Real-time online nondestructive detection device for composite material

Abstract

The invention relates to a real-time online nondestructive detection device for a composite material. The real-time online nondestructive detection device comprises an excitation sound source module, a composite material vibration characteristic detection module, an echo signal optical coherence detection module, a signal orthogonality differential frequency discrimination module and a computer data storage unit, wherein the composite material vibration characteristic detection module comprises an optical fiber laser, a coherence detection optical link and a telescope; output light of the optical fiber laser vertically enters a composite material to be detected through the coherence detection optical link and the telescope; a returned optical signal is returned to the coherence detection optical link through the telescope; an optical signal returned by the optical link is transmitted to the echo signal optical coherence detection module; and the echo signal optical coherence detectionmodule is used for converting the optical signal into an electric signal, and a orthogonal demodulating unit, a differential frequency discrimination unit and a time frequency characteristic analysisunit in the signal orthogonality differential frequency discrimination module are used for processing the electric signal. Due to the adoption of the real-time online nondestructive detection device,the detection distance of nondestructive detection can be enlarged, and the operating safety of the device can be enhanced.

Description

Technical field [0001] The invention relates to the technical field of composite material detection, in particular to a real-time online non-destructive detection device for composite materials. Background technique [0002] As an important tool for the implementation of various large-scale and complex space missions-aerospace vehicles, the materials used in its components have now developed from conventional metal materials to composite materials. The implementation of accurate and effective non-destructive testing for composite materials is not only the basis for material performance evaluation, but also the basis and prerequisite for material structure repair, and it is a key means to ensure the successful launch and safe operation of aerospace vehicles. Because composite materials are a complex multiphase system, materials and structures are formed at the same time and various process parameters are difficult to achieve precise control during manufacturing. Therefore, it is e...

AI Technical Summary

Problems solved by technology

However, the research on real-time online non-destructive testing of composite materials based on coherent laser detection technology is still a research blank.

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