level measurement distance, its
It is characterised by including：Swept laser source, PC modules, linear scan drive control module, coupler, optical fiber to be detected, the coupling
The 3rd pin and the 4th pin for coupling are provided with clutch, the 3rd pin is connected with reference signal branch road, and described the
Four pins are connected with control circuit module, the control circuit module include the encoder that is sequentially connected in series and with the encoder phase
Tie point even, the first polarizing beam splitter that the tie point includes being serially connected, the first balance receiver and first flat
Square wave filter, the encoder are connected with the 4th pin.
However, the measurement to fiber array spacing, typically first passes through image system and is amplified, then pass through image procossing skill
Art, analysis obtain the distance between every optical fiber image, divided by the multiplying power of image system, finally give optical fiber spacing.However, shadow
The ratio of image distance and object distance when depending on measuring every time as the multiplying power of system, it is difficult to obtain exact value.Therefore, generally by a mark
The sample of object staff degree, object plane is placed in simultaneously with testing fiber end face, as the reference yardstick in measurement.Measurement is required for marking every time
Quasi- part, inconvenience is brought to measurement process.
Existing measurement scheme, because, without sampling diaphragm, can only obtain one as shown in Figure 4 b at the back focal plane of microcobjective
The hot spot pattern of group amplification, the hot spot pattern spacing d in image planes is obtained by graphical analysis2, by the way that object plane optical fiber is calculated
SpacingHowever, the enlargement ratio β of imaging system depends on object distance l1, because the focusing situation in imaging process can not
Ensure uniformity, it is impossible to obtain l1Exact value, cannot also measure optical fiber spacing d1Exact value.Therefore, generally by a mark
The sample of object staff degree, object plane is placed in simultaneously with testing fiber end face, as the reference yardstick in measurement.
Utility model content
Therefore, in order to solve above-mentioned deficiency, the utility model provides a kind of optical fiber distance measurement system herein, can be to light
Fine spacing carries out the optical system of high-acruracy survey, its standard component without generally use in the prior art, can improve test effect
Rate.
The utility model is achieved in that a kind of optical fiber distance measurement system of construction, to fiber array end face
Optical fiber spacing measure, it is characterised in that：It includes a coherent source, an optical branching device, a testing fiber battle array
Row, a microcobjective, a sampling diaphragm, an image collection chip and an image processing module；Wherein, coherent source
It is connected with optical branching device, optical branching device is connected with testing fiber array, after microcobjective is located at light-metering fibre array, samples diaphragm position
Between microcobjective and image collection chip, image collection chip is connected with image processing module.
The fiber array of spacing to be measured, its end face are object plane, be placed in microcobjective front focal plane nearby (object distance slightly larger than Jiao
Away from), sampling diaphragm is placed on the back focal plane of microcobjective, and image collection chip is placed in the image planes of microcobjective.Coherent source
Multichannel is divided into by optical branching device, is respectively connected to the tail optical fiber of testing fiber array, then is emitted from fiber end face, successively by micro-
Object lens, sampling diaphragm, are incident on image collection chip, obtain the image of hot spot at fiber end face, then by picture processing chip
Analyzed, obtain optical fiber pitch information.
As the improvement of above-mentioned technical proposal,
A kind of optical fiber distance measurement system, the coherent source are divided into multichannel by optical branching device, are respectively connected to treat
The tail optical fiber of light-metering fibre array, from the hot spot of multifiber end face output, from same coherent source, therefore have between each other
Stable phase relation, belongs to relevant photoimaging；Coherent source is divided into multichannel by optical branching device first, is respectively connected to testing fiber
In more tail optical fibers of array, then it is emitted from fiber end face, successively by microcobjective, sampling diaphragm, is incident on IMAQ
On chip, the image of hot spot at fiber end face is obtained, then is analyzed by image processing module, obtains optical fiber pitch information.
As the improvement of above-mentioned technical proposal,
A kind of optical fiber distance measurement system, the front focal plane that the end face of the testing fiber array is placed in microcobjective are attached
Closely, object distance is slightly larger than focal length；Obtain high magnification imaging.
As the improvement of above-mentioned technical proposal,
A kind of optical fiber distance measurement system, sampling diaphragm is placed on the back focal plane of microcobjective, according to Fourier light
Theory, it is also the spatial frequency spectrum face of imaging object herein.Image collection chip is placed in the image planes of microcobjective, obtains optical fiber
The light spot image of end, imaging multiplying power β=l2/l1.
As the improvement of above-mentioned technical proposal,
A kind of optical fiber distance measurement system, image collection chip are placed in the image planes of microcobjective.
As the improvement of above-mentioned technical proposal,
A kind of optical fiber distance measurement system, sampling diaphragm is a slit array, slit length along the y-axis direction, respectively
Slit arranges along the x-axis direction, spacing t1, and the optical fiber in testing fiber array arranges along the y-axis direction；Because sampling the work of diaphragm
With obtaining the replicating array of hot spot pattern in image planes, array pitch depends on the cycle of sampling diaphragm, as the reference in measurement
Yardstick, the standard component needed for conventional test system can be removed from.
Sampling diaphragm is a slit array, and its cycle, this spacing can be made, it is known that then understanding the spacing of copying image array
With reference to yardstick, to analyze the optical fiber spacing in single image copy according to this.The week of sampling diaphragm is depended on reference to the precision of yardstick
Phase precision, sampling diaphragm is made with microelectronic technique, precision easily reaches less than 0.1 micron, meets measurement needs.
The utility model has the following advantages that：Optical fiber distance measurement system described in the utility model, has the following advantages that：
Advantage 1：The utility model sets a sampling diaphragm with illumination of coherent light source in the back focal plane of microcobjective,
According to Fourier optics principle, the replicating array of light spot image at fiber end face will be obtained in image planes, array pitch depends on adopting
The cycle of sample diaphragm, can be as the reference yardstick in measurement.
Advantage 2：Optical fiber spacing test system described in the utility model, it includes a coherent source, an optical branching
Device, a testing fiber array, a microcobjective, a sampling diaphragm, an image collection chip and an image procossing
Module.
The fiber array of spacing to be measured, its end face are object plane, be placed in microcobjective front focal plane nearby (object distance slightly larger than Jiao
Away from), sampling diaphragm is placed on the back focal plane of microcobjective, and image collection chip is placed in the image planes of microcobjective.Coherent source
Multichannel is divided into by optical branching device, is respectively connected to the tail optical fiber of testing fiber array, then is emitted from fiber end face, successively by micro-
Object lens, sampling diaphragm, are incident on image collection chip, obtain the image of hot spot at fiber end face, then by picture processing chip
Analyzed, obtain optical fiber pitch information.Standard component of the utility model without generally use in the prior art, can improve test
Efficiency.
Advantage 3：The hot spot that the utility model exports from multifiber end face, from same coherent source, therefore mutually
Between there is stable phase relation, belong to relevant photoimaging.In order to obtain high magnification imaging, fiber end face is usually placed in micro-
Near the front focal plane of object lens, theoretical according to Fourier optics, the back focal plane of microcobjective is its frequency plane, is set on frequency plane
Sampling diaphragm, spatial sampling is carried out to thing frequency spectrum, the result is that being on image collection chip in image planes, obtains light spot image
Replicating array (conventional image system only has an image), array pitch depend on the cycle of sampling diaphragm.
Advantage 4：The utility model sampling diaphragm is a slit array, and its cycle is, it is known that then understand copying image array
Spacing, this spacing can be used as refer to yardstick, according to this analysis single image copy in optical fiber spacing.Taken with reference to the precision of yardstick
Certainly in the cycle precision of sampling diaphragm, sampling diaphragm is made with microelectronic technique, precision easily reaches less than 0.1 micron, full
Foot measurement needs.
Brief description of the drawings
Fig. 1 is optical fiber distance measurement system architecture
Fig. 2 is microcobjective imaging system
Fig. 3 is sampling mechanism of diaphragm
Fig. 4 is object plane and the hot spot pattern of image planes.
Embodiment
The utility model is described in detail below in conjunction with accompanying drawing 1- Fig. 4, to the skill in the utility model embodiment
Art scheme is clearly and completely described, it is clear that and described embodiment is only the utility model part of the embodiment, and
The embodiment being not all of.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creativeness
The every other embodiment obtained under the premise of work, belong to the scope of the utility model protection.
The utility model provides a kind of optical fiber distance measurement system herein by improving, and can be applied to the survey of fiber array
Amount.Fig. 1 shows the structure of the test system；It includes a testing fiber of optical branching device 20, one of coherent source 10, one
The microcobjective 40, one of array 30, one samples 50, image collection chips 60 of diaphragm and an image processing module 70.
Wherein, coherent source 10 is divided into multichannel by optical branching device first, is respectively connected to more tails of testing fiber array 30
In fine 30b, then it is emitted from fiber end face；Fiber end face 30a is placed near the front focal plane of microcobjective 40, and sampling diaphragm 50 is placed in
On the back focal plane of microcobjective 40；Image collection chip 60 is placed in the image planes of microcobjective 40, obtains the light at fiber end face
Spot image, then analyzed by image processing module 70, obtain optical fiber pitch information.
Fig. 2 show microcobjective imaging system structure, and details are as follows：
Fiber end face is object plane, is placed near the front focal plane of microcobjective 40, object distance l1Slightly larger than focal length f, according to lens into
As principle, image distance l2Focal length will be much larger than, obtains high magnification imaging.Sampling diaphragm 50 is placed on the back focal plane of microcobjective, root
It is theoretical according to Fourier optics, it is also the spatial frequency spectrum face of imaging object herein.Image collection chip is placed in the picture of microcobjective 40
On face, the light spot image at fiber end face, imaging multiplying power β=l are obtained2/l1。
Fig. 3 shows sampling mechanism of diaphragm, and it is a slit array, and along the y-axis direction, each slit is along x-axis for slit length
Direction arranges, spacing t1.Compares figure 2, the optical fiber in testing fiber array arrange along the y-axis direction.
Fig. 4 shows object plane and the hot spot pattern of image planes, a) is wherein object plane hot spot pattern, it can be seen that each hot spot is along y
Direction of principal axis deploys, spacing d1.For the micro imaging system of routine, without diaphragm is sampled at back focal plane, one is obtained in image planes
Enlargement ratio be β hot spot pattern, spacing d2=β d1, as shown in b).In the utility model, at the back focal plane of microcobjective
Setting a cycle is t1Sampling diaphragm, therefore obtain the replicating array of hot spot pattern, array deploys along the x-axis direction, spacing
For t2。
The implementation method of optical fiber distance measurement system is illustrated below：
From the single hot spot pattern of every optical fiber output, represented with function c (x, y), wherein (x, y) is object plane coordinate.It is more
The output facula of root optical fiber lines up array along the y-axis direction, the pattern function g (x, y) of spot array, mathematically, can use single light
The convolution of the pattern function of spot and a comb function is stated, such as formula (1).
Wherein comb is comb function symbol,Represent arrangement, a spacing d along the y-axis direction1Comb
Shape function；Symbol " * " represents convolution algorithm.
According to Fourier optics principle, mathematically, the pattern function obtained on the back focal plane of microcobjective
G(x1,y1), be object plane pattern function Fourier transform, such as formula (2).
Wherein (x1,y1) for the coordinate on microcobjective back focal plane, function C is function c Fourier transform, and λ is coherent light
The wavelength in source, f are the focal length of microcobjective, and symbol " " represents product calculation.
Sampling grating is arrangement, a spacing t along the x-axis direction1Slit array, mathematically, its transmitance can use comb
Shape function describes, such as formula (3).
On the back focal plane of microcobjective, after sampled grating, pattern function G ' (x1,y1) such as formula (4).
It is in larger distance from microcobjective back focal plane to image planes, meet Fu Lang and fraunhofer-diffraction condition, according to Fourier optics
Theory, mathematically, image planes pattern function g ' (x ', y ') are the Fourier transforms of back focal plane pattern function, such as formula (5).
Wherein (x ', y ') is image coordinates, and A is constant.
Pattern function shown in formula (5) is understood below：
Wherein, functionRepresent the hot spot pattern that an enlargement ratio is β；FunctionRepresent one
Individual arrangement, spacing along the y-axis direction are β d1Comb function.
Wherein, the convolution of above-mentioned two functionRepresent a spot array, hot spot chi
Very little and hot spot spacing is exaggerated β times.
Wherein, functionRepresenting one, arrangement, spacing are along the x-axis directionComb function, therefore picture
Face pattern function g ' (x ', y ') is represented：The object plane spot array (as shown in fig. 4 a) arranged along the y-axis direction, be exaggerated β times it
Afterwards, then along the x-axis direction pattern matrix is copied into, array pitch isAs illustrated in fig. 4 c.
As described above, existing measurement scheme, because, without sampling diaphragm, be can only obtain at the back focal plane of microcobjective such as Fig. 4 b
The hot spot pattern of one group of shown amplification, the hot spot pattern spacing d in image planes is obtained by graphical analysis2, by being calculated
Object plane optical fiber spacingHowever, the enlargement ratio β of imaging system depends on object distance l1, due to the focusing in imaging process
Situation can not ensure uniformity, it is impossible to obtain l1Exact value, cannot also measure optical fiber spacing d1Exact value.Therefore, generally
By the sample of a standard scale, object plane is placed in simultaneously with testing fiber end face, as the reference yardstick in measurement.
A sampling diaphragm is provided with the technical solution of the utility model, at the back focal plane of microcobjective, thus in picture
Face obtains the replicating array of hot spot pattern, its spacingSlightly convert, obtain the enlargement ratio of imaging systemThe wavelength X of coherent source, the focal length f of microcobjective and the cycle t for sampling diaphragm1It is known systematic parameter, figure
The spacing t of sample replicating array2It can be obtained by graphical analysis, imaging system can be calculated according to this as the reference yardstick in measurement
Enlargement ratio β, and then obtain optical fiber spacing
The requires of the utility model imaging system uses illumination of coherent light source, and various lasers are respectively provided with good coherence,
Available in the test system.From formulaIt can be seen that the key factor for influenceing the measuring precision is sampling diaphragm
Cycle t1Precision, with microelectronic technique make sampling diaphragm, precision easily reach less than 0.1 micron even 10 nanometers measure
Level, meet measurement needs.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or new using this practicality
Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can be realized in other embodiments in the case where not departing from spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The most wide scope consistent with features of novelty.
Claims (6)
- A kind of 1. optical fiber distance measurement system, for being measured to the optical fiber spacing at fiber array end face, it is characterised in that： It includes a coherent source (10), an optical branching device (20), a testing fiber array (30), a microcobjective (40), a sampling diaphragm (50), an image collection chip (60) and an image processing module (70)；Wherein, coherent light Source (10) is connected with optical branching device (20), and optical branching device (20) is connected with testing fiber array (30), and microcobjective (40) is located at After light-metering fibre array (30), sampling diaphragm (50) is located between microcobjective (40) and image collection chip (60), IMAQ Chip (60) is connected with image processing module (70).
- A kind of 2. optical fiber distance measurement system according to claim 1, it is characterised in that：The coherent source (10) passes through light Shunt (20) is divided into multichannel, is respectively connected to the tail optical fiber (30b) of testing fiber array (30).
- A kind of 3. optical fiber distance measurement system according to claim 1, it is characterised in that：The testing fiber array (30) Fiber end face (30a) is placed near the front focal plane of microcobjective (40).
- A kind of 4. optical fiber distance measurement system according to claim 1, it is characterised in that：The sampling diaphragm (50) is placed in aobvious On the back focal plane of speck mirror (40).
- A kind of 5. optical fiber distance measurement system according to claim 1, it is characterised in that：Image collection chip (60) is placed in aobvious In the image planes of speck mirror (40).
- A kind of 6. optical fiber distance measurement system according to claim 1, it is characterised in that：It is a slit to sample diaphragm (50) Array, along the y-axis direction, each slit arranges slit length along the x-axis direction, spacing t1, and the optical fiber in testing fiber array is along y-axis Direction arranges.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840008A (en) * | 2017-04-07 | 2017-06-13 | 上海汇珏网络通信设备有限公司 | A kind of optical fiber distance measurement system and measuring method |
| CN114839730A (en) * | 2022-04-26 | 2022-08-02 | 珠海光库科技股份有限公司 | Emergent mode field measuring device and method of optical chip |
-
2017
- 2017-04-07 CN CN201720360622.4U patent/CN206670570U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840008A (en) * | 2017-04-07 | 2017-06-13 | 上海汇珏网络通信设备有限公司 | A kind of optical fiber distance measurement system and measuring method |
| CN114839730A (en) * | 2022-04-26 | 2022-08-02 | 珠海光库科技股份有限公司 | Emergent mode field measuring device and method of optical chip |
| CN114839730B (en) * | 2022-04-26 | 2023-03-07 | 珠海光库科技股份有限公司 | Emergent mode field measuring device and method of optical chip |
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