A contact type optical fiber probe precision aperture measurement method and measurement system based on inflection point identification

By using an inflection point identification-based method, combined with kernel density estimation and adaptive inflection point localization, nonlinear data is eliminated, thus solving the error caused by the pre-contact effect in contact fiber optic probe measurement and achieving high-precision and robust aperture measurement.

CN122149346APending Publication Date: 2026-06-05HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH
Filing Date
2026-03-21
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing contact fiber optic probe measurement technology, when performing high-precision measurements, is affected by microscopic forces such as surface van der Waals forces and pre-contact effects caused by microscopic elastic deformation of the probe mechanism. This results in inaccurate signal transition points, uncertainties in pre-travel, and non-ideal signals, making it difficult to accurately identify the true contact point.

Method used

A method based on inflection point identification is adopted. The contact platform is adaptively determined by kernel density estimation. Combined with adaptive inflection point precise positioning and dynamic first and last noise reduction processing, nonlinear data is eliminated, and piecewise linear fitting is performed to calculate the aperture.

Benefits of technology

It significantly improves the robustness and accuracy of contact fiber optic probe measurements, enabling automated precision measurements applicable to different materials and apertures, overcoming the effects of pre-contact effects, and improving measurement repeatability and accuracy.

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Abstract

A contact type optical fiber probe precision aperture measurement method and measurement system based on inflection point identification. It includes: S1. Find the maximum diameter of the measured hole; S2. The position data of the probe and the data of the corresponding light strip centroid are collected synchronously; S3. The data is preprocessed; S4. The position interval of the light strip centroid when the probe freely moves in the hole is screened; S5. Adaptive inflection point accurate positioning and data segmentation are carried out; S6. Dynamic head-tail denoising processing is carried out; S7. Piecewise linear fitting and intersection calculation are carried out. The application has strong identification robustness: the stable contact platform is adaptively determined by kernel density estimation, which completely avoids subjective threshold setting and is not sensitive to the overall shift and fluctuation of the signal. The "three-section head-tail denoising" mechanism specially eliminates the nonlinear data generated by mechanical inertia and elastic deformation at the moment of probe contact or separation, significantly improves the accuracy of linear fitting, so that the contact point of the probe and the small hole can be accurately positioned, and the measurement precision of the small hole diameter is improved.
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