Optical sensor for detecting height profile of surface of object

By introducing a tunable aperture into the receiving unit of the optical sensor, and adjusting the aperture size and shape according to the image parameters, the problems of insufficient detection accuracy and image artifacts of existing optical sensors are solved, and higher detection accuracy and stability are achieved.

CN119642739APending Publication Date: 2025-03-18SICK AG
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Patent Information

Application Number
CN202411301999.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-09-18
Filing Date
2024-09-18
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

When existing optical sensors detect the height profile of the object surface, there is a problem of insufficient detection accuracy, especially when the surface characteristics of the object are changed, image artifacts and detection accuracy are prone to decrease.

Method used

By introducing a tunable aperture into the receiving unit, the size and shape of the aperture is controlled according to image parameters of the projected light (such as image artifacts, depth of field, sharpness, brightness and noise levels), thereby optimizing the brightness of the image and removing unwanted artifacts.

Benefits of technology

The detection accuracy of the optical sensor when detecting the height profile of the object surface is improved, and it can adapt to changes in the surface characteristics of the object, reduce image artifacts, and improve the operation stability and accuracy of the optical sensor.

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Abstract

The invention relates to an optical sensor for detecting at least one height profile of a surface of an object according to the principle of a light splitting method. The optical sensor includes: a light emitter configured to project at least one light ray onto the surface of the object; the receiving unit comprises a light receiver with a receiving element array and a receiving optical device which is arranged on the upstream of the light receiver and is used for generating an image of at least one projection light on the light receiver; and an evaluation unit connected to the light receiver and configured for determining a height profile from the image of the at least one projected light ray recorded by the light receiver. The receiving unit further comprises a tunable aperture associated with the receiving optics and configured to vary the size and / or shape of the aperture of the receiving optics, wherein the evaluation unit is configured to control the tunable aperture according to at least one image parameter of the image of the at least one projected light.
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