Interferometry at the PTB Nanometer Comparator: design, status and development

J. Flügge; Ch. Weichert; H. Hu; R. Köning; H. Bosse; A. Wiegmann; M. Schulz; C. Elster; R. D. Geckeler

doi:10.1117/12.821252

12 January 2009 Interferometry at the PTB Nanometer Comparator: design, status and development

J. Flügge, Ch. Weichert, H. Hu, R. Köning, H. Bosse, A. Wiegmann, M. Schulz, C. Elster, R. D. Geckeler

Proceedings Volume 7133, Fifth International Symposium on Instrumentation Science and Technology; 713346 (2009) https://doi.org/10.1117/12.821252
Event: International Symposium on Instrumentation Science and Technology, 2008, Shenyang, China

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.

Citation Download Citation

J. Flügge, Ch. Weichert, H. Hu, R. Köning, H. Bosse, A. Wiegmann, M. Schulz, C. Elster, and R. D. Geckeler "Interferometry at the PTB Nanometer Comparator: design, status and development", Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 713346 (12 January 2009); https://doi.org/10.1117/12.821252

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