Evaluation of metrology technologies for free form surfaces K. Arámbula, H.R. Siller, L. De Chiffre, C.A. Rodríguez and A. Cantatore Int. J. Metrol. Qual. Eng., 3 1 (2012) 55-62 Published online: 26 September 2012 DOI: 10.1051/ijmqe/2012002