CN108627113A - Even light pipe lighting device for digital speckle pattern interferometry system - Google Patents
Even light pipe lighting device for digital speckle pattern interferometry system Download PDFInfo
- Publication number
- CN108627113A CN108627113A CN201810284041.6A CN201810284041A CN108627113A CN 108627113 A CN108627113 A CN 108627113A CN 201810284041 A CN201810284041 A CN 201810284041A CN 108627113 A CN108627113 A CN 108627113A
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- China
- Prior art keywords
- convex lens
- light pipe
- even light
- aspherical mirror
- lighting device
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/161—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
- G01B11/162—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means by speckle- or shearing interferometry
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/02—Combinations of only two kinds of elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The embodiment of the present invention provides a kind of even light pipe lighting device for digital speckle pattern interferometry system.Even light pipe lighting device includes the first convex lens, even light pipe, aspherical mirror and the second convex lens, first convex lens and the second convex lens are biconvex mirror, the both ends of aspherical mirror are respectively convex surface and plane, along the direction of illumination of light beam, first convex lens, even light pipe, aspherical mirror and the second convex lens are set gradually, wherein the first convex lens and aspherical mirror are connected to the both ends of even light pipe, come convex surface facing light beam to the entrance focus of the second convex lens is overlapped with the refractive focus of aspherical mirror on aspherical mirror.The present invention is by being arranged the first convex lens, even light pipe, aspherical mirror and the second convex lens, ensure not lose when laser passes through each component, and then ensure to form uniform light spot energy field in laser irradiation to measured object, the image that interference fringe is more clear is obtained, the accuracy for object detection using digital speckle interference technology is improved.
Description
Technical field
The present invention relates to field of optical measuring technologies more particularly to a kind of even light pipe photographs for digital speckle pattern interferometry system
Bright device.
Background technology
Digital speckle interference technology (DSPI) is a kind of whole-field optically measuring technology, is used for engineering, biomaterial and device
The physical quantitys such as deformation, strain detection, have the characteristics that non-contact, real-time measurement, high-precision, be widely used in lossless inspection
It surveys, biomedical detection, precision machinery manufactures and the fields such as vibration measurement.Determinand wherein how uniformly to be illuminated to obtain
The interferometric phase image of high quality is current urgent problem to be solved, and illumination determinand is largely laser in certain angle α at present
Illumination, when illuminating determinand, adds beam expanding lens in the front of laser, obtains opposite to obtain relatively preferable interferometric phase image
Preferable light spot energy field.It is the mode of two kinds of digital speckle interferences in the prior art below：
In the measurement of digital speckle interference in-plane deformation, laser gets laser and is divided into two-beam by spectroscope, a branch of
Light irradiates determinand from determinand side by beam expanding lens with angle [alpha], and another light beam by passing through beam expanding lens again after piezoelectric ceramics
Determinand is irradiated from the determinand other side with angle [alpha], two-beam is interfered on the test object, forms interference surface.
In the measurement of digital speckle interference in-plane deformation, laser gets laser and is divided into two-beam by spectroscope, a branch of
It is optically coupled into optical patchcord, light is transmitted to by optical patchcord by determinand side, determinand, another beam are irradiated with angle [alpha]
Light is transmitted to the determinand other side by light by being coupled into optical patchcord after piezoelectric ceramics, by optical patchcord, is shone with angle [alpha]
Penetrate determinand.Two-beam is interfered on the test object, forms interference surface.
But existing scheme has the following deficiencies or defect：Laser irradiation has to measured object edge place or center place
Missing or non-uniform phenomenon.
Invention content
The present invention provides a kind of even light pipe lighting device for digital speckle pattern interferometry system, to solve to count in the prior art
The illumination of word speckle interference system is mapped to interferometric phase image that determinand surface obtains problem of low quality.
In order to achieve the above objectives, the embodiment of the present invention provides a kind of even light pipe illumination for digital speckle pattern interferometry system
Device.The even light pipe lighting device includes the first convex lens, even light pipe, aspherical mirror, the second convex lens and wedge, and described the
One convex lens and second convex lens are biconvex mirror, and the both ends of the aspherical mirror are respectively convex surface and plane, along light
The direction of illumination of beam, first convex lens, the even light pipe, the aspherical mirror and second convex lens are set successively
It sets, wherein first convex lens and the aspherical mirror are connected to the both ends of the even light pipe, on the aspherical mirror
Described come convex surface facing the light beam to the refractive focus of the entrance focus and the aspherical mirror of second convex lens
It overlaps；Along the direction of illumination of the light beam, the wedge is arranged in the focus of second convex lens, can be deviated with one
Angle [alpha] carries out even optical illumination to shadow surface.
Optionally, the center of first convex lens, the even light pipe, the aspherical mirror and second convex lens
Line is in same horizontal line.
Optionally, the shell of the even light pipe is in cuboid, and the inside of the even light pipe has path channels, along described
The section of the path direction of light beam, the path channels becomes larger.
Optionally, the section of the path channels is rounded.
Optionally, between first convex lens and the even light pipe, between the even light pipe and the aspherical mirror, institute
State between aspherical mirror and second convex lens and be both provided between second convex lens and the wedge sealing knot
Structure.
Optionally, the even light pipe lighting device further includes reflective mirror, and the reflective mirror is arranged in second convex lens
Downstream with change light path and/or adjust field angle.
The invention has the advantages and positive effects that：
The embodiment of the present invention by be arranged in even light pipe lighting device the first convex lens, even light pipe, aspherical mirror and
Second convex lens can ensure that laser does not lose by all parts, and then ensure that shape in laser irradiation to measured object
At uniform light spot energy field, the image that interference fringe is more clear is obtained, is effectively improved and utilizes digital speckle interference skill
Accuracy of the art for object detection.In addition, even light pipe lighting device provided in an embodiment of the present invention can also be generally expanding
The uneven Gaussian Energy field that mirror expands, becomes equally distributed even light field, ensure that the detection of the digital speckle pattern interferometry system
Precision.
Description of the drawings
Fig. 1 is the schematic index path of even light pipe lighting device provided in an embodiment of the present invention；
Fig. 2 is the schematic light path that even light pipe lighting device provided in an embodiment of the present invention is used cooperatively with reflective mirror
Figure.
Reference sign：
1, the first convex lens；2, even light pipe；3, aspherical mirror；4, the second convex lens；5, wedge；6, reflective mirror.
Specific implementation mode
The exemplary embodiment of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
The embodiment of the present invention provides a kind of even light pipe lighting device for digital speckle pattern interferometry system.The even light pipe shines
Bright device include the first convex lens 1, even light pipe 2, aspherical mirror 3, the second convex lens 4 and wedge 5, the first convex lens 1 and
Second convex lens 4 is biconvex mirror, and the both ends of aspherical mirror 3 are respectively convex surface and plane, convex along the direction of illumination of light beam, first
Lens 1, even light pipe 2, aspherical mirror 3 and the second convex lens 4 are set gradually, wherein the first convex lens 1 and aspherical mirror 3 divide
Be not connected to the both ends of even light pipe 2, on aspherical mirror 3 convex surface facing light beam come to, the entrance focus of the second convex lens 4 with
The refractive focus of aspherical mirror 3 overlaps；Along the direction of illumination of light beam, wedge 5 is arranged in the focus of the second convex lens 4, with energy
It is enough that even optical illumination is carried out to shadow surface with a deviation angle α.
The embodiment of the present invention by be arranged in even light pipe lighting device the first convex lens 1, even light pipe 2, aspherical mirror 3 with
And second convex lens 4, it can ensure that laser does not lose by all parts, and then ensure that in laser irradiation to measured object
Uniform light spot energy field is formed, the image that interference fringe is more clear is obtained, is effectively improved and utilizes digital speckle interference
Accuracy of the technology to object detection.
Specifically, with reference to figure 1, light source can have the light source that brightness is high, energy is big, can ensure in light in this way
In communication process, the energy of light will not decay, and still can form clearly interference fringe on the surface of testee.In addition,
Light source should select the light source for being adapted size with above-mentioned all parts and testee, the hot spot that can avoid light source so straight
The too small insufficient light for causing to be collected into of diameter, or cause the direction of illumination along light beam to occur since the spot diameter of light source is excessive
The loss of light energy.
After light source luminescent, light passes through the first convex lens 1, even light pipe 2, aspherical mirror 3 and the second convex lens 4 successively,
Finally it is irradiated to the surface of testee.
It, can be at the refraction end of the first convex lens 1 after light injects the first convex lens 1 from the incidence end of the first convex lens 1
Reflect several parallel light.The purpose that the first convex lens 1 is arranged is that the light by diverging becomes flat after superrefraction
Capable light.It should be noted that achieve the goals above, light source needs that the focus in 1 incidence end of the first convex lens is arranged
Place, and the first convex lens 1 is biconvex mirror, i.e. and the incidence end of the first convex lens 1 and refraction end is convex surface.
Several parallel light inject even light pipe 2 from the entrance of even light pipe 2, and with total reflection in even light pipe 2
Form continues to propagate, then is projected from the outlet of even light pipe 2, and the light projected by even light pipe 2 remains several parallel light
Line.The purpose that even light pipe 2 is arranged is to be further ensured that light can be projected more uniformly on testee, that is, from even
The light that light pipe 2 projects can form rectangle light field on testee surface.It can also be at it in addition, even light pipe 2 is arranged
Exit formed a uniform light-emitting surface without formation dark space, further ensure using the digital speckle pattern interferometry system for
The Stability and veracity of object detection.
From several parallel light that the outlet of even light pipe 2 is projected from incidence end (the i.e. aspherical mirror 3 of aspherical mirror 3
On convex surface end) inject aspherical mirror 3, by the light of aspherical mirror 3 from the refraction end of aspherical mirror 3 (i.e. on aspherical mirror 3
Planar ends) project.The purpose that aspherical mirror 3 is arranged is to eliminate spherical aberration (after i.e. light penetrates convex mirror, in convex mirror
The deviation for the light convergence that focal plane generates) and credit light (i.e. light throws the light lost when aspherical mirror 3 into), it in this way can be effectively
Improve the propagation efficiency of light.In addition, several parallel light, after aspherical mirror 3, meeting is at the refraction end of aspherical mirror 3
A point (i.e. the focus at the refraction of aspherical mirror 3 end) is converged on focusing plane, that is, aspherical mirror 3 is completed to diverging
The convergence of light, while loss of the light in communication process is also efficiently avoided, correct curvature of the image and the picture of distortion
Difference, the image that can be more clear.
The second convex lens 4, light are injected from the light that the refraction end-fire of aspherical mirror 3 goes out from the incidence end of the second convex lens 4
Line reflects several parallel light after the refraction of the second convex lens 4 from the refraction end of the second convex lens 4.Setting second
The purpose of convex lens 4 is to make again the divergence of beam of convergence at parallel light, can ensure to be irradiated on measured object in this way
Light it is more uniform, marginal position and/or the center of measured object can be irradiated to, ensure that the effect of irradiation.It needs
Illustrate, to achieve the goals above, needs the entrance focus for ensureing the second convex lens 4 and the refraction end of aspherical mirror 3
Focus overlaps, and it is convex surface that the second convex lens 4, which is also biconvex mirror, the i.e. incidence end of the second convex lens 4 and refraction end,.
In addition, the first convex lens 1, even light pipe 2, aspherical mirror 3 and the second convex lens 4 can be replaced according to actual needs
Larger-sized component, it is only necessary to correspondingly be adjusted according to focal length of the corresponding component after replacement etc. opposite between all parts
Distance.
Preferably, the centerline of the first convex lens 1, even light pipe 2, aspherical mirror 3 and the second convex lens 4 is in same water
On horizontal line.
The purpose being arranged in this way is that position will not be arranged in communication process because of associated components by being effectively guaranteed light
The deviation set generates offset, influences final detection result.
Preferably, even light pipe 2 is rounded, and along the path direction of light beam, the section of even light pipe 2 becomes larger.
The purpose being arranged in this way is, when the light injected from the entrance of even light pipe 2 is not exclusively parallel, still to protect
The whole light of card is projected by the total reflection inside even light pipe 2 from the outlet of even light pipe 2, avoids light in communication process
Energy loss.In addition, even light pipe 2 is arranged to meet when circle can also be further ensured that light is propagated in even light pipe 2
To dead angle, the loss of the energy of light is avoided.
The purpose that wedge 5 is arranged is that irradiation field angle or irradiation prism can be expanded.For example, working as light direct irradiation
When to testee surface, wedge 5 need not be set, directly testee can be arranged at the refraction end of the second convex lens 4.When
When light needs to be irradiated to testee surface by certain deviation angle (such as deviation angle is α), then need to install wedge 5 additional.
Further, by wedge 5 be arranged the second convex lens 4 refraction end focal position at, it is ensured that by wedge 5 light according to
It is old that there is maximum irradiated area.The size of aforementioned α deviation angles is determined by wedge 5.
Optionally, it is coated with barrier material on the face in wedge 5 away from light beam；Barrier material is graphite and/or silver particles.
As shown in Fig. 2, wedge 5 provided in an embodiment of the present invention, by be coated on its face away from light beam graphite and/or
Silver particles can farthest ensure that all light can be reflected into the surface of testee by wedge 5 in this way.
Preferably, between the first convex lens 1 and even light pipe 2, between even light pipe 2 and aspherical mirror 3, aspherical mirror 3 and
It is both provided with sealing structure between two convex lenses 4 and between the second convex lens 4 and wedge 5.
It can prevent light from being overflowed from the link position of above-mentioned all parts in this way, prevent the reduction of light energy.For example,
Above-mentioned all parts can be arranged in the same shell, which can be cuboid or other shapes, meanwhile, it is above-mentioned each
Position of a component in the shell is adjustable, can ensure most by adjusting relative position between above-mentioned all parts in this way
Excellent radiation response.
Even light pipe lighting device tiltable provided in an embodiment of the present invention is positioned over the optical axis side positions about 100mm.Even light
Pipe lighting device is 20 ° with optical axis included angle.Rotatable mirror is located at angled placement after even light pipe lighting device, will shine
Mingguang City road is reflected on tested surface.The purpose for changing light path, adjusting field angle size can be thus achieved in this way.
It, can be with as shown in Fig. 2, even light pipe lighting device provided in an embodiment of the present invention can be also used cooperatively with reflective mirror 6
Reflective mirror 6 is arranged in the downstream of the second convex lens 4, to further realize the purpose for changing light path, adjusting field angle size.
The present invention has the advantages that：
The embodiment of the present invention by be arranged in even light pipe lighting device the first convex lens, even light pipe, aspherical mirror and
Second convex lens can ensure that laser does not lose by all parts, and then ensure that shape in laser irradiation to measured object
At uniform light spot energy field, the image that interference fringe is more clear is obtained, is effectively improved and utilizes digital speckle interference skill
Accuracy of the art for object detection.
In addition, even light pipe lighting device in the prior art has very much, but all it is mostly Gaussian Profile, the embodiment of the present invention
By the way that the first convex lens, even light pipe, aspherical mirror and the second convex lens to be made to the even light for digital speckle pattern interferometry system
Pipe lighting device makes the light field of non-uniform Gaussian Profile become the light field being evenly distributed, and is effectively guaranteed the number and dissipates
The accuracy of detection of spot interference system.Further, since most of measured object surfaces are not circle, therefore, the embodiment of the present invention carries
For even light pipe lighting device given up using general beam expanding lens, form rectangle light field on testee surface.Further, since this
The even light pipe lighting device that inventive embodiments provide makes the utilization ratio of light higher, therefore, light can be got to position farther out
It sets.In addition, even light pipe lighting device provided in an embodiment of the present invention can not only use in digital speckle pattern interferometry system, in number
It is also suitable when speckle interference acoplanarity displacement, digital speckle interference spatial carrier and effective combination between them.
In addition, irradiation field angle or irradiation prism can be expanded by the way that wedge is arranged, by deviating from light beam in wedge
It is coated with graphite and/or silver particles on face, can farthest ensure that all light can be reflected into the table of testee by wedge
Face.
In addition, by the way that sealing structure is arranged, it can prevent light from being overflowed from the link position of above-mentioned all parts, prevent
The reduction of light energy.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is 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 (6)
1. a kind of even light pipe lighting device for digital speckle pattern interferometry system, which is characterized in that including the first convex lens (1),
Even light pipe (2), aspherical mirror (3), the second convex lens (4) and wedge (5), first convex lens (1) and described second
Convex lens (4) is biconvex mirror, and the both ends of the aspherical mirror (3) are respectively convex surface and plane, along the direction of illumination of light beam, institute
The first convex lens (1), the even light pipe (2), the aspherical mirror (3) and second convex lens (4) is stated to set gradually,
In, first convex lens (1) and the aspherical mirror (3) are connected to the both ends of the even light pipe (2), described aspherical
Described on mirror (3) comes the entrance focus to, second convex lens (4) and the aspherical mirror convex surface facing the light beam
(3) refractive focus overlaps；Along the direction of illumination of the light beam, coke of wedge (5) setting in second convex lens (4)
On point, even optical illumination can be carried out to shadow surface with a deviation angle α.
2. even light pipe lighting device according to claim 1, which is characterized in that first convex lens (1), the even light
The centerline of (2), the aspherical mirror (3) and second convex lens (4) is managed in same horizontal line.
3. even light pipe lighting device according to claim 1, which is characterized in that the shell of the even light pipe (2) is in rectangular
The inside of the bodily form, the even light pipe (2) has path channels, along the path direction of the light beam, the section of the path channels
It becomes larger.
4. even light pipe lighting device according to claim 3, which is characterized in that the section of the path channels is rounded.
5. even light pipe lighting device according to claim 1, which is characterized in that first convex lens (1) with it is described even
Between light pipe (2), between the even light pipe (2) and the aspherical mirror (3), the aspherical mirror (3) and second convex lens
It is both provided with sealing structure between mirror (4) and between second convex lens (4) and the wedge (5).
6. even light pipe lighting device according to claim 1, which is characterized in that the even light pipe lighting device further includes anti-
Light microscopic (6), reflective mirror (6) setting change light path in the downstream of second convex lens (4) and/or adjust field angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810284041.6A CN108627113A (en) | 2018-04-02 | 2018-04-02 | Even light pipe lighting device for digital speckle pattern interferometry system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810284041.6A CN108627113A (en) | 2018-04-02 | 2018-04-02 | Even light pipe lighting device for digital speckle pattern interferometry system |
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| Publication Number | Publication Date |
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| CN108627113A true CN108627113A (en) | 2018-10-09 |
Family
ID=63696645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810284041.6A Pending CN108627113A (en) | 2018-04-02 | 2018-04-02 | Even light pipe lighting device for digital speckle pattern interferometry system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110145708A (en) * | 2019-06-13 | 2019-08-20 | 周翔 | A kind of coal mining tunnel lamp |
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