Noncontact distance sensor using spatial signal processing

作     者：Riza, Nabeel A. Reza, Syed Azer 

作者机构：Univ Cent Florida CREOL Coll Opt Photon Informat Proc Syst Lab Orlando FL 32816 USA 

出 版 物：《OPTICS LETTERS》 (光学快报)

年 卷 期：2009年第34卷第4期

页      面：434-436页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

主　　题：Electronics object distance control variable Sensors Object measurement Optical detectors laser beams moving travel FOCAL LENGTH 

摘      要：To the best of our knowledge, proposed is the first distance-measurement sensor using direct spatial signal processing. The sensor is implemented using a laser beam engaged in target-dependent spatial beam processing using an electronically controlled variable focus lens (ECVFL). Specifically, the target-reflected beam is observed by an optical detector while electronically scanning the focal length of the ECVFL in the path of the laser beam. A received-beam minimum spatial size corresponds to a specific ECVFL focal length that in turn is used to compute the sensed target distance. Experiments have been conducted using a 633 mn He-Ne laser and a liquid ECVFL, giving target distance measurements from 6 to 109 cm with a 1.7% sensor resolution. Various noncontact applications for the sensor include sensing of object measurement parameters of distance, motion displacement, three-dimensional structure, spatial profile, and levels. (c) 2009 Optical Society of America