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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[1] 刘波,李艳红,张小川,等.锁相红外热成像技术在无损检测领域的应用[J].无损探伤,2006,30(3):12-15. [2] 徐川,霍雁,李艳红,等.锁相热成像无损检测方法的基础实验研究[J].无损检测, 2007,29(12):728-730. [3] 张炜,刘涛,杨正伟,等.复合材料锁相红外热像法无损探伤技术研究[J].激光与红外,2009,39(9):939-943. [4] KWAE H Y, JU H K, MAN G N, et al. On-power detection of wall-thinned defects using lock-in infrared thermography[J]. Nuclear Engineering and Design, 2014,2(8):542-549.
[5] STRZALKOWSKI K, STREZA M, DADARLAT D, et al. Thermal characterization of Ⅱ-VI binary crystals by photo pyroelectric calorimetry and infrared lock-in thermography[J]. Journal of Thermal Analysis and Calorimetry, 2015,119(1):319-327.
[6] 冯立春,陶宁,徐川. 锁相热像技术及其在无损检测中的应用[J].红外与激光工程,2010,39(6):1120-1123. [7] 赵廷广,郭杏林,任明法.基于锁相红外热成像理论的复合材料网格加筋结构的无损检测[J].复合材料学报,2011,28(1):199-205. [8] 刘俊岩,戴景民,王扬.红外锁相法热波检测技术及缺陷深度测量[J].光学精密工程,2010,18(1):37-44. [9] 程腾,吴健雄,张勇,等.囊体布热合缺陷的锁相热成像无损检测技术研究[J].实验力学,2015,30(5):577-582. [10] 周正干,贺鹏飞,赵翰学,等.钛合金蜂窝结构蒙皮脱焊缺陷锁相红外热成像检测[J].北京航空航天大学学报,2016,42(9):1795-1801. [11] 江海军,陈力.锁相热波成像技术对涂层厚度的测量[J].无损检测,2017,39(4):38-41.
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