CN1204371C - Method and device for zigzag grating projecting and phase shifting grating projecting - Google Patents
Method and device for zigzag grating projecting and phase shifting grating projecting Download PDFInfo
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- CN1204371C CN1204371C CN 03131860 CN03131860A CN1204371C CN 1204371 C CN1204371 C CN 1204371C CN 03131860 CN03131860 CN 03131860 CN 03131860 A CN03131860 A CN 03131860A CN 1204371 C CN1204371 C CN 1204371C
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Abstract
The present invention relates to a method and a device for realizing zigzag grating projection and phase shifting grating projection, which is a method and a device applied to the process of optical projection in three-dimensional measuring equipment for realizing projection of grating with luminous intensity distributed in a zigzag shape and phase shifting grating projection. The device comprises a plane disc 1, a stepping rotary motor 2, a rotating shaft 21 of the stepping rotary motor, a projection imaging lens 3, a projection light source 4, a focusing lens 5 of the projection light source and a fixing bracket 6, wherein the projection light source is positioned at one side in an outer shell 7; the projection imaging lens is positioned at the other side of the outer shell; the focusing lens of the projection light source is positioned between the projection imaging lens and the projection light source; the centerlines of the projection imaging lens, the projection light source and the focusing lens of the projection light source are on the same axis; the stepping rotary motor is positioned beside the focusing lens of the projection light source; the plane disc is positioned between the projection imaging lens and the focusing lens of the projection light source, and the center of the plane disc is fixed to the rotating shaft of the stepping rotary motor. Rectangular windows on the plane disc are uniformly distributed on the circumference of the plane disc, and grating plates are respectively inserted in the rectangular windows.
Description
One, technical field
The present invention relates to realize in a kind of optical projection process that is applied to 3-D measuring apparatus grating projectin that the light intensity indention distributes and the method and apparatus of realizing phase shifts grating projectin.
Two, background technology
Optical projection system is the important component part in many equipment such as 3-D measuring apparatus, and it has determined manufacturing cost, performance, volume of equipment etc. to a certain extent.
The method that realizes the serrate grating projectin that the light intensity indention distributes has: by programmed control liquid crystal LCD produces method that the serrate grating figure looks like to carry out projection, the grid sheet that distributed by the light transmission capacity indention carries out projection as template method etc.Preceding a kind of method needs complicated circuit even a computing machine to control, and relatively more typical formation is that a computing machine adds a computer projection machine, the cost costliness, and structure is huge.The optics grid sheet that the light transmission capacity indention of a kind of method in back distributes is made difficulty, cost costliness.
The method that realizes phase shifts grating projectin has: by programmed control liquid crystal LCD produces method that the phase shifts grating figure looks like to carry out projection, the grid sheet that is projected by the control of translation step device is done translation method etc.Preceding a kind of method can well realize phase shifts grating projectin, but has brought cost costliness, the huge problem of structure equally.Back a kind of method stepper motor that need rotate, the rotatablely move device that is converted to translation and the platform of translation realize that structure is comparatively complicated.
Three, summary of the invention
1, technical matters
The object of the invention provides the method and apparatus of realizing serrate grating projectin and phase shifts grating projectin in a kind of optical projection process that is applied to particularly to be applied in the optical projection process 3-D measuring apparatus.
2, technical scheme
The invention provides in a kind of optical projection process and realize the method for the grating projectin that the light intensity indention distributes and the method that realizes phase shifts grating projectin with simple stepping whirligig with rectangle striped grid sheet.
The present invention realizes that the device of serrate grating projectin and phase shifts grating projectin comprises plane disc, the stepping electric rotating machine, the rotating shaft of stepping electric rotating machine, the projection imaging camera lens, projection light source, the projection light source amasthenic lens, fixed support, wherein projection light source is positioned at a side of shell, the projection imaging camera lens is positioned on the shell opposite side, the projection light source amasthenic lens is between projection imaging camera lens and projection light source, the projection imaging camera lens, projection light source, the center line of projection light source amasthenic lens is positioned on same the axis, the stepping electric rotating machine is positioned at by the projection light source amasthenic lens, plane disc is between projection imaging camera lens and projection light source amasthenic lens, its center is fixed in the rotating shaft of stepping electric rotating machine, rectangular window on the plane disc is evenly distributed on the circumference of plane disc, and the lenticular lenses branch is inserted on the rectangular window in addition.Lenticular lenses is that a kind of light transmission capacity is the grid sheet that the rectangle striped distributes, and promptly being distributed alternately by complete printing opacity striped and complete light tight striped forms.
Adopting light transmission capacity is that the grid sheet that distributes of rectangle striped is as the projection gate sheet, this grid sheet placed between the light source camera lens of imaging device and the imaging lens carry out projection, place the imaging screen vertical substantially with the optical axis of imaging lens, along the trickle adjustment projection gate sheet of optical axis direction difference position, imaging lens position, imaging lens focal length, and with above-mentioned imaging screen and the imaging lens optical axis keeps basic plumbness and along imaging lens optical axis direction mobile imaging screen, obtain grating projectin's image that the light intensity indention distributes.
Be adjusted to the position that looks like screen respectively along optical axis direction, the grating projectin's image that can observe the distribution of light intensity indention has certain imaging field depth.
3, technique effect
Realize grating projectin's method that the light intensity indention distributes among the present invention, the grid sheet (being the grid sheet that complete printing opacity striped and complete light tight striped distribute alternately) that adopts the rectangular striped distribution of light transmission capacity is as the projection gate sheet, and this grid sheet is made very simple; Can on multiple materials such as glass, sheet metal, make; There is not the inaccurate problem of light transmission capacity control on the grid sheet.Thereby the manufacture process of comparing with light transmission capacity indention distribution grid sheet is very simple, and cost is very low.
Realize grating projectin's method that the light intensity indention distributes among the present invention, the depth of field of observing grating projectin's image that the light intensity indention distributes is bigger.
Realize the method for phase shifts grating projectin among the present invention, on a plane disc, can reach 10 projecting grating patterns by production quantity to dozens of, application demand very widely be can satisfy, and the volume and the corresponding cost of manufacture of equipment do not needed to increase for this reason.
Realize the method for phase shifts grating projectin among the present invention, stepping electric rotating machine rotation resolution can be easy to accomplish 40 minutes (0.045 degree) even more accurate, and the precision of phase shifts depends mainly on the positional precision that the grid line pattern is placed on the plane disc.This put procedure is carried out when making plane disc, thereby positional precision can well be guaranteed.
Four, description of drawings
Fig. 1 is that the present invention is used to realize grating projectin that the light intensity indention distributes and the device synoptic diagram of realizing the method for phase shifts grating projectin.Plane disc 1, stepping electric rotating machine 2, stepping electric rotating machine turning axle 21, projection imaging camera lens 3, projection light source 4, projection light source amasthenic lens 5, fixed support 6, stepping electric rotating machine turning axle 21 that carrying grid sheet is wherein arranged, shell 7.
Fig. 2 is the rectangular striped distribution of a kind of light transmission capacity grid sheets, the synoptic diagram of the grid sheet pattern that promptly complete printing opacity striped and complete light tight striped distribute alternately.
Fig. 3 is the synoptic diagram that the present invention is used to carry grid plate plane disk.The phase reference line 1-1 of rectangular window 1-3, first rectangular area, the center 1-2 of plane disc are wherein arranged.
Five, specific embodiments
The present invention realizes that the device of serrate grating projectin and phase shifts grating projectin comprises plane disc 1, stepping electric rotating machine 2, stepping electric rotating machine rotating shaft 21, projection imaging camera lens 3, projection light source 4, projection light source amasthenic lens 5, fixed support 6, wherein projection light source 4 is positioned at a side of shell 7, projection imaging camera lens 3 is positioned on shell 7 opposite sides, projection light source amasthenic lens 5 is between projection imaging camera lens 3 and projection light source 4, projection imaging camera lens 3, projection light source 4, the center line of projection light source amasthenic lens 5 is positioned on same the axis, stepping electric rotating machine 2 is positioned at the next door of projection light source amasthenic lens 5, plane disc 1 is between projection imaging camera lens 3 and projection light source amasthenic lens 5, its center is fixed in the stepping electric rotating machine rotating shaft 21, rectangular window 1-3 on the plane disc 1 is distributed on the circumference of plane disc 1, and lenticular lenses is inserted on the rectangular window respectively.
Lenticular lenses is that a kind of light transmission capacity is the grid sheet that the rectangle striped distributes, and promptly being distributed alternately by complete printing opacity striped and complete light tight striped forms.
Adopting light transmission capacity is that the grid sheet that distributes of rectangle striped is as the projection gate sheet, this grid sheet placed between the light source camera lens of imaging device and the imaging lens carry out projection, place the imaging screen vertical substantially with the optical axis of imaging lens, along the trickle adjustment projection gate sheet of optical axis direction difference position, imaging lens position, imaging lens focal length, and with above-mentioned imaging screen and the imaging lens optical axis keeps basic plumbness and along imaging lens optical axis direction mobile imaging screen, obtain grating projectin's image that the light intensity indention distributes.
Now be described with reference to the accompanying drawings the embodiment of the inventive method.
Realize the grating projectin that the light intensity indention distributes with rectangle striped grid sheet, concrete steps are as follows:
1, the grid sheet that distributes with the rectangular striped of light transmission capacity, the grid sheet that promptly complete printing opacity striped and complete light tight striped distribute alternately is as the projection gate sheet, as accompanying drawing 2;
2, as shown in Figure 1, set up the optical projection apparatus that a cover is made up of projection light source, projection light source amasthenic lens, projection imaging camera lens etc.;
3, carry out projection near this projection gate sheet being placed on the focus point of general optical projection system light-resource fousing camera lens, at this moment an imaging screen is placed near the imaging and focusing face of imaging lens and vertical substantially, can observes the distribute projected image of (being that black and white strip distributes alternately) of the rectangular striped of light intensity with the optical axis of imaging lens;
4, along the position of the trickle adjustment projection gate sheet of optical axis direction difference, the aperture of imaging lens, the position of imaging lens, the focal length of imaging lens, this imaging screen and imaging lens optical axis are kept vertical substantially, and edge and imaging lens optical axis direction mobile imaging screen, be easy to just can observe grating projectin's image that the light intensity indention distributes;
5, axially be adjusted to the position of picture screen respectively, the grating projectin's image that can observe the distribution of light intensity indention has certain imaging field depth.
Realize phase shifts grating projectin with simple stepping whirligig, concrete steps are as follows:
1, shown in accompanying drawing 1 and accompanying drawing 3, do a plane disc, and fix with a stepping whirligig, make the stepping whirligig can drive plane disc and do rotatablely moving of predetermined angular around the center of circle of plane disc;
2, as shown in Figure 1, set up the optical projection apparatus that a cover is made up of projection light source, projection light source amasthenic lens, projection imaging camera lens etc.;
3, as shown in Figure 1, above-mentioned plane disc is embedded in the above-mentioned optical projection apparatus together with above-mentioned stepping whirligig, make this plane disc be positioned near the focus point of projection light source amasthenic lens, and vertical substantially with the optical axis of imaging lens;
4, measure the distance of distance of center circle imaging lens optical axis on this plane disc, be made as D; Measure the size of effective rectangular area of the last projection of this plane disc, be made as A
1And B
1(A wherein
1Be the size perpendicular to the disc radius direction, B
1Size for the disc radius direction);
5, as shown in Figure 3, indicate the rectangular area of several (be made as N) non-overlapping copies on above-mentioned plane disc, make: the size of rectangular area basic identical (not requiring strict equating) is made as A and B (A≤A wherein
1, B≤B
1); It is that the center of circle, D are on the circle of radius that the center of rectangular area is positioned on the disk substantially with the circle disk center; The limit that the rectangular area is of a size of A is basically perpendicular to the disc radius direction through the center, rectangular area;
6, as shown in Figure 3, definition is the phase reference line of this rectangular area through the radius of a bit (this point preferably is positioned at the center, rectangular area) in each rectangular area, measure angle, be made as through each first rectangular area phase reference line of rectangular area phase reference line-spacing
i(i=1,2,3 ... N,
1=0);
7, determine that is treated a projecting grating pattern, the width of establishing its one-period is T, and the periodicity that needs the projection image grid line is K (K * T≤B), grid line length L (T≤A).This pattern can be the rectangular striped distribution of light transmission capacity grid sheet (being the grid sheet that complete printing opacity striped and complete light tight striped a distribute alternately) pattern as shown in Figure 2, also can be that light transmission capacity is sawtooth distribution grid sheet pattern, also can be that light transmission capacity is sinusoidal function distribution grid sheet pattern;
8, make an above-mentioned projection pattern in the 1st rectangular area on above-mentioned plane disc, make: this projection pattern is positioned at the center of rectangular area as far as possible; The grid line direction of this projection pattern is parallel to the phase reference line of this rectangular area; The starting point (establishing its phase place is 0) in a grid line cycle overlaps with rectangular area phase reference line in the middle of this projection pattern;
9, successively the i on above-mentioned plane disc (make an above-mentioned projection pattern in the individual rectangular area of i≤N), make: this projection pattern is positioned at the center of rectangular area as far as possible; The grid line direction of this projection pattern is parallel to this rectangular area phase reference line; The starting point and the rectangular area phase reference linear distance in grid line cycle are t in the middle of this projection pattern
i(t
i≤ T, its phase place
10, finish all phase places of first projection pattern after, determine that successively other treat the projecting grating pattern, copy step 7～9, other that make out of phase in remaining rectangular area are treated the projecting grating pattern;
11, in the actual projection process, with the stepping whirligig first rectangular area is rotated to projected position earlier, again for each projecting grating pattern, with stepping whirligig rotation
iAngle gets final product will be through required phase place p
iThe rectangular area rotates to projected position on the corresponding disk of projection pattern, and can obtain corresponding phase p
iThe projecting grating pattern.
Claims (1)
1, a kind of device of realizing serrate grating projectin and phase shifts grating projectin, it is characterized in that this device comprises plane disc (1), stepping electric rotating machine (2), stepping electric rotating machine rotating shaft (21), projection imaging camera lens (3), projection light source (4), projection light source amasthenic lens (5), fixed support (6), wherein projection light source (4) is positioned at a side of shell (7), projection imaging camera lens (3) is positioned on shell (7) opposite side, projection light source amasthenic lens (5) is positioned between projection imaging camera lens (3) and the projection light source (4), projection imaging camera lens (3), projection light source (4), the center line of projection light source amasthenic lens (5) is positioned on same the axis, and stepping electric rotating machine (2) is positioned at the next door of projection light source amasthenic lens (5); Plane disc (1) is positioned between projection imaging camera lens (3) and the projection light source amasthenic lens (5), and be positioned near the focus point of projection light source amasthenic lens, vertical substantially with the optical axis of imaging lens, its center is fixed in the stepping electric rotating machine rotating shaft (21), rectangular window (1-3) on the plane disc (1) is distributed on the circumference of plane disc (1) side, lenticular lenses is inserted in respectively on the rectangular window (1-3): adopting light transmission capacity is that the grid sheet that distributes of rectangle striped is as the projection gate sheet, this grid sheet placed between the light source camera lens of imaging device and the imaging lens carry out projection, the imaging screen is placed near the imaging and focusing face of imaging lens, and it is vertical substantially with the optical axis of immaging lens, obtain the projected image that light intensity becomes the rectangle striped to distribute, along optical axis direction mobile imaging screen, obtain grating projectin's image that the light intensity indention distributes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03131860 CN1204371C (en) | 2003-06-12 | 2003-06-12 | Method and device for zigzag grating projecting and phase shifting grating projecting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03131860 CN1204371C (en) | 2003-06-12 | 2003-06-12 | Method and device for zigzag grating projecting and phase shifting grating projecting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1456862A CN1456862A (en) | 2003-11-19 |
| CN1204371C true CN1204371C (en) | 2005-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03131860 Expired - Fee Related CN1204371C (en) | 2003-06-12 | 2003-06-12 | Method and device for zigzag grating projecting and phase shifting grating projecting |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102622086A (en) * | 2012-04-25 | 2012-08-01 | 上海理工大学 | Laser projection-based interactive control device |
| CN103054557B (en) * | 2013-01-08 | 2016-05-11 | 白宇 | Moire topography imaging device |
| CN103064262B (en) * | 2013-01-17 | 2015-10-28 | 清华大学 | A kind of raster phase modulator for laser interference lithographic system |
| CN103913118A (en) * | 2014-04-10 | 2014-07-09 | 深圳先进技术研究院 | Three-dimensional scanning device |
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