光学学报, 2020, 40 (2): 0212003, 网络出版: 2020-01-02
基于二元光学透镜光谱聚焦特性的微间距测量 下载: 1123次
Microspacing Measurement Based on Spectral Focusing Characteristics of Binary Optical Lens
测量 光谱 共聚焦 二元光学透镜 轴向色散 测距 measurement spectra confocusing binary optical lens axis dispersion ranging
摘要
针对传统色散透镜的色散线性度很难保证为绝对线性,测量范围很窄的问题,且为了尽量减小球差尤其是对测量影响最大的轴向球差,提出一种将二元光学透镜引入到光谱共聚焦微小间距测量的方法。该方法中二元光学透镜的色散只与入射光的波长有关,且严格与入射光的波长成反比。二元光学透镜不存在球差问题且可以补偿校正测量系统中其他光学组件的未知色差。实验中选择510~690 nm范围内的光谱,利用分辨率为0.5 nm的光谱仪接收光谱信息,测得该方法的测量量程为13.95 mm,测量误差为0.6 μm,并通过对光盘上的刻录间距进行测量,验证了该方法的有效性。
Abstract
A method of introducing a binary optical lens into spectral confocal micro-spacing measurement is proposed to address the problems that the dispersion linearity of a conventional dispersion lens is difficult to ensure absolute linearity and that the measurement range is narrow, meanwhile minimizing spherical aberration, particularly the axial spherical aberration which has the greatest influence on measurement. In the proposed method, the dispersion of the binary optical lens is only related to the wavelength of the incident light and it is strictly inversely proportional to the wavelength of the incident light. Binary optical lenses do not exhibit spherical aberration problems and can also compensate for the unknown chromatic aberrations of other optical components in the calibration measurement system. In the experiment, a spectrum in the range of 510--690 nm is selected, and the spectral information is received by a spectrometer with a 0.5-nm resolution. Furthermore, the measurement range of this method is 13.95 mm, the measurement error is 0.6 μm, and the recording spacing with respect to the optical disc is measured to verify the effectiveness of the proposed method.
王思沫, 李凡星, 彭伏平, 杜佳林, 严伟. 基于二元光学透镜光谱聚焦特性的微间距测量[J]. 光学学报, 2020, 40(2): 0212003. Simo Wang, Fanxing Li, Fuping Peng, Jialin Du, Wei Yan. Microspacing Measurement Based on Spectral Focusing Characteristics of Binary Optical Lens[J]. Acta Optica Sinica, 2020, 40(2): 0212003.