What are the key performance indicators of an industrial CT system?
Industrial CT technology combines a number of technologies such as computer, automatic control, machinery, optical physics, etc., which can ensure that the detected object can obtain the tomographic image of the object without being physically damaged.
An industrial CT system usually consists of a ray source, a mechanical scanning system and an automatic control system, a detector system and a data acquisition system, a computer system, and an auxiliary system. Among them, the core principle of Industrial CT is: the computer controls the ray source to emit the ray beam, the numerical control scanning platform carries the object to be measured, which can be moved or rotated under the control of the computer, and the flat panel detector is responsible for collecting the scanning data; the shielding facility ensures that the radiation does not exceed Finally, the computer reconstructs the industrial CT slice image through the collected projection data, and classifies the defects existing in the image.
Resolution capability is the core performance index of an industrial CT system, including two types: density resolution and spatial resolution.
1. Density resolution:
The ability to minimize density differences can be discerned from CT images. (Generally, the evaluation is based on the size of the feature area)
2. Spatial resolution:
The ability to have the smallest structural details can be discerned from CT images.
The correlation between spatial resolution and density resolution. In the case of a certain radiation dose, the two indicators of spatial resolution and density resolution are contradictory to each other. Increasing the spatial resolution will reduce the density resolution. On the contrary, increasing the density resolution will reduce the spatial resolution.
Spatial resolution and density resolution are the core indicators of ordinary industrial CT systems, but for a high-precision measurement industrial CT system, it not only has the above two core performance indicators, but also has density measurement accuracy and geometry. Measurement accuracy is the two core performance indicators.
