Industrial CT is the abbreviation of industrial computer tomography technology. It can clearly, accurately and intuitively display the internal structure, components, materials and defects of the detected object in the form of two-dimensional tomographic images or three-dimensional images, without damaging the detected object, and is known as the best nondestructive testing technology at present. Industrial CT technology involves nuclear physics, microelectronics, optoelectronics, instrumentation, precision machinery and control, computer image processing and pattern recognition. It is a technology-intensive high-tech product. Industrial CT is widely used in automobile, materials, aerospace, aviation, military industry, national defense and other industrial fields. It is an important means to test the quality of aerospace launch vehicles and spacecraft aero-engines, large weapons, geological structure analysis and mechanical products. The performance index of industrial CT system is 1.

Detection scope: mainly explain the detection object of this ICT. For example, it can transmit the maximum thickness of steel, detect the maximum rotating diameter of workpiece, detect the maximum height or length of workpiece, and detect the maximum weight of workpiece. 2. X-ray source used: X-ray energy, working voltage, working current and focus size. 3. The scanning mode is 3. ICT: What scanning modes are there, and whether there are digital ray detection or real-time imaging functions. 4.

Scanning detection time: refers to the acquisition time of scanning a fault data. 5.

Image reconstruction time: refers to the time required to reconstruct an image. 6.

Resolution: It is a key performance index, including:

Spatial resolution: refers to the ability to distinguish the smallest object from ct images.

Density resolution: it is a basic method to distinguish the material of an object by using the gray level of an image (because gray level directly reflects density).

Relationship between spatial resolution and density resolution. Spatial resolution and density resolution are two contradictory indicators when the radiation dose is constant.