杨蕊瑜 王帅 张彬 孙年春

摘要：针对强湍流像差校正、气动流场像差测量等高速波前探测场景，提出一种基于片上质心计算的高速哈特曼波前传感器设计，将光斑图像数据在输出之前做预处理，将预处理获取的光斑质心而非光斑图像作为光电探测器高速实时输出的数据，从而大幅压缩高速波前探测所需的实时传输数据量，可显著提升哈特曼波前传感器的实时探测速度。测试结果表明，提出的设计方案基于常规 GigE Vision接口即可实现10 kHz 以上的高速波前实时测量，有望为哈特曼波前传感器的自适应光学校正、气动光学效应测量等应用场景提供一种实时、高速波前测量新的技术手段。关键词：自适应光学;片上质心计算;高速波前探测;哈特曼波前传感器

中图分类号： O438.2;TB9文献标志码： A文章编号：1674–5124（2021）12–0142–07

High-speed Hartmann wavefront sensor technology based on chip centroid calculation

YANG Ruiyu1，2，WANG Shuai2，ZHANG Bin1，SUN Nianchun1

（1. School of Electronic Information， Sichuan University， Chengdu 610065， China;2. Key Laboratory ofAdaptive Optics， Chinese Academy of Sciences， Chengdu 610209， China）

Abstract： Aiming at high-speed wavefront detection scenarios such as strong turbulence aberration correction and aerodynamic flow field aberration measurement， a high-speed Hartmann wavefront sensor design based on on-chip centroid calculation is proposed. The spot image data is preprocessed before output. And the pre- processedspotcentroidsinsteadof thespotimageisusedashigh-speedreal-timeoutputdataof the photodetector of wavefront sensor. This design can greatly reduce the amount of real-time transmission data requiredforhigh-speedwavefrontdetectionandsignificantlyimprovethereal-timedetectionspeedof Hartmann wavefront sensor. The test results show that the proposed scheme can achieve high-speed， high- resolution real-time wavefront measurement above 10 kHz based on the conventional GigE Vision interface and is expected to provide a new technique for Hartmann wavefront sensor to realize real-time and high-speed wavefront measurement in application scenarios， such as adaptive optical and measurement of aero-optical effects.

Keywords： adaptive optics; on-chip centroid calculation; high-speed wavefront detection; Hartmann wavefrontsensor

0引言

在各類波前传感器中，哈特曼波前传感器因结构紧凑、速度快、光能利用率高和对环境要求低等诸多优点，已被广泛应用于自适应光学系统、光学检测、空气扰动分析、激光光束检测等领域[1-3]。作为一种重要的波前畸变高速测量技术手段，提高探测速度、提升测量精度一直是哈特曼波前传感器技术的研究热点和重点改进方向。

在提高探测速度方面，受限于哈特曼波前传感技术的测量原理，在高速测量条件下，哈特曼波前传感器的核心组件——高速相机需将海量的光斑图像数据实时输出至波前处理机中作波前复原运算。为此，哈特曼波前传感器光斑阵列图像数据量和高速相机接口的传输带宽直接决定了波前传感器的测量速度上限。……