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宽容度照相模式射线检测灵敏度分析
蔡闰生1,高红月1,何川龙1,邢文涛1
航天材料及工艺研究所,北京 100076
摘要:
使用穿透电压和较大的曝光量可以增大影像的对比度,进而提高射线检测灵敏度。但为了完成对变截面物体的高效率检测,实践中经常会使用较高的透照电压和较小曝光量这种宽容度照相模式,因此带来了检测灵敏度的降低。为了揭示这个过程中灵敏度的变化情况,引入了透照电压和透照电流相互作用的理论分析,设计了以铝材质为研究对象的宽容度照相灵敏度分析模型,结合数据规划分析,描述出宽容度照相模式下检测灵敏度的变化趋势。从理论上说明了宽容度照相模式可具备相当的检测灵敏度,用实践验证了灵敏度的变化规律。可穿透电压提高40%后,检测灵敏度仍满足相关标准要求。宽容度照相具有可靠的检测灵敏度。
关键词:  宽容度照相  射线检测  灵敏度
DOI:10.12044/j.issn.1007-2330.2019.05.017
分类号:TG115.28+1
基金项目:
Sensitivity Analysis for Radiographic Detection of Tolerance Photography
CAI Runsheng1,GAO Hongyue1,HE Chuanlong1,XING Wentao1
Aerospace Research Institute of Materials & Processing Technology,Beijing 100076
Abstract:
Using the penetrating voltage and the higher level of exposure could enhance the contrast of the image,thereby the sensitivity of radio graphic inspection was improved.But in order to achieve the high efficiency inspection of the variable cross-section objects,the method with the penetrating voltage and the lower level of exposure called latitude camera was normally used,which decreased the sensitivity of inspection.For demonstrating the changing of the sensitivity between those two methods,theoretical analysis of the interaction between trans-illumination voltage and current had been considered.In addition,a latitude camera sensitivity analysis model of aluminum product was designed.Then the data from the model was analyzed to describe the trend of inspection sensitivity in a latitude camera mode.So in theory,the latitude photography mode has considerable inspection sensitivity;and in practice,the changing law of model sensitivity is verified.When the penetrating voltage increases 40%,the inspection sensitivity still meets the relevant standards.As a result,the latitude camera has reliable inspection sensitivity.
Key words:  Latitude camera  Radiographic inspection  Sensitivity