Terahertz has been rapidly developed and applied in the field of non-destructive testing because of its features such as perspective and safety. Ceramic devices have the advantages of high-temperature resistance and fatigue resistance and are now widely used in various fields. But at the same time, the ceramic device will have debonding defects due to process quality and environmental problems during the preparation process, which greatly reduces its performance. In this paper, terahertz time-domain spectroscopy is used to image defects in ceramics. Firstly, the optical parameters of ceramics are extracted by transmission terahertz time-domain spectroscopy, and then the defects of ceramics are imaged by maximum imaging, time-of-flight imaging, peak-to-peak imaging, and peak-to-peak time imaging. The defect image obtained by the imaging method is clearer. The type and size of defects can be further obtained by using the terahertz time-domain imaging method, which is an effective method to ensure the quality and safety of devices.
Precision ceramic bonded structural parts have an irreplaceable position in the aerospace business and are widely used in various industries due to their various advantages, but at the same time, the uneven thickness of the adhesive layer will affect the quality of ceramic adhesive structural par. In this paper, terahertz time-domain spectroscopy is used for nondestructive detection of the adhesive layer inside the sample, and the thickness information is reconstructed from the experimental data using an autoregressive spectral extrapolation method based on improved covariance, and the difference in the time of flight of the echoes on the upper and lower surfaces of the adhesive layer is used to find the thickness of the adhesive layer. This paper analyzes the thickness of the adhesive layer of 0.5mm and 1mm respectively, and finally gets the error rate of 7.2% and 6.3%. This error rate is basically in line with the quality of the product and provides reliable technical support for the aerospace business.
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