A practical multiplied-moiré system

  title={A practical multiplied-moir{\'e} system},
  author={Charles R. Walker and James McKelvie},
  journal={Experimental Mechanics},
This paper describes a multiplied-moiré-fringe system, of in-plane displacement measurement, which is particularly suitable for high-sensitivity studies, both under laboratory conditions and for field studies. A replica technique is used for applying a relief grid to the specimen, and for recording the deformed grid. A fringe-multiplication method is used to give effective line densities in the range 400–2,000 lines/mm (10,000–50,000 lines/in.). Application of the method to fatigue studies is… CONTINUE READING