Lock-In Thermography Based on an Optical Chopper
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摘要: 由于大功率热源通常具有启动慢和热惯性大等特点，很难实现高频周期性的调制。提出了采用红外卤素灯阵列结合光学斩波器的方法，实现对热激励源的高频率周期性调制。在此基础上，研制了一款新型的基于卤素灯阵列的锁相热波成像系统。该系统既可以对热源进行宽频率范围的周期性调制，从而进行锁相热波成像，也可以实现长周期的单脉冲热波成像检测。进行了几种样品的锁相热波成像试验，结果表明：采用4 Hz的锁相频率可以检测太阳能电池片的黏接质量；而采用0.01 Hz的锁相频率可以检测出碳纤维复合材料中深度为4.7 mm处的缺陷。Abstract: The high power heat sources are very slow in response to the power modulation. Therefore such system is not used for applications with very high modulation frequency. A new thermography system is developed that combines an optical chopper with an infrared lamp array to realize higher frequency power modulation. This system not only has the benefit of broader modulation frequency range for lock-in thermography, but also can serve as a pulsed mode thermographic system with fast power cut off. Experiments are carried out to verify the system's capability. The results show that at 4 Hz lock-in frequency, it can effectively inspect thin solar wafer adhesion quality, and with 0.01 Hz lock-in frequency, it can furthermore detect defects of 4.7 mm depth.
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Keywords:
- lock-in thermography /
- thermal wave imaging /
- infrared modulation
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