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Evaluation of correction algorithm for the Reflectance Measured with Optical Glass

Journal of Donghua University(English Edition) 2003年第2期20卷 52-55页

作者：车江宁周志华陈东辉 School of Graduate Donghua University Shanghai 200051 School of Graduate Donghua University Shanghai 200051he proposed algorithm for reflectance measured with optical glass has been verified with materials of various forms. The reflectances measured with optical glass ( raw) without glass (true) and corrected by the algorithm are compared. The results show that the corrected reflectance agrees very well with true one and their color differences fall below the acceptable limit which indicates the validity of the correction algorithm. The algorithm could be used not only for fiber-forming materials but also for powder-forming granulate-forming etc.

The proposed algorithm for reflectance measured with optical glass has been verified with materials of various forms. The reflectances measured with optical glass ( raw), without glass (true) and corrected by the algorithm are compared. The results show that the corrected reflectance agrees very well with true one and their color differences fall below the acceptable limit, which indicates the validity of the correction algorithm. The algorithm could be used not only for fiber-forming materials, but also for powder-forming, granulate-forming, etc.

关键词： correction algorithm Reflectance Optical Glass

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A passive synthetic aperture phase correction algorithm for the asymmetric twin-line array sonar

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Chinese Journal of Acoustics 2007年第4期26卷 337-344页

作者： LI Yu ZHANG Yangfan HUANG Haining LI Shuqiu LI Qihu ZHANG Chunhua Institute of Acoustics The Chinese Academy of Sciences Beijing 100080

A passive synthetic aperture based on phase correction algorithm for solving the port-starboard discrimination problem in the non-aligned towed twin-line array sonar, is described. This method creates a virtual array through applying the estimated phase correction into one array of twin-line arrays. Because the synthetic virtual array is aligned with the other array in twin-line arrays, the right port-starboard discriminated results can be obtained by array processing based on the new synthetic twin-line array. The effect of proposed method has been shown by simulated and sea-trials results in towed twin-line array sonar. With low extra computational loads, the proposed method is easy to apply to the practice.

关键词： correction algorithm synthetic aperture

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Wavelength Dispersion Analysis on Fiber-Optic Raman Distributed Temperature Sensor System

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Photonic Sensors 2013年第3期3卷 256-261页

作者： Weijie WANG Jun CHANG Guangping LV Zongliang WANG Zhi LIU Sha LUO Shuo JIANG Xiangzhi LIU Xiaohui LIU Yongning LIU School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application Shandong University Jinan 250100 P. R. China Institute of Automation Shandong Academy of Sciences Jinan 250014 China

The influence of the wavelength dispersion on the temperature accuracy of the Raman distributed temperature sensor system （RDTS） is analyzed in detail, and a simple correction algorithm is proposed to compensate the fiber position error caused by the wavelength dispersion. The principle of the proposed algorithm is described theoretically, and the correction on each point along the entire fiber is realized. Temperature simulation results validate that the temperature distortion is corrected and the temperature accuracy is effectively improved from ＋5 ℃ to ±1 ℃.

关键词： Distributed temperature sensor wavelength dispersion correction algorithm

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A Novel Method for Wet Gas Flow Measurements Based on an Over-Reading Principle

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Fluid Dynamics & Materials Processing 2023年第2期19卷 303-313页

作者： Jinjing Zhang Jia Li Shanghai Vocational College of Agriculture and Forestry Shanghai201699China

A novel method to measure the flow rate in a wet gas is *** to the presence of liquid,there is a deviation in the measurement of the gas volume flow rate obtained with standard vortex *** proposed method is based on a correction factor determined through the application of an over-reading approach to a bluff body in mist *** correction factor is obtained from the slip velocity ratio,i.e.,the ratio of droplet velocity to gas velocity,based on the analysis of the fluid velocity distribution in the pipeline *** also takes into account relevant theoretical *** is shown that the predicted results fit the experimental results well.

关键词： Over-reading flow measurement correction algorithm

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Rayleigh-backscattering Doppler broadening correction for differential absorption lidar

Rayleigh-backscattering Doppler broadening Correction for di...

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国防光电子论坛第二届激光雷达成像探测技术及应用研讨会

作者：范兰兰 Yinchao ZHANG Si-ying CHEN Pan GUO He CHEN Key Laboratory of Photo-electronic Imaging Technology and System Beijing Institute of Technology

The spectral broadening by Rayleigh backscattering can cause large changes in water vapor echo signals, causing errors when the water vapor concentration is inversed by differential absorption lidar(DIAL). A correction algorithm is proposed to revise the errors due to the effect of laser spectral broadening. The relative errors of water vapor are calculated in cases of different aerosol distribution and temperature changes before and after correction. The results show that measurement errors due to the Doppler broadening are more than 5% before correction and a 2% measurement error after corrected for the case of a smooth, background aerosol distribution. However, due to the high aerosol gradients and strong temperature inversion, errors can be up to 40% and 10% with no corrections for this effect, respectively. The relative errors can reduce to less than 2% after correction. Hence, the correction algorithm for Rayleigh Doppler broadening can improve detection accuracy in HO DIAL measurements especially when it is applied to high aerosol concentration or strong temperature inversion.

关键词： Atmospheric optics Doppler broadening Rayleigh backscattering correction algorithm Range-resolved DIAL Water vapor remote sensing

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