Development and Application of a 160kV Distributed X-ray Tube Based on Carbon Nanotube Cathodes
The development and preliminarily application of a 160kV distributed X-ray tube with multi-ple focal spots based on carbon nanotube cathodes in non-destructive testing are introduced.Based on the Opera-3 D software,simulation and modeling are conducted to arrange multiple focal spots in a linear ar-ray.A structure comprising multiple cathodes,focusing structure array,and anode is designed.The con-stant current emission characteristics of 45 carbon nanotube cathode arrays and the size consistency of each focal points are studied.The anode voltage of the X-ray tube is 160 kV,and the anode current is 15 mA.It can work continuously and stably at a high-power state of 2.4 kW for a long time.When the 45 carbon nanotube cathodes are operating under a constant current state,the difference in control voltage of each cathode can reflect their consistency.The measured standard deviation is 5.2%,and the average focal spot size of the 45 focal spots is 1.09mm×1.22 mm,which is consistent with the simulation calculation re-sults.The standard deviation is 0.02 mm×0.06 mm,indicating good consistency.This distributed X-ray tube operates in a manner of multi focus programmable pulse emission,achieving high-power operation in a smaller focus state.Through line to line card testing,it has high resolution and can perform static tomo-graphy rapid imaging tests from multiple perspectives on small engines,obtaining richer structural infor-mation compared to traditional single point DR detection.
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