CN105890643A - Calibration device for optical path difference test instrument and calibration method - Google Patents
Calibration device for optical path difference test instrument and calibration method Download PDFInfo
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- CN105890643A CN105890643A CN201610323568.6A CN201610323568A CN105890643A CN 105890643 A CN105890643 A CN 105890643A CN 201610323568 A CN201610323568 A CN 201610323568A CN 105890643 A CN105890643 A CN 105890643A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
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Abstract
The invention discloses a calibration device for an optical path difference test instrument and a calibration method adopting the calibration device. The calibration device comprises a coupler, a fiber delay line and a standard fiber; light emitted by a light source enters the coupler through an input pigtail; after being split, the light enters the fiber delay line and the standard fiber; the fiber delay line includes a displacement device; the displacement device comprises a movable slider and a scale; the fixed end of the displacement device is provided with a collimator; the slider is provided with a reflector; a first optical path is reflected to the coupler through the reflector and is outputted to the optical path difference test instrument through an output pigtail; a second optical path is reflected to the coupler through the tail end of the standard fiber and is outputted to the optical path difference test instrument through the output pigtail; and the first optical path and the second optical path have optical path difference. With the calibration device and the calibration method of the invention adopted, the measurement calibration problem of the optical path difference test instrument can be solved. The uncertainty of the calibration device is lower than 0.1 mm, and the measuring demands of the application of the optical path difference test instrument to an interferometric optical fiber sensor and the like can be satisfied.
Description
Technical field
The present invention relates to a kind of calibrating installation and calibration steps, particularly relate to a kind of calibration cartridge for optical path difference tester
Put, and the method using this calibrating installation.
Background technology
In interferometric optical fiber sensor field, need the optical path difference of two optical interference circuits of sensor is controlled accurately
System, to meet the requirement of homogeneity of product and array scale.Interferometric optical fiber sensor is usually Michelson interferometer shape
Formula.Optical path difference tester is the powerful that the optical path difference to two optical interference circuits of Michelson interferometer measures, precision
1mm can be better than.
Existing calibrating installation and calibration steps, it is impossible to meet the such high-precision metering requirements of optical path difference tester；Mesh
Before, optical fibre length measurement method mainly has back-scatteringme thod, impulse method and phase shift method etc., but is respectively present following defect:
(1) back-scatteringme thod mainly has optical time domain reflectometer OTDR and optical frequency domain reflectometer OFDR, and wherein OTDR precision is not
High；OFDR requires height to light source, detection and processing equipment, and structure is complicated；
(2) precision of impulse method and phase shift method is processed by detector and data and is restricted, to equipment such as optical-fiber network analysers
Requiring height, cost is big；
Therefore, the highest for precision in prior art and the measurement and calibration of optical path difference tester cannot be directly applied to
Not enough, it is necessary to a kind of calibrating installation for optical path difference tester and calibration steps are provided.
Summary of the invention
Present invention aim to address the problems of the prior art, it is provided that a kind of simple in construction, be easy to calibration and calculate light
The calibrating installation of path difference.
On the other hand, the invention provides the using method of above-mentioned calibrating installation, the method calibration is accurate, quick, just
In calibration optical path difference tester.
The technical scheme is that a kind of optical path difference tester calibration device, including bonder (1), fibre delay line
(2) and standard fiber (3), described bonder be provided with input tail optical fiber (10), output tail optical fiber (11), first connect tail optical fiber (12) and
Second connects tail optical fiber (13), it is characterised in that: described first connects tail optical fiber (12) is connected with described fibre delay line (2), institute
Stating the second connection tail optical fiber (13) to be connected with described standard fiber (3), the light that light source sends is entered coupling by inputting tail optical fiber (10)
Device, forms the first light path after light splitting and the second light path respectively enters fibre delay line (2) and standard fiber (3), optical fiber delay
Line (2) includes that a gearshift (21), institute's displacement apparatus (21) include movable sliding block (210) and scale (211), described
It is provided with collimator (22) on the fixing end of gearshift (21), described slide block (210) is provided with reflecting mirror (23), reflecting mirror
(23) be directed at collimator (22), the first light path by reflecting mirror (23) reflex to bonder (1) and by output tail optical fiber (11) defeated
Going out to optical path difference tester, the second light path is by the reflective surface of standard fiber (3) end to bonder (1) and by output tail
Fine (11) export to optical path difference tester, there is optical path difference between the first light path and the second light path.
Further, institute's displacement apparatus (21) also includes the driving drum (212) driving slide block (210) movement.
Further, described first connects tail optical fiber (12) by welding or the joints of optical fibre and described fibre delay line (2)
Input optical fibre (20) one end be connected, the other end of described input optical fibre (20) is connected with described collimator (22).
Further, described second connection tail optical fiber (13) is connected with described standard fiber (3) by the joints of optical fibre.
Further, the end reflection face of described standard fiber (3) by grinding and polishing or plates reflectance coating formation.
A kind of method using optical path difference tester calibration device to carry out calibrating, it is characterised in that: the method includes as follows
Step:
Step 1: select standard fiber
The measuring basis optical path difference of optical path difference tester to be calibrated is C0, measurement scope is ± Δ0, therefore, select to use mark
The a length of L of quasi-fiber0=C0/ (2n), wherein, n is fiber core refractive index；
Step 2: calculate optical path difference nominal value
Connecting second and access selected standard fiber on tail optical fiber, light is by forming the first light path and second after bonder light splitting
Light path respectively enters fibre delay line and standard fiber, the first light path and the second light path after reflection by output tail optical fiber output, the
Between one light path and the second light path, the nominal value of optical path difference is CS=2n × L0-2n1×L1,
Wherein, n is the fiber core refractive index of optical fiber；n1Refractive index for air；L0Length for standard fiber；L1For optical fiber
The rod reading of delay line, fibre delay line regulation to L during 0 scale1=0；
Step 3: measurement and calibration
Optical path difference tester calibration device accesses optical path difference tester to be calibrated, and input tail optical fiber is connected to optical path difference tester
Light delivery outlet, output tail optical fiber is connected to the optical input of optical path difference tester, reads light path from optical path difference tester to be calibrated
The test value C of difference1, calculate test value C1With step 2 gained nominal value CSDeviation, if gained deviation meets user's request or symbol
Close corresponding measurement and calibration specification, be then qualified instrument；If not meeting, then it it is defective instrument.
Further, described method also comprises the steps:
Step 4: regulation fibre delay line, calculates optical path difference variable quantity nominal value
Regulation fibre delay line makes rod reading variable quantity be Δ L, and the nominal value of optical path difference variable quantity is Δ Cs=2n1Δ
L,
Wherein, n1For the refractive index of air, Δ L is the variable quantity of fibre delay line；
Step 5: measurement and calibration
Optical path difference measurement value C is read from optical path difference tester to be calibrated2, calculate optical path difference variation delta C=| C2-C1|,
Calculate the measured value Δ C and nominal value Δ C of the optical path difference variable quantity of optical path difference tester to be calibratedsDeviation, if gained deviation
Meet user's request or meet corresponding measurement and calibration specification, being then qualified instrument；If not meeting, then it it is defective instrument.
Further, after described step 1, regulate fibre delay line so that it is rod reading is L1=Δ0/ 2 and L1=-
Δ0/ 2, repetition step 2 and step 3 are treated the bound of calibration instrument measurement scope respectively and are calibrated.
There is advantages that
(1) present invention uses fiber coupler standard fiber and fibre delay line to be connected, and constitutes and has known light path
The light channel structure of difference；
(2) present invention can carry out measurement and calibration to optical path difference, it is also possible to carries out optical path difference relative changing value measuring school
Accurate；
(3) present invention is by comparing measured value with scale label, it is achieved that magnitude tracing；
(4) present invention solves the measurement and calibration problem of optical path difference tester, the measurement of optical path difference tester calibration device
Uncertainty is better than 0.1mm, meets optical path difference tester in interferometric optical fiber sensor and phased-array radar etc. are applied
Metering requirements；
(5) present invention quickly, intuitively to optical path difference can carry out measurement and calibration, and cost is relatively low, has stronger through engineering approaches
Practicality.
Accompanying drawing explanation
Fig. 1 is the structural representation of one embodiment of the present invention；
Fig. 2 is the structural representation of fibre delay line in one embodiment of the present invention.
In figure:
1: bonder 2: fibre delay line 3: standard fiber
10: input tail optical fiber 11: output tail optical fiber 12: the first connects tail optical fiber
13: the second connection tail optical fibers 20: input optical fibre 21: gearshift
210: slide block 211: scale 212: drive drum
22: collimator 23: reflecting mirror
Detailed description of the invention
In order to the technological means making the present invention realize, technical characteristic, goal of the invention are easy to understand with technique effect, under
Face combines and is specifically illustrating, and the present invention is expanded on further.
Fig. 1 is the structural representation of one embodiment of the present invention；
Fig. 2 is the structural representation of fibre delay line in one embodiment of the present invention.
A kind of optical path difference tester calibration device as shown in Figure 1 and Figure 2, including bonder 1, fibre delay line 2 and standard
Optical fiber 3, bonder is provided with input tail optical fiber 10, output tail optical fiber 11, first connects tail optical fiber 12 and second and connects tail optical fiber 13, and second even
Connecing tail optical fiber 13 to be connected with standard fiber by the joints of optical fibre, standard fiber end is ground the side such as polishing, plating reflectance coating
Method improves reflectance, and first connects tail optical fiber 12 is connected with fibre delay line, specifically, refers to Fig. 2, fibre delay line bag
Including a gearshift 21 and input optical fibre 20, first connects tail optical fiber 12 by welding or the joints of optical fibre and fibre delay line 2
Input optical fibre 20 one end is connected, and gearshift 21 includes slide block 210, for driving drum 212 and driving slide block 210 to move
Scale 211, the fixing end of gearshift 21 is provided with collimator 22, and slide block 210 is provided with reflecting mirror 23, collimator 22 with
Reflecting mirror 23 is mutually aligned, it is ensured that light has higher coupling efficiency between collimator and reflecting mirror.
The light that light source sends is entered bonder 1 by by input tail optical fiber 10, forms the first light path and the second light path after light splitting
Respectively enteing fibre delay line 2 and standard fiber 3, the first light path reflexes to bonder 1 and by output tail optical fiber by reflecting mirror 23
11 outputs are to optical path difference tester, and the second light path reflexes to bonder 1 and exported to optical path difference tester by output tail optical fiber 11.By
Different in the fiber lengths of two-way light process, there is optical path difference between the first light path and the second light path, by changing optical fiber delay
The length of line, it is possible to change optical path difference, thus realize optical path difference tester is carried out measurement and calibration.
A kind of method utilizing above-mentioned calibrating installation to calibrate optical path difference tester, specifically includes following steps:
Step 1: select standard fiber
Measurement scope according to optical path difference tester to be calibrated selects the standard fiber being of convenient length, it is ensured that light path to be calibrated
Difference tester is measured scope and is included in optical path difference tester calibration device in the range of accommodation of variable delay line.
In this preferred embodiment, the measuring basis optical path difference of optical path difference tester to be calibrated is C0=187.3296m, measures
Range delta0It is ± 50mm, the range of accommodation Δ of fibre delay line1, be ± 50mm, then a length of L of standard fiber0=C0/
(2n), wherein, n=1.4681 is fiber core refractive index, substitutes into length L calculating gained standard fiber0=63.8m, this mark
The length of quasi-fiber is through measurement and calibration；
Step 2: calculate optical path difference nominal value, measurement criteria
Connecting second and access selected standard fiber on tail optical fiber, light is by forming the first light path and second after bonder light splitting
Light path respectively enters fibre delay line and standard fiber, the first light path and the second light path after reflection by output tail optical fiber output, the
Between one light path and the second light path, the nominal value of optical path difference is CS=2n × L0-2n1×L1,
Wherein, n is the fiber core refractive index of optical fiber, and in the present embodiment, n takes 1.4681；
n1For the refractive index of air, in the present embodiment, n1Take 1；
L0For the length of standard fiber, in the present embodiment, L0Take 63.8m；
L1For the rod reading of fibre delay line, in the present embodiment, L1Range of accommodation Δ1Take ± 50mm.
In this preferred embodiment, work as L1When=0, nominal value is CS=2nL0-2n1×L1=2*1.4681*63.8-0=
187.3296m, accesses optical path difference tester to be calibrated then by optical path difference tester calibration device, and input tail optical fiber is connected to optical path difference
The light delivery outlet of tester, output tail optical fiber is connected to the optical input of optical path difference tester, reads from optical path difference tester to be calibrated
The measured value C of optical path difference1, now measured value C1=187.3292m.The measured value C of instrument to be calibrated1With nominal value CSDeviation
User's request should be met or by corresponding measurement and calibration regulation enforcement.This example large deviations is 0.4mm, meets user's request.
Regulation fibre delay line so that it is rod reading is L1=Δ0/ 2 and L1=-Δ0/ 2, treat calibration instrument respectively and survey
The bound of weight range is calibrated.
Regulation fibre delay line so that it is rod reading is L1=25mm, optical path difference nominal value CS=2n × L0-2n1×L1=
2*1.4681*63.8-2*1*0.025=187.27956m；The measured value C of optical path difference is read from optical path difference tester to be calibrated,
Now measured value C=187.2797m, deviation is 0.14mm, and apparatus measures range lower limit to be calibrated meets user's request；
Regulation fibre delay line so that it is rod reading is L1=-25mm optical path difference nominal value CS=2n × L0-2n1×L1=
(2*1.4681*63.8-2*1*-0.025)=187.37956m；The measured value of optical path difference is read from optical path difference tester to be calibrated
C1, now measured value C=187.3794m, deviation is 0.16mm, and apparatus measures range limit to be calibrated meets user's request；
Step 3: regulation fibre delay line, calculates optical path difference variable quantity nominal value, measurement and calibration
First read optical path difference measurement value C of instrument to be calibrated1, C1=187.3292m, then regulates fibre delay line, makes mark
Chi reading is Δ L, and its numerical value is generally selected the measurement range of optical path difference tester to be calibrated, in the present embodiment optical path difference test
The range of instrument is ± 50mm, therefore Δ L=50/2mm=25mm, and the nominal value of optical path difference variable quantity is Δ Cs=2n1Δ L (formula
In: n1For the refractive index of air, n1=1), now the nominal value of optical path difference variable quantity is Δ Cs=50mm.
Now read optical path difference measurement value C of instrument to be calibrated2, C2=187.2797m, the measured value of optical path difference variable quantity
Δ C=| C2-C1|=| 187.2797-187.3292 |=0.0495m=49.5mm.The optical path difference variable quantity of instrument to be calibrated
Measured value Δ C and nominal value Δ CsDeviation should meet user's request or by corresponding measurement and calibration regulation enforcement.In this example partially
Difference is 0.5mm, meets user's request.Therefore, optical path difference tester to be calibrated is qualified through measurement and calibration.
It is only preferred embodiment of the present invention in sum, is not used for limiting the practical range of the present invention.I.e. Fan Yiben
The equivalence that the content of patent application the scope of the claims is made changes and modifies, and all should belong to the technology category of the present invention.
Claims (8)
1. an optical path difference tester calibration device, including bonder (1), fibre delay line (2) and standard fiber (3), described
Bonder is provided with input tail optical fiber (10), output tail optical fiber (11), the first connection tail optical fiber (12) and the second connection tail optical fiber (13), and it is special
Levy and be: described first connects tail optical fiber (12) is connected with described fibre delay line (2), and described second connects tail optical fiber (13) and institute
Stating standard fiber (3) to be connected, the light that light source sends is entered bonder by inputting tail optical fiber (10), forms the first light path after light splitting
Respectively enteing fibre delay line (2) and standard fiber (3) with the second light path, fibre delay line (2) includes a gearshift (21),
Institute's displacement apparatus (21) includes movable sliding block (210) and scale (211), and the fixing end of institute's displacement apparatus (21) sets
Being equipped with collimator (22), described slide block (210) is provided with reflecting mirror (23), reflecting mirror (23) is directed at collimator (22), the
One light path reflexes to bonder (1) by reflecting mirror (23) and is exported to optical path difference tester, the second light by output tail optical fiber (11)
Road is tested by the reflective surface of standard fiber (3) end to bonder (1) and by output tail optical fiber (11) output to optical path difference
, between the first light path and the second light path, there is optical path difference in instrument.
Optical path difference tester calibration device the most according to claim 1, it is characterised in that: institute's displacement apparatus (21) also wraps
Include the driving drum (212) driving slide block (210) movement.
Optical path difference tester calibration device the most according to claim 2, it is characterised in that: described first connects tail optical fiber (12)
It is connected with input optical fibre (20) one end of described fibre delay line (2) by welding or the joints of optical fibre, described input optical fibre
(20) the other end is connected with described collimator (22).
Optical path difference tester calibration device the most according to claim 2, it is characterised in that: described second connects tail optical fiber (13)
It is connected with described standard fiber (3) by the joints of optical fibre.
Optical path difference tester calibration device the most according to claim 4, it is characterised in that: the end of described standard fiber (3)
End reflecting surface is by grinding and polishing or plates reflectance coating formation.
6. one kind uses the method that optical path difference tester calibration device carries out calibrating, it is characterised in that: the method includes walking as follows
Rapid:
Step 1: select standard fiber
The measuring basis optical path difference of optical path difference tester to be calibrated is C0, measurement scope is ± Δ0, therefore, select use standard light
Fine a length of L0=C0/ (2n), wherein, n is fiber core refractive index；
Step 2: calculate optical path difference nominal value
Connecting second and access selected standard fiber on tail optical fiber, light is by forming the first light path and the second light path after bonder light splitting
Respectively enter fibre delay line and standard fiber, the first light path and the second light path after reflection by output tail optical fiber output, the first light
Between road and the second light path, the nominal value of optical path difference is CS=2n × L0-2n1×L1,
Wherein, n is the fiber core refractive index of optical fiber；n1Refractive index for air；L0Length for standard fiber；L1For optical fiber delay
The rod reading of line, fibre delay line regulation to L during 0 scale1=0；
Step 3: measurement and calibration
Optical path difference tester calibration device accesses optical path difference tester to be calibrated, and input tail optical fiber is connected to the light of optical path difference tester
Delivery outlet, output tail optical fiber is connected to the optical input of optical path difference tester, reads optical path difference from optical path difference tester to be calibrated
Test value C1, calculate test value C1With step 2 gained nominal value CSDeviation, if gained deviation meets user's request or meets phase
The measurement and calibration specification answered, then be qualified instrument；If not meeting, then it it is defective instrument.
A kind of method using optical path difference tester calibration device to carry out calibrating the most as claimed in claim 6, it is characterised in that:
Described method also comprises the steps:
Step 4: regulation fibre delay line, calculates optical path difference variable quantity nominal value
Regulation fibre delay line makes rod reading variable quantity be Δ L, and the nominal value of optical path difference variable quantity is Δ Cs=2n1Δ L,
Wherein, n1For the refractive index of air, Δ L is the variable quantity of fibre delay line；
Step 5: measurement and calibration
Optical path difference measurement value C is read from optical path difference tester to be calibrated2, calculate optical path difference variation delta C=| C2-C1|, calculate
The measured value Δ C and nominal value Δ C of the optical path difference variable quantity of optical path difference tester to be calibratedsDeviation, if gained deviation meet
User's request or meet corresponding measurement and calibration specification, then be qualified instrument；If not meeting, then it it is defective instrument.
A kind of method using optical path difference tester calibration device to carry out calibrating the most as claimed in claim 7, it is characterised in that:
After described step 1, regulate fibre delay line so that it is rod reading is L1=Δ0/ 2 and L1=-Δ0/ 2, repeat step 2 and step
Rapid 3 bounds treating calibration instrument measurement scope respectively are calibrated.
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| Publication number | Publication date |
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| CN105890643B (en) | 2018-03-06 |
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