CN103499283A - Linear displacement laser interferometer calibration method and device based on two standard optical axes - Google Patents
Linear displacement laser interferometer calibration method and device based on two standard optical axes Download PDFInfo
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- CN103499283A CN103499283A CN201310475536.4A CN201310475536A CN103499283A CN 103499283 A CN103499283 A CN 103499283A CN 201310475536 A CN201310475536 A CN 201310475536A CN 103499283 A CN103499283 A CN 103499283A
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Abstract
The invention provides a linear displacement laser interferometer calibration method and a linear displacement laser interferometer calibration device based on two standard optical axes, and belongs to the technical field of laser measurement. A measuring light beam of a laser interferometer to be calibrated passes through a middle through hole of a two-axis hollow laser interference mirror group, and is parallelly arranged in the center position of two parallel standard measuring light beams; in a plane vertical to the two standard measuring light beams, in a line segment region formed by the two standard measuring light beams at the plane projection points, the differences of environment interference degrees of the two standard measuring light beams and the measuring light beam of the laser interferometer to be calibrated are very small, and the air refractive index average value of the two standard measuring light beams is approximate to the air refractive index value of the measuring light beam of the laser interferometer to be calibrated.
Description
Technical field
The invention belongs to the laser measuring technique field, relate generally to a kind of laser interferometer calibration steps and device.
Background technology
Laser interferometry displacement of the lines technology is the canonical measure technology that precision is very high, be widely used in the accurate and fields such as ultraprecise machining, microelectronics equipment, nanometer technology industrial equipment and defence equipment, in order to guarantee the accuracy of laser interferometer measurement displacement of the lines, need scientific and effective displacement of the lines laser interferometer calibration steps and device.The general thinking of lubber-line displacement lasers interferometer is to adopt the higher displacement of the lines laser interferometer of accuracy class to calibrate, and when both precision is close, is called comparison.In actual alignment work, the displacement of the lines laser interferometer has suitable precision mostly, thereby the calibration of displacement of the lines laser interferometer is realized by comparison.At present, the general calibration steps of displacement of the lines laser interferometer has parallel type, formula and light path formula (Liao Chengqing face-to-face altogether, Zhu little Ping, Wang Weichen, Du Hua. the research of laser interferometer length measurement precision calibration steps. modern surveying and laboratory room managing, 2005,1:6-7).
Fig. 1 is parallel type laser interferometer calibrating installation structural representation, canonical measure mirror and be calibrated and measure mirror and be arranged on same movable platform, and when sports platform moves, the light paths of two cover laser interferometer measurement light beams increase simultaneously and reduce.Because two cover laser interferometer are parallel, place, two-way light is affected by environment similar, and air refraction is less to the two-way influence of light, but, because the vertical range between two-way light is larger, when therefore two cover laser interferometer are calibrated, Abbe error is larger.
Fig. 2 is face-to-face formula laser interferometer calibrating installation structural representation, canonical measure mirror and being calibrated measures that mirror is aspectant to be arranged on sports platform, its advantage is that two cover laser interferometer measurement beam axis can tune to almost on same measurement axis, both Abbe errors are very little, shortcoming is that the near-end due to an interferometer is another far-end, both light paths do not wait, and are subject to the interference difference of environment, and air refraction is inconsistent on the light path impact of two cover laser interferometer.
2011, China National Measuring Science Research Inst. sets up domestic first 80 meters big-length laser interfering meter measuring devices (cold beautiful state, Tao Lei, Xu Jian. two-frequency laser interferometer system accuracy and analysis of Influential Factors based on the 80m measurement mechanism. metering and measuring technology, 2011, 38 (9): 47-49), the accepted standard device is that the length of three Agilent5530 types is put apart from two-frequency laser interferometer is parallel, become three path laser interferometers, the laser interferometer be calibrated is placed in the middle of them, thereby calibration, this scheme belongs to the derivative schemes of parallel type calibration steps, and measure owing to adopting three road light simultaneously, therefore the Abbe error in the time of can compensating measure, but put owing to being that three laser instruments are parallel, therefore three road sign locating tab assembly light locus are far away, the every road sign locating tab assembly of the measurement electrical distance electrical distance that is calibrated laser interferometer is also far away, all optical paths are subject to the difference that affects of environment, air refraction is inconsistent on all optical path impacts, cause the calibration measurement result inaccurate.
Fig. 3 is common light path formula laser interferometer calibrating installation structural representation, and altogether the light path formula is different from parallel type laser interferometer calibrating installation is that two laser instruments become the 90 degree mode of turning back with receiver, and two cover laser interferometer share interference mirror group and measurement mirror.Because two cover laser interferometer share an interference mirror group and measure mirror, can't determine shared interference mirror group and measure mirror and belong to the standard laser interferometer component or belong to and be calibrated the standard laser interferometer component, therefore, not that on accurate meaning, two calibrations of overlapping laser interferometer are calibrated.
1985, Dr-Ing H.-H.Schussler takes full advantage of space distribution (Dr-Ing H.-H.Schussler.Comparison and calibration of laser interferometer systems.Measurement, 1985,3 (4): 175-184), multipair displacement of the lines laser interferometer is carried out to common light path calibration.Owing to just increasing the quantity of light path laser interferometer altogether, so the method also has the shortcoming of light path formula laser interferometer calibrating installation altogether above-mentioned.
Summary of the invention
For Abbe error larger in above-mentioned existing displacement of the lines laser interferometer calibrating installation, serious air refraction inconsistency be not the problem that on accurate meaning, two cover laser interferometer are calibrated, the present invention proposes and has researched and developed displacement of the lines laser interferometer calibration steps and the device based on two Standard shafts, this invention makes the canonical measure light beam and is calibrated laser interferometer measurement light beam vertical range very little, thereby can reduce Abbe error, reduce the impact of air refraction inconsistency, and be that on accurate meaning, two cover laser interferometer are calibrated.
Purpose of the present invention is achieved through the following technical solutions:
A kind of displacement of the lines laser interferometer calibration steps based on two Standard shafts, the method step is as follows:
(1) the output light of standard laser interferometer laser instrument forms two canonical measure light beams that are parallel to each other through twin shaft hollow laser interference mirror group, article two, the canonical measure light beam incides on the level crossing of interstitial hole, after being reflected back toward twin shaft hollow laser interference mirror group with the part light of level crossing displacement information in every canonical measure light beam, according to from twin shaft hollow laser interference mirror group, obtain with two canonical measure light beams corresponding two interference signals respectively, can obtain two shift values that the level crossing of interstitial hole moves along the canonical measure beam direction;
(2) the output light that is calibrated the laser interferometer laser instrument forms and is calibrated the laser interferometer measurement light beam through being calibrated laser interferometer interference mirror group, be calibrated the intermediate throughholes of laser interferometer measurement light beam through twin shaft hollow laser interference mirror group, parallel and coplanar with two canonical measure light beams, being calibrated the laser interferometer measurement light beam incides and is calibrated on the laser interferometer catoptron, after being reflected back toward and being calibrated laser interferometer interference mirror group, according to the interference signal obtained from be calibrated laser interferometer interference mirror group, can obtain being calibrated the shift value that the laser interferometer catoptron moves along the canonical measure beam direction,
(3) at sports platform along in canonical measure beam direction to-and-fro movement process, with at the uniform velocity or non-at the uniform velocity sampling rate, two of synchronized sampling standard laser interferometers are measured shift value and are calibrated the laser interferometer measurement shift value, by two of the standard laser interferometers that sampling obtains at every turn measure displacements average after with sampling simultaneously obtain to be calibrated the laser interferometer measurement shift value poor, obtain some sampled measurements error amounts.
2, a kind of displacement of the lines laser interferometer calibrating installation based on two Standard shafts, comprising that standard laser interferometer laser instrument and two are configured in can receive respectively two locational receivers of interference signal that the parallel standards measuring beam is corresponding, and wire is connected two receivers respectively with standard laser interferometer signal disposal system; Dispose can allowing of intermediate throughholes and be calibrated the twin shaft hollow standard laser interference mirror group that the laser interferometer measurement light beam passes on standard laser interferometer laser instrument output light path; Twin shaft hollow standard laser interference mirror group one side arrangement guide rail, sports platform is fitted on guide rail, the level crossing of interstitial hole is installed on sports platform, install in the level crossing interstitial hole and be calibrated the laser interferometer catoptron, be calibrated the laser interferometer catoptron and form by the level crossing of interstitial hole the target mirror that the plane of incidence is coplanar and relative position is fixing; Be calibrated laser interferometer interference mirror group and be calibrated the laser interferometer laser instrument in twin shaft hollow standard laser interference mirror group opposite side configuration, the described laser interferometer interference mirror group that is calibrated is positioned at and is calibrated on laser interferometer laser instrument output light path; Be calibrated the laser interferometer receiver and be configured in and can receive on the position that is calibrated the laser interferometer interference signal, wire will be calibrated the laser interferometer receiver and be calibrated the laser interferometer signal disposal system and be connected.
The present invention has following characteristics and good result:
(1) with parallel type laser interferometer calibrating installation, compare, owing to being calibrated the laser interferometer measurement light beam by the intermediate throughholes of twin shaft hollow laser interference mirror group, the vertical range be calibrated between laser interferometer measurement optical axis and parallel standards optical axis is shorter, both light paths are more approaching, and when therefore two cover laser interferometer are calibrated, Abbe error is very little.
(2) with face-to-face formula laser interferometer calibrating installation, compare, in the plane perpendicular to two canonical measure light beams, in the line segment zone formed at this plane projection point by two canonical measure light beams, article two, canonical measure light beam and be calibrated the laser interferometer measurement light beam and be subject to the degree difference of environmental interference very little, the air refraction mean value of two canonical measure light beams approaches the air refraction value that is calibrated the laser interferometer measurement light beam.
(3) light path formula laser interferometer calibrating installation is compared together, shares the interference mirror group and measures mirror, and standard laser interferometer component and to be calibrated standard laser interferometer component ownership clear and definite, be that on accurate meaning, two cover laser interferometer are calibrated.
The accompanying drawing explanation
Fig. 1 is parallel type laser interferometer calibrating installation structural representation
Fig. 2 is face-to-face formula laser interferometer calibrating installation structural representation
Fig. 3 is for being total to light path formula laser interferometer calibrating installation structural representation
Fig. 4 is the displacement of the lines laser interferometer calibrating installation structural representation based on two Standard shafts
Fig. 5 is hot spot position distribution schematic diagram on the level crossing by interstitial hole and the plane of incidence that is calibrated the target mirror that the laser interferometer catoptron forms
In figure: 1 standard laser interferometer laser instrument, 2 twin shaft hollow standard laser interference mirror groups, 3, article 4 two, parallel standards measuring beam, 5 have the level crossing of interstitial hole, 6, 7 standard laser interferometer receivers, 8 standard signal disposal systems, 9 are calibrated the laser interferometer laser instrument, 10 are calibrated laser interferometer interference mirror group, 11 are calibrated the laser interferometer measurement light beam, 12 intermediate throughholes, 13 are calibrated the laser interferometer catoptron, 14 are calibrated the laser interferometer receiver, 15 are calibrated the laser interferometer signal disposal system, 16 sports platforms, 17 guide rails, 18, article 19 two, parallel standards measuring beam facula position, 20 are calibrated laser interferometer beam and focus position.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the invention is described in further detail.
A kind of displacement of the lines laser interferometer calibrating installation based on two Standard shafts, comprise that standard laser interferometer laser instrument 1 and two are configured in the locational receiver 6,7 of the interference signal that can receive respectively two parallel standards measuring beam 3,4 correspondences, wire is connected two receivers 6,7 respectively with standard laser interferometer signal disposal system 8; Dispose can allowing of intermediate throughholes 12 and be calibrated the twin shaft hollow standard laser interference mirror group 2 that laser interferometer measurement light beam 11 passes on standard laser interferometer laser instrument 1 output light path; Twin shaft hollow standard laser interference mirror group 2 one side arrangement guide rails 17, sports platform 16 is fitted on guide rail 17, the level crossing 5 of interstitial hole is installed on sports platform 16, install in level crossing 5 interstitial holes and be calibrated laser interferometer catoptron 13, be calibrated laser interferometer catoptron 13 and form by the level crossing 5 of interstitial hole the target mirror that the plane of incidence is coplanar and relative position is fixing; Be calibrated laser interferometer interference mirror group 10 and be calibrated laser interferometer laser instrument 9 in the 2 opposite sides configurations of twin shaft hollow standard laser interference mirror group, the described laser interferometer interference mirror group 10 that is calibrated is positioned at and is calibrated on laser interferometer laser instrument 9 output light paths; Be calibrated laser interferometer receiver 14 and be configured in and can receive on the position that is calibrated the laser interferometer interference signal, wire will be calibrated laser interferometer receiver 14 and be calibrated laser interferometer signal disposal system 15 and be connected.
Described two parallel standards measuring beams 3,4 are with to be calibrated laser interferometer measurement light beam 11 all vertical with the target mirror plane of incidence.
The intermediate throughholes 12 of described twin shaft hollow standard laser interference mirror group 2 comprises arbitrary shape, and number is one or more.
Described every parallel standards measuring beam 3,4 and be calibrated laser interferometer measurement light beam 11 and the level crossing 5 of interstitial hole arranged respectively and be calibrated laser interferometer catoptron 13 reflection once or once.
The described laser interferometer catoptron 13 that is calibrated comprises level crossing, prism of corner cube, right-angle prism.
A kind of displacement of the lines laser interferometer calibration steps based on two Standard shafts, the method step is as follows:
(1) the output light of standard laser interferometer laser instrument 1 forms through twin shaft hollow laser interference mirror group 2 two canonical measure light beams 3 that are parallel to each other, 4, article two, canonical measure light beam 3, 4 incide on the level crossing 5 of interstitial hole, after being reflected back toward twin shaft hollow laser interference mirror group 2 with the part light of level crossing 5 displacement informations in every canonical measure light beam, according to from twin shaft hollow laser interference mirror group 2, obtain with two canonical measure light beams 3, two interference signals corresponding to 4 difference, can obtain the level crossing 5 of interstitial hole along canonical measure light beam 3, two shift values of 4 direction motions,
(2) the output light that is calibrated laser interferometer laser instrument 9 forms and is calibrated laser interferometer measurement light beam 11 through being calibrated laser interferometer interference mirror group 10, be calibrated the intermediate throughholes 12 of laser interferometer measurement light beam 11 through twin shaft hollow laser interference mirror group 10, with two canonical measure light beams 3, 4 is parallel and coplanar, being calibrated laser interferometer measurement light beam 11 incides and is calibrated on laser interferometer catoptron 13, after being reflected back toward and being calibrated laser interferometer interference mirror group 10, according to the interference signal obtained from be calibrated laser interferometer interference mirror group 10, can obtain being calibrated laser interferometer catoptron 13 along canonical measure light beam 3, the shift value of 4 direction motions,
(4) at sports platform 16 along in canonical measure light beam 3,4 direction to-and-fro movement processes, with at the uniform velocity or non-at the uniform velocity sampling rate, two of synchronized sampling standard laser interferometers are measured shift value and are calibrated the laser interferometer measurement shift value, by two of the standard laser interferometers that sampling obtains at every turn measure displacements average after with sampling simultaneously obtain to be calibrated the laser interferometer measurement shift value poor, obtain some sampled measurements error amounts.
Canonical measure beam and focus position 18,19 is respectively the position that two parallel standards measuring beams 3,4 incide the level crossing 5 of interstitial hole successively, being calibrated laser interferometer beam and focus position 20 is to be calibrated the position that 11 incidents of laser interferometer measurement light beam are calibrated laser interferometer catoptron 13, can find out and be calibrated the centre position that laser interferometer beam and focus position 20 is in canonical measure beam and focus position 18,19 from position distribution, two parallel standards measuring beams 3,4 will be calibrated laser interferometer measurement light beam 11 and be clamped in centre position.
Claims (6)
1. the displacement of the lines laser interferometer calibration steps based on two Standard shafts is characterized in that the method step is as follows:
(1) the output light of standard laser interferometer laser instrument forms two canonical measure light beams that are parallel to each other through twin shaft hollow laser interference mirror group, article two, the canonical measure light beam incides on the level crossing of interstitial hole, after being reflected back toward twin shaft hollow laser interference mirror group with the part light of level crossing displacement information in every canonical measure light beam, according to from twin shaft hollow laser interference mirror group, obtain with two canonical measure light beams corresponding two interference signals respectively, can obtain two shift values that the level crossing of interstitial hole moves along the canonical measure beam direction;
(2) the output light that is calibrated the laser interferometer laser instrument forms and is calibrated the laser interferometer measurement light beam through being calibrated laser interferometer interference mirror group, be calibrated the intermediate throughholes of laser interferometer measurement light beam through twin shaft hollow laser interference mirror group, parallel and coplanar with two canonical measure light beams, being calibrated the laser interferometer measurement light beam incides and is calibrated on the laser interferometer catoptron, after being reflected back toward and being calibrated laser interferometer interference mirror group, according to the interference signal obtained from be calibrated laser interferometer interference mirror group, can obtain being calibrated the shift value that the laser interferometer catoptron moves along the canonical measure beam direction,
(3) at sports platform along in canonical measure beam direction to-and-fro movement process, with at the uniform velocity or non-at the uniform velocity sampling rate, two of synchronized sampling standard laser interferometers are measured shift value and are calibrated the laser interferometer measurement shift value, by two of the standard laser interferometers that sampling obtains at every turn measure displacements average after with sampling simultaneously obtain to be calibrated the laser interferometer measurement shift value poor, obtain some sampled measurements error amounts.
2. the displacement of the lines laser interferometer calibrating installation based on two Standard shafts, comprising that standard laser interferometer laser instrument (1) and two are configured in can receive respectively the locational receiver of interference signal (6,7) that two parallel standards measuring beams (3,4) are corresponding, and wire is connected two receivers (6,7) respectively with standard laser interferometer signal disposal system (8); It is characterized in that disposing can allowing of intermediate throughholes (12) and be calibrated the twin shaft hollow standard laser interference mirror group (2) that laser interferometer measurement light beam (11) passes on standard laser interferometer laser instrument (1) output light path; Twin shaft hollow standard laser interference mirror group (2) one side arrangement guide rails (17), sports platform (16) is fitted on guide rail (17), the level crossing (5) of interstitial hole is installed on sports platform (16), install and be calibrated laser interferometer catoptron (13) in level crossing (5) interstitial hole, be calibrated laser interferometer catoptron (13) and have the level crossing (5) of interstitial hole to form the target mirror that the plane of incidence is coplanar and relative position is fixing; Be calibrated laser interferometer interference mirror group (10) and be calibrated laser interferometer laser instrument (9) in twin shaft hollow standard laser interference mirror group (2) opposite side configuration, the described laser interferometer interference mirror group (10) that is calibrated is positioned at and is calibrated on laser interferometer laser instrument (9) output light path; Be calibrated laser interferometer receiver (14) and be configured in and can receive on the position that is calibrated the laser interferometer interference signal, wire will be calibrated laser interferometer receiver (14) and be calibrated laser interferometer signal disposal system (15) and be connected.
3. the displacement of the lines laser interferometer calibrating installation based on two Standard shafts according to claim 2, is characterized in that described two parallel standards measuring beams (3,4) and to be calibrated laser interferometer measurement light beam (11) all vertical with the target mirror plane of incidence.
4. the displacement of the lines laser interferometer calibrating installation based on two Standard shafts according to claim 2, the intermediate throughholes (12) that it is characterized in that described twin shaft hollow standard laser interference mirror group (2) comprises that arbitrary shape, number are one or more.
5. the displacement of the lines laser interferometer calibrating installation based on two Standard shafts according to claim 2, is characterized in that described every parallel standards measuring beam (3,4) and be calibrated laser interferometer measurement light beam (11) level crossing (5) of interstitial hole being arranged respectively and being calibrated laser interferometer catoptron (13) reflection once or once.
6. the displacement of the lines laser interferometer calibrating installation based on two Standard shafts according to claim 2, is characterized in that the described laser interferometer catoptron (13) that is calibrated comprises level crossing, prism of corner cube, right-angle prism.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989678A (en) * | 2017-06-14 | 2017-07-28 | 山东同其智能科技有限公司 | A kind of device of utilization laser interferometry displacement |
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| DE4236993A1 (en) * | 1992-03-11 | 1993-11-18 | Gerald Dipl Ing Sparrer | Arrangement for direct comparison and for the calibration of laser interferometers and for precision measurement with a laser interferometer |
| CN103267581A (en) * | 2013-05-17 | 2013-08-28 | 中山大学 | Spectrum shearing interferometer suitable for measuring shaped pulses |
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Patent Citations (2)
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| DE4236993A1 (en) * | 1992-03-11 | 1993-11-18 | Gerald Dipl Ing Sparrer | Arrangement for direct comparison and for the calibration of laser interferometers and for precision measurement with a laser interferometer |
| CN103267581A (en) * | 2013-05-17 | 2013-08-28 | 中山大学 | Spectrum shearing interferometer suitable for measuring shaped pulses |
Non-Patent Citations (2)
| Title |
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| 冷玉国等: "《基于80m测量装置的双频激光干涉仪系统精度及影响因素分析》", 《计量与测试技术》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989678A (en) * | 2017-06-14 | 2017-07-28 | 山东同其智能科技有限公司 | A kind of device of utilization laser interferometry displacement |
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