A method and system for joint detection of temperature and stress using ultrasonic guided waves

Abstract

This invention discloses a method and system for joint detection of temperature and stress using ultrasonic guided waves, belonging to the field of structural health monitoring technology. To address the severe interference from temperature effects in traditional guided wave stress measurements, this invention proposes a joint inversion scheme that requires no external temperature compensation. It includes a guided wave transceiver unit, a signal processing unit, and a temperature-stress joint inversion engine. The core principle is to optimize the operating frequency to maximize the difference in sensitivity to temperature and stress between at least two guided wave modes excited at this frequency; and to simultaneously calculate temperature and stress values ​​using an inversion model trained based on multi-mode propagation parameters at this frequency. This invention also includes a domain randomization strategy for constructing a high-fidelity training database and an online baseline calibration method, effectively improving the model's generalization ability and practical accuracy. The system of this invention has a simple structure, strong anti-interference capability, and can achieve high-precision, in-situ synchronous monitoring of structural stress and temperature under extreme environments.

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