Design research of chromatic lens in chromatic confocal point sensors

Yanlei Li; Junpeng Fan Sr.; Jing Wang; Chenyuan Wang; Hua Fan

doi:10.1117/12.2500643

24 July 2018 Design research of chromatic lens in chromatic confocal point sensors

Yanlei Li, Junpeng Fan Sr., Jing Wang, Chenyuan Wang, Hua Fan

Author Affiliations +

Proceedings Volume 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018); 108270D (2018) https://doi.org/10.1117/12.2500643
Event: Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 2018, Shanghai, China

Abstract

Chromatic confocal point sensors are used to measure the high-precision surface distance, and it's based on the theory of chromatic dispersion and encodes the distance between the measure surface and chromatic lens. By accurately measuring the wavelength value, it indirectly calculates the distance to object surface. The accuracy of the sensor depends on the chromatic range of the lens and the resolution of the spectrograph. It is difficult to design wide measuring range chromatic lens that meanwhile satisfies the high-precision requirement. This paper proposes an optimization method to design high-precision chromatic lens for chromatic confocal point sensors. Firstly, we theoretically study the relationship of the pin-hole diameter and the sensors' performance denoted with the resolution and signal-to-noise ratio(SNR). Then, using the optimization objective FWHM(Full Width at Half Maximum), we build the mathematical model about N.A.(Numerical Aperture), PD(Pupil Diameter) and Δf. Finally, based on the optimization method, we design chromatic lens with Zemax Software, the performance gets the accuracy 2μm in the measure range 1mm.

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Yanlei Li, Junpeng Fan Sr., Jing Wang, Chenyuan Wang, and Hua Fan "Design research of chromatic lens in chromatic confocal point sensors", Proc. SPIE 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 108270D (24 July 2018); https://doi.org/10.1117/12.2500643

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KEYWORDS

Colorimetry

Confocal microscopy

Sensors

Lens design

Light

Dispersion

Laser development

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