Design and testing of a chromatic dispersion system for displacement application by using a spatial-bandpass-filter

Jiao Bai; Xiaohao Wang; Xinghui Li; Qian Zhou; Kai Ni

doi:10.1117/12.2512172

7 March 2019 Design and testing of a chromatic dispersion system for displacement application by using a spatial-bandpass-filter

Jiao Bai, Xiaohao Wang, Xinghui Li, Qian Zhou, Kai Ni

Author Affiliations +

Proceedings Volume 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation; 110533I (2019) https://doi.org/10.1117/12.2512172
Event: 10th International Symposium on Precision Engineering Measurements and Instrumentation (ISPEMI 2018), 2018, Kunming, China

Abstract

Chromatic confocal displacement measurement is a newly developed technology for linear precision positioning with a sub-micron meter accuracy over a millimeter order range. In this technique, the chromatic spectrum of a white light source is divided by an optical dispersion system. The encoded spectrum disperses along the axial direction, with which the axial position can be detected by a spectrometer at a high precision. Thus, the optical dispersion system that determines the final measurement precision is required to own a large dispersion capacity and a small spherical aberration. A chromatic dispersion lens (CDL) module and a spatial-bandpass-filter (SBF) were proposed in this research to improve the dispersion performance. Based on the geometrical imaging principle, the CDL and SBF parameters were preliminarily designed and further tested by the optical design software ZEMAX. The testing results verified that with SBF and CDL, the spherical aberration was largely reduced and the imaging quality was greatly modified. The focus beam spot of the central wavelength 550 nm can be as small as 10μm. Under such a condition, the measurement error is no larger than ±0.7μm over a 1700μm measurement range.

Citation Download Citation

Jiao Bai, Xiaohao Wang, Xinghui Li, Qian Zhou, and Kai Ni "Design and testing of a chromatic dispersion system for displacement application by using a spatial-bandpass-filter", Proc. SPIE 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation, 110533I (7 March 2019); https://doi.org/10.1117/12.2512172

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