CN109974975A - Device for pulse optical fiber index test - Google Patents
Device for pulse optical fiber index test Download PDFInfo
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- CN109974975A CN109974975A CN201910261712.1A CN201910261712A CN109974975A CN 109974975 A CN109974975 A CN 109974975A CN 201910261712 A CN201910261712 A CN 201910261712A CN 109974975 A CN109974975 A CN 109974975A
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- optical fiber
- laser
- stepper motor
- pulse optical
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The present embodiments relate to laser performance the field of test technology, the device for pulse optical fiber index test provided, it include: power meter, optoisolator sleeve, one-dimensional translation stage and two-dimentional cross slid platform, optoisolator sleeve is for placing pulse optical fiber, power meter and optoisolator sleeve are coaxially arranged, the laser issued for acquisition pulse optical fiber laser, it is provided with first diaphragm in multiple and different apertures in one-dimensional translation stage, second diaphragm in multiple and different apertures is provided on two-dimentional cross slid platform；One-dimensional translation stage is moved for inclined direction, so that multiple first diaphragms move on the propagation ducts of laser；Two-dimension translational platform is moved for horizontal direction and vertical direction, so that multiple second diaphragms move on the propagation ducts of laser.The device for being used for pulse optical fiber index test is easy to operate, has more professional knowledge without operator, avoids artificial error in reading, also avoids influence of the artificial uncertain factor to test.
Description
Technical field
The present embodiments relate to laser performance the field of test technology, more particularly to one kind to be used for pulse optical fiber
The device of index test.
Background technique
Laser is divided into continuous wave laser and pulse laser from operation.Pulse laser refers to single laser pulse width
Degree less than 0.25 second, just work primary laser at interval of certain time, it is suitable for laser and beats with larger output power
Mark, cutting, ranging etc..
Pulse optical fiber mainly includes the indexs such as beam diameter, center transmitance, output power, at present these indexs
Test be limited to human factor and test technology difficulty, there are some discretenesses, poor repeatability and inaccurate for test result
Situations such as true, causes to be easy to break down in client production, and then influences customer satisfaction.
Summary of the invention
The embodiment of the present invention provides a kind of dress for pulse optical fiber index test suitable for producing and examining
It sets, the problems such as there are some discretenesses, poor repeatability and inaccuracy to the test result that solves conventional apparatus.
The embodiment of the present invention provides a kind of device for pulse optical fiber index test, comprising: power meter, light every
From device sleeve, one-dimensional translation stage and two-dimentional cross slid platform, the optoisolator sleeve is for placing pulse optical fiber, institute
It states power meter and the optoisolator sleeve is coaxially arranged, the laser issued for acquiring the pulse optical fiber is described
It is provided with first diaphragm in multiple and different apertures in one-dimensional translation stage, is provided with multiple and different apertures on the two dimension cross slid platform
The second diaphragm；
The one-dimensional translation stage is moved for inclined direction, so that multiple first diaphragms are logical in the propagation of the laser
It is moved on road；The two-dimension translational platform is moved for horizontal direction and vertical direction, so that multiple second diaphragms are described
It is moved on the propagation ducts of laser.
It wherein, further include bottom plate and the side plate for enclosing the surrounding set on the bottom plate, the power meter, the optoisolator set
Cylinder, the one-dimensional translation stage and the two-dimentional cross slid platform are mounted on the bottom plate, and the side plate is used to swash described
Light is isolated from the outside.
Wherein, the one-dimensional translation stage includes translation stage, the first stepper motor and the first lead screw；
First lead screw is installed on the first lead screw support base, and one end of first lead screw is connected to the first step
Into motor, the first lead screw support base is installed on the bottom plate；The translation stage is installed on first lead screw, and described
Multiple first diaphragms are provided on translation stage.
Wherein, the axis of the axis and the bottom plate of the first lead screw support base is at an acute angle.
It wherein, further include the first stepper motor driver of installation on the side plate, the first stepping motor driven
Device is connect with first stepper motor.
Wherein, the two-dimentional cross slid platform include slide unit, second stepper motor, third stepper motor, the second lead screw and
Third lead screw；
Second lead screw is installed on the second lead screw support base, and one end of second lead screw is connected to the second step
Into motor, the second lead screw support base is installed on the bottom plate；The third lead screw is installed on third lead screw support base, and
One end of the third lead screw is connected to the third stepper motor, and the third lead screw support base is installed on second lead screw
On, second lead screw and the third lead screw support base are arranged vertically, and the slide unit is installed on the third lead screw, and described
Multiple second diaphragms are provided on slide unit.
Wherein, the aperture of second diaphragm is 2~10mm.
It wherein, further include the second stepper motor driver and third stepper motor driver of installation on the side plate,
The second stepper motor driver is connect with the second stepper motor, the third stepper motor driver and the third
Stepper motor connection.
It wherein, further include magnet briquetting, the output optoisolator of the pulse optical fiber passes through the magnet briquetting
It is fixed on the optoisolator sleeve.
It wherein, further include data processing module, the data processing module is for obtaining any first diaphragm and appointing
One second diaphragm the first firm power value of the laser, the laser portion not when on the propagation ducts of the laser
The second firm power value of the laser and the laser when passing through one of first diaphragm is divided to pass completely through wherein
The third firm power value of laser when one second diaphragm, and it is based on the first firm power value, described second
Firm power value and the third firm power value, obtain beam diameter, center transmitance and optical power.
Device provided in an embodiment of the present invention for pulse optical fiber index test, acquisition is any to state the first diaphragm
Not when on the propagation ducts of laser, the first firm power value of laser, laser part pass through one with any second diaphragm
The third of laser when the second firm power value of laser and laser pass completely through one of them second diaphragm when a first diaphragm
Firm power value, and it is based on the first firm power value, the second firm power value and third firm power value, it is straight to obtain light beam
Diameter, center transmitance and optical power.The device for being used for pulse optical fiber index test is easy to operate, the degree of automation
Height has more professional knowledge without operator, avoids artificial error in reading, also avoids artificial uncertain factor to survey
The influence of examination.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is perspective view of the present invention for the device of pulse optical fiber index test；
Fig. 2 is top view of the present invention for the device of pulse optical fiber index test；
Fig. 3 is side view of the present invention for the device of pulse optical fiber index test.
Description of symbols:
1- side plate；2- bottom plate；3- power meter；4- optoisolator sleeve；5- pulse optical fiber；6- one-dimensional translation stage；
7- two dimension cross slid platform；8- translation stage；9- slide unit.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
As shown in Figure 1, Figure 2 and shown in Fig. 3, the dress provided in an embodiment of the present invention for pulse optical fiber index test
It sets, comprising: power meter 3, optoisolator sleeve 4, one-dimensional translation stage 6 and two-dimentional cross slid platform 7, the shape of optoisolator sleeve 4
Shape is gun-shaped, and for optoisolator sleeve 4 for placing pulse optical fiber, power meter 3 and optoisolator sleeve 4 are coaxially arranged,
Power meter 3 is used for the laser that acquisition pulse optical fiber laser 5 issues, and the of multiple and different apertures is provided in one-dimensional translation stage 6
One diaphragm is provided with second diaphragm in multiple and different apertures on two-dimentional cross slid platform 7；The aperture of multiple first diaphragms and multiple
The aperture of two diaphragms is all different；The aperture of first diaphragm and the second diaphragm can according to the testing requirement of different model product into
Row customization, the test of the compatible a variety of pulse lasers of a device, save the cost；
One-dimensional translation stage 6 is moved for inclined direction, so that multiple first diaphragms move on the propagation ducts of laser；Two
It ties up cross slid platform 7 to move for horizontal direction and vertical direction, so that multiple second diaphragms move on the propagation ducts of laser.
Two-dimentional cross slid platform 7 can carry out X and Y-axis movement, and the second diaphragm is driven to be moved, and the second diaphragm may be implemented " to return " word
Shape, point by point scanning method, XY maximum point scanning method, crossing method and climbing method search maximum value, minimum according to motion profile
The specific location of the point of value.
In embodiments of the present invention, any the first diaphragm and any second diaphragm stated is obtained not in the propagation ducts of laser
When first firm power value of laser, laser part pass through one of the first diaphragm when upper second firm power value of laser with
And the third firm power value of laser laser when passing completely through one of them second diaphragm, and based on the first firm power value, the
Two firm power values and third firm power value, obtain beam diameter, center transmitance and optical power.This is used for pulse fiber
The device of laser index test is easy to operate, high degree of automation, has more professional knowledge without operator, avoids
Artificial error in reading also avoids influence of the artificial uncertain factor to test.
On the basis of the above embodiments, which further includes 2 He of bottom plate
The side plate 1 of the surrounding set on bottom plate is enclosed, power meter 3, optoisolator sleeve 4, one-dimensional translation stage 6 and two-dimentional cross slid platform 7 are
It is installed on bottom plate 2 by M6 screw, by multiple component centralized layouts on a bottom plate, reduces occupy-place and many and diverse wiring, side
Plate 1 is for laser to be isolated from the outside.
In embodiments of the present invention, when installation the output optoisolator outer diameter of pulse optical fiber and gun-shaped light every
Consistent, guarantee concentricity is needed from device sleeve diameter size；Using concentric limit cylindrical body to the first light in one-dimensional translation stage
Door screen and gun-shaped optoisolator sleeve carry out concentricity calibrating, guarantee that two holes are less than 0.01mm with one heart；Gun-shaped optoisolator sleeve
Aluminium product can be used to be made；Sheet metal structural can be used in side plate 1, plays the role of that scattering laser is isolated, makes operator
It is safer in checkout procedure.
On the basis of the above embodiments, one-dimensional translation stage 6 includes translation stage 8, the first stepper motor and the first lead screw；
The both ends of first lead screw pass through bearing and are installed on the first lead screw support base, and one end of the first lead screw passes through shaft coupling
Device is connected to the output shaft of the first stepper motor, and the first lead screw support base is installed on bottom plate 2 by M6 screw；Translation stage 8 is pacified
Multiple first diaphragms are provided with loaded on the first lead screw, and on translation stage 8.
In embodiments of the present invention, it is rotated by the first lead screw of task driven of the first stepper motor, in turn
Translation stage 8 is driven to be moved, and the propagation ducts route of the direction of motion of the first diaphragm and laser is perpendicular.
On the basis of the above embodiments, the axis of the axis and bottom plate 2 of the first lead screw support base is at an acute angle.
In embodiments of the present invention, in order to avoid translation stage 8 is directly collided with gun-shaped optoisolator sleeve, the first lead screw branch
Support seat axis and bottom plate 2 axis it is into θ angle, i.e. the first lead screw support base be in tilted layout, the angle θ can be 8 °, 15 °, 30 ° or
45°.Bottom plate 2 can be rectangular base plate, and the first lead screw support base can be the first lead screw of rectangle support base, the axis side of bottom plate 2
To referring to that, along its length direction, the axis direction of the first lead screw support base refers to along its length direction.
On the basis of the above embodiments, one-dimensional translation stage 6 further includes the first stepping motor driven being installed on side plate 1
Device, the first stepper motor driver are connect with the first stepper motor.
In embodiments of the present invention, the first stepper motor driver is used for motion control signal amplification, the driving first step
Into motor, can 256 grades of band subdivisions, promote control precision.First stepper motor can be 2 phase, the 4 line stepping electricity of 1.8 ° of step angles
Machine, structure is simple, service life long feature.
On the basis of the above embodiments, two-dimentional cross slid platform include slide unit 9, second stepper motor, third stepper motor,
Second lead screw and third lead screw；
The both ends of second lead screw pass through bearing and are installed on the second lead screw support base, and one end of the second lead screw passes through shaft coupling
Device is connected to the output shaft of second stepper motor, and the second lead screw support base is installed on bottom plate 2 by M6 screw；
The both ends of third lead screw pass through bearing and are installed on third lead screw support base, and one end of third lead screw passes through shaft coupling
Device is connected to the output shaft of third stepper motor, and one end of third lead screw support base is fixedly installed on the second lead screw, and second
Thick stick and third lead screw support base are arranged vertically, and slide unit 9 is installed on third lead screw, and multiple second diaphragms are provided on slide unit 9.
In embodiments of the present invention, it is rotated by the second lead screw of the task driven of second stepper motor, in turn
It drives third lead screw support base to carry out the movement of X-direction, is revolved by the task driven third lead screw of third stepper motor
Transhipment is dynamic, and then drives the movement of the progress Y direction of slide unit 9, and the propagation ducts of the direction of motion of the second diaphragm and laser
Route is perpendicular.
On the basis of the above embodiments, the aperture of the second diaphragm is 2~10mm.
In embodiments of the present invention, the aperture of the second diaphragm can be 2.5mm and 7mm, be set as different apertures, can
With the product test for different model.
It on the basis of the above embodiments, further include the second stepper motor driver being installed on side plate 1 and third step
Into motor driver, second stepper motor driver is connect with second stepper motor, third stepper motor driver and third step
It is connected into motor.
In embodiments of the present invention, second stepper motor driver is used for motion control signal amplification, driving second step
Into motor, can 256 grades of band subdivisions, promote control precision；Third stepper motor driver is used for motion control signal amplification, drives
Dynamic third stepper motor, can 256 grades of band subdivisions, promote control precision.Second stepper motor and third stepper motor can be
2 phase, the 4 line stepper motor of 1.8 ° of step angles, structure is simple, service life long feature.
It on the basis of the above embodiments, further include magnet briquetting, the output optoisolator of pulse optical fiber 5 passes through
Magnet briquetting is fixed on optoisolator sleeve 4.
In embodiments of the present invention, the output optoisolator of pulse optical fiber 5 by magnet briquetting be fixed on light every
From device sleeve 4, the two quick assembling and separation can be made, effectively improve installation effectiveness.
On the basis of the above embodiments, which further includes data processing
Module, data processing module swash not when on the propagation ducts of laser for obtaining any first diaphragm and any second diaphragm
The the second firm power value and laser of laser when first firm power value of light, laser part pass through one of the first diaphragm
The third firm power value of laser when passing completely through one of them second diaphragm, and stablized based on the first firm power value, second
Performance number and third firm power value, obtain beam diameter, center transmitance and optical power.
In embodiments of the present invention, the output optoisolator of pulse optical fiber is placed on gun-shaped optoisolator sleeve
On, upper magnet briquetting is then pressed so that output optoisolator is fitted closely with gun-shaped optoisolator sleeve, and industrial personal computer is connected with
Computer, industrial personal computer control driving power and start to work, and driving power is used for pulse laser for 24V direct current, industrial personal computer
Be also used to control pulse laser goes out light situation, and industrial personal computer controls one-dimensional translation stage, two dimension ten by motion control card respectively
The movement of word slide unit, motion control card are used to generate the motion control signal of three stepper motors, and three stepper motor drivings are used
In will show the amplification of corresponding motion control signal and then drive three stepper motors；The collected power data of power meter passes through
Serial ports is uploaded to industrial personal computer and is analyzed；
The device for being used for pulse optical fiber index test further includes control panel, and control panel is for responding key letter
Number, the I/O signals such as corresponding indicator light, unit power supply are controlled, and upload push button signalling；Detection supply voltage, electric current are simultaneously uploaded to
Computer；Respond serial ports control, the inquiry signal of industrial personal computer；CAN bus signal is converted to rs 232 serial interface signal, and rs 232 serial interface signal is converted to
CAN bus signal.
The automatic test of selection first, starts to detect pulse optical fiber electric current, voltage, then two-dimentional cross
Slide unit and one-dimensional translation stage are removed, and not blocked pulse optical fiber and be gone out light, measured power P1；Then one-dimensional translation is moved
For platform to gun-shaped optoisolator sleeve concentric position, laser part passes through one of the first diaphragm, and measured power is P2 after stablizing,
Then one-dimensional translation stage is playbacked；Finally mobile two-dimentional cross slid platform, selects the second diaphragm of corresponding diameter, and laser passes completely through
Above-mentioned second diaphragm, measured power is P3 after stablizing.
Judge whether the readings of power meter is stable by the way of judging slope coefficient.
Method particularly includes: assuming that the performance number that power meter reads N number of points is that (n is greater than zero to a certain discrete array a [n]
Positive integer), slope k [i] indicates i-th point of slope, the calculation method of k [i] are as follows: k [i]=(a [i+1]-a [i])/a
[i].It will eventually get two array a [n] and k [n-1], if there are continuous m values to meet abs (k in the array of k [n-1]
[j]) < Value (value of Value is configurable, for example takes between 0.01 to 0.005) then indicates the point of continuous m all in stabilization
State.Then take power average value Sum (a [j], a [j+1], a [j+m-1])/m of this continuous m point as current Effective power
Rate value.
During atual detection, (about 5 seconds or so) meeting after being worth a period of time if discovery performance number curve tends towards stability
It is declined slightly, in order to capture the performance number after being declined slightly, some other criterion algorithms is added.Specific method is to give up array a
M point (value of m takes different values according to the equipment of different model), is then compared again with slope, is averaged before [n]
Method be declined slightly after performance number.
Data processing module in industrial personal computer is based on the first firm power value, the second firm power value and third and stablizes function
Beam diameter, center transmitance and optical power index is calculated in rate value.Also, beam diameter, center transmitance and light function
Rate respectively with setting product corresponding index be compared, such as center transmitance be less than preset threshold, then be determined as it is unqualified,
The warning lamp being set on side plate just will appear alarm signal, while voice prompting " unqualified "；After the completion of test, two-dimentional cross
Slide unit is removed, and industrial personal computer controls driving power, is powered off to pulse laser, and automatically generate test report.
This is used for the device of pulse optical fiber index test, reduces the operation that personnel participate in galvanization, mentions significantly
The safety of height test；Equipment judges that automatic sound-light alarm prevents from judging by accident to every test data；Automatically it finds out most
It is high-power, greatly improve testing efficiency.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of device for pulse optical fiber index test, comprising: power meter, optoisolator sleeve, one-dimensional translation
Platform and two-dimentional cross slid platform, the optoisolator sleeve is for placing pulse optical fiber, the power meter and the light
Isolator sleeve is coaxially arranged, the laser issued for acquiring the pulse optical fiber, which is characterized in that described one-dimensional flat
It is provided with first diaphragm in multiple and different apertures in moving stage, is provided with the second of multiple and different apertures on the two dimension cross slid platform
Diaphragm；
The one-dimensional translation stage is moved for inclined direction, so that multiple first diaphragms are on the propagation ducts of the laser
Movement；The two-dimension translational platform is moved for horizontal direction and vertical direction, so that multiple second diaphragms are in the laser
Propagation ducts on move.
2. the device according to claim 1 for pulse optical fiber index test, which is characterized in that further include bottom
Plate and the side plate for enclosing surrounding set on the bottom plate, the power meter, the optoisolator sleeve, the one-dimensional translation stage and
The two dimension cross slid platform is mounted on the bottom plate, and the side plate is for the laser to be isolated from the outside.
3. the device according to claim 2 for pulse optical fiber index test, which is characterized in that described one-dimensional
Translation stage includes translation stage, the first stepper motor and the first lead screw；
First lead screw is installed on the first lead screw support base, and one end of first lead screw is connected to the first stepping electricity
Machine, the first lead screw support base are installed on the bottom plate；The translation stage is installed on first lead screw, and the translation
Multiple first diaphragms are provided on platform.
4. the device according to claim 3 for pulse optical fiber index test, which is characterized in that described first
The axis of lead screw support base and the axis of the bottom plate are at an acute angle.
5. the device according to claim 3 for pulse optical fiber index test, which is characterized in that further include peace
The first stepper motor driver of dress on the side plate, first stepper motor driver and first stepper motor connect
It connects.
6. the device according to claim 2 for pulse optical fiber index test, which is characterized in that the two dimension
Cross slid platform includes slide unit, second stepper motor, third stepper motor, the second lead screw and third lead screw；
Second lead screw is installed on the second lead screw support base, and one end of second lead screw is connected to the second stepping electricity
Machine, the second lead screw support base are installed on the bottom plate；The third lead screw is installed on third lead screw support base, and described
One end of third lead screw is connected to the third stepper motor, and the third lead screw support base is installed on second lead screw,
Second lead screw and the third lead screw support base are arranged vertically, and the slide unit is installed on the third lead screw, and the cunning
Multiple second diaphragms are provided on platform.
7. the device according to claim 6 for pulse optical fiber index test, which is characterized in that described second
The aperture of diaphragm is 2~10mm.
8. the device according to claim 6 for pulse optical fiber index test, which is characterized in that further include peace
The second stepper motor driver and third stepper motor driver of dress on the side plate, the second stepper motor driver
It is connect with the second stepper motor, the third stepper motor driver is connect with the third stepper motor.
9. the device according to claim 1 for pulse optical fiber index test, which is characterized in that further include magnetic
The output optoisolator of iron pressing block, the pulse optical fiber is fixed on the optoisolator set by the magnet briquetting
Cylinder.
10. the device according to any one of claims 1 to 9 for pulse optical fiber index test, feature exist
In further including data processing module, the data processing module is for obtaining any first diaphragm and any described second
Not when on the propagation ducts of the laser, the first firm power value of the laser, the laser part pass through diaphragm
When one first diaphragm the second firm power value of the laser and the laser pass completely through one of them described
The third firm power value of laser when two diaphragms, and it is based on the first firm power value, the second firm power value
And the third firm power value, obtain beam diameter, center transmitance and optical power.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910261712.1A CN109974975B (en) | 2019-04-02 | 2019-04-02 | Device for index test of pulse fiber laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910261712.1A CN109974975B (en) | 2019-04-02 | 2019-04-02 | Device for index test of pulse fiber laser |
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| CN109974975A true CN109974975A (en) | 2019-07-05 |
| CN109974975B CN109974975B (en) | 2020-10-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112254931A (en) * | 2020-09-30 | 2021-01-22 | 武汉衡易科技有限公司 | Automatic test equipment for laser |
| CN112683491A (en) * | 2020-11-18 | 2021-04-20 | 武汉锐科光纤激光技术股份有限公司 | Automatic test system of continuous fiber laser |
| CN116625643A (en) * | 2023-05-26 | 2023-08-22 | 长沙航空职业技术学院(空军航空维修技术学院) | High-power pump source testing equipment and testing method |
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| JP6395336B2 (en) * | 2016-12-01 | 2018-09-26 | 株式会社アンウェイジャパン | Identification tool for fluid in piping |
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| US6671247B1 (en) * | 1999-11-18 | 2003-12-30 | Konica Corporation | Optical pick-up apparatus, optical element, and objective lens having diffracting section |
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| CN112254931A (en) * | 2020-09-30 | 2021-01-22 | 武汉衡易科技有限公司 | Automatic test equipment for laser |
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| CN116625643A (en) * | 2023-05-26 | 2023-08-22 | 长沙航空职业技术学院(空军航空维修技术学院) | High-power pump source testing equipment and testing method |
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| Publication number | Publication date |
|---|---|
| CN109974975B (en) | 2020-10-16 |
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