In the last two decades, three-dimensional sensors based on misfocusing have been suggested. This research addresses the question of measuring several focal depths simultaneously. Two options for generating the necessary array of spots are analyzed: the use of a lenslet array and the use of a Dammann grating. Finally, a combination of the two approaches is proposed. Such a combination enables tailoring the system performance to the exact needs of the user.
© 1998 Optical Society of America
David Mendlovic and Eran Gur, "Three-Dimensional Sensing by Using a Lenslet, a Dammann Grating, and a Combination," Appl. Opt. 37, 125-129 (1998)