Application Cases

Composite materials are widely used in high-end equipment fields such as aerospace. However, they are prone to defects such as delamination and debonding under high temperatures or complex loads, posing threats to structural safety. Traditional non-destructive testing methods have significant limitations in high-temperature environments, making it difficult to effectively characterize internal defects. Although infrared non-destructive testing technology offers advantages, conventional approaches are constrained by high-temperature thermal noise and insufficient sensitivity for detecting deep-seated defects. This study significantly enhances the detection depth and accuracy of defects in high-temperature environments through the synergistic optimization of linear modulated excitation under temperature field loading and heat conduction laws, providing a new technical pathway for the structural health monitoring of composite materials serving under high-temperature conditions.

Experiment Name: Performance Verification Experiment for Linear Modulated Infrared Non-Destructive Testing of Composite Materials Based on Temperature Field Loading

Experimental Principle:
This study is based on the principle of linear modulated thermal excitation. A halogen lamp outputs linearly modulated thermal waves (frequency range: 0.001–0.015 Hz) to thermally excite the composite material. Differences in thermal properties cause temperature response variations in defective regions, which are captured by an infrared thermal imager. Innovatively, high-temperature environment loading is combined with Fourier phase analysis and principal component analysis (PCA) algorithms to significantly enhance deep defect detection capability and signal-to-noise ratio. Verified through multi-material experiments, this approach achieves the detection of 22 defects at 80°C with a signal-to-noise ratio of 7.18, successfully characterizing millimeter-depth defects. This provides a reliable method for the health monitoring of composite material structures serving under high-temperature conditions.

Experimental Block Diagram:

Experimental Setup Photo:

Experimental Procedure:
This study uses a halogen lamp radiation source to output linearly modulated thermal waves (frequency range: 0.001–0.015 Hz) to thermally excite the composite material specimen, combined with a temperature field loading environment of 20–100°C. An infrared thermal imager is used to capture the thermal response sequence on the specimen surface. Fourier phase analysis and principal component analysis (PCA) algorithms are applied to post-process the thermal image sequence, extracting phase and amplitude features of defects. Experimental results show that at 80°C, 22 defects can be characterized with a high signal-to-noise ratio (7.18), breaking through the detection limit for millimeter-depth defects. This provides an effective method for in-service health monitoring of composite material structures serving under high-temperature conditions.

Application Areas:

• Aerospace thermal protection structure defect detection

• Quality inspection of automotive engine composite material components

• Internal damage assessment of wind turbine blades

• Defect screening of medical implant devices after high-temperature sterilization

Application Scenarios:

• High-temperature infrared non-destructive testing

• Linear modulated excitation

• Composite material defect characterization

• Thermal wave conduction analysis

• High-temperature structural health monitoring

Product Recommendation: ATA-300/3000 Series Power Amplifiers

Figure: ATA-300/3000 Series Power Amplifier Specifications

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