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Proceedings Paper

Interferometry at the PTB Nanometer Comparator: design, status and development
Author(s): J. Flügge; Ch. Weichert; H. Hu; R. Köning; H. Bosse; A. Wiegmann; M. Schulz; C. Elster; R. D. Geckeler
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Paper Abstract

To minimize the measurement uncertainty of one dimensional length measurements on line scales, linear encoders and interferometers the PTB in cooperation with the Dr. Johannes Heidenhain GmbH had built up a new length comparator. The Nanometer Comparator [1,2] has already proven its performance during the measurements of incremental encoders and line scales with an expanded measurement uncertainty of below 5 nm [3,4,5]. Due to the introduction of double and multiple exposure in advanced lithography techniques the overlay and registration metrology requirements will drastically increase so that reference metrology tools need to be developed further to be able to follow the resulting decrease of the specifications. Therefore, the PTB further develops the new 1D vacuum comparator to add a measurement possibility for straightness and to reach a measurement accuracy in the sub nanometer range [6]. One key development will be the interferometric measurement of all six degrees of freedom of the measurement slide of the comparator. A new multi axis heterodyne interferometer electronics and optical interferometer designs minimizing nonlinearities by spatially separated beams are under development.

Paper Details

Date Published: 12 January 2009
PDF: 8 pages
Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 713346 (12 January 2009); doi: 10.1117/12.821252
Show Author Affiliations
J. Flügge, Physikalisch-Technische Bundesanstalt (Germany)
Ch. Weichert, Physikalisch-Technische Bundesanstalt (Germany)
H. Hu, Physikalisch-Technische Bundesanstalt (Germany)
R. Köning, Physikalisch-Technische Bundesanstalt (Germany)
H. Bosse, Physikalisch-Technische Bundesanstalt (Germany)
A. Wiegmann, Physikalisch-Technische Bundesanstalt (Germany)
M. Schulz, Physikalisch-Technische Bundesanstalt (Germany)
C. Elster, Physikalisch-Technische Bundesanstalt (Germany)
R. D. Geckeler, Physikalisch-Technische Bundesanstalt (Germany)

Published in SPIE Proceedings Vol. 7133:
Fifth International Symposium on Instrumentation Science and Technology
Jiubin Tan; Xianfang Wen, Editor(s)

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