Addressable structured light system using metasurface optics and an individually addressable VCSEL array  

作　　者：CHENYANG WU XUANLUN HUANG YIPENG JI TINGYU CHENG JIAXING WANG NAN CHI SHAOHUA YU CONNIE J.CHANG-HASNAIN 

机构地区：[1]School of Information Science and Technology,Fudan University,Shanghai 200433,China [2]Berxel Photonics Co.,Ltd.,Shenzhen 518071,China [3]Peng Cheng Laboratory,Shenzhen 518055,China [4]Chinese University of Hong Kong,Shenzhen 518172,China

出　　处：《Photonics Research》2024年第6期1129-1137,共9页光子学研究（英文版）

基　　金：Hetao Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone Program(HZQSWS-KCCYB-202203);National Key Research and Development Program of China(2022YFB2802803);National Natural Science Foundation of China(61925104,62031011);Shenzhen Science and Technology Innovation Program(JSGG20220831110404008,KQTD20200820113053102,ZDSYS20220325163600001);Guangdong Major Talent Introduction Project(2021ZT09X328).

摘　　要：Structured-light(SL)based 3D sensors have been widely used in many fields.Speckle SL is the most widely deployed among all SL sensors due to its light weight,compact size,fast video rate,and low cost.The transmitter(known as the dot projector)consists of a randomly patterned vertical-cavity surface-emitting laser(VCSEL)array multiplicated by a diffractive optical element(DOE)with a fixed repeated pattern.Given that the separation of any two speckles is only one known and fixed number(albeit random),there are no other known scales to cal-ibrate or average.Hence,typical SL sensors require extensive in-factory calibrations,and the depth resolution is limited to 1 mm at-60 cm distance.In this paper,to the best of our knowledge,we propose a novel dot projector and a new addressable SL(ASL)3D sensor by using a regularly spaced,individually addressable VCSEL array,multiplicated by a metasurface-DOE(MDOE)into a random pattern of the array.Dynamically turning on or off the VCSELs in the array provides multiple known distances between neighboring speckles,which is used as a“built-in caliper”to achieve higher accuracy of depth.Serving as a precise“vernier caliper,”the addressable VCSEL array enables fine control over speckle positions and high detection precision.We experimentally dem-onstrated that the proposed method can result in sub-hundred-micron level precision.This new concept opens new possibilities for applications such as 3D computation,facial recognition,and wearable devices.

关 键 词：SPECKLE LIGHT SURFACE 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TP391.41[自动化与计算机技术—控制科学与工程]