Light-field multispectral radiation thermometry has emerged as a promising non-contact technique for twodimensional surface temperature measurement.However,its performance is still limited by temperature inversion alg...Light-field multispectral radiation thermometry has emerged as a promising non-contact technique for twodimensional surface temperature measurement.However,its performance is still limited by temperature inversion algorithms.In this work,we propose LFMP(light-field multispectral physics-embedded network),a physicsinformed neural network framework designed for temperature inversion in light-field multispectral thermography.The framework explicitly incorporates Planck's law and a reference temperature model into its architecture,thereby enforcing physical consistency and enhancing interpretability.展开更多
With the same level of measurement accuracy,more portable and miniaturized measurement systems will have greater advantages,providing users with more flexible and convenient measurement solutions.Here,we introduce a n...With the same level of measurement accuracy,more portable and miniaturized measurement systems will have greater advantages,providing users with more flexible and convenient measurement solutions.Here,we introduce a new type of digital image correlation(DIC)system that incorporates a binocular meta-lens,featuring a simple and compact configuration.Meta-lens is one of the promising flat optical imaging devices that are ultra-thin,customizable,and well-suited for use in confined spaces.We evaluated this binocular meta-lens based DIC(BM-DIC)system through classic in-plane and out-of-plane translation tests,followed by a bending test on a helicopter wing model to capture 3D displacement and deformation fields.For in-plane translations,the system achieved high precision with a standard deviation(σ)below 2μm.Despite a small baseline of 4 mm,the system maintained aσof approximately 32μm for out-of-plane translations.Comparative analysis with conventional dual-camera stereo DIC systems showed that the BM-DIC system maintains an acceptable relative error margin of about 1%in measured strain fields despite a 75-fold reduction in baseline length.This research demonstrates the integration of DIC techniques with advanced meta-lens technology,indicating substantial potential to enhance the capabilities of DIC technology in experimental solid mechanics.展开更多
目的探讨肥胖因素在腰椎后路椎间融合术治疗双节段腰椎退行性疾病中的影响。方法选取2015年1月~2018年12月本院骨科行腰椎后路椎间融合术的双节段腰椎椎间盘退变性疾病患者154例。按照体质量指数(body mass index,BMI)分成三组:BMI<2...目的探讨肥胖因素在腰椎后路椎间融合术治疗双节段腰椎退行性疾病中的影响。方法选取2015年1月~2018年12月本院骨科行腰椎后路椎间融合术的双节段腰椎椎间盘退变性疾病患者154例。按照体质量指数(body mass index,BMI)分成三组:BMI<25 kg/m^(2)纳入正常组,BMI在25.0~29.9 kg/m^(2)纳入超重组,BMI≥30 kg/m^(2)纳入肥胖组。所有患者随访至少1年,比较围手术期指标、VAS评分和ODI指数、植骨融合情况、术后并发症等。结果肥胖组、超重组手术时间显著高于正常组(P<0.05),肥胖组住院时间、并发症发生率显著高于正常组、超重组(P<0.05);三组患者术后3个月、6个月、末次随访时的VAS评分和ODI指数均较术前有显著改善(P<0.05),但组间比较无显著差异(P>0.05);三组的最终融合率接近,无统计学差异(P>0.05)。结论肥胖患者行双节段腰椎后路椎体融合术,其手术时间、住院时间均有增加,术后并发症发生率偏高,但对总体疗效并无显著影响。展开更多
基金National Natural Science Foundation of China(12572325,12172222,22227901,62305184)Basic and Applied Basic Research Foundation of Guangdong Province(2023A1515012932)Science,Technology and Innovation Commission of Shenzhen Municipality(JCYJ20241202123919027)。
文摘Light-field multispectral radiation thermometry has emerged as a promising non-contact technique for twodimensional surface temperature measurement.However,its performance is still limited by temperature inversion algorithms.In this work,we propose LFMP(light-field multispectral physics-embedded network),a physicsinformed neural network framework designed for temperature inversion in light-field multispectral thermography.The framework explicitly incorporates Planck's law and a reference temperature model into its architecture,thereby enforcing physical consistency and enhancing interpretability.
基金financial support from the Research Grants Council of the Hong Kong Special Administrative Region,China(Project No.C5031-22G,CityU11310522,CityU11300123)City University of Hong Kong(Project No.9610628)+5 种基金National Natural Science Foundation of China(NSFC)(12172222,12302368,22227901)National Science and Technology Major Project of China(J2019-V-0004-0095)Science Center for Gas Turbine Project(2023-B-V-002-001)Aeronautical Science Foundation of China(20230046057018)China Postdoctoral Science Foundation(2023M742231)Postdoctoral Fellowship Program of CPSF(GZC20231561。
文摘With the same level of measurement accuracy,more portable and miniaturized measurement systems will have greater advantages,providing users with more flexible and convenient measurement solutions.Here,we introduce a new type of digital image correlation(DIC)system that incorporates a binocular meta-lens,featuring a simple and compact configuration.Meta-lens is one of the promising flat optical imaging devices that are ultra-thin,customizable,and well-suited for use in confined spaces.We evaluated this binocular meta-lens based DIC(BM-DIC)system through classic in-plane and out-of-plane translation tests,followed by a bending test on a helicopter wing model to capture 3D displacement and deformation fields.For in-plane translations,the system achieved high precision with a standard deviation(σ)below 2μm.Despite a small baseline of 4 mm,the system maintained aσof approximately 32μm for out-of-plane translations.Comparative analysis with conventional dual-camera stereo DIC systems showed that the BM-DIC system maintains an acceptable relative error margin of about 1%in measured strain fields despite a 75-fold reduction in baseline length.This research demonstrates the integration of DIC techniques with advanced meta-lens technology,indicating substantial potential to enhance the capabilities of DIC technology in experimental solid mechanics.
