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单模VCSEL自混合激光多普勒测速研究
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摘要
本学位论文工作以国际合作为背景,研究单模垂直腔面发射激光器(VCSEL)自混合测速重点研究多普勒测速系统的精度、动态范围和方向判别等重要参数。本论文的研究工作和研究成果主要有:
     (1)与项目组成员共同完成单模VCSEL自混合多普勒测速的原理与系统研究;建立单模VCSEL自混合多普勒测速实验装置,设计系统的光电信号处理电路;制作了高精度宽动态范围准确方向判别LDV样机:研究结果获得了美国专利。
     (2)采用单模VCSEL代替普通半导体激光器,明显改善了多普勒测速系统外腔长变化的动态范围,提高了测速精度;采用差频模拟锁相技术处理多普勒信号,减小了多普勒频率展宽及调幅包络对测速精度的影响,使测速精度达到1%,同时扩大了频率跟踪范围,使测速动态范围达到5~500mm/s。
     (3)采用三角波电流调制单模VCSEL进行方向判别,使用微小电流调制与中和技术克服了调制三角波对测速精度的影响;采用分频跟踪调制技术提高了方向判别的动态范围,使方向判别的动态范围达到5~500mm/s,方向判别准确可靠。
     (4)在外腔长度为30±1mm,速度范围为30~480mm/s,采样时间为0.1s的条件下,单模VCSEL自混合多普勒测速系统测速精度优于1%,重复精度优于0.2%,方向判别准确。
     创新点:提出了模拟差频锁相方法处理多普勒信号,提高了测速精度和测速的动态范围。提出分频跟踪三角波调制运动速度判别方法,提高了速度方向判别的可靠性和动态范围。
The works in this thesis are on the basis of international cooperate projects.The project on single mode vertical-cavity surface-emitting laser(VCSEL)laser Doppler velocimeter(LDV)has been complete successfully.We have emphasized the study of measurement precision,dynamic range and direction discrimination of LDV system.
     The main research works and conclusions are as following:
     (1)Cooperate with project members in completing the theory and system researches of single mode VCSEL LDV.We have constructed single mode VCSEL LDV experimental setup and designed optoelectronic signal processing circuits of LDV system,then we have analyzed main factors influencing the system important parameters in theory and experiment,such as velocity measurement precision, dynamic range and direction discrimination precision,etc.A LDV tracking prototype has been developed and a patent on LDV senser is obtained.
     (2)We use single mode VCSEL in place of common semiconductor Laser diode(LD),and the dynamic range of external cavity length of LDV system has been expanded obviously,and velocity measurement precision has been improved.We use difference frequency analog phase-locked loop(PLL)technique to process Doppler signal,and the velocity measurement error induced by Doppler signal spectrum width and amplitude modulation(AM)envelope has been reduced.The measurement precision has been reached 1%,and the tracking frequency range has been expanded, so that the velocity measurement range is 5~500mm/s.
     (3)We use triangular wave current modulating the VCSEL to discriminiate direction with high precision,and use small current modulation and neutralization technique to conquer the influence on the velocity measurement precision by modulation triangular signal.We use frequency-division tracking modulation to improve the dynamic range of direction discrimination and expand the dynamic range of direction discrimination to be 5~500mm/s,at the same time the reliability is better than 99.9%.
     (4)With the external cavity length is 30±1mm,the velocity range is between 30mm/s to 480mm/s,sampling time is 0.1s,the velocity measurement precision is better than 1%,and repeatable precision is better than 0.2%,and the reliability of direction discrimination is high.The author completes the research on the velocity measurement precision of single mode VCSEL self-mixing LDV.
     Highlights of the dissertation are as following:
     Use single mode VCSEL in place of common semiconductor LD to study LDV,and the dynamic range of external cavity length of LDV system has been improved obviously.Use difference frequency analog PLL technique to process Doppler signal to reduce the influence on velocity measurement precision by Doppler signal spectrum width and amplitude modulation envelope and to expand the tracking frequency range and the precision and dynamic range of velocity measurement have been improved.VCSEL operating current modulated by trangular wave,whose frequency is N-divided form Doppler freency,is employed for motion direction discrimination.The dynamic range of direction dircrimination is expanded by this frequency-tracking method.
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