CN105890643B - A kind of calibrating installation and calibration method for optical path difference tester - Google Patents
A kind of calibrating installation and calibration method for optical path difference tester Download PDFInfo
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- CN105890643B CN105890643B CN201610323568.6A CN201610323568A CN105890643B CN 105890643 B CN105890643 B CN 105890643B CN 201610323568 A CN201610323568 A CN 201610323568A CN 105890643 B CN105890643 B CN 105890643B
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- path difference
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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
Abstract
The invention discloses a kind of optical path difference tester calibration device and the method calibrated using the device, the device includes coupler, fibre delay line and standard fiber, the light that light source is sent enters coupler by input tail optical fiber, fibre delay line and standard fiber are respectively enterd after light splitting, fibre delay line includes a gearshift, gearshift includes movable sliding block and scale, collimater is provided with the fixing end of gearshift, speculum is provided with sliding block, first light path reflexes to coupler by speculum and exported by output tail optical fiber to optical path difference tester, second light path is exported to optical path difference tester by the reflective surface of standard fiber end to coupler and by output tail optical fiber, optical path difference be present between first light path and the second light path.The present invention solves the problems, such as the measurement and calibration of optical path difference tester, and the uncertainty of measurement of calibrating installation is better than 0.1mm, meets metering requirements of the optical path difference tester in the application such as interferometric optical fiber sensor.
Description
Technical field
The present invention relates to a kind of calibrating installation and calibration method, more particularly to a kind of calibration cartridge for optical path difference tester
Put, and the method using the calibrating installation.
Background technology
, it is necessary to accurately be controlled to the optical path difference of two optical interference circuits of sensor in interferometric optical fiber sensor field
System, to meet the requirement of homogeneity of product and array scale.Interferometric optical fiber sensor is usually Michelson interferometer shapes
Formula.Optical path difference tester is the powerful measured to the optical path difference of two optical interference circuits of Michelson interferometers, precision
1mm can be better than.
Existing calibrating installation and calibration method, the so high-precision metering requirements of optical path difference tester can not be met；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, wherein OTDR precision not
It is high；OFDR requires high to light source, detection and processing equipment, complicated；
(2) impulse method and the precision of phase shift method are restricted by detector and data processing, to equipment such as optical-fiber network analyzers
It is required that high, cost is big；
Therefore, it is not high for precision in the prior art and the measurement and calibration of optical path difference tester can not be directly applied to
Deficiency, it is necessary to which a kind of calibrating installation and calibration method for optical path difference tester is provided.
The content of the invention
Present invention aim to address the problems of the prior art, there is provided one kind is simple in construction, is easy to calibrate and calculate light
The calibrating installation of path difference.
On the other hand, the invention provides the application method of above-mentioned calibrating installation, this 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 coupler 1, the and of fibre delay line 2
Standard fiber 3, the coupler 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, it is characterised in that：It is described first connection tail optical fiber 12 is connected with the fibre delay line 2, it is described second connection tail optical fiber 13 and
The standard fiber 3 is connected, and the light that light source is sent enters coupler by input tail optical fiber 10, formed after light splitting the first light path and
Second light path respectively enters fibre delay line 2 and standard fiber 3, and fibre delay line 2 includes a gearshift 21, the displacement dress
Putting 21 includes movable sliding block and scale 211, and collimater 22, the sliding block are provided with the fixing end of institute's displacement apparatus 21
On be provided with speculum 23, speculum 23 is aligned with collimater 22, the first light path by speculum 23 reflex to coupler 1 and by
Output tail optical fiber 11 is exported to optical path difference tester, the second light path by the reflective surface of the end of standard fiber 3 to coupler 1 simultaneously
Exported by output tail optical fiber 11 to optical path difference tester, optical path difference be present between the first light path and the second light path.
Further, institute's displacement apparatus 21 also includes the driving drum 212 of driving sliding block movement.
Further, the first connection tail optical fiber 12 passes through the defeated of welding or the joints of optical fibre and the fibre delay line 2
Enter optical fiber one end to be connected, the other end of the input optical fibre is connected with the collimater 22.
Further, the second connection tail optical fiber 13 is connected by the joints of optical fibre with the standard fiber 3.
Further, the end reflection face of the standard fiber 3 by grinding and polishing or plates reflectance coating and formed.
A kind of method calibrated using optical path difference tester calibration device, it is characterised in that：This method includes as follows
Step：
Step 1：Selection standard optical fiber
The measuring basis optical path difference of optical path difference tester to be calibrated is C0, measurement range is ± Δ0, therefore, selection uses mark
The length of quasi-fiber is L0=C0/ (2n), wherein, n is fiber core refractive index；
Step 2：Calculate optical path difference nominal value
Selected standard fiber is accessed on the second connection tail optical fiber, light forms the first light path and second after being divided by coupler
Light path respectively enters fibre delay line and standard fiber, and the first light path and the second light path are exported by output tail optical fiber after reflection, the
The nominal value of optical path difference is C between one light path and the second light pathS=2n × L0-2n1×L1,
Wherein, n is the fiber core refractive index of optical fiber；n1For the refractive index of air；L0For the length of standard fiber；L1For optical fiber
The rod reading of delay line, fibre delay line are adjusted to L during 0 scale1=0；
Step 3：Measurement and calibration
Optical path difference tester calibration device is accessed into optical path difference tester to be calibrated, input tail optical fiber is connected to optical path difference tester
Light output mouth, output tail optical fiber is connected to the optical input of optical path difference tester, light path read 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
Corresponding measurement and calibration specification is closed, then is qualified instrument；If not meeting, for unqualified instrument.
Further, methods described also comprises the following steps：
Step 4：Fibre delay line is adjusted, 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, be then qualified instrument；If not meeting, for unqualified instrument.
Further, after the step 1, fibre delay line is adjusted, it is L to make its rod reading1=Δ0/ 2 and L1=-
Δ0/ 2, the bound that repeat step 2 and step 3 treat calibration instrument measurement range respectively is calibrated.
The present invention has the advantages that：
(1) present invention is connected standard fiber with fibre delay line using fiber coupler, is constituted with known light path
The light channel structure of difference；
(2) present invention can carry out measurement and calibration to optical path difference, can also carry out metering school to optical path difference relative changing value
It is accurate；
(3) present invention realizes magnitude tracing by the way that measured value is compared with scale label；
(4) present invention solves the problems, such as the measurement and calibration 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 the application such as interferometric optical fiber sensor and phased-array radar
Metering requirements；
(5) present invention quickly, intuitively can carry out measurement and calibration to optical path difference, and cost is relatively low, has stronger engineering
Practicality.
Brief description of the drawings
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：Coupler 2：Fibre delay line 3：Standard fiber
10：Input tail optical fiber 11：Export tail optical fiber 12：First connection tail optical fiber
13：Second connection tail optical fiber 21：Gearshift
211：Scale 212：Drive drum
22：Collimater 23：Speculum
Embodiment
In order that technological means, technical characteristic, goal of the invention and technique effect that the present invention realizes are easy to understand, 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 coupler 1, fibre delay line 2 and standard
Optical fiber 3, coupler 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 connects
Connect tail optical fiber 13 by the joints of optical fibre with standard fiber to be connected, standard fiber end is ground the sides such as polishing, plating reflectance coating
Method improves reflectivity, and the first connection tail optical fiber 12 is connected with fibre delay line, specifically, refers to Fig. 2, fibre delay line bag
Include a gearshift 21 and input optical fibre, the first connection tail optical fiber 12 is defeated by welding or the joints of optical fibre and fibre delay line 2
Enter optical fiber one end to be connected, gearshift 21 includes sliding block, driving drum 212 and scale 211 for driving sliding block to move, position
Collimater 22 is provided with the fixing end of moving device 21, speculum 23 is provided with sliding block, collimater 22 and speculum 23 are mutual
Alignment, ensure that light has higher coupling efficiency between collimater and speculum.
The light that light source is sent forms the first light path and the second light path by entering coupler 1 by input tail optical fiber 10 after light splitting
Fibre delay line 2 and standard fiber 3 are respectively enterd, the first light path reflexes to coupler 1 and by output tail optical fiber by speculum 23
To optical path difference tester, the second light path reflexes to coupler 1 and exported by output tail optical fiber 11 to optical path difference tester for 11 outputs.By
It is different in the fiber lengths that two-way light passes through, optical path difference be present 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, measurement and calibration is carried out to optical path difference tester so as to realize.
A kind of method calibrated using above-mentioned calibrating installation to optical path difference tester, is specifically comprised the following steps：
Step 1：Selection standard optical fiber
The standard fiber being of convenient length according to the selection of the measurement range of optical path difference tester to be calibrated, ensures light path to be calibrated
Poor tester measurement range is included in optical path difference tester calibration device in the adjustable range 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, measurement
Range delta0It is ± 50mm, the adjustable range Δ of fibre delay line1, it is ± 50mm, then the length of standard fiber is L0=C0/
(2n), wherein, n=1.4681 is fiber core refractive index, substitutes into the length L for calculating gained standard fiber0=63.8m, the mark
The length of quasi-fiber passes through measurement and calibration；
Step 2：Calculate optical path difference nominal value, measurement criteria
Selected standard fiber is accessed on the second connection tail optical fiber, light forms the first light path and second after being divided by coupler
Light path respectively enters fibre delay line and standard fiber, and the first light path and the second light path are exported by output tail optical fiber after reflection, the
The nominal value of optical path difference is C between one light path and the second light pathS=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, L1Adjustable range Δ1Take ± 50mm.
In this preferred embodiment, work as L1When=0, nominal value CS=2nL0-2n1×L1=2*1.4681*63.8-0=
187.3296m, then accesses optical path difference tester to be calibrated by optical path difference tester calibration device, and input tail optical fiber is connected to optical path difference
The light output mouth of tester, output tail optical fiber are connected to the optical input of optical path difference tester, read 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 are 0.4mm, meet user's request.
Fibre delay line is adjusted, it is L to make its rod reading1=Δ0/ 2 and L1=-Δ0/ 2, calibration instrument survey is treated respectively
The bound of amount scope is calibrated.
Fibre delay line is adjusted, it is L to make its rod reading1=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 0.14mm, apparatus measures range lower limit to be calibrated meet user's request；
Fibre delay line is adjusted, it is L to make its rod reading1=-25mm optical path difference nominal values 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 0.16mm, apparatus measures range limit to be calibrated meet user's request；
Step 3：Fibre delay line is adjusted, calculates optical path difference variable quantity nominal value, measurement and calibration
First read the optical path difference measurement value C of instrument to be calibrated1, C1=187.3292m, then adjusts fibre delay line, makes mark
Chi reading is Δ L, and its numerical value generally selects the measuring range of optical path difference tester to be calibrated, and optical path difference is tested in the present embodiment
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 (formulas
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 the 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 embodiments of the present invention in summary, is not used for limiting the practical range of the present invention.That is Fan Yiben
The equivalence changes and modification that the content of patent application the scope of the claims is made, it should all belong to the technology category of the present invention.
Claims (8)
1. a kind of optical path difference tester calibration device, including coupler (1), fibre delay line (2) and standard fiber (3), described
Coupler 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
Sign is：The first connection tail optical fiber (12) is connected with the fibre delay line (2), the second connection tail optical fiber (13) and institute
State standard fiber (3) to be connected, the light that light source is sent enters coupler by input tail optical fiber (10), forms the first light path after light splitting
Fibre delay line (2) and standard fiber (3) are respectively enterd with the second light path, fibre delay line (2) includes a gearshift (21),
Institute's displacement apparatus (21) includes movable sliding block and scale (211), is provided with the fixing end of institute's displacement apparatus (21)
Collimater (22), speculum (23) is provided with the sliding block, speculum (23) is aligned with collimater (22), and the first light path passes through
Speculum (23) reflexes to coupler (1) and passes through standard by output tail optical fiber (11) output to optical path difference tester, the second light path
The reflective surface of optical fiber (3) end is to coupler (1) and by output tail optical fiber (11) output to optical path difference tester, the first light path
Optical path difference be present between the second light path.
2. optical path difference tester calibration device according to claim 1, it is characterised in that：Institute's displacement apparatus (21) also wraps
Include the driving drum (212) of driving sliding block movement.
3. optical path difference tester calibration device according to claim 2, it is characterised in that：The first connection tail optical fiber (12)
By welding or the joints of optical fibre be connected with input optical fibre one end of the fibre delay line (2), the input optical fibre it is another
One end is connected with the collimater (22).
4. optical path difference tester calibration device according to claim 2, it is characterised in that：The second connection tail optical fiber (13)
It is connected by the joints of optical fibre with the standard fiber (3).
5. optical path difference tester calibration device according to claim 4, it is characterised in that：The end of the standard fiber (3)
End reflecting surface is by grinding and polishing or plates reflectance coating and is formed.
6. the method that the optical path difference tester calibration device described in a kind of usage right requirement 1 is calibrated, it is characterised in that：Should
Method comprises the following steps：
Step 1：Selection standard optical fiber
The measuring basis optical path difference of optical path difference tester to be calibrated is C0, measurement range is ± Δ0, therefore, selection uses standard light
Fine length is L0=C0/ (2n), wherein, n is fiber core refractive index；
Step 2：Calculate optical path difference nominal value
Selected standard fiber is accessed on the second connection tail optical fiber, light forms the first light path and the second light path after being divided by coupler
Fibre delay line and standard fiber are respectively enterd, the first light path and the second light path are exported by output tail optical fiber after reflection, the first light
The nominal value of optical path difference is C between road and the second light pathS=2n × L0-2n1×L1,
Wherein, n is the fiber core refractive index of optical fiber；n1For the refractive index of air；L0For the length of standard fiber；L1For optical fiber delay
The rod reading of line, fibre delay line are adjusted to L during 0 scale1=0；
Step 3：Measurement and calibration
Optical path difference tester calibration device is accessed into optical path difference tester to be calibrated, input tail optical fiber is connected to the light of optical path difference tester
Delivery outlet, output tail optical fiber are connected to the optical input of optical path difference tester, optical path difference are read 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 it is qualified instrument；If not meeting, for unqualified instrument.
A kind of 7. method calibrated using optical path difference tester calibration device as claimed in claim 6, it is characterised in that：
Methods described also comprises the following steps：
Step 4：Fibre delay line is adjusted, 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 meets corresponding measurement and calibration specification, then is qualified instrument；If not meeting, for unqualified instrument.
A kind of 8. method calibrated using optical path difference tester calibration device as claimed in claim 7, it is characterised in that：
After the step 1, fibre delay line is adjusted, it is L to make its rod reading1=Δ0/ 2 and L1=-Δ0/ 2, repeat step 2 and step
Rapid 3 bounds for treating calibration instrument measurement range respectively are calibrated.
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| CN107271146B (en) * | 2017-06-02 | 2022-02-01 | 广州广电计量检测股份有限公司 | Calibration device and equipment of optical fiber dispersion tester |
| CN111947579A (en) * | 2020-06-30 | 2020-11-17 | 昂纳信息技术（深圳）有限公司 | Optical fiber length measuring method |
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