Terahertz 3D detection imaging of ceramic pen holder

Based on terahertz frequency modulated continuous wave nondestructive testing system, a ceramic pencil holder was studied. Different types of defects are designed on the outer wall of the ceramic pen holder. By using the high penetration and non-destructive characteristics of terahertz waves, the time domain, height and rotation angle information are obtained by scanning the ceramic pen holder in an all-round and multi-angle manner, and high-resolution three-dimensional terahertz images are constructed. At the same time, the processing technology of noise reduction is used to optimize the terahertz images. These images can accurately reveal the tiny defects on the ceramic surface, so as to improve the precision and efficiency of product quality control. Finally, the detection of ceramic pencil holder defects by terahertz frequency modulated continuous wave was realized.