It is applied to the Three Degree Of Freedom laser measurement system of plant equipment geometric error measurement
The invention belongs to accurate laser measurement technology, and in particular to a kind of to be applied to the three of the measurement of plant equipment geometric error
Degree of freedom laser measurement system.
With the development of modern processing and high-end equipment sophisticated manufacturing, the requirement on machining accuracy of Digit Control Machine Tool is got over
Come higher.The high accuracy precision machine tool for meeting Production requirement is assembled in order to produce, and makes lathe keep high-accuracy shape
State.Detection to lathe geometric error amount will become the problem that cannot avoid.The geometric error of lathe is detected only, could be really
Whether the lathe of product shy with strangers meets requirement, and the further machining accuracy of raising lathe, or the systematic error to existing lathe
In general, the process for debuging lathe needs to detect every geometric error, for debuging design accuracy.
Lathe dispatches from the factory to be needed to detect lathe global error, to confirm overall performance.During the use of lathe, need regular
The geometric error of lathe is detected, to guarantee that machine finish does not occur drift.It is several according to existing precision machine tool
What error-detecting means, can only once detect a margin of error, and for high-precision numerical control lathe, its margin of error will at least be detected
21, therefore, complete each margin of error for having detected lathe, required time are very tediously long, cause very considerable hidden
People attempt to solve this problem always, and have developed many measuring methods and technology.Sum up bag
Include：Traditional optical meanss, based on the method for diffraction of light, the method and laser interference based on laser traces and laser alignment phase
With reference to method.Wherein, based on laser interference and laser alignment be at present apply state-of-the-art method.
But existing detecting system bulky complex, laser interferometer cannot detect displacement and amount of spin, amount of spin simultaneously
If being detected by sensor PSD, it is impossible to accomplish to trace to the source, precision authority is low, and sensing head needs active device to carry out letter
Number transmission, its heating affect certainty of measurement.
The content of the invention
The technical problem to be solved is system complex, and measurement data can not be traced to the source, and active device heating is to surveying
Amount result is impacted, in order to overcome the above not enough, there is provided a kind of three freedom for being applied to the measurement of plant equipment geometric error
Degree laser measurement system.
In order to solve above-mentioned technical problem, the technical scheme is that：It is described to be applied to the survey of plant equipment geometric error
The Three Degree Of Freedom laser measurement system of amount includes light splitting microscope group, polarization spectro microscope group, moves reflective microscope group and fixed counter-mirror group,
Incident illumination is equally divided into incident parallel light but the first non-coplanar beamlet, the second beamlet and the 3rd by the light splitting microscope group
Beamlet, the polarization spectro microscope group are located in the light path of 3 beamlets, and each beamlet Jing polarization spectroscope components are reference
Light and measurement light, move reflective microscope group and are arranged in the light path of measurement light and are reflected back towards polarization spectro microscope group, and fixation is reflective
Microscope group is arranged in the light path of reference light and is reflected back towards polarization spectro microscope group, after the reference light being reflected back converges with measurement light
Formed and interfered, interference signal is used to calculate the Three Degree Of Freedom.
Further, arrange and orthogonal front parallelogram prism and rear parallel four before and after the light splitting microscope group includes
Side shape prism, four sides of each parallelogram prism are followed successively by the plane of incidence vertical with incident illumination and plane of incidence angle
For the light splitting surface of the acute angle reflecting surface relative with light splitting surface and the exit facet relative with the plane of incidence, rear parallelogram prism
The plane of incidence is relative with the light splitting surface of front parallelogram prism, the light splitting microscope group also include first three angle prism for arranging in front and back and
Vee formation prism, triangular prism hypotenuse place face are transmission plane, vertical with incident illumination for beamlet face, described first three angle prism
Transmission plane fit with the light splitting surface of front parallelogram prism, the beamlet face of first three angle prism and rear parallel four side
The plane of incidence of shape prism fits, and the transmission plane of Vee formation prism is fitted with the light splitting surface of rear parallelogram prism.
Further, the exit facet of the rear parallelogram prism and the Vee formation prism adjacent with the exit facet
Beamlet face, is fitted with the plane of incidence of the polarization spectro microscope group.
Further, parallelogram of the principal section of the parallelogram prism for 45 ° of pair of horns, the master of triangular prism
Section is isosceles right triangle.
Further, the light splitting surface of each parallelogram prism is provided with depolarization spectro-film, and the reflecting surface is provided with
High-reflecting film, other sides are provided with anti-reflective film.
Further, the splitting ratio of the depolarization spectro-film of the front parallelogram prism is 2:1, rear parallelogram rib
The splitting ratio of the depolarization spectro-film of mirror is 1:1.
Further, the light splitting surface plating High Extinction Ratio polarization beam splitter of the polarization spectro microscope group, remaining work surface plate anti-reflective
Further, the reflective microscope group of the motion includes 3 reflectors, and 3 reflectors are respectively positioned at the measurement of 3 beamlets
In the light path of light and it is reflected back polarization spectro microscope group, the fixed counter-mirror group structure is identical with reflective microscope group is moved, respectively position
In the light path of the reference light of 3 beamlets and it is reflected back polarization spectro microscope group.
Further, the plane of incidence coating anti reflection film of each reflector, reflecting surface plating depolarization reflectance coating.
Further, the reflector is prism of corner cube reflector.
The technical scheme that the present invention is provided is based on double-frequency laser interference, can measure 3 physical quantitys simultaneously, wherein 1 position
Shifting amount, 2 rotation amounts can greatly shorten detection time, improve detection efficiency, and its tractability is strong, and sensing head is
Passive device, will not introduce hot interference, it is not necessary to cable output signal, and then eliminate error caused by heat interference.Meanwhile, its pin
To specific demand, moderate cost, high precision, possess very strong application and market value, go for various complexity
Plant equipment, such as electromotor, excavator, electromotor, locomotive and Digit Control Machine Tool etc..
Description of the drawings
Fig. 1 is the structural representation of measuring system of the present invention；
Fig. 2 is the isolating construction figure of light splitting microscope group of the present invention；
Fig. 3 is the structural representation of the reflective microscope group of motion of the present invention；
Fig. 4 is light path process in measuring system test of the present invention；
Fig. 5 is the measuring method of present system Three Degree Of Freedom.
Shown in figure：
1- light splitting microscope groups, parallelogram prism before 11-, 111,111 '-plane of incidence, 112,112 '-light splitting surface, 113- are anti-
Penetrate face, 114,114 '-exit facet, parallelogram prism after 12-, 13- first three angle prism, 131,131 '-transmission plane, 132,
132 '-beamlet face, 14- Vee formation prisms；
2- polarization spectro microscope groups；
3- moves reflective microscope group, the first reflectors of 31-, the second reflectors of 32-, the 3rd reflectors of 33-；
4- fixed counter-mirror groups；
5- laser instrument, 51- incident illuminations, 52- beamlets, 521- primary optic axis, the second optical axises of 522-, the 3rd optical axises of 523-,
53- reference lighies, 54- measurement light；
6- bonders, 7- photoelectric accounters, 8- data processings and display device.
The present invention is described in detail below in conjunction with the accompanying drawings：
As shown in figure 1, the Three Degree Of Freedom laser measurement system for being applied to the measurement of plant equipment geometric error of the present invention
Including light splitting microscope group 1, polarization spectro microscope group 2, move reflective microscope group 3 and fixed counter-mirror group 4.
The optical path direction of incident illumination is X to X sets gradually light splitting microscope group, polarization spectro microscope group and motion illuminator upwards
Group, the fixed counter-mirror group are arranged in the Y-direction of polarization spectro microscope group.
As shown in Fig. 2 light splitting microscope group described in light splitting microscope group 1 includes front parallelogram prism 11, rear parallelogram rib
Mirror 12, first three angle prism 13 and Vee formation prism 14.
Front parallelogram prism 11 is identical with the structure of rear parallelogram prism 12, in the past parallelogram prism 11
As a example by.The principal section of the front parallelogram prism 11 for 45 ° of pair of horns parallelogram, its four sides be followed successively by with
X to the vertical plane of incidence 111, with the less light splitting surface 112 of 111 angle of the plane of incidence, and the relative reflecting surface 113 of light splitting surface 112
And the exit facet 114 relative with the plane of incidence 111.
First three angle prism 13 is identical with the structure of Vee formation prism 14, in the past as a example by triangular prism 13.The front triangle rib
The principal section of mirror 13 is isosceles right triangle, and hypotenuse place face is transmission plane 131, with X to vertical for beamlet face 132,
The transmission plane 131 of first three angle prism 13 is fitted with the light splitting surface 112 of front parallelogram prism 11, the front triangle rib
The beamlet face 132 of mirror 13 is fitted with the plane of incidence 111 ' of rear parallelogram prism 12, the Vee formation prism 14 it is saturating
The light splitting surface 112 ' that face 131 ' is penetrated with rear parallelogram prism 52 fits.
The front parallelogram prism 11 and rear parallelogram prism 12 are mutually perpendicular to, and rear parallelogram prism
The plane of incidence 111 ' it is relative with the light splitting surface 112 of front parallelogram prism.
The light splitting surface 112 and the coating splitting ratio of transmission plane 131 are 2:1 depolarization spectro-film, wherein 2/3 light intensity is saturating
Penetrate, 1/3 smooth strong reflection, light splitting surface 112 ' and the coating splitting ratio of transmission plane 131 ' are 1:1 depolarization spectro-film, half transmitting half are anti-
Penetrate, the coating HR high-reflecting films of the reflecting surface 113, other sides of prism coat AR anti-reflective films.
As shown in figure 1, in the rear parallelogram prism 12 exit facet 114 ' relative with the plane of incidence 111 ' and with this
The beamlet face 132 ' of the adjacent Vee formation prism 14 in face, is fitted with the plane of incidence of the polarization spectro microscope group 2, described
Polarization spectro microscope group 2 is PBS prisms, is made up of two triangular prisms, and High Extinction Ratio polarization spectro is plated in the middle of two triangular prisms
Film, remaining work surface plate AR anti-reflective films.
The modular construction adopted with fixed counter-mirror group 4 by the reflective microscope group of the motion 3 is identical with number of components, to move
As a example by reflective microscope group 3, as shown in figure 3, it include 3 corner cube prism reflectors be respectively the first reflector 31, and first reflection
Second reflector 32 arranged side by side of device 31 and overlay the 3rd reflector 33 above the first reflector 31, the plane of incidence of each reflector
Plating AR anti-reflective films, reflecting surface plating depolarization reflectance coating.
The fixed counter-mirror group 4 also includes three reflectors, in the same manner, the plane of incidence plating AR anti-reflective films of each reflector,
Reflecting surface plates depolarization reflectance coating.
As shown in figure 4, light path process is followed successively by test：The transmitting X of laser instrument 5 enters to cross-polarization double-frequency laser Shu Zuowei
Light 51 is penetrated, 51 Jing light splitting microscope group 1 of incident illumination is equally divided into three cross-polarization double frequency beamlets 52 parallel with incident illumination 51, had
Body is premenstrual parallelogram prism 11 and first three angle prism 13, and it is 2 that incident illumination 51 is divided into beam intensity ratio:1 two-beam.1/3 light
The first strong beamlet light 521 enter the light beam of 2,2/3 light intensity of polarization spectro microscope group enter rear parallelogram prism 12 and after
The light beam of 2/3 light intensity is further divided into beam intensity ratio for 1 by triangular prism 14:1 two beamlets, i.e. the second beamlet 522
With the 3rd beamlet 523.2 points of described each 52 Jing polarization spectros microscope group of beamlet is reference light 53 and measurement light 54, fixes anti-
Light microscope group 4 receives reference light 53 and is reflected back polarization spectro microscope group 2, moves reflective microscope group 2 and receives measurement light 54 and be reflected back partially
Shake light splitting microscope group 2, the reflected light of the reflected light and measurement light 54 of reference light 53 is incorporated to an optical interference circuit, and Jing bonders 6 are formed
Interference fringe, 7 pairs of the mobile of three groups of interference fringes count photoelectric accounter respectively, then Jing data processings and display device 8 are given
Go out X to displacement, Ry amounts of spin and Rz amounts of spin.
Specific data processing method is as follows：
As shown in figure 5, present system three equivalent measurements point a, b and c on testee, the first beamlet 521
The interference fringe of formation and the X of a points are to displacement XaIt is corresponding, the X of interference fringe and b points that the second beamlet 522 is formed to
Displacement XbCorresponding, the X of interference fringe and c points that the 3rd beamlet 523 is formed is to displacement XcIt is corresponding, the first beamlet
521 and second the centre-to-centre spacing between beamlet 522 be Ly, the centre-to-centre spacing between the first beamlet 521 and the 3rd beamlet 523 is
Lz.In order to preferably eliminate the impact of environmental error and vibration, X is respectively to displacement d, Ry amount of spin α and Rz amount of spin β：
It is pointed out that X can also be adopteda、XbAnd XcIn some value as X to displacement.