基于白光LED和LD的准直测量比较

发布时间：2018-06-11 20:14

本文选题：准直测量 + 稳定性　；参考：《光子学报》2017年09期

【摘要】：为探究白光LED用于准直测量的可行性与优劣势,将其与LD的准直光束对比,进行功率和定位的长期稳定性以及不同空气扰动下的稳定性实验与分析.实验结果表明:在功率稳定性方面,LD开机预热后功率才能趋于稳定,长时间工作会因激光器发热而受到影响,而白光LED无需预热便能长时间保持稳定;在定位稳定性方面,白光LED产热少,由其作为热源引起系统结构的漂移明显小于LD;根据以空气中存在均匀温度梯度场为模型的理论分析和同一干扰下白光中不同波长成分的漂移量计算结果,发现在同样干扰下,波长越长,光束受影响程度越小,白光所受影响略大于LD,为不同波长不同强度光束的加权平均效果.最后,通过基准验证实验,比较两种准直光束对同一直线导轨直线度误差的测量结果,发现白光LED准直光束在传播过程中强度分布保持稳定.研究表明白光LED成本低、功率稳、发热少,适用于准直测量.
[Abstract]:In order to explore the feasibility and advantage of white LED in collimation measurement, the long-term stability of power and location and the stability under different air disturbances were compared with LD collimation beam. The experimental results show that the power of LD can be stable only after it is preheated in power stability, the long working time will be affected by the laser heating, and the white LED can be kept stable for a long time without preheating. White LED produces less heat, and the drift of system structure caused by white LED as heat source is obviously smaller than that of LD.The theoretical analysis of uniform temperature gradient field in air and the calculation results of drift of different wavelength components in white light under the same interference are carried out. It is found that under the same interference, the longer the wavelength is, the less the influence of the beam is, and the influence of the white light is slightly greater than that of the LD.It is the weighted average effect of the beams with different wavelengths and different intensities. Finally, by comparing the measured results of two collimating beams to the straightness error of the same linear guide rail, it is found that the intensity distribution of the collimating beam of white LED remains stable in the process of propagation. The research shows that white LED has the advantages of low cost, stable power and less heating. It is suitable for collimation measurement.
【作者单位】：北京交通大学理学院发光与光信息教育部重点实验室;
【基金】：国家自然科学基金国家重大科研仪器研制项目(No.51527806)资助~~
【分类号】：TN248;TN312.8

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