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- W2005455612 abstract "ABSTRACT Straightness measurement is a very important technique in the field of Mechanical Engineering. A particular applicationwould be very high accuracy machining on a diamond turning lathe. In this paper a novel optical method for measuringstraightness of motion using reflection confocal optics is proposed. The advantage of this method in comparison with thetransmission optical systems used by Burch and Williams' is that the lateral displacements in the direction of the two axesperpendicular to the optical axis, and the rotation angles around all three axes, can be measured simultaneously. This can bevery useful for straightness measurement. Also, reflection optical systems are more compact in length.Keywords: straightness measurement, optical alignment, reflection confocal optical system, straightness measurement ofmotion, geometrical optics SUMMARY When a table moves along a guide way, lateral displacement occurs which often needs to be measured. There have beenseveral proposals to measure this displacement using optical, rather than mechanical methods. Optical methods are classifedaccording to the optical principle used: interference, Moire gratings, or geometrical optics. The optical methods offer theadvantages of being non-contacting and able to measure lateral displacements accurately over a long distance.Burch and Williams' (1974) developed a geometrical optical system using a transmission confocal design. Using theirmethod, lateral displacements in the direction of the two axes perpendicular to the optical axis can be measured, along withrotation angles around those axes. The method described here is based on reflection confocal systems. The advantage of thismethod is that lateral displacements in the direction of the two axes to the optical axis can be measured, along with rotationangles around all three axes. Also shorter length optical systems may be measured using a reflection optical system. Theaccuracy of the lateral displacement measurement is several micrometres for movements of the order of a metre. In thefuture we plan to improve the accuracy to better than one hundred nanometres using a position displacement magnifyingdevice that is being developed by our group.The figure shows top and side views of a table MT which moves along a guide way GW and an optical arrangement formeasuring its motion using a reflection confocal optical system. The light beam from a He-Ne laser HL is divided intotwo beams by a beam splitter BS and a mirror M ." @default.
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- W2005455612 date "1999-07-19" @default.
- W2005455612 modified "2023-09-23" @default.
- W2005455612 title "<title>Straightness measurements using a reflection confocal optical system</title>" @default.
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- W2005455612 doi "https://doi.org/10.1117/12.354902" @default.
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