A high-precision dilatometer based on sub-nm heterodyne interferometry

@article{Schuldt2009AHD,
  title={A high-precision dilatometer based on sub-nm heterodyne interferometry},
  author={Thilo Schuldt and Martin Gohlke and Dennis Weise and Ulrich Johann and Claus Braxmaier},
  journal={2009 International Symposium on Optomechatronic Technologies},
  year={2009},
  pages={146-151}
}
In this paper, we present a high-precision dilatometer for dimensional characterization of highly-stable materials. The dilatometer is based on a highly symmetric heterodyne interferometer where a reference and a measurement mirror are fixed inside a tubular shaped specimen made of the material under investigation. The specimen is placed inside a thermally controlled oven; the temperature can be varied between 20°C and 60°C. We measured the linear coefficient of thermal expansion (CTE) of tubes… CONTINUE READING
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