Design of Dammann grating based on the parallel recombination simulated annealing algorithm

Photography is an applicable method for online dimensional measurement of hot forgings and artificial marked dots help detailed information capture in photographic measurement. But traditional physical characteristic dots array is not fitted in high temperature forging measurement conditions. In high temperature situation, non-contacted optical marked dots array generated by Dammann grating is a preferred choice. This paper puts forward using parallel recombination simulated annealing algorithm (PRSA) to optimize the design of Dammann grating which is used as optical projector to produce 19 × 19 dots array. The Dammann grating is designed and tested in practical forging measurement, entirely meeting the vision measurement requirements.