@article{hitchman2015heterodyne,
  title={Heterodyne interferometry for the detection of elastic waves: a tutorial and open-hardware project},
  author={Hitchman, Sam and van Wijk, Kasper and Broderick, Neil and Adam, Ludmila},
  journal={European Journal of Physics},
  volume={36},
  number={3},
  pages={035011},
  year={2015},
  publisher={IOP Publishing}
}