CN107036559A - A kind of measuring method of curved surface slope - Google Patents
A kind of measuring method of curved surface slope Download PDFInfo
- Publication number
- CN107036559A CN107036559A CN201710397923.9A CN201710397923A CN107036559A CN 107036559 A CN107036559 A CN 107036559A CN 201710397923 A CN201710397923 A CN 201710397923A CN 107036559 A CN107036559 A CN 107036559A
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- curved surface
- point
- ccd camera
- amici prism
- slope
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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
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a kind of measuring method of curved surface slope, measured using optical measuring head, the optical measuring head includes laser, aperture diaphragm, speculum, Amici prism, imaging len and CCD camera, the collimated light beam via hole diameter diaphragm that laser is sent shortens thin collimated optical beam into, incided after the reflected mirror of thin collimated optical beam in Amici prism, the reflected beams of 1/2 energy project any point on curved surface, after the light beam of the point reflection is transmitted through Amici prism, it is imaged on by imaging len in CCD camera, data processing module is according to the position of hot spot in CCD camera, calculate the slope information of the point on curved surface.The present invention, for the curved surface including plane, can measure the tangent slope at any point on curved surface using the principle of autocollimatic instrument, and the measurement of detection and various angles to freeform optics surface pattern has very big application space, and precision is high, and data are accurately and reliably.
Description
Technical field
The present invention relates to a kind of measuring method of curved surface slope.
Background technology
In machine tool error detection field, there are laser interferometer and club using relatively broad machine tool error detecting instrument
Instrument, due to the factor on itself Cleaning Principle, these instruments exist respective in the error-detecting applied to multi-axis NC Machine Tools
Deficiency：Such as laser interferometer adjustment complexity, one-shot measurement can only obtain a parameter, and operation requires high, it is difficult to which realization is automatically
Change, it is rapid and expensive, general enterprises do not possess；Ball bar can not random planning survey path, for rotation axis error
The measuring process design of identification and theoretical decoupling algorithm research add difficulty, and ball bar coordinates precision ball to carry out with magnet base
Contact type measurement, it is necessary to move to ensure measurement accuracy, it is difficult to adapt to rapid trend under the low speed.One dimension spherical column is adapted to each axle
Straight line demarcation, but do not have advantage to angle error-detecting, and the relative error between each axle of gang tool is to machining accuracy shadow
Sound is very big.
For the processing of complicated abnormal shape part, the characteristics of multiaxis NC maching technology relies on its flexible, efficient, high-precision obtains
Extensive use and popularization, the need for meeting regular precision calibration, efficient machine tool error detection just turns into discrimination method
Urgent problem to be solved.
The geometric error detection project of multi-axis NC Machine Tools mainly includes the angular error, position error, straight line of kinematic axis
Error, error of perpendicularity etc. are spent, in order to detect the above-mentioned margin of error of kinematic axis, it is proposed that a kind of error based on primary standard of curved surface part
Detection method, needs to detect the slope of each point on different faces type standard in this way, although collimator system can be right
Angle is measured, but own beam spot diameter is very big, for the tangent slope at any point on measurement curved surface, light
The smaller result measured of spot diameter is closer to actual spot of measurement, it is therefore desirable to detect exploitation for the tangent slope of each point on curved surface
A kind of measuring method of curved surface slope.
The content of the invention
The present invention provides a kind of measuring method of curved surface slope to solve technical problem present in known technology, uses
This method can measure the tangent slope of each point on curved surface.
The present invention is adopted the technical scheme that to solve technical problem present in known technology：A kind of curved surface slope
Measuring method, is measured using optical measuring head, and the optical measuring head includes laser, aperture diaphragm, speculum, light splitting rib
Mirror, imaging len and CCD camera, the collimated light beam that the laser is sent shorten thin collimated optical beam into through the aperture diaphragm, thin straight
Light beam is incided after the speculum in the Amici prism, and the reflected beams of 1/2 energy project any one on curved surface
Point, after the light beam of the point reflection is transmitted through the Amici prism, is imaged in the CCD camera by the imaging len；Adopt
The method measured with the optical measuring head is：According to the position of hot spot in the CCD camera, the oblique of the point on curved surface is calculated
Rate information：ξx=arctan (sox/ f)/2, ξy=arctan (soy/ f)/2, wherein：ξxMeasurement point A is represented in XOZ planes
The angle of tangent line and X-direction；ξyRepresent the angle of tangent lines and Y direction of the measurement point A in YOZ planes；S0xRepresent imaging
Distance of the hot spot A ' center in X-direction system of distance optical axis；S0yThe center for representing imaging facula A ' is in Y direction distance
The distance of system optical axis, f represents the focal length of imaging len.
The present invention has the advantages and positive effects of：Using the principle of autocollimatic instrument, for the curved surface including plane,
The tangent slope at any point on curved surface can be measured, the measurement of detection and various angles to freeform optics surface pattern has very
Big application space, and precision is high, and data are accurately and reliably.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is light path principle figure of the invention.
In figure：1st, laser；2nd, aperture diaphragm；3rd, speculum；4th, Amici prism；5th, imaging len；6th, CCD camera.
Embodiment
In order to further understand the content, features and effects of the present invention, hereby enumerating following examples, and coordinate accompanying drawing
Describe in detail as follows：
Referring to Fig. 1, a kind of measuring method of curved surface slope, is measured using optical measuring head, the optical measuring head bag
Include laser 1, aperture diaphragm 2, speculum 3, Amici prism 4, imaging len 5 and CCD camera 6.The standard that the laser 1 is sent
Collimated optical beam shortens thin collimated optical beam into through the aperture diaphragm 2, and thin collimated optical beam incides the Amici prism 4 after the speculum 3
In, the reflected beams of 1/2 energy project any point on curved surface, and the light beam of the point reflection is transmitted through the Amici prism 4
Afterwards, it is imaged on by the imaging len 5 in the CCD camera 6.
Use the method that the optical measuring head is measured for：According to the position of imaging facula in the CCD camera 6, meter
Calculate the slope information of the point on curved surface：ξx=arctan (sox/ f)/2, ξy=arctan (soy/ f)/2, wherein：ξxRepresent measurement
The angle of tangent lines and X-direction of the point A in XOZ planes；ξyRepresent tangent lines and Y direction of the measurement point A in YOZ planes
Angle；S0xImaging facula A ' distance of the center in X-direction system of distance optical axis is represented, optical axis and imaging facula are in CCD phases
Pixel coordinate in machine can be measured by data processing module to be obtained, and passes through the corresponding size of pixel in CCD camera, Jin Erke
So that the pixel coordinate of X-direction is converted into displacement S0x；S0yImaging facula A ' center is represented in Y direction system of distance
The pixel coordinate of the distance of optical axis, optical axis and imaging facula in CCD camera can be measured by data processing module and obtained, and be led to
The corresponding size of pixel in CCD camera is crossed, and then the pixel coordinate of Y direction can be converted to displacement S0y；F represents imaging
The focal length of lens.
The present invention operation principle be：
Fig. 2 is referred to, when light beam projects any point on curved surface, because the curvature of each point is different, therefore different measurement points
Imaging facula position in CCD camera is different, i.e., the position of each point tangent slope and imaging facula in CCD camera on curved surface
There is one-to-one relation, the slope at any point on curved surface can be obtained according to the position of imaging facula in CCD camera.
Illustrated by taking XOZ planes as an example：
Wherein：ξxRepresent the angle of tangent lines and X-direction of the measurement point A in XOZ planes；
S0xRepresent imaging facula A ' distance of the center in X-direction system of distance optical axis；
F represents the focal length of imaging len.
It can be obtained by formula (1)：
ξx=arctan (sox/f)/2
It can similarly obtain：
ξy=arctan (soy/f)/2
Therefore the information of slope of any point in XOZ and YOZ planes on curved surface can be obtained.
Although the preferred embodiments of the present invention are described above in conjunction with accompanying drawing, the invention is not limited in upper
The embodiment stated, above-mentioned embodiment is only schematical, be not it is restricted, this area it is common
Technical staff is under the enlightenment of the present invention, in the case where not departing from present inventive concept and scope of the claimed protection, also
Many forms can be made, these are belonged within protection scope of the present invention.
Claims (1)
1. a kind of measuring method of curved surface slope, it is characterised in that measured using optical measuring head, the optical measuring head includes
Laser, aperture diaphragm, speculum, Amici prism, imaging len and CCD camera, the collimated light beam warp that the laser is sent
The aperture diaphragm shortens thin collimated optical beam into, and thin collimated optical beam is incided after the speculum in the Amici prism, 1/2 energy
The reflected beams project any point on curved surface, after the light beam of the point reflection is transmitted through the Amici prism, by it is described into
As lens imaging is in the CCD camera；
Use the method that the optical measuring head is measured for：According to the position of hot spot in the CCD camera, calculating should on curved surface
The slope information of point：
ξx=arctan (sox/ f)/2,
ξy=arctan (soy/ f)/2,
Wherein：ξxRepresent the angle of tangent line and X-direction of the measurement point in XOZ planes；
ξyRepresent the angle of tangent line and Y direction of the measurement point in YOZ planes；
S0xRepresent distance of the center in X-direction system of distance optical axis of imaging facula；
S0yRepresent distance of the center in Y direction system of distance optical axis of imaging facula；
F represents the focal length of imaging len.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710397923.9A CN107036559A (en) | 2017-05-31 | 2017-05-31 | A kind of measuring method of curved surface slope |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710397923.9A CN107036559A (en) | 2017-05-31 | 2017-05-31 | A kind of measuring method of curved surface slope |
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| Publication Number | Publication Date |
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| CN107036559A true CN107036559A (en) | 2017-08-11 |
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| CN201710397923.9A Pending CN107036559A (en) | 2017-05-31 | 2017-05-31 | A kind of measuring method of curved surface slope |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107702664A (en) * | 2017-10-24 | 2018-02-16 | 北京信息科技大学 | A kind of reflective system for detecting verticality and method based on semiconductor laser alignment |
| CN110887452A (en) * | 2019-12-05 | 2020-03-17 | 中国人民解放军国防科技大学 | Method for measuring surface inclination angle of target position of curved surface object |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4213909A1 (en) * | 1992-04-28 | 1993-11-04 | Mtu Muenchen Gmbh | DEVICE FOR MEASURING EDGE PROFILES FROM EDGES |
| US20020146165A1 (en) * | 2000-12-28 | 2002-10-10 | Tilo Lilienblum | Method of defining deviations of pixel positions |
| CN104296687A (en) * | 2014-11-05 | 2015-01-21 | 哈尔滨工业大学 | Smooth large-curvature sample measurement device and method based on fluorescent confocal microscopy |
| CN106225715A (en) * | 2016-08-02 | 2016-12-14 | 中国科学院长春光学精密机械与物理研究所 | A kind of pentaprism scanning detection method for non-spherical reflector |
-
2017
- 2017-05-31 CN CN201710397923.9A patent/CN107036559A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4213909A1 (en) * | 1992-04-28 | 1993-11-04 | Mtu Muenchen Gmbh | DEVICE FOR MEASURING EDGE PROFILES FROM EDGES |
| US20020146165A1 (en) * | 2000-12-28 | 2002-10-10 | Tilo Lilienblum | Method of defining deviations of pixel positions |
| CN104296687A (en) * | 2014-11-05 | 2015-01-21 | 哈尔滨工业大学 | Smooth large-curvature sample measurement device and method based on fluorescent confocal microscopy |
| CN106225715A (en) * | 2016-08-02 | 2016-12-14 | 中国科学院长春光学精密机械与物理研究所 | A kind of pentaprism scanning detection method for non-spherical reflector |
Non-Patent Citations (1)
| Title |
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| 房丰洲等: "基于光学自由曲面的三维位移测量系统", 《天津大学学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107702664A (en) * | 2017-10-24 | 2018-02-16 | 北京信息科技大学 | A kind of reflective system for detecting verticality and method based on semiconductor laser alignment |
| CN110887452A (en) * | 2019-12-05 | 2020-03-17 | 中国人民解放军国防科技大学 | Method for measuring surface inclination angle of target position of curved surface object |
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Application publication date: 20170811 |