CN203881306U - Surface shape detector for large-aperture lens based on fringe reflection - Google Patents
Surface shape detector for large-aperture lens based on fringe reflection Download PDFInfo
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- CN203881306U CN203881306U CN201420199226.4U CN201420199226U CN203881306U CN 203881306 U CN203881306 U CN 203881306U CN 201420199226 U CN201420199226 U CN 201420199226U CN 203881306 U CN203881306 U CN 203881306U
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- video camera
- flat board
- projector
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- minute surface
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Abstract
The utility model discloses a surface shape detector for a large-aperture lens based on fringe reflection. The detector comprises a projector, a first camera, a flat plate and a second camera, wherein the flat plate is provided with a middle hole for accommodating the second camera, the projector and the first camera are placed under the flat plate and respectively at the two sides of the middle hole, and the included angle between the central axis of the projector/first camera and the flat plate is 40 to 50 degree. The detector can be applied to detecting large-aperture lenses, solves the problem that the measuring aperture of a present fringe-reflection lens measuring device is limited due to the fact that the size of a display for projection is limited, inclined photographing can be avoided, and the measuring resolution of the system is improved.
Description
Technical field
The utility model belongs to optical measurement field, particularly a kind of heavy caliber mirror shape pick-up unit based on streak reflex.
Background technology
Often use the more than 0.5 meter minute surface of bore at astronomical sight, space exploration and energy field, these heavy caliber minute surfaces are required to be processed into special face shape, comprise sphere, quadric surface and more complicated free form surface.Minute surface is in process, and constantly detection faces shape, to ensure correctly carrying out of processing.And for free form surface, cannot use traditional interference detection method.
Industrial circle, for the detection of free form surface minute surface, adopts three coordinate machine, contourgraph or calculation holographic interferometry conventionally now.Wherein contourgraph measurement range is limited, can not be used for the detection of heavy caliber minute surface; The measuring speed of three coordinate machine is extremely slow, affects working (machining) efficiency, and it is little to measure sampled point quantity; Although calculation holographic method precision is high, minute surface of every test all will be processed separately a hologram sheet, causes its dirigibility deficiency, cost high.
Streak reflex method has very high efficiency and dirigibility in the time detecting mirror shape, is applicable to detect all kinds minute surface.But existing streak reflex method detection technique is generally used LCD display projection standing striation, is subject to the restriction of display sizes, is difficult to measure heavy caliber minute surface.Meanwhile, display and video camera must be positioned at the both sides of minute surface normal, adopt oblique projection, and the stripe pattern that therefore video camera catches is compressed in a direction, have reduced the Measurement Resolution of this direction.
Utility model content
The purpose of this utility model is the deficiency existing for prior art, and a kind of heavy caliber mirror shape detection method and device based on streak reflex of measuring bore finiteness problem and having improved systematic survey resolution of having solved is provided.
For realizing above-mentioned utility model object, the technical solution adopted in the utility model is a kind of heavy caliber mirror shape detection method based on streak reflex, comprises the following steps:
Step 1: use projector to flat board projection standing striation image, comprise horizontal standing striation image and longitudinal standing striation image, its middle plateform center is provided with dull and stereotyped mesopore, and the size of dull and stereotyped mesopore just in time can be held camera lens, sets up dull and stereotyped coordinate system taking the dull and stereotyped lower left corner as initial point;
Step 2: projector projects horizontal standing striation image to flat board, is taken by the first video camera, uses phase-shifting method to calculate the horizontal phase x on flat board to stripe pattern;
Step 3: place in the x-direction standard length thing on flat board, by the first video camera, it is taken, can obtain the grid scale factor by the length of standard length thing:
Wherein x
prepresent the grid scale factor,
with
represent respectively the phase value of this step Plays length thing one end and the other end, image Plays length thing one end and the directly horizontal phase place from flat board of the residing position of the other end that the two is taken according to the first video camera
correspondence position read, L is the length of standard length thing;
Step 4: the horizontal standing striation image on flat board becomes transversely deforming stripe pattern after tested mirror-reflection, is taken by the second video camera, obtains the phase theta of transversely deforming stripe pattern by phase-shifting method
x, the horizontal phase place on the flat board obtaining according to step 2
the grid scale factor x obtaining with step 3
p, the horizontal direction gradient that obtains tested minute surface is:
Wherein ω
xrepresent the horizontal direction gradient of tested minute surface, D is the dull and stereotyped distance to tested minute surface;
Step 5: projector projects longitudinal standing striation image to flat board, takes the longitudinal standing striation image on flat board by the first video camera, uses phase-shifting method to calculate the longitudinal phase place on flat board to stripe pattern
Step 6: place in the y-direction standard length thing on flat board, by the first video camera, it is taken, obtain longitudinal scale factor:
Wherein y
prepresent longitudinal scale factor,
with
represent respectively the phase value of this step Plays length thing one end and the other end, image Plays length thing one end and the directly longitudinal phase place from flat board of the residing position of the other end that the two is taken according to the first video camera
correspondence position read;
Step 7: projector projects longitudinal standing striation image to flat board, after tested mirror-reflection, become linear deformation stripe pattern, taken by the second video camera, obtain the phase theta y of linear deformation stripe pattern by phase-shifting method, the longitudinal phase place on the flat board obtaining according to step 5
with longitudinal scale factor yp that step 6 obtains, the vertical direction gradient that obtains tested minute surface is:
Wherein ω y represents the vertical direction gradient of tested minute surface;
Step 8: to the horizontal direction gradient ω of tested minute surface
xwith the vertical direction gradient ω to tested minute surface
ycarry out the face shape that numerical integration obtains tested minute surface.
The invention also discloses the pick-up unit based on this detection method, comprise projector, the first video camera, flat board, the second video camera; Described flat board is provided with places the mesopore of the second video camera, and described projector and the first position for video camera be in dull and stereotyped below, and lays respectively at the both sides of mesopore, and the axis of the two becomes 40 ° of-50 ° of angles with flat board.
Preferably, the axis of described projector and the first video camera with dull and stereotyped at 45 ° ± 5 ° of angles.
Most preferred scheme is: the axis of described projector and the first video camera and dull and stereotyped angle at 45 °.
Beneficial effect: the utility model is applicable to detect heavy caliber minute surface, solve existing streak reflex minute surface measurement mechanism and caused measuring the limited problem of bore because projection display sizes is limited, can avoid oblique photography, promoted the Measurement Resolution of system simultaneously.
Brief description of the drawings
Fig. 1 is detection light path schematic diagram of the present utility model;
Fig. 2 is horizontal standing striation image and longitudinal standing striation image;
Fig. 3 uses sounding rod to demarcate the schematic diagram of the grid scale factor;
Fig. 4 uses sounding rod to demarcate the schematic diagram of longitudinal scale factor;
Fig. 5 is the longitudinal phase place on horizontal phase place and the flat board on flat board;
Fig. 6 is horizontal direction deforming stripe image and vertical direction deforming stripe image;
Fig. 7 is the horizontal direction gradient of tested minute surface and the vertical direction gradient of tested minute surface;
Fig. 8 is the face shape of tested minute surface.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, the present embodiment is implemented under taking technical solutions of the utility model as prerequisite, should understand these embodiment and only be not used in restriction scope of the present utility model for the utility model is described.
As shown in Figure 1, a kind of heavy caliber mirror shape pick-up unit based on streak reflex, comprises projector 1, the first video camera 2, flat board 3, the second video camera 4; Described dull and stereotyped 3 are provided with the mesopore 5 of placing the second video camera 4, and described projector 1 and the first video camera 2 are positioned at dull and stereotyped 3 belows, and lay respectively at the both sides of mesopore 5, the axis of the two and dull and stereotyped angle at 45 °.
Step 1: standing striation image (comprising horizontal standing striation image and longitudinal standing striation image) is projected to planar surface by projector, the standing striation image of planar surface is taken by the first video camera, and the deforming stripe image obtaining after tested mirror-reflection is taken by the second video camera simultaneously.Standing striation image is sinusoidal straight parallel striped, wherein writing of horizontal standing striation image:
And longitudinally standing striation image can be write:
Wherein I represents the gray scale of stripe pattern, x and y are respectively the ordinates in horizontal ordinate and the stripe pattern in stripe pattern, M and N are respectively the striped frequency of x direction and the striped frequency of y direction, for the striped density of control criterion stripe pattern, value in general measure is advisable with 10 to 20, is decided to be 10 in this example;
for striped initial phase, according to phase-shifting method need to be set to 0, pi/2, π, four numerical value of 3 pi/2, in Fig. 2, shown M and N equal 10,
be 0 horizontal standing striation image and longitudinal standing striation image; Set up coordinate system taking the dull and stereotyped lower left corner as initial point.
Step 2: projector projects horizontal standing striation image to flat board, according to phase-shifting method, sets striped initial phase
value be respectively 0, in the situation of pi/2, π, 3 pi/2s, photograph the horizontal standing striation image of four width on flat board by the first video camera respectively, its gray scale is followed successively by I
1, I
2, I
3, I
4, the horizontal phase place that can obtain on dull and stereotyped is:
Horizontal phase place on flat board
result of calculation as shown in Figure 5.
Step 3: in conjunction with Fig. 2, on flat board, place in the x-direction standard length thing, the standard length thing using in the present embodiment is sounding rod, by the first video camera, it is taken, due to sounding rod and dull and stereotyped in same plane, therefore can obtain the grid scale factor by sounding rod length:
Wherein x
prepresent the grid scale factor,
with
represent respectively the phase value of sounding rod one end and the other end, sounding rod left end and the directly horizontal phase place from flat board of the residing position of right-hand member in the two image of taking according to the first video camera
correspondence position read, be respectively in this example-7.5rad and 7.5rad; Sounding rod length L is measured in advance by measurer (vernier caliper etc.), and its value is 1 meter; Therefore the value of grid scale factor xp is-1/15.
Step 4: the horizontal standing striation image on flat board becomes transversely deforming stripe pattern after tested mirror-reflection, is taken by the second video camera, as shown in Figure 6, obtains the phase theta of transversely deforming stripe pattern by the phase-shifting method identical with above-mentioned steps 2
x, the horizontal phase place on the flat board obtaining according to step 2
the grid scale factor x obtaining with step 3
p, the horizontal direction gradient that obtains tested minute surface is:
Wherein ω
xrepresent the horizontal direction gradient of tested minute surface, D is the dull and stereotyped distance to tested minute surface, can obtain by various measurers or laser range finder, and the measurement result in this example is 0.5 meter, the horizontal direction gradient ω of the tested minute surface therefore calculating
xas shown in Figure 7.
Step 5: projector projects longitudinal standing striation image to flat board, takes the longitudinal standing striation image on flat board by the first video camera, uses the phase-shifting method identical with above-mentioned steps 2 to calculate the longitudinal phase place on flat board to image
Step 6: in conjunction with Fig. 4, place in the y-direction sounding rod on flat board, by the first video camera, it is taken, obtain longitudinal scale factor:
Wherein y
prepresent longitudinal scale factor,
with
represent respectively the phase value of sounding rod one end and the other end in this step, the directly longitudinal phase place from flat board of residing position, sounding rod top and bottom in the two image of taking according to the first video camera
correspondence position read, be respectively in this example-9rad and 9rad, therefore longitudinal scale factor y
pvalue be-1/18.
Step 7: projector projects longitudinal standing striation image to flat board, becomes linear deformation stripe pattern after tested mirror-reflection, is taken by the second video camera, as shown in Figure 6, obtains the phase theta of linear deformation stripe pattern by phase-shifting method
y, the longitudinal phase place on the flat board obtaining according to step 5
the longitudinal scale factor y obtaining with step 6
p, the vertical direction gradient that obtains tested minute surface is:
Wherein ω
ythe vertical direction gradient that represents tested minute surface, result of calculation as shown in Figure 7.
Step 8: to the horizontal direction gradient ω of tested minute surface
xvertical direction gradient ω with tested minute surface
ycarry out the face shape that numerical integration obtains tested minute surface, result of calculation as shown in Figure 8.
Claims (3)
1. the heavy caliber mirror shape pick-up unit based on streak reflex, is characterized in that: comprise projector (1), the first video camera (2), dull and stereotyped (3), the second video camera (4); Described flat board (3) is provided with the mesopore (5) of placing the second video camera (4), described projector (1) and the first video camera (2) are positioned at flat board (3) below, and lay respectively at the both sides of mesopore (5), the axis of the two becomes 40 ° of-50 ° of angles with dull and stereotyped (3).
2. a kind of heavy caliber mirror shape pick-up unit based on streak reflex according to claim 1, is characterized in that: the axis of described projector (1) and the first video camera (2) and dull and stereotyped (3) are at 45 ° ± and 5 ° of angles.
3. according to a kind of heavy caliber mirror shape pick-up unit based on streak reflex described in claim 1 or 2, it is characterized in that: the axis of described projector (1) and the first video camera (2) and dull and stereotyped (3) angle at 45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420199226.4U CN203881306U (en) | 2014-04-22 | 2014-04-22 | Surface shape detector for large-aperture lens based on fringe reflection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420199226.4U CN203881306U (en) | 2014-04-22 | 2014-04-22 | Surface shape detector for large-aperture lens based on fringe reflection |
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| Publication Number | Publication Date |
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| CN203881306U true CN203881306U (en) | 2014-10-15 |
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|---|---|---|---|
| CN201420199226.4U Expired - Fee Related CN203881306U (en) | 2014-04-22 | 2014-04-22 | Surface shape detector for large-aperture lens based on fringe reflection |
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2014
- 2014-04-22 CN CN201420199226.4U patent/CN203881306U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141015 Termination date: 20190422 |