CN202329611U - Device for measuring three-dimensional large angle - Google Patents
Device for measuring three-dimensional large angle Download PDFInfo
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- CN202329611U CN202329611U CN2011204918654U CN201120491865U CN202329611U CN 202329611 U CN202329611 U CN 202329611U CN 2011204918654 U CN2011204918654 U CN 2011204918654U CN 201120491865 U CN201120491865 U CN 201120491865U CN 202329611 U CN202329611 U CN 202329611U
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- angle
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- polaroid
- splitting piece
- information processing
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Abstract
The utility model discloses a device for measuring a three-dimensional large angle, which includes a laser light source, polaroid, an unpolarized beam splitter, a polarized beam splitter, a rectangular optical grating, a conical lens, an image sensor, a photocell and a digital information processing system, wherein the laser emitted by the laser light source is transmitted by a first polaroid and incident to the unpolarized beam splitter; the laser reflected by the unpolarized beam splitter penetrates the conical lens to form a non-diffracting spot after the diffraction order is expanded by the rectangular optical grating, and the horizontal navigation angle and the included angle of the to-be-measured object are calculated through the non-diffracting spot; the laser transmitted by the unpolarized beam splitter is incident to a second polaroid, and the photocell arrests the laser intensity I1 reflected by the second polaroid and the laser intensity I2 transmitted by the second polaroid, and the roll angle of the to-be-measured object is obtained by taking the ratio of I1 to I2 as the anti-sine. The device for measuring the three-dimensional large angle can achieve the three-dimensional large angle measurement in a larger range, and has the characteristics of strong environmental light interference resistance, high resolution, high precision and compact structure.
Description
Technical field
The utility model belongs to the spatial angle measuring technical field, is specifically related to be used for the measurement mechanism of three dimensions wide-angle.
Background technology
The main metering system of angle measurement technique has mechanical type, electromagnetic type and optics angle-measuring method.The desk-top angle measurement accuracy with electromagnetism circle magnetic-grid-type of early stage classical mechanical tooth calibration is limited to, and is difficult to realize robotization; The optics angle-measuring method has noncontact, pinpoint accuracy and high sensitivity, and especially its advantage is more remarkable when using stable LASER Light Source.
At present; The optics angle-measuring method also has photoelectric encoder method, diffraction approach, autocollimation method, optical Fiber Method, acoustooptic modulation method, circle raster method, optics internal reflection method, laser interferance method, parallel interferogram technique and loop laser method etc. except that classical optics dividing head method and polygon method.Though these methods can provide higher measuring accuracy; But based on the optical system of this design, physical construction more complicated not only; And in the measuring system theoretical based on the optical imagery Fundamentals of Measurement; Because of receiving ambient light interference, spherical aberration and aberration etc. to influence measuring accuracy; And these optics angle-measuring methods mostly are confined to small angle range, space one dimension or two dimension angular during to spatial angle measuring under the prerequisite that guarantees measuring accuracy, so in the application of industry practice, have bigger limitation.Therefore, need angle measurement accuracy measurement mechanism high, that the angle measurement scope can be measured three-dimensional perspective more greatly simultaneously to satisfy requirement of engineering.
The utility model content
The purpose of the utility model is to provide a kind of measurement mechanism that is used for the three dimensions wide-angle, has the characteristics of strong anti-ambient light interference ability, high resolving power, high measurement accuracy and compact conformation.
A kind of measurement mechanism that is used for the three dimensions wide-angle comprises LASER Light Source, polaroid, unpolarized light splitting piece, polarization spectro sheet, rectangular raster, Conical Lenses, imageing sensor, photoelectric cell and digital information processing system;
The unpolarized light splitting piece of incident after the laser process polaroid transmission that LASER Light Source sends; After unpolarized light splitting piece laser light reflected enlarges the order of diffraction through rectangular raster, pass Conical Lenses and form the diffraction light-free spot; Imageing sensor is caught the diffraction light-free spot and is sent digital information processing system to, and digital information processing system calculates level boat angle and the angle of pitch of measurement to picture according to the diffraction light-free spot; Through the laser incident second polarization spectro sheet of unpolarized light splitting piece transmission, photoelectric cell is caught through the second polarization spectro sheet laser light reflected intensity I
1Laser intensity intensity I with transmission
2, and sending it to digital information processing system, digital information processing system is to I
1With I
2Ratio calculate the roll angle of measurement as inverse sine to picture.
Further, unpolarized light splitting piece and polarization spectro sheet are in angle of 45 degrees; Rectangular raster and unpolarized light splitting piece are in angle of 45 degrees; The baseplane of the photosurface of ccd image sensor, rectangular raster and Conical Lenses is parallel to each other; Symmetria bilateralis at the polarization spectro sheet is distributed with two photoelectric cells, and two photronic reception planes become 90 degree angles.
This method has following advantage:
Centering characteristic that 1 diffraction light-free is good and strong anti-ambient light interference ability have improved the centering precision of spot center, and the photronic light intensity linearity is very good, has guaranteed to install the measuring accuracy of the angle of pitch, pitch angle and roll angle with respect to the horizontal plane.
Theoretical based on polarisation of light property when 2 measurements owing to roll angle are, the measure theory scope of roll angle is 0 °～90 °; Utilize rectangular raster that measurement range is extended to original at least 3 times, the angle of pitch, incline measurement scope can reach at least ± and 40 °, the utility model has improved the measurement range of space angle greatly when guaranteeing measuring accuracy.
3 modes through full optics have realized the measurement to the space all angles, and its compact conformation, simple, are easy to Project Realization.
Description of drawings
Fig. 1 is the utility model example structure synoptic diagram;
The optical schematic diagram of Fig. 2 the utility model;
Fig. 3 rectangular raster enlarges the measurement range principle schematic;
Embodiment
Below in conjunction with accompanying drawing the utility model preferred embodiment is done further to specify.
As shown in Figure 1; Realize the required concrete device of this instance: transmissivity is that 75% unpolarized light splitting piece 3, transmittance are that 80% polaroid 2, transmittance are the photoelectric cell 4 and 5 of 50% polaroid 6, Conical Lenses 7, ccd image sensor 8, rectangular raster 9, two large photosensistive surfaces, and polaroid 2 is fixed on the laser instrument 1; Unpolarized light splitting piece 3 and 6 liang of planes of polarization spectro sheet are in angle of 45 degrees; Rectangular raster 9 and unpolarized light splitting piece 3 also become the plane included angle of 45 degree; Ccd image sensor 8 photosurfaces, rectangular raster 9 are parallel to each other with the baseplane of Conical Lenses 7; Two photoelectric cells 4 become 90 degree angles with 5 the plane of accepting, and are symmetrically distributed in the both sides of polarization spectro sheet 6.
The space three-dimensional measurement of angle principle of the utility model is as shown in Figure 2.It is that 75% light splitting piece 3 is divided into two-way that laser beam behind the collimation incides transmissivity via polaroid 2.By that Shu Guangqiang that forms of light splitting piece 3 reflection a little less than; To the rectangular raster 9 expansion orders of diffraction (Fig. 3 has provided rectangular raster expansion measurement range principle schematic); Via Conical Lenses 7; Produce the diffraction light-free spot; Catch by ccd image sensor 8,, just can correspond to angle surface level in and the pitch angle of the utility model device with respect to laser beam through to the calculating of diffraction light-free spot centre coordinate (wherein the computing method of spot center can with reference to " based on the diffraction light-free of annulus filtering fixed in an algorithm " literary composition).
That stronger road parallel laser of light splitting piece 3 light intensity is crossed in transmission, and to be transmitted through transmittance be behind 50% the polarization spectro sheet 6, and a part is received by photoelectric cell 4, and another part is received by photoelectric cell 5; The laser intensity that photoelectric cell 4,5 will shine on it converts corresponding electromotive force into, is respectively I
1, I
2According to light intensity and roll angle θ corresponding relationship I
2/ I
1=sin θ just can calculate its roll angle.
Based on diffraction light-free spot centre coordinate is to calculate through the image process method interpolation fitting to get; Receive ccd image sensor light intensity linearity operation interval to influence very little; And the interference performance of its strong anti-surround lighting of diffraction light-free, rectangular raster widen the angle measurement scope time also can guarantee the measuring accuracy at horizontal angle and angle of inclination; Photronic photosurface is big, and light intensity linearity working range is wide, and roll angle is measured corresponding light intensity and calculated simply, and not only measurement range is big to make roll angle, and measuring accuracy is high.
The foregoing description is the utility model preferred embodiment; This apparatus structure is compact, and each the space angle scope that can survey is up to 90 degree, and measuring accuracy reaches a millivolt degree; But unintelligible for this instance be the utility model unique selection; Be to realize the utility model through the relative angle that changes different assemblies under the utility model same idea, all belong to the protection category of the utility model.
Claims (2)
1. be used for the measurement mechanism of three dimensions wide-angle, it is characterized in that, comprise LASER Light Source, polaroid, unpolarized light splitting piece, polarization spectro sheet, rectangular raster, Conical Lenses, imageing sensor, photoelectric cell and digital information processing system;
The unpolarized light splitting piece of incident after the laser process polaroid transmission that LASER Light Source sends; After unpolarized light splitting piece laser light reflected enlarges the order of diffraction through rectangular raster, pass Conical Lenses and form the diffraction light-free spot; Imageing sensor is caught the diffraction light-free spot and is sent digital information processing system to, and digital information processing system calculates level boat angle and the angle of pitch of measurement to picture according to the diffraction light-free spot; Through the laser incident second polarization spectro sheet of unpolarized light splitting piece transmission, photoelectric cell is caught through the second polarization spectro sheet laser light reflected intensity I
1Laser intensity intensity I with transmission
2, and sending it to digital information processing system, digital information processing system is to I
1With I
2Ratio calculate the roll angle of measurement as inverse sine to picture.
2. the measurement mechanism that is used for the three dimensions wide-angle according to claim 1 is characterized in that, unpolarized light splitting piece and polarization spectro sheet are in angle of 45 degrees; Rectangular raster and unpolarized light splitting piece are in angle of 45 degrees; The baseplane of the photosurface of ccd image sensor, rectangular raster and Conical Lenses is parallel to each other; Symmetria bilateralis at the polarization spectro sheet is distributed with two photoelectric cells, and two photronic reception planes become 90 degree angles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204918654U CN202329611U (en) | 2011-12-01 | 2011-12-01 | Device for measuring three-dimensional large angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204918654U CN202329611U (en) | 2011-12-01 | 2011-12-01 | Device for measuring three-dimensional large angle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202329611U true CN202329611U (en) | 2012-07-11 |
Family
ID=46441591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204918654U Withdrawn - After Issue CN202329611U (en) | 2011-12-01 | 2011-12-01 | Device for measuring three-dimensional large angle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202329611U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528518A (en) * | 2013-10-18 | 2014-01-22 | 中国科学院西安光学精密机械研究所 | Flash frequency laser speckle three-dimensional target obtaining system and method |
-
2011
- 2011-12-01 CN CN2011204918654U patent/CN202329611U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528518A (en) * | 2013-10-18 | 2014-01-22 | 中国科学院西安光学精密机械研究所 | Flash frequency laser speckle three-dimensional target obtaining system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120711 Effective date of abandoning: 20130128 |
|
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |