Abstract
Active infrared (IR) thermography techniques including pulsed thermography, lock-in thermography, pulsed phase thermography, and step thermography have shown great potential. Besides conventional optical thermography, other sources, such as laser, eddy current, microwave, and ultrasound excited thermography, are drawing attention. This chapter mainly includes two sections. In the first section, basic concepts and classifications of active thermography are defined and introduced. The strengths and limitations of several active thermography techniques are concluded through comparison studies. In the second section the principle, history, and classification of eddy current thermography is introduced.
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