CN201364393Y - Shearing square prism for realizing shearing electronic speckle pattern interference - Google Patents
Shearing square prism for realizing shearing electronic speckle pattern interference Download PDFInfo
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- CN201364393Y CN201364393Y CNU2008202275649U CN200820227564U CN201364393Y CN 201364393 Y CN201364393 Y CN 201364393Y CN U2008202275649 U CNU2008202275649 U CN U2008202275649U CN 200820227564 U CN200820227564 U CN 200820227564U CN 201364393 Y CN201364393 Y CN 201364393Y
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Abstract
The utility model provides a shearing square prism for realizing shearing electronic speckle pattern interference, which consists of two right-angle triangular prisms formed by grinding common optical glass, wherein the inclined plane of one right-angle triangular prism is plated with a semi-permeable semi-reflecting membrane, and the inclined planes of the two right-angle triangular prisms are agglutinated with each other by optical cement to form the square prism; a reflecting surface of the square prism is an inclined plane which is grounded off a wedge angle alpha which is within the range of 1-20 degrees; the surfaces of incident light and emergent light on the square prism are plated with antireflective films, and the two reflecting surfaces are plated with total reflection films. The utility model utilizes the common optical glass to replace expensive calcite crystalloid in the prior art, and the shearing square prism with dislocation image can be obtained by grinding the square prism prepared by the common optical glass, so that the shearing electronic speckle pattern interference can be realized; furthermore, the shearing square prism has simple structure, low cost and good imaging effect.
Description
Technical field
The utility model relates to shearing square glass prism used in the shearing electronic speckle interference detection method, belongs to the shearing square glass prism technical field that realizes shearing electronic speckle interference.
Background technology
Utilize wollaston prism as traditional shearing electronic speckle interference technology of shearing device, acoplanarity displacement derivative field that can the Measuring Object distortion, and then can carry out Non-Destructive Testing.At present, the Apparatus and method for of realization shearing electronic speckle interference has following two kinds:
1. commonly used is the wollaston prism that utilizes calcite crystal or quartz crystal to make shown in Figure 1
This prism is made up of two right-angle prisms, and when a branch of light impinged perpendicularly on the prism surface, form two bundles in the rear surface separated from each other, the mutually perpendicular linearly polarized light of direction of vibration.Ordinary light o light and extraordinary ray e light carry out along same direction after light enters first prism, but their speed and different.After entering second prism, because the optical axis of second prism is perpendicular to the optical axis of first prism, so the ordinary light in first prism has become extraordinary ray, extraordinary ray has become ordinary light, will be respectively with relative index of refraction n on the interface of two prisms
e/ n
oAnd n
o/ n
eRefraction, the two-beam line will separate in second prism as a result, and reflect once more when leaving prism and form the polarized light that certain angle separates, and their direction of vibration is orthogonal.The angle of emergent light is approximately
Wherein, n
oAnd n
eBe respectively the ordinary light and the extraordinary ray refractive index of prism material, β is the drift angle of prism.
Utilize light path arrangement that wollaston prism 1 realizes speckle-shearing interferometry as shown in Figure 2.What come out by wollaston prism 1 is the mutually reflecting lights of the object 2 of dislocation of two bundles, and this two-beam is reference light and thing light and interfere each other, is imaged on the target surface of ccd video camera 4.But its direction of vibration is orthogonal, so need add a polaroid 3 behind prism, makes its direction of vibration identical.Its advantage is that light path arrangement is simple, and two bundle coherent light waves intensity are equal substantially, thereby can reach aplanatic requirement.Its shortcoming is that wollaston prism utilizes expensive calcite crystal or quartz crystal to make, the cost height, and size is smaller, and imaging is affected.
2. use the arranged in form light path of Michelson light path, as shown in Figure 3.In this light path, be divided into two-beam from the light of object 2 through square glass prism, through 5 reflections of two catoptrons, be imaged on the target surface of ccd video camera 4 again.Only need to regulate the pitch angle of one of them catoptron, can reach the effect of image offset.The advantage of this system is that the light angle of departure is adjustable continuously, and shear direction also can change, and can control shear direction and shearing displacement, to satisfy different measuring accuracy requirements.The image that this shortcoming is object is through the emission of a plurality of reflectings surface of square glass prism, and the doubling of the image greatly reduces the effect of interference fringe.
Summary of the invention
The utility model is realized problems such as the device costliness that exists in used device of shearing electronic speckle interference and the system or interference fringe be of poor quality at existing, provides that a kind of cost is low, the interference fringe quality is good, can realize the shearing square glass prism of shearing electronic speckle interference.
The shearing square glass prism of realization shearing electronic speckle interference of the present utility model is made up of the right angle trigonometry prism that two ordinary optical glass grind, be coated with semi-transparent semi-reflecting film on the inclined-plane of one of them right angle trigonometry prism, the inclined-plane of these two right angle trigonometry prisms forms square glass prism with the optics glue bond together, a reflecting surface of this square glass prism is the inclined-plane that grinds off a locking angle, α 1 ' to 20 ' between, plane of light incidence and exit facet at square glass prism are coated with anti-reflection film, and two reflectings surface all are coated with total reflection film.
Such scheme becomes the inclined-plane after a reflecting surface of square glass prism is ground off a locking angle by original facing directly, and the light of incident is through the on-right angle reflection like this, and two bundle light of outgoing have just separated.It is fixed that the size dimension of this shearing square glass prism can come according to the bore of imaging len, if the angle that the square glass prism reflecting surface grinds off is α, then the light beam angle (splitting angle) of separating is 2 α.According to the distance of imaging and the size dimension of test specimen, α 1 ' to 20 ' between.
The utility model adopts ordinary optical glass to replace the calcite crystal of costliness in the prior art, grind the shearing square glass prism that has obtained image offset by square glass prism, realized shearing electronic speckle interference the ordinary optical glass preparation, simple in structure, with low cost, imaging effect is good.
Description of drawings
Fig. 1 is the structural representation of wollaston prism commonly used.
Fig. 2 utilizes wollaston prism to realize the light path arrangement synoptic diagram of speckle-shearing interferometry.
Fig. 3 utilizes the Michelson light path to realize the synoptic diagram of shearing electronic speckle interference.
Fig. 4 is the structural representation of shearing square glass prism of the present utility model.
Fig. 5 is the light path synoptic diagram of the utility model shearing square glass prism.
Fig. 6 is for using the light path synoptic diagram of the utility model shearing square glass prism.
Among the figure: 1, wollaston prism, 2, object, 3, polaroid, 4, ccd video camera, 5, catoptron, 6, shearing square glass prism.
Embodiment
Embodiment
As shown in Figure 4, shearing square glass prism of the present utility model is made up of the right angle trigonometry prism 1 that two ordinary optical glass grind, be coated with semi-transparent semi-reflecting film on the inclined-plane of one of them right angle trigonometry prism, the inclined-plane of these two right angle trigonometry prisms forms square glass prism with the optics glue bond together, one lateral reflection face of this square glass prism grinds off a little locking angle, become an inclined-plane, this angle of wedge can require 1 according to sensitivity ' to 20 ' between select, be the base-in grinding with the crossing seamed edge in the inclined-plane of this reflecting surface and right angle trigonometry prism when grinding.Plane of light incidence and exit facet at square glass prism are coated with anti-reflection film, and two reflectings surface all are coated with total reflection film.As shown in Figure 5, the light of incident is through on-right angle reflection, and two bundle light of outgoing have just separated, if on one side the angle that square glass prism grinds off is α, then the light beam angle of separating is 2 α.It is fixed that the size dimension of this shearing square glass prism can come according to the bore of imaging len.
As shown in Figure 6, the incident light plane of shearing square glass prism 6 of the present utility model is facing to object 2, and emergent light is facing to ccd video camera 4.Object 2 is that periphery is fixing, the aluminium disks of center loaded, the thick 2mm of disk, and diameter is 60mm, the center loads with milscale.Object 2 is about one meter with the distance of shearing square glass prism 6.After object 2 was expanded light illumination beam, the reflected light on object plane surface was through shearing square glass prism 6, ccd video camera 4 imagings.About 50 millimeters of the imaging lens bore of ccd video camera 4, shearing square glass prism 6 are also got 50 millimeters * 50 millimeters.The imaging of ccd video camera 4 sends computing machine to by image card, and carries out treatment of picture in computing machine.Use shearing square glass prism 6 as shearing elements before ccd video camera 4, the light field of two dislocation pictures that it produces is even.Object beam is by behind the prism, and what come out is the two bundles thing light waves of dislocation mutually, and this two-beam is reference light and thing light and interfere each other.Images acquired and subtracting each other in real time respectively before the deformation of body and after the distortion, the relevant striped of the speckle that presents after subtracting each other is presented on the monitor.As seen, utilize this shearing square glass prism can realize shearing electronic speckle interference.
Claims (1)
1. shearing square glass prism of realizing shearing electronic speckle interference, this shearing square glass prism is made up of the right angle trigonometry prism that two ordinary optical glass grind, be coated with semi-transparent semi-reflecting film on the inclined-plane of one of them right angle trigonometry prism, the inclined-plane of these two right angle trigonometry prisms forms square glass prism with the optics glue bond together, it is characterized in that: a reflecting surface of this square glass prism is the inclined-plane that grinds off a locking angle, α 1 ' to 20 ' between, plane of light incidence and exit facet at square glass prism are coated with anti-reflection film, and two reflectings surface all are coated with total reflection film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202275649U CN201364393Y (en) | 2008-12-18 | 2008-12-18 | Shearing square prism for realizing shearing electronic speckle pattern interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202275649U CN201364393Y (en) | 2008-12-18 | 2008-12-18 | Shearing square prism for realizing shearing electronic speckle pattern interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201364393Y true CN201364393Y (en) | 2009-12-16 |
Family
ID=41475061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202275649U Expired - Fee Related CN201364393Y (en) | 2008-12-18 | 2008-12-18 | Shearing square prism for realizing shearing electronic speckle pattern interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201364393Y (en) |
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2008
- 2008-12-18 CN CNU2008202275649U patent/CN201364393Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091216 Termination date: 20101218 |