1Industrial CT testingEssence of Technology: Integration of Ray Penetration and Digital Reconstruction
Industrial Computed Tomography (ICT) is a non-destructive testing technique based on the penetration characteristics of X-rays or gamma rays. The core principle is:
Ray penetration and attenuation: The radiation source emits high-energy rays that penetrate the object being measured. Substances of different densities and thicknesses have different absorption abilities for the rays, resulting in a decrease in radiation intensity.
Data collection: When an object rotates or a radiation source/detector moves, attenuated radiation signals are collected from multiple angles to form a large amount of projection data.
3D reconstruction: By using filtering and backprojection algorithms, 2D projection data is converted into 3D tomographic images, ultimately generating a digital twin model of the object's interior.
Technical advantages:
Non destructive: No need to disassemble or destroy samples, suitable for testing precious cultural relics, expensive components, or non reproducible structures.
High resolution: The spatial resolution can reach micrometer level, which can clearly present small defects such as cracks, pores, and looseness.
Quantitative analysis: It can measure the size, location, and material density distribution of internal defects, providing data support for quality control.
Strong penetrability: It can detect high-density substances such as metals, composite materials, ceramics, etc. The maximum thickness of penetrating steel can reach several hundred millimeters.
IIIndustrial CT testingTechnology Category: Adaptation of Energy and Scenarios
According to the energy of the radiation source and detection requirements, industrial CT can be divided into the following types:
| type | Energy Range | Application scenarios |
| Low energy industrial CT | 10-300 keV | Micro component inspection (such as electronic components, BGA packaging), material porosity analysis, reverse engineering. |
| High energy industrial CT | >1 MeV | Large scale workpiece inspection (such as aircraft engine blades, solid rocket fuel), and internal structure analysis of high-density materials. |
| Microscopic CT | Micro focal point shooting line source | High precision imaging of biological samples, geological rock cores, and micro/nano structures with resolutions up to sub micron level. |
Key performance indicators:
Spatial resolution: The ability to distinguish the smallest structural details from CT images, influenced by the focal size of the radiation source and the pixel size of the detector.
Density resolution: The ability to distinguish the minimum density difference, usually expressed as a percentage, affecting the identification of low concentration inclusions.
Geometric measurement accuracy: The absolute error between the measured dimensions on CT images and the actual dimensions must meet the tolerance requirements of precision manufacturing.
Scanning speed: Single layer scanning time varies from a few seconds to several hours, and high-precision detection requires longer time.
3、 Application scenario: Full coverage from laboratory to production line
Industrial CT has penetrated into all aspects of the manufacturing industry and become the 'ultimate solution' for quality control:
aerospace
Engine blade inspection: Identify internal cracks, air holes, and other defects to ensure flight safety.
Composite material analysis: detecting the fiber orientation and interlayer debonding of carbon fiber materials to optimize material properties.
automobile manufacturing
Metal casting inspection: Quickly locate sand holes and inclusions in key components such as rocking pillows and side frames to reduce failure rates.
Battery safety analysis: detect electrode breakage, electrode alignment, and internal foreign objects in lithium batteries to improve battery life.
Electronics and Semiconductors
Chip packaging inspection: Identify wire detachment and bonding holes to ensure stable chip performance.
PCB board defect analysis: detecting bubbles and virtual soldering during the soldering process to improve circuit reliability.
Materials Science
Porosity measurement: According to VDG P201/P202 standards, analyze the proportion and aggregation of internal pores in castings.
Reverse engineering: Obtaining 3D data directly without disassembling samples, accelerating product restoration or improvement.
Archaeology of cultural relics
Paleontological fossil analysis: non-destructive observation of internal structures to reveal information on biological evolution.
Digital protection of cultural relics: Clearly present the internal assembly and material density of cultural relics to avoid interpretation errors in two-dimensional projection.
4、 Technical Challenges and Development Trends
Current bottleneck
High cost: The price of high-energy industrial CT equipment can reach tens of thousands, which limits its application to small and medium-sized enterprises.
Large data volume: A single scan can generate tens of GB of data, requiring high storage and computing power.
Artifact interference: Metal components are prone to producing circular artifacts, which need to be reduced through algorithm optimization.
Future Direction
Intelligence: Introducing AI algorithms to achieve automatic defect recognition and size measurement, reducing manual intervention.
Portability: Develop miniaturized equipment to meet on-site inspection needs (such as wind turbine blades, bridge structures).
Multimodal fusion: integrating detection methods such as ultrasound and infrared to achieve a "one-stop" comprehensive evaluation.
Localization breakthrough: Domestic enterprises have mastered the technology of core components (such as micro focus radiation sources), and the localization rate is expected to exceed 40% by 2025, driving cost reduction.