CN107132659A - A kind of laser beam layer production method and device - Google Patents
A kind of laser beam layer production method and device Download PDFInfo
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- CN107132659A CN107132659A CN201710517511.4A CN201710517511A CN107132659A CN 107132659 A CN107132659 A CN 107132659A CN 201710517511 A CN201710517511 A CN 201710517511A CN 107132659 A CN107132659 A CN 107132659A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0944—Diffractive optical elements, e.g. gratings, holograms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0972—Prisms
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
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- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- General Engineering & Computer Science (AREA)
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- Semiconductor Lasers (AREA)
- Laser Surgery Devices (AREA)
Abstract
The invention discloses a kind of laser beam layer production method and device, described device includes：Generating laser and laser regulating part；Wherein, the generating laser, for launching laser beam to the laser regulating part；The laser regulating part, the transmission direction for changing the laser beam is formed in parallel with the laser beam layer of reference plane transmission and expanded angle for predetermined angle.
Description
Technical field
The present invention relates to screen display technology field, more particularly to a kind of laser beam layer production method and device.
Background technology
With developing rapidly for touch-control Display Technique, the demand of large touch display screen is more and more stronger, is making
, it is necessary to using laser optical plane (LLP, Laser Light Plane) multiconductor principle of induction, swash to make a level in journey
Light light film (light beam layer) covers whole zone of control, as shown in Figure 1.
In order to reach larger laser film coverage rate, touch area often is covered using many generating laser bursts, but
Because the laser light film of each generating laser generation when multiple smooth films it is difficult to ensure that in same level, be superimposed
When, it can run into and be superimposed out a became uneven, and very thick light film, because light film is very thin in itself, it may appear that multilayer
The situation of light film covering, and multilayer optical film easily causes false triggering.
The content of the invention
The embodiment of the present invention provides a kind of laser beam layer production method and device, can produce exhibition using a laser
Angle of release degree is the laser beam layer of predetermined angle.
What the technical scheme of the embodiment of the present invention was realized in：
The embodiments of the invention provide a kind of laser beam layer generation device, described device includes：Generating laser and swash
Light regulating part；Wherein,
The generating laser, for launching laser beam to the laser regulating part；
The laser regulating part, the transmission direction for changing the laser beam, be formed in parallel with reference plane transmission and
Expanded angle is the laser beam layer of predetermined angle.
In such scheme, described device also includes：Thickness degree regulating part in laser beam layer transmission path；
The thickness degree regulating part, the layer thickness value for changing the laser beam layer is preset value.
In such scheme, the thickness degree regulating part is grating regulating part, big for the grating opening by itself setting
The small layer thickness value for changing laser beam layer is preset value.
In such scheme, described device also includes：
Angle adjusting piece, the opening portion with the predetermined angle, for the laser light formed to the laser regulating part
Beam layer carries out blocking for the outer light beam of the predetermined angle, outgoing laser beams is formed the laser beam of the predetermined angle
Layer.
In such scheme, described device also includes：
Built-up jig, the two ends for generating laser and laser regulating part to be fixed on to the built-up jig；
The built-up jig includes：
Height adjusting part, for adjusted by adjusting the position of the laser regulating part laser beam layer with it is described
The distance between reference plane.
In such scheme, the laser regulating part is axicon lens, and the predetermined angle is at least 180 °.
The embodiment of the present invention additionally provides a kind of laser beam layer production method, applied to including generating laser and laser
The laser beam layer generation device of regulating part, methods described includes：
Control laser transmitter projects laser beam；
The transmission direction of the laser beam changes through laser regulating part, is formed in parallel with reference plane transmission and deploys
Angle is the laser beam layer of predetermined angle.
In such scheme, described device also includes：Thickness degree regulating part in laser beam layer transmission path；
Methods described also includes：
Thickness degree of the laser beam layer after the thickness degree regulating part changes, and the layer thickness value after change
For predetermined value.
In such scheme, the thickness degree regulating part is grating regulating part；Methods described also includes：
Thickness degree of the laser beam layer after the grating regulating part changes, and the layer thickness value after changing by
The grating openings of sizes of the grating regulating part is determined.
In such scheme, described device also includes the angle adjusting piece of the opening portion with predetermined angle；Methods described is also
Including：
Segment beam of the laser beam layer that the laser beam is formed through laser regulating part after the angle adjusting piece
It is blocked, outgoing laser beams form the laser beam layer of the predetermined angle；Wherein, the laser beam portion being blocked is by institute
The opening portion size for stating angle adjusting piece is determined.
In above-mentioned laser beam layer production method and device provided in an embodiment of the present invention, described device includes：Laser is sent out
Emitter and laser regulating part；Wherein, the generating laser, for launching laser beam to the laser regulating part；It is described to swash
Light regulating part, the transmission direction for changing the laser beam is formed in parallel with reference plane transmission and expanded angle is default
The laser beam layer of angle.It so, it is possible to use a laser to produce laser beam layer of the expanded angle for predetermined angle.
Brief description of the drawings
Fig. 1 is the schematic diagram that laser beam layer is generated using laser；
Fig. 2 a are the tangent plane structural representation one of laser beam layer generation device in the embodiment of the present invention；
Fig. 2 b are the tangent plane structural representation two of laser beam layer generation device in the embodiment of the present invention；
Fig. 3 is the outer surface schematic diagram of laser beam layer generation device in the embodiment of the present invention；
Fig. 4 a are the tangent plane structural representation three of laser beam layer generation device in the embodiment of the present invention；
Fig. 4 b are the tangent plane structural representation four of laser beam layer generation device in the embodiment of the present invention；
Fig. 5 is the tangent plane structural representation five of laser beam layer generation device in the embodiment of the present invention；
Fig. 6 is the schematic flow sheet of laser beam layer production method in the embodiment of the present invention.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment one
The embodiments of the invention provide a kind of laser beam layer generation device, as shown in Fig. 2 a and Fig. 2 b, the present invention is implemented
Laser beam layer generation device includes in example：Generating laser 21 and laser regulating part 22；Wherein,
The generating laser 21, for launching laser beam to the laser regulating part 22；
The laser regulating part 22, the transmission direction for changing the laser beam is formed in parallel with reference plane transmission
And expanded angle is the laser beam layer of predetermined angle.
Here, in actual applications, a reference planes are set, so that the laser beam layer ultimately formed covers the reference
Plane, generating laser 21 can use the laser of relatively high power, such as 10W generating laser；The face of generating laser 21
Laser, and the outgoing side of the original laser light beam of the generating laser 21 are launched to laser regulating part 22 and the reference planes
It is vertical with the reference planes to (being changed the transmission direction before exit direction by laser regulating part 22).
When actually implementing, laser regulating part 22 can be axicon lens, can be conscope specifically；In one embodiment,
The conscope is 45 degree of conscopes, the center of the summit of conscope just to the laser beam of the outgoing of generating laser 21；
In practical application, 45 degree of conscopes of light directive, because incidence angle is 45 degree, exit direction is parallel to reference to flat after being reflected
Face, and when 45 degree of conscopes of laser beam directive, laser beam incidence angle is 45 degree, and reference planes are formed in parallel with after being reflected
Laser beam layer, when conscope bottom surface justify radius be more than laser beam radius when, the laser beam layer thickness be
For the radius d of laser beam, as shown in Figure 2 a, and when the radius that the bottom surface of conscope is justified is less than the radius of laser beam, it is somebody's turn to do
The thickness of laser beam layer is the radius s of the bottom surface circle of conscope, as shown in Figure 2 b.
Based on the above embodiment of the present invention, in actual applications, described device also includes：Passed positioned at laser beam layer
Thickness degree regulating part 23 on defeated path；Specifically, the distance between thickness degree regulating part 23 and laser regulating part 22 can be according to
Set according to being actually needed；
The thickness degree regulating part 23, the layer thickness value for changing the laser beam layer is preset value.Alternatively, exist
In practical application, the thickness degree regulating part 23 is grating regulating part, is changed for the grating openings of sizes by itself setting
The layer thickness value of laser beam layer is preset value, certainly, when implementing, and in order to obtain relatively thin laser beam layer, is generally set
Less grating opening, such as sets it to be less than smaller in the radius of the bottom surface radius of circle of conscope and laser beam.
In one embodiment, described device also includes：
Angle adjusting piece 24, the opening portion with the predetermined angle, for the laser formed to the laser regulating part
Light beam layer carries out blocking for the outer light beam of the predetermined angle, outgoing laser beams is formed the laser beam of the predetermined angle
Layer, as shown in Figure 3.
Here, when laser regulating part is 45 degree of conscopes, before the regulation of part 24 is angularly adjusted, formation is expansion
Angle is 360 degree of laser beam layer, for being actually needed, it usually needs the laser beam layer of outgoing is 180 degree, therefore, institute
State predetermined angle and be at least 180 °.
In one embodiment, described device also includes：
Built-up jig 25, for generating laser 21 and laser regulating part 22 to be fixed on into the two of the built-up jig 25
End；
When actually implementing, alternatively, built-up jig 25 includes：
Height adjusting part 26, for adjusted by adjusting the position of the laser regulating part 22 laser beam layer with
The distance between described reference plane.
Here, in actual applications, height adjusting part 26 can be flat with reference can arbitrarily to adjust laser regulating part 22
The part of distance between the surface, is such as a screw, regulation height adjusting part 26 is by adjusting between laser regulating part 22 and reference planes
Distance, realizes and adjusts the distance between the laser beam layer reflected to form and reference plane.
Using the above embodiment of the present invention, the laser beam layer that face is opened in predetermined angle production is just generated using a laser,
Simple and output stabilization, easily regulation are realized, Consumer's Experience is good.
Embodiment two
The embodiments of the invention provide a kind of laser beam layer generation device, as shown in figures 4 a and 4b, the embodiment of the present invention
Middle laser beam layer generation device includes：Generating laser 31 and laser regulating part 32；Wherein,
The generating laser 31, for launching laser beam to the laser regulating part 32；
The laser regulating part 32, the transmission direction for changing the laser beam is formed in parallel with reference plane transmission
And expanded angle is the laser beam layer of predetermined angle.
Here, in actual applications, a reference planes are set, so that the laser beam layer ultimately formed covers the reference
Plane, generating laser 31 can use the laser of relatively high power, such as 10W generating laser；The face of generating laser 31
Laser, and the outgoing side of the original laser light beam of the generating laser 31 are launched to laser regulating part 32 and the reference planes
It is vertical with the reference planes to (being changed the transmission direction before exit direction by laser regulating part 32).
When actually implementing, laser regulating part 32 can be round platform mirror (seeming to be the conscope for pruning top),
In one embodiment, the round platform mirror is 45 degree of round platform mirrors, and the center of circle in 45 degree of round platform vertex faces is just to the outgoing of generating laser 31
The center of laser beam, i.e., with the center of laser beam on the same line；In actual applications, 45 degree of round platform mirrors of directive is sharp
Light light beam is reflected, be formed in parallel with reference planes laser beam layer, and on directive round platform mirror plane (top surface) laser quilt
Reflection, backtracking；When the radius that the bottom surface of round platform mirror is justified is more than the radius of laser beam, and the radius of the top surface circle of round platform mirror
Less than laser beam radius when, the thickness d of the laser beam layer of formation subtracts round platform vertex face half for the radius m of laser beam
Footpath n, as shown in fig. 4 a；When the radius that the bottom surface of round platform mirror is justified is less than the radius of laser beam, the laser beam layer of formation
Thickness d is the height h of round platform mirror, as shown in Figure 4 b, therefore, when actually implementing, in order to obtain the less laser beam of thickness
Layer, can be by setting the height of round platform mirror to be adjusted for preset height.
In one embodiment, described device also includes：
Angle adjusting piece, the opening portion with the predetermined angle, for the laser light formed to the laser regulating part
Beam layer carries out blocking for the outer light beam of the predetermined angle, outgoing laser beams is formed the laser beam of the predetermined angle
Layer, angle adjusting piece is as shown in Figure 3.
Here, when laser regulating part is 45 degree of round platform mirrors, before the regulation of part 24 is angularly adjusted, formation is expansion
Angle is 360 degree of laser beam layer, for being actually needed, it usually needs the laser beam layer of outgoing is 180 degree, therefore, institute
State predetermined angle and be at least 180 °.
In one embodiment, described device also includes：
Built-up jig 33, for generating laser 31 and laser regulating part 32 to be fixed on into the two of the built-up jig 33
End；
When actually implementing, alternatively, built-up jig 33 includes：
Height adjusting part 34, for adjusted by adjusting the position of the laser regulating part 32 laser beam layer with
The distance between described reference plane.
Here, in actual applications, height adjusting part 34 can be flat with reference can arbitrarily to adjust laser regulating part 32
The part of distance between the surface, is such as a screw, regulation height adjusting part 34 is by adjusting between laser regulating part 32 and reference planes
Distance, realizes and adjusts the distance between the laser beam layer reflected to form and reference plane.
Using the above embodiment of the present invention, the laser beam layer that face is opened in predetermined angle production is just generated using a laser,
Simple and output stabilization, easily regulation are realized, Consumer's Experience is good.
Embodiment three
The embodiments of the invention provide a kind of laser beam layer generation device, as shown in figure 5, laser in the embodiment of the present invention
Light beam layer generation device includes：Generating laser 41 and laser regulating part 42；Wherein,
The generating laser 41, for launching laser beam to the laser regulating part 42；
The laser regulating part 42, the transmission direction for changing the laser beam is formed in parallel with reference plane transmission
And expanded angle is the laser beam layer of predetermined angle.
Here, in actual applications, a reference planes are set, so that the laser beam layer ultimately formed covers the reference
Plane, generating laser 41 can use the laser of relatively high power, such as 8W generating laser；The generating laser 41 is faced
Laser regulating part 42 and reference planes transmitting laser, and the exit direction of the original laser light beam of the generating laser 41
(being changed the transmission direction before exit direction by laser regulating part 42) is vertical with the reference planes.
When actually implementing, laser regulating part 42 can be round platform mirror, in one embodiment, and the round platform mirror is 45 degree of round platforms
Mirror, the center of the center of circle in 45 degree of round platform vertex faces just to the laser beam of the outgoing of generating laser 41, i.e., with laser beam
Center is on the same line；In actual applications, the laser beam of 45 degree of round platform mirrors of directive is reflected, and is formed in parallel with reference to flat
The laser beam layer in face, and the laser of plane (top surface) is reflected on directive round platform mirror, backtracking；When the bottom surface of round platform mirror is justified
Radius be more than laser beam radius, and round platform mirror top surface circle radius be less than laser beam radius when, formation swash
The thickness of light light beam layer subtracts round platform vertex radius surface for the radius of laser beam；Swash when the radius that the bottom surface of round platform mirror is justified is less than
During the radius of light light beam, the thickness of the laser beam layer of formation is the height of round platform mirror, is terrible when actually implementing therefore
, can be by setting the height of round platform mirror to be adjusted for preset height to the less laser beam layer of thickness.
Alternatively, described device also includes：Thickness degree regulating part 43 in laser beam layer transmission path；Tool
Body, the distance between thickness degree regulating part 43 and laser regulating part 42 can be set according to being actually needed；
The thickness degree regulating part 43, the layer thickness value for changing the laser beam layer is preset value.Alternatively, exist
In practical application, the thickness degree regulating part 43 is grating regulating part, is changed for the grating openings of sizes by itself setting
The layer thickness value of laser beam layer is preset value, certainly, when implementing, in order to obtain relatively thin laser beam layer, usual foundation
It is actually needed the less grating opening of setting.
In one embodiment, described device also includes：
Angle adjusting piece, the opening portion with the predetermined angle, for the laser light formed to the laser regulating part
Beam layer carries out blocking for the outer light beam of the predetermined angle, outgoing laser beams is formed the laser beam of the predetermined angle
Layer, angle adjusting piece is as shown in Figure 3；When actually implementing, the predetermined angle is at least 180 °.
In one embodiment, described device also includes：Laser stent 44, for generating laser 41 and laser to be adjusted
Part 42 is fixed on the two ends of the laser stent 44；
When actually implementing, alternatively, laser stent 44 includes：
Height adjusting part 45, for adjusted by adjusting the position of the laser regulating part 42 laser beam layer with
The distance between described reference plane.
Here, in actual applications, height adjusting part 45 can be flat with reference can arbitrarily to adjust laser regulating part 42
The part of distance between the surface, is such as a screw, regulation height adjusting part 45 is by adjusting between laser regulating part 42 and reference planes
Distance, realizes and adjusts the distance between the laser beam layer reflected to form and reference plane.
Example IV
The laser beam layer generation device mentioned based on the above embodiment of the present invention, is swashed the embodiments of the invention provide one kind
Light light beam layer production method, applied to the laser beam layer generation device including generating laser and laser regulating part, such as Fig. 6 institutes
Show, laser beam layer production method includes in the embodiment of the present invention：
Step 101：Control laser transmitter projects laser beam；
Step 102：The transmission direction of the laser beam changes through laser regulating part, is formed in parallel with reference plane biography
Defeated and expanded angle is the laser beam layer of predetermined angle.
Here, when actually implementing, a reference planes are set, so that the laser beam layer ultimately formed covers the reference
Plane, generating laser can use the laser of relatively high power, such as 10W generating laser；The generating laser is in face of swashing
Light regulating part and reference planes transmitting laser, and exit direction (the i.e. quilt of the original laser light beam of the generating laser
Laser regulating part changes the transmission direction before exit direction) it is vertical with the reference planes.
When actually implementing, the laser regulating part can be 45 degree of conscopes, and the summit of conscope is just to generating laser
The center of the laser beam of outgoing
In one embodiment, described device also includes：Thickness degree regulation in laser beam layer transmission path
Part；Accordingly, methods described also includes：
Thickness degree of the laser beam layer after the thickness degree regulating part changes, and the layer thickness value after change
For predetermined value.
In one embodiment, the thickness degree regulating part is grating regulating part；Methods described also includes：
Thickness degree of the laser beam layer after the grating regulating part changes, and the layer thickness value after changing by
The grating openings of sizes of the grating regulating part is determined.
In one embodiment, described device also includes the angle adjusting piece of the opening portion with predetermined angle；Methods described
Also include：
Segment beam of the laser beam layer that the laser beam is formed through laser regulating part after the angle adjusting piece
It is blocked, outgoing laser beams form the laser beam layer of the predetermined angle；Wherein, the laser beam portion being blocked is by institute
The opening portion size for stating angle adjusting piece is determined.When actually implementing, based on being actually needed, the predetermined angle is at least
180°。
The embodiment of the present invention additionally provides a kind of computer-readable storage medium, is stored thereon with computer program, the computer
Above-mentioned laser beam layer production method is realized when program is executed by processor.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can pass through
Programmed instruction related hardware is completed, and foregoing program can be stored in a computer read/write memory medium, the program
Upon execution, the step of including above method embodiment is performed；And foregoing storage medium includes：It is movable storage device, read-only
Memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or
Person's CD etc. is various can be with the medium of store program codes.
Or, if the above-mentioned integrated unit of the present invention is realized using in the form of software function module and is used as independent product
Sale in use, can also be stored in a computer read/write memory medium.Understood based on such, the present invention is implemented
The part that the technical scheme of example substantially contributes to prior art in other words can be embodied in the form of software product,
The computer software product is stored in a storage medium, including some instructions are to cause a computer equipment (can be with
It is personal computer, server or network equipment etc.) perform all or part of each of the invention embodiment methods described.
And foregoing storage medium includes：Movable storage device, ROM, RAM, magnetic disc or CD etc. are various can be with store program codes
Medium.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of laser beam layer generation device, it is characterised in that described device includes：Generating laser and laser regulating part；
Wherein,
The generating laser, for launching laser beam to the laser regulating part；
The laser regulating part, the transmission direction for changing the laser beam is formed in parallel with reference plane transmission and deployed
Angle is the laser beam layer of predetermined angle.
2. device according to claim 1, it is characterised in that described device also includes：Passed positioned at laser beam layer
Thickness degree regulating part on defeated path；
The thickness degree regulating part, the layer thickness value for changing the laser beam layer is preset value.
3. device according to claim 2, it is characterised in that
The thickness degree regulating part is grating regulating part, and laser beam layer is changed for the grating openings of sizes by itself setting
Layer thickness value be preset value.
4. device according to claim 1 or 2, it is characterised in that described device also includes：
Angle adjusting piece, the opening portion with the predetermined angle, for the laser beam layer formed to the laser regulating part
The outer light beam for carrying out the predetermined angle is blocked, and outgoing laser beams is formed the laser beam layer of the predetermined angle.
5. device according to claim 1 or 2, it is characterised in that described device also includes：
Built-up jig, the two ends for generating laser and laser regulating part to be fixed on to the built-up jig；
The built-up jig includes：
Height adjusting part, for adjusting the laser beam layer and the reference by adjusting the position of the laser regulating part
The distance between face.
6. device according to claim 1 or 2, it is characterised in that
The laser regulating part is axicon lens, and the predetermined angle is at least 180 °.
7. a kind of laser beam layer production method, it is characterised in that applied to swashing including generating laser and laser regulating part
Light light beam layer generation device, methods described includes：
Control laser transmitter projects laser beam；
The transmission direction of the laser beam changes through laser regulating part, is formed in parallel with reference plane transmission and expanded angle
For the laser beam layer of predetermined angle.
8. method according to claim 7, it is characterised in that described device also includes：Passed positioned at laser beam layer
Thickness degree regulating part on defeated path；Methods described also includes：
Thickness degree of the laser beam layer after the thickness degree regulating part changes, and the layer thickness value after change is pre-
Definite value.
9. method according to claim 7, it is characterised in that the thickness degree regulating part is grating regulating part；The side
Method also includes：
Thickness degree of the laser beam layer after the grating regulating part changes, and the layer thickness value after change is by described
The grating openings of sizes of grating regulating part is determined.
10. the method according to claim 7 or 8, it is characterised in that described device also includes the opening with predetermined angle
The angle adjusting piece in portion；Methods described also includes：
Segment beam of the laser beam layer that the laser beam is formed through laser regulating part after the angle adjusting piece is hidden
Gear, outgoing laser beams form the laser beam layer of the predetermined angle；Wherein, the laser beam portion being blocked is by the angle
The opening portion size for spending regulating part is determined.
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| CN110006358A (en) * | 2019-04-17 | 2019-07-12 | 孙雨 | A kind of measuring device of vertical deformation |
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| CN110006358A (en) * | 2019-04-17 | 2019-07-12 | 孙雨 | A kind of measuring device of vertical deformation |
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