Precise calibration system and method for steel bar detector

By transmitting low-frequency and high-frequency electromagnetic waves for mode decomposition and covariance analysis, generating dual-frequency distortion factors, and performing signal equalization and calibration, the signal distortion problem caused by the electromagnetic lens effect in ancient buildings is solved, and the detection accuracy of the rebar detector is improved.

CN120871271AActive Publication Date: 2025-10-31HANGZHOU ANKE INTELLIGENT CONTROL TECH CO LTD
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Patent Information

Application Number
CN202511332721.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-18
Publication Date
2025-10-31
Estimated Expiration
2045-09-18

AI Technical Summary

Technical Problem

When existing rebar detectors are used to detect ancient buildings, the electromagnetic lensing effect caused by the carbonized layer and corroded rebar leads to distortion of the reflected wave signal, which reduces the detection accuracy.

Method used

By transmitting low-frequency and high-frequency electromagnetic waves, a dual-frequency hybrid echo signal is obtained. Mode decomposition and covariance analysis are performed to generate a dual-frequency distortion factor. Combined with the medium coupling coefficient and the mode adaptation critical value, signal equalization and calibration are performed to eliminate the influence of electromagnetic lensing effect.

Benefits of technology

It achieves precise calibration for steel bar detection in ancient buildings, eliminates signal refraction, scattering, and phase shift caused by electromagnetic lens effect, and improves detection accuracy.

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Abstract

The invention relates to the technical field of data calibration, and discloses an accurate calibration system and method for a steel bar detector, and the system comprises a detection unit, a calculation unit, an analysis unit, a balance unit and a calibration unit. The calculation unit firstly decomposes the signal mode to obtain a double-main-mode response vector and a secondary-mode cooperative value, and then calculates a double-frequency distortion factor in combination with parameters such as an interlayer variable amplitude value and a cooperative abnormal interlayer rate, so that the intensity of the electromagnetic lens effect can be quantized, and a mode adaptation critical value obtained by the analysis unit can provide a judgment basis for signal calibration, so that the accuracy of the signal calibration is improved. The signal equalization coefficient of the equalization unit can determine the direction of signal calibration, and finally the calibration unit carries out superposition calibration on the dual-frequency signal component based on the signal equalization coefficient in combination with parameters such as the dual-frequency layer domain superposition degree and the medium adaptation superposition adjustment amount, thereby effectively correcting signal distortion, and realizing accurate calibration of historic building wall steel bar detection.
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