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Picometre and nanoradian heterodyne interferometry and its application in dilatometry and surface metrology
| Content Provider | Scilit |
|---|---|
| Author | Schuldt, T. Gohlke, M. Kögel, H. Spannagel, R. Peters, A. Johann, U. Weise, D. Braxmaier, C. |
| Copyright Year | 2012 |
| Description | Journal: Measurement Science and Technology A high-sensitivity heterodyne interferometer implementing differential wavefront sensing for tilt measurement was developed over the last few years. With this setup, using an aluminium breadboard and compact optical mounts with a beam height of 2 cm, noise levels less than 5 pm $Hz^{−1/2}$ in translation and less than 10 nrad $Hz^{−1/2}$ in tilt measurement, both for frequencies above $10^{−2}$ Hz, have been demonstrated. Here, a new, compact and ruggedized interferometer setup utilizing a baseplate made of Zerodur, a thermally and mechanically highly stable glass ceramic with a coefficient of thermal expansion (CTE) of 2 × $10^{−8}$ $K^{−1}$, is presented. The optical components are fixed to the baseplate using a specifically developed, easy-to-handle, assembly-integration technology based on a space-qualified two-component epoxy. While developed as a prototype for future applications aboard satellite space missions (such as Laser Interferometer Space Antenna), the interferometer is used in laboratory experiments for dilatometry and surface metrology. A first dilatometer setup with a demonstrated accuracy of $10^{−7}$ $K^{−1}$ in CTE measurement was realized. As it was seen that the accuracy is limited by the dimensional stability of the sample tube support, a new setup was developed utilizing Zerodur as structural material for the sample tube support. In another activity, the interferometer is used for characterization of high-quality mirror surfaces at the picometre level and for high-accuracy two-dimensional surface characterization in a prototype for industrial applications. In this paper, the corresponding designs, their realizations and first measurements of both applications in dilatometry and surface metrology are presented. |
| Related Links | http://iopscience.iop.org/article/10.1088/0957-0233/23/5/054008/pdf |
| ISSN | 09570233 |
| e-ISSN | 13616501 |
| DOI | 10.1088/0957-0233/23/5/054008 |
| Journal | Measurement Science and Technology |
| Issue Number | 5 |
| Volume Number | 23 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2012-03-22 |
| Access Restriction | Open |
| Subject Keyword | Journal: Measurement Science and Technology Industrial Relations Coefficient of Thermal Expansion Space Missions |
| Content Type | Text |
| Resource Type | Article |
| Subject | Applied Mathematics Instrumentation Engineering |
