Lens for improving laser triangulation ranging precision

By employing a combination of cemented lenses and biconvex lenses in the laser triangulation system, the problems of spherical aberration and chromatic aberration are solved, improving ranging accuracy and imaging clarity, and achieving high-precision laser triangulation.

CN121832043APending Publication Date: 2026-04-10BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Patent Information

Application Number
CN202511801315.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-02
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

Traditional laser triangulation systems suffer from spherical aberration and distortion due to the use of spherical lenses. This is especially noticeable in large aperture or wide field-of-view scenarios, where the centroid of the light spot drifts, affecting ranging accuracy. Furthermore, the lack of coordinated chromatic aberration correction capability for multi-wavelength beams results in significant dispersion effects during polychromatic light imaging, leading to an increase in spot size and a decrease in sharpness.

Method used

A cemented doublet lens, formed by cementing a first negative meniscus lens and a second negative meniscus lens together, is combined with a biconvex positive lens. Through a multi-level aberration compensation mechanism, the combination of different lens materials is used to correct chromatic aberration and spherical aberration, reduce spherical aberration and edge distortion in imaging, and suppress spot centroid drift.

Benefits of technology

It significantly improves the measurement accuracy and stability of the laser triangulation system, reduces the spot size, and improves the imaging clarity, meeting the needs of high-precision non-contact measurement.

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Abstract

The embodiment of the invention provides a lens for improving laser triangulation ranging precision. In one specific implementation mode, the lens comprises a first negative meniscus lens with the concave surface side facing the object side, a second negative meniscus lens with the concave surface side facing the object side and a biconvex positive lens which are sequentially arranged from the object side to the image side along the optical axis of the lens; and the first negative meniscus lens and the second negative meniscus lens are glued and fixed. According to the embodiment, the first negative meniscus lens and the second negative meniscus lens are glued and fixed. The first negative meniscus lens and the second negative meniscus lens are glued and fixed to obtain the doublet lens, the lens adopts the design of the doublet lens and the single achromatic biconvex lens, the spherical aberration and the edge distortion of imaging can be effectively reduced, the mass center drift of light spots is inhibited, the size of the light spots is reduced, and the imaging definition is improved; therefore, the measurement precision of the laser triangulation ranging method is better improved.
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