In this paper

shearography and thermography have been used in detecting inner defects of the fiber reinforced resin matrix composite fairing shell. Shearography and infrared thermography are contactless nondestructive testing methods based on distinct disciplines. Under the same thermal excitation

these two methods are able to be applied to nondestructive testing. In this study

an image fusion technique has been proposed to expand the dynamic range of digital camera to meet the requirement for smooth surface of the fairing shell. Based on a low-cost thermography setup

a phase enhancement scheme has also been developed for on-situ nondestructive evaluation. Shearography and infrared thermography have been conducted on the fairing by means of thermal excitation. The experimental results show that the proposed fusion method is helpful in dealing with the uneven distribution of light intensity due to laser illumination and surface condition; and the infrared phase enhancement scheme greatly improves the visibility of defects. These two methods possess individual advantages. Based on the experiment

an assessment about these two optical methods is conducted

which provides valuable experiences in subsequent  defect detections.