Non-destructive testing refers to the method of inspecting and detecting the structure, properties, state and defects of wood interior and surface on the premise of not damaging or affecting the use performance of the detected object and destroying the internal organization of the detected object. Wood detection is usually divided into macro detection and micro detection. Microscopic detection generally takes a small sample of wood, and uses instruments or chemical reagents to study the microstructure to judge its wood type or wood properties, while macroscopic detection mainly detects the internal defects, physical properties and structural strength of wood.

The research on nondestructive testing of wood-based panels mainly focuses on internal defect detection, surface defect detection, density detection and moisture content detection. Among them, X-ray method and ultrasonic method are the main methods for nondestructive testing of internal defects, and mature detection technologies and devices have been formed, which have been well applied in actual production.