红外多光谱相机高精度同步控制设计与验证  

Design and experiment on high-precision synchronous control of multispectral infrared camera

作　　者：游绣月 唐义 张丽君 王冬晓 李泳辉 张肃 YOU Xiuyue;TANG Yi;ZHANG Lijun;WANG Dongxiao;LI Yonghui;ZHANG Su(Key Laboratory of Photoelectronic Imaging Technology and System,Ministry of Education,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Longrays Photoelectric Technology in Suzhou Co.,Ltd.,Suzhou 215300,China)

机构地区：[1]北京理工大学光电学院光电成像技术与系统教育部重点实验室,北京100081 [2]苏州朗晖光电科技有限公司,江苏苏州215300

出　　处：《红外与激光工程》2024年第11期130-139,共10页Infrared and Laser Engineering

基　　金：国家重点研发计划项目(2022YFC3300802);上海航天科技创新基金项目(SAST2023028)。

摘　　要：传统滤光轮多光谱相机难以适用于高速成像应用场景,为了实现高速红外成像,设计了一种长波红外多光谱同步成像系统,并研制了原理样机。对该系统所采用的电子学设计、同步控制方法、成像精度计算方法等进行研究。首先,根据系统总体工作原理介绍了同步控制的电子学设计。然后,针对多光谱相机波段切换与探测器成像的同步难点,提出了一种串级双闭环同步控制方法,将位置传感器的位置信号与探测器外触发信号进行联动,保证谱段切换与探测器成像的闭环同步。最后,提出了同步成像精度评价方法,进行了误差分析及精度计算。实验结果表明:系统实现了高速高精度红外同步成像,帧率为150 Hz,基于编码器的同步控制误差为0.107°,成像误差仅为一个像素,完全满足系统精度指标要求3.255°。设计方法适用于多种形式的滤光轮多光谱相机。Objective Long-wave infrared has the advantages of good atmospheric transmittance,high temperature sensitivity,and high spatial resolution,making it suitable for various complex environments.Infrared multispectral imaging technology combines the advantages of infrared imaging and multispectral technology,greatly improving the accuracy of target detection.Using an infrared multispectral camera,spatial characteristics,temperature radiation,and spectral characteristics of the target can be obtained.Filter wheel-based multispectral cameras have the advantages of compact structure,small size,high spatial resolution,large field of view,and good flexibility.Domestic and foreign scholars have conducted a lot of research on this.However,these studies have shortcomings such as slow band switching,low frame rate,and low synchronous imaging accuracy,which are not suitable for high-speed imaging applications.This study designs a filter wheel-based infrared multispectral synchronous imaging system for high-speed imaging.To address the synchronization challenges,a phase-locked loop synchronous control method is proposed,and the theoretical accuracy is analyzed and calculated to achieve high-precision synchronous imaging,providing reference for the design of similar instruments.Methods The synchronous control circuit is the core of the system,and research is conducted on the synchronous control method and imaging accuracy calculation method.Firstly,to address the challenges of synchronization,a cascaded dual closed-loop synchronization control method is proposed to link the pulse signal of the position sensor with the external trigger signal of the detector,ensuring closed-loop frequency synchronization between spectral segment switching and detector imaging.Subsequently,a method for evaluating synchronization imaging accuracy is proposed,along with error analysis and accuracy calculation.Finally,the complete system is developed,and the synchronous imaging accuracy of the encoder and Hall sensor is experimentally tested,followed

关 键 词：多光谱相机 同步控制 滤光轮 红外成像 

分 类 号：TH765[机械工程—仪器科学与技术]