Design of dispersive objective of chromatic confocal for scratch detection

ZHANG Jin; XIANG Yang; HUANG Lei; DOU Yanhong

doi:10.5768/JAO202344.0501007

Journal of Applied Optics > 2023 > 44(5): 992-997. > DOI: 10.5768/JAO202344.0501007

ZHANG Jin, XIANG Yang, HUANG Lei, DOU Yanhong. Design of dispersive objective of chromatic confocal for scratch detection[J]. Journal of Applied Optics, 2023, 44(5): 992-997. DOI: 10.5768/JAO202344.0501007

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Design of dispersive objective of chromatic confocal for scratch detection

1.
School of Electro-optical Engineering, Changchun University of Science and Technology, Changchun 130022, China
2.
Jilin Key Laboratory of Measuring Instrument and Technology, Jilin Institute of Metrology, Changchun 130103, China

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Received Date: November 14, 2022
Revised Date: January 03, 2023
Available Online: July 23, 2023

Graphical Abstract

Abstract

Abstract

The chromatic confocal displacement sensor has good applicability in the measurement of the scratch depth of the locomotive wheel axle, and the dispersive objective is the key device that determines the detection range and resolution of the sensor. According to the detection requirements, combined with the chromatic confocal principle and linear dispersion conditions, an appropriate initial structure was selected. The Zemax optical design software optimized and analyzed the initial structure, and designed a high-linearity and short-conjugate dispersion lens. The measurement range is 1 mm, the operating spectral range is 400 nm~700 nm, and the spherical aberration of the lens is less than 1.7 μm. The axial displacement resolution of the system is 0.615 μm, the dispersion linearity determination coefficient R² is 0.997 5, and the conjugate distance is 104 mm, which makes the lens miniaturized and has the advantages of high resolution and high linearity.
- scratch detection,
- dispersion objective,
- optical design,
- chromatic confocal

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References (15)

References

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Design of dispersive objective of chromatic confocal for scratch detection