In this paper, a novel velocimeter based on laser self-mixing Doppler technology has been developed for speed measurement. The laser employed in our experiment is a distributed feedback (DFB) fiber laser, which is an all-fiber structure using only one Fiber Bragg Grating to realize optical feedback and wavelength selection. Self-mixing interference for optical velocity sensing is experimentally investigated in this novel system, and the experimental results show that the Doppler frequency is linearly proportional to the velocity of a moving target, which agrees with the theoretical analysis commendably. In our experimental system, the velocity measurement can be achieved in the range of 3.58 mm/s–2216 mm/s with a relative error under one percent, demonstrating that our novel all-fiber configuration velocimeter can implement wide-range velocity measurements with high accuracy.
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机译:本文研究了一种基于激光自混合多普勒技术的新型测速仪,用于速度测量。我们的实验中使用的激光器是分布式反馈(DFB)光纤激光器,它是仅使用一个光纤布拉格光栅来实现光反馈和波长选择的全光纤结构。在该新型系统中,对光速传感的自混合干扰进行了实验研究,实验结果表明,多普勒频率与运动目标的速度成线性比例关系,与理论分析相符。在我们的实验系统中,速度测量可以在3.58 mm / s–2216 mm / s的范围内实现,相对误差小于1%,这表明我们新颖的全光纤配置测速仪可以实现高范围的宽范围速度测量准确性。
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