CN1920478A - Method and device for improving straight line degree measurement sensitivity - Google Patents
Method and device for improving straight line degree measurement sensitivity Download PDFInfo
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- CN1920478A CN1920478A CN 200610088886 CN200610088886A CN1920478A CN 1920478 A CN1920478 A CN 1920478A CN 200610088886 CN200610088886 CN 200610088886 CN 200610088886 A CN200610088886 A CN 200610088886A CN 1920478 A CN1920478 A CN 1920478A
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Abstract
The invention relates to a method for improving the sensitivity of linearity test, and a relative device, wherein it is a laser testing system formed by fixed unit, movable unit and computer; it comprises laser emitter, deviation splitter, lambada/4 wave plate, reflector, photoelectric receiver and signal processor. The optical element sets the testing light to pass the movable target mirror several times, to magnify its testing sensitivity several times; and it sets lens group before the detector, to magnify the sensitivity more. The invention can test two-dimension linearity of straight track real time.
Description
Technical field
The invention belongs to photoelectric detection technology field, when being specially adapted to workpiece or object, to the two-dimentional straightness error of its motion or a kind of method and apparatus that improves straight line degree measurement sensitivity that the shaped position error (as linearity, right alignment etc.) of large-scale workpiece is measured along certain guide rail movement.
Background technology
Straight line degree measurement is common and important measurement project in the machining, and it mainly comprises to the measurement of workpiece real surface straightness error and to line slideway or from the measurement of normal moveout correction straight-line motion mechanism straightness error.Adopt two-frequency laser interferometer can better realize high Precision Detection to moving component displacement of the lines sum of errors angular displacement error, but instrument costs an arm and a leg, it is higher to measure cost, and is that one-parameter is measured, and is difficult to satisfy all users' needs.Chinese patent 02285917.9 has proposed the method that a kind of based semiconductor laser, single-mode fiber assembly are measured two-dimentional linearity simultaneously.But this method is difficult to satisfy the requirement of high precision, superhigh precision.
Summary of the invention
The purpose of this invention is to provide a kind of method and apparatus that improves straight line degree measurement sensitivity.The measurement mechanism of described raising straight line degree measurement sensitivity is the laser measurement system of being made up of fixed cell 100, mobile unit 200 and output and display unit 300 3 parts, it is characterized in that, the magnetic tape trailer optical fiber semiconductor laser transmitter 1 of fixed cell 100, single-mode fiber 2, collimation lens 3, polarisation optical splitter 4,
λ/4The reverberator 11 of wave plate 5 and mobile unit is placed on the optical axis of emission light light path; On the reflected light optical axis, place reverberator 6 below the polarisation optical splitter 4, below single-mode fiber 2, place plane mirror 7, lens combination 8 and photodetector 9 from the top down, driving is connected with magnetic tape trailer optical fiber semiconductor laser transmitter 1, photodetector 9 and computing machine 12 respectively with signal processor 10.
Said mobile unit is a retro-reflector, or adopts a plurality of reverberators, and measurement sensitivity is further improved; And fix by support.
A plurality of reverberators are prism of corner cube or opal in the described mobile unit.
Said
λ/4The fast axle of wave plate is at 45 with the polarization direction of linearly polarized light, and light passes through for four times
λ/4Wave plate.
Said
λ/4Wave plate is used
λ/2When wave plate replaces, and make its fast axle at 45, and allow light pass through for 2 times with the polarization direction of linearly polarized light.
Said lens combination is made up of two different convex lens of focal length, and places pin hole filtering on common focal plane.
Utilize in the described fixed cell polarization spectroscope 4 in reflector element 14 alternative of forming by retro-reflector and catoptron one,
λ/4 Wave plate 5 and reverberator 6 make it to measure sensitivity and are amplified to the effect the same with embodiment one, thereby save optical component more.
The photelectric receiver 9 of said straightness error signal can adopt four-quadrant photelectric receiver, PSD position sensitive device or CCD photelectric receiver.
Measuring principle of the present invention and measuring method are: the semiconductor laser 1 emission high stable laser beam by band optical fiber, incide polarizing beam splitter 4, and this incident light becomes linearly polarized light through polarizing beam splitter 4.This linearly polarized light process
λ/4Behind the wave plate 5, become the circular polarization polarized light.After inciding mobile unit 200 reflections, pass through again
λ/4Behind the wave plate 5, become linearly polarized light by circularly polarized light again, but its polarization direction 90 ° of angles have been rotated.Reflex to another reverberator 6 through polarizing beam splitter 4, make light once more along the reverberator 11 of original direction by a mobile unit.Light passes through for four times altogether
λ/4Behind the wave plate, its polarization direction is got back to initial polarization state again, sees through polarizing beam splitter 4, incides plane mirror 7, scioptics group 8, incide on the photodetector 9, and photodetector (U.S. Edmund Optics company model is the CCD of NT53-007) receives thus.When mobile unit 200 when guide rail moves, because of the error of guide rail, must cause the displacement of light reflector at corresponding both direction at the both direction linearity.Because incident ray is motionless, the light reflector of mobile unit must cause its reflection ray position change on corresponding both direction in the displacement of both direction, the change amount of this light position is directly detected by the photelectric receiver that receives this reflection ray, and obtains two-dimentional straightness error through signal processing circuit.
The present invention compares the characteristics that had with background technology:
One, incident ray make light repeatedly by the reverberator of mobile unit through polarisation optical splitter, wave plate and another reverberator, make it measure sensitivity and are multiplied, and promptly light passes through mobile unit N time, and sensitivity is increased to 2N doubly;
Two, before photodetector, adopt lens combination, and select suitable parameters, can further improve the sensitivity of measurement, in lens combination, adopt pin hole filtering simultaneously, increase system's antijamming capability and stability;
Three, no cable connects on the mobile unit, and in-site measurement is very convenient.Apparatus structure is simple, volume is little, and installation, easy to adjust can obtain high measuring accuracy, the static state of applicable straightness error and kinetic measurement.The technical matters that solves is: a kind of simple laser linearity measuring system is provided, realizes the straightness error of both direction is measured simultaneously.Realize the amplification of straightness error more than 8 times, thereby improve systematic survey sensitivity greatly.The traverse measurement head of measuring system does not have cable and connects, and has that volume is little, in light weight, the measuring accuracy advantages of higher.
Description of drawings
Fig. 1 improves the embodiment schematic diagram that the linearity degree is measured sensitivity.
2 reverberators by mobile unit of Fig. 2 light improve the schematic diagram of measuring sensitivity.
Fig. 3 rays pass through lens group improves the schematic diagram of measuring sensitivity once more.
Fig. 4 light 4 secondary reflections improve the schematic diagram of measuring sensitivity.
Fig. 5 light 4 secondary reflections improve the another kind of mode schematic diagram of measuring sensitivity.
Fig. 6 embodiment four schematic diagrams
Fig. 7 embodiment five schematic diagrams
Fig. 8 embodiment six schematic diagrams
It is NI-1405 or Bandit II-EO data processing module that the driving of detector C CD and signal processor are selected model for use.
Among the figure: 1 is semiconductor laser transmitter, and 2 is single mode light, and 3 is collimation lens, 4 is polarizing beam splitter, and 5 is λ/4 wave plates, and 6,11,13 is retro-reflector, 7 is plane mirror, and 8 is lens combination, and 9 is photodetector, 10 for driving and signal processor, 12 is computing machine, 14 reflector elements (forming) by retro-reflector and catoptron, and 100 is fixed cell, 200 is mobile unit, and 300 are output and display unit.
Embodiment
The invention provides a kind of method and apparatus that improves straight line degree measurement sensitivity.The measurement mechanism of described raising straight line degree measurement sensitivity is the laser measurement system of being made up of fixed cell 100, mobile unit 200 and output and display unit 300 3 parts.Contrast accompanying drawing below, illustrate and realize embodiments of the invention: a kind of raising straight line degree measurement sensitivity system comprises: generating laser, polarisation optical splitter, λ/4 wave plates, reverberator, photoelectricity receiving element and signal Processing.
Embodiment one (as shown in Figure 1):
High sensitivity measuring straightness error system in the system is by the 1 emission high stable laser beam of the semiconductor laser in the fixed cell 100, behind single-mode fiber 2, collimation lens 3 collimations, incide polarizing beam splitter 4, this incident light becomes linearly polarized light through polarizing beam splitter 4.This linearly polarized light process
λ/4Behind the wave plate 5, become the circular polarization polarized light.After inciding prism of corner cube 11 reflections in the mobile unit 200, pass through again
λ/4Behind the wave plate, become linearly polarized light by circularly polarized light again, but its polarization direction 90 ° of angles have been rotated.Reflex to another reverberator 6 through polarizing beam splitter, make light once more along the prism of corner cube 11 of original direction by a mobile unit.Be light four times altogether
λ/4Behind the wave plate 5, but its polarization direction is got back to initial polarization state again, sees through polarizing beam splitter 4, incides plane mirror 7, scioptics group 8, incide on the detector 9, and photelectric receiver receives thus.When mobile unit 200 when line slideway moves, if guide rail, must cause the displacement of light reflector at corresponding both direction at the both direction straightness error.Because incident ray is motionless, the light reflector of mobile unit must cause its reflection ray position change on corresponding both direction in the displacement of both direction, the change amount of this light position directly by the photelectric receiver that receives this reflection ray survey 9 to, and obtain two-dimentional straightness error through signal processing circuit.Can get by the geometrical optics knowledge among Fig. 2, when mobile unit has on perpendicular to the guide rail direction
ΔDuring translation, prism of corner cube 11 reflections in twice process of its reflection ray mobile unit 200 have the light through polarizing beam splitter 4
4 ΔsTranslation, promptly
δ
x＝4Δ
x；δ
y＝4Δ
y (1)
In the formula
Δ x,
Δ yBe respectively level and the vertical straightness error of prism of corner cube 11 on vertical light incident direction in the mobile unit; δ
x, δ
yBe respectively that reflection ray sees through behind the polarizing beam splitter 4 translation in the horizontal and vertical directions.As shown in Figure 3, lens L in lens combination 8
1, L
2Focal length be respectively f
1, f
2, and incident ray is when having the d translation, and the translation D of emergent ray is:
D＝df
2/f
1 (2)
Be to obtain the luminous point translation on the detector 9 to be:
X＝δ
xf
2/f
1＝4Δ
xf
2/f
1；Y＝δ
yf
2/f
1＝4Δ
yf
2/f
1 (3)
Then level and vertical direction straightness error are respectively:
Δ
x＝Xf
1/(4f
2)；Δ
y＝Yf
1/(4f
2) (4)
If lens L
1, L
2Focal distance ratio be 0.5, the resolution of detector is 0.1um, it is 12.5nm that substitution formula (4) can obtain system two dimension straight line degree measurement resolution.Signal is finished the two-dimentional linearity signal that detector 9 is detected through treatment circuit 10 and is gathered, handles, passes through and computing machine 12 communications output and demonstration.Can also on the focal plane in the lens combination 8, increase a small filter, improve the precision of measuring.In addition, in surveying process,, should reduce the distance between incident light and the reflected light in order to reduce the influence of roll angle as far as possible to measuring as far as possible.
Embodiment two (as shown in Figure 4):
Be with the difference of embodiment one: increased a reverberator 11 in the mobile unit 200, and in fixed cell corresponding cover polarizing beam splitter 4, λ/4 wave plates 5, reverberator 6 and the reverberator 13 that increased.The measurement sensitivity of system is doubled on the basis of embodiment one once more.
Embodiment three (as shown in Figure 5):
Be with the difference of embodiment one: utilize a reflector element 14 (forming) by retro-reflector and catoptron, make the measurement light path pass through the running target mirror four times, reach the sensitivity multiplication effect same with embodiment two, different with mode two is to make system architecture more compact.
Embodiment four (as shown in Figure 6):
And the difference of embodiment one is: the lens combination 8 in the fixed cell is placed on the light path between polarizing beam splitter and the reverberator 6, make the effect that reaches same, different is that the diameter of the light that incides mobile unit is for the second time increased, and can reduce the influence of air turbulence to measuring.
Embodiment five (as shown in Figure 7):
And the difference of embodiment one is: the lens combination 8 in the fixed cell is placed on the light path between reverberator 11 and λ/4 wave plates 5, makes twice scioptics group 8 of measuring light, and the measurement sensitivity of system is improved on the basis of embodiment one once more.But the light diameter also is exaggerated for twice, therefore must consider the size of detector.
Embodiment six (as shown in Figure 8):
Be with the difference of embodiment one: in fixed cell, utilize polarization spectroscope 4, λ/4 wave plates 5 and reverberator 6 in reflector element 14 (forming) alternative one by retro-reflector and catoptron, make it to measure sensitivity and be amplified to the effect the same, thereby save optical component more with embodiment one.
Claims (9)
1. measurement mechanism that improves straight line degree measurement sensitivity, the measurement mechanism of described raising straight line degree measurement sensitivity is the laser measurement system of being made up of fixed cell (100), mobile unit (200) and computer system (300) three parts, it is characterized in that the inverse time device (11) of the magnetic tape trailer optical fiber semiconductor laser transmitter (1) of fixed cell (100), single-mode fiber (2), collimation lens (3), polarisation optical splitter (4), λ/4 wave plates (5) and mobile unit is placed on the optical axis of emission light light path; On the reflected light optical axis, below polarisation optical splitter (4), place reverberator (6), below single-mode fiber (2), place plane mirror (7), lens combination (8) and photodetector (9) from the top down, driving is connected with magnetic tape trailer optical fiber semiconductor laser transmitter (1), photodetector (9) and computing machine (12) respectively with signal processor (10).
2. according to the measurement mechanism of the described raising straight line degree measurement sensitivity of claim 1, it is characterized in that said mobile unit is a retro-reflector, or adopts a plurality of reverberators, measurement sensitivity is further improved; And fix by support.
3. according to the measurement mechanism of the described raising straight line degree measurement sensitivity of claim 2, it is characterized in that a plurality of reverberators are prism of corner cube or opal in the described mobile unit.
4. according to the measurement mechanism of the described raising straight line degree measurement sensitivity of claim 1, it is characterized in that the fast axle of said λ/4 wave plates is at 45 with the polarization direction of linearly polarized light, light passes through λ/4 wave plates four times.
5. according to the measurement mechanism of claim 1 or 4 described raising straight line degree measurement sensitivities, it is characterized in that, when said λ/4 wave plates replace with λ/2 wave plates, and make fast axle at 45, and allow light pass through for 2 times with the polarization direction of linearly polarized light.
6. according to the measurement mechanism of the described raising straight line degree measurement sensitivity of claim 1, it is characterized in that said lens combination is made up of two different convex lens of focal length, and on common focal plane, place pin hole filtering.
7. according to the measurement mechanism of the described raising straight line degree measurement sensitivity of claim 1, it is characterized in that, utilize polarization spectroscope (4), λ/4 wave plates (5) and reverberator (6) in reflector element (14) alternative of forming by retro-reflector and catoptron one in the described fixed cell, make it to measure sensitivity and be amplified to the effect the same, thereby save optical component more with embodiment one.
8. according to the measurement mechanism of the described raising straight line degree measurement sensitivity of claim 1, it is characterized in that the photodetector (9) of said reception straightness error signal adopts four-quadrant photelectric receiver, PSD position sensitive device or CCD photelectric receiver.
9. method that improves straight line degree measurement sensitivity, it is characterized in that, described measuring method is: by semiconductor laser (1) the emission high stable laser beam of band optical fiber, incide polarizing beam splitter (4), this incident light becomes linearly polarized light through polarizing beam splitter (4), this linearly polarized light becomes the circular polarization polarized light through behind λ/4 wave plates (5); After inciding mobile unit (200) reflection, after passing through λ/4 wave plates (5) again, become linearly polarized light by circularly polarized light again, but its polarization direction has rotated 90 ° of angles, reflex to another reverberator (6) through polarizing beam splitter (4), make light once more along the reverberator (11) of original direction by a mobile unit, after light passes through λ/4 wave plates four times altogether, its polarization direction is got back to initial polarization state again, see through polarizing beam splitter (4), incide plane mirror (7), scioptics group (8), incide on the photodetector (9), and photodetector receives thus, when mobile unit (200) when guide rail moves, because of the error of guide rail at the both direction linearity, must cause the displacement of light reflector at corresponding both direction, light is position change on corresponding both direction, and the change amount of this light position is directly detected by the photelectric receiver that receives this reflection ray, and obtains two-dimentional straightness error through signal processing circuit.
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