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The 2011 International Conference on Multi-functional Materials and Structures Engineering (ICMMSE 2011)

作者： Guifeng Li College of Food Science and Engineering Shanxi Normal University

A rapid and nondestructive method for measuring internal browning of apple was put forward based on FT-NIR spectroscopy and the relationship between NIR spectroscopy nondestructive measurement and internal browning was developed. The NIR spectroscopies were acquired from 512 apples. Cluster analysis algorithm based on Euclidean distance was applied to selection of representative samples. The multivariable analysis concluding partial least squares（PLS） and multiple linear regression（MLR） were applied to build the regression models. The excellent model with high R2（0.871） was obtained by PLS based on 3 wavelength ranges（950–1440 nm, 1480–1890 nm, 1960–2300 nm） and with multiplicative scatter correction（MSC） pretreatment. These suggest the model of apple internal browning was reliable with good predict ability and can meet the requirement to quick determination of internal browning of apples.

关键词： FT-NIR spectroscopy nondestructive measurement Apple internal browning Partial least squares(PLS) Multiple linear regressions(MLR)

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Bessel-beam-based side-view measurement of seven-core fibre internal core distribution

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Light(Advanced Manufacturing) 2024年第1期5卷 19-25页

作者： Liuwei Zhan Runze Zhu Hongwei Tong Haogong Feng Kanghu Zhou Fei Xu College of Engineering and Applied Sciences and Collaborative Innovation Centre of Advanced Microstructures Nanjing UniversityNanjing 210093Jiangsu ProvinceChina

Accurate knowledge of the internal core distribution of multicore fibres(MCFs)is essential,given their widespread application,including in fibre splicing,bundle fan-in/fan-out,mode coupling,writing gratings,and fibre ***,the extensive use of MCFs is restricted by the limited methods available to precisely measure the fibre core distribution,as the measurement accuracy determines the performance of the *** this study,a side-view and nondestructive scheme based on Bessel beam illumination was proposed for measuring the internal core distribution of a seven-core *** beams offer a large focal length in a scattering medium,and exhibit a unique pattern when propagating in an off-axis medium with a spatially varying refractive *** results revealed that a long focal length and unique pattern influence the image contrast in the case of Bessel beams,which differs from a typical Gaussian ***,high-precision measurement of a seven-core fibre core distribution based on a Bessel beam was demonstrated using a digital correlation method.A deep learning approach was used to improve the measurement precision to 0.2°with an accuracy of 96.8%.The proposed side-view Bessel-beam-based method has the potential to handle more complex MCFs and photonic crystal fibres.

关键词： Structured light Bessel beam illumination Internal measurement nondestructive measurement

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Online ultrasonic terminal for measuring pig backfat thickness

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International Journal of Agricultural and Biological Engineering 2018年第2期11卷 190-195页

作者： Ganghong Zhang Wanlin Gao Sha Tao Lina Yu Guofeng Zhang Xuan Luo College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China Key Laboratory of Agricultural Informatization Standardization Ministry of AgricultureBeijing 100083China Institute of Semiconductor Chinese Academy of SciencesBeijing100083China School of Microelectronics University of Chinese Academy of SciencesBeijing100049China

The measurement of pig backfat thickness(PBFT)has to stand up to challenges with the reliability,accuracy,and *** PBFT timely and precisely from a finite distance is extremely necessary to improve the process of pig production and implement effective *** an attempt to alleviate these problems,an online handheld terminal was designed with a new method based on ultrasonic technology for measuring PBFT during the process of pig breeding,which can overcome the difficulties encountered in other destructive *** terminal comprised three main components:a main microcontroller unit(MCU)to measure PBFT,a RFID module to identify each pig and send data(***,measurement time and PBFT)to a server via wireless transmission module,and an ultrasonic transducer to drive and receive signals between them.A measurement error within 0-1 mm was acquired through testing three groups of *** indicated that this handheld terminal had a required accuracy and proved that the ultrasonic wave processing method can be deployed in a mobile terminal for PBFT *** also provided a feasible nondestructive alternative to measure *** with information management software platform,this method may ultimately help pig production farmers measure the PBFT accurately and conveniently,and improve the pig production efficiency.

关键词： pig backfat thickness nondestructive measurement ultrasonic technology online terminal pig production

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measurement of sugar content in Fuji apples by FT-NIR spectroscopy

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Journal of Zhejiang University Science 2004年第6期5卷 651-655页

作者：刘燕德应义斌 CollegeofBiosystemsEngineering＆FoodScience ZhejiangUniversityHangzhou310029China

To evaluate the potential of FT-NIR spectroscopy and the influence of the distance between the light source/detection probe and the fruit for measuring the sugar content (SC) of Fuji apples, diffuse reflectance spectra were measured in the spectral range from 12500 to 4000 cm^-1 at 0 mm, 2 mm, 4 mm and 6 mm distances. Four calibration models at four distances were established between diffused reflectance spectra and sugar content by partial least squares (PLS) analysis. The correlation coefficients (R) of calibrations ranged from 0.982 to 0.997 with SEC values from 0.138 to 0.453 and the SECV values from 0.74 to 1.58. The best model of original spectra at 0 mm distance yielded high correlation determination of 0.918, a SEC of 0.092, and a SEP of 0.773. The results showed that different light/detection probe-fruit distances influence the apple reflective spectra and SC predictions.

关键词： FT-NIR spectroscopy nondestructive measurement Sugar content Fuji apples Partial least squares analysis

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INVERSE COMPUTATION OF OPTICAL-ABSORPTION COEFFICIENT IN INHOMOGENEOUS MATERIAL WITH VARIED THERMAL CONDUCTIVITY

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Applied Mathematics(A Journal of Chinese Universities) 2002年第2期17卷 155-163页

作者： Zhu JianxinDept.ofMath.,ZhejiangUniv.,Hangzhou310027,China Dept. of Math. Zhejiang Univ. Hangzhou China

In this paper,for an inhomogeneous material in which the thermal conductivity varies as a function of depth,an efficient treatment is proposed to inversely calculate the depth distri- bution of optical- absorption coefficientby the surface temperature of the *** is demon- strated that the results of inverse computation by that method are more similar to the experi- mental ones measured by some destructive ***,the treatmentis more feasible to non- destructively estimate the distribution.

关键词： nondestructive measurement diode optical- absorption inverse problem mathematical mod- elling

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