基于白光LED和LD的准直测量比较

刘未华; 冯其波

doi:doi:10.3788/gzxb20174609.0912004

光子学报, 2017, 46 (9): 0912004, 网络出版: 2017-10-16

基于白光LED和LD的准直测量比较

Comparison on Collimation Measurement between White LED and LD

论文大纲

刘未华 ^*冯其波

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，北京 100044

准直测量稳定性比较研究发光二极管半导体激光器 Collimation measurement Stability Compare research LED LD

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

To research the feasibility, advantages and disadvantages of using white LED in collimation measurement, the comparison was conducted between collimated beams from a white LED and a LD, through comparative experiments of stability in intensity and positioning during a long-term work and the stability influenced by different air disturbance. The study found that the LD needs to preheat before working, and its intensity is unstable due to raising temperature inner the laser when working for long time, while the white LED beam can keep unchanged for long time without preheating. As a cool source, the white LED introduces less drift caused by deformation of mechanical structure resulting from heating. In research on influence of air disturbance, it shows that the white LED perfects not good as the LD. According to theoretical analysis on uniform temperature gradient field in air, and calculation results of beam drift with different wavelengths in white beam under the same disturbance, a beam with longer wavelength is less affected by disturbance. Thus the influence on the white beam is a weighted average of beams with different wavelengths and intensity, which is bigger than the influence on LD. Finally, the measurements of straightness errors of a linear guide using two collimated beams were conducted, which shows intensity distribution of the white LED beam keeps stable in propagation. Over all, the white LED has low cost, more stable intensity and less heating, and can be applied for collimation measurement.

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刘未华, 冯其波. 基于白光LED和LD的准直测量比较[J]. 光子学报, 2017, 46(9): 0912004. LIU Wei-hua, FENG Qi-bo. Comparison on Collimation Measurement between White LED and LD[J]. ACTA PHOTONICA SINICA, 2017, 46(9): 0912004.

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