Dr. Fang Gu Profile

Dr. Fang Gu

at Nanjing Univ of Science & Technology

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Author

Publications (5)

Proceedings Article | 27 September 2016 Paper

Design of a photoelectron/ion imaging spectrometer with high temporal resolution

Yuzhu Liu, Yue Guan, Kuang Ao, Shixin Pei, Fang Gu, Jing Su, Linhua Xu

Proceedings Volume 9684, 96840A (2016) https://doi.org/10.1117/12.2243431

KEYWORDS: Spectroscopy, Temporal resolution, Ions, Charged particle optics, Electrodes, Particles, Sensors, Mass spectrometry, Image resolution, Information science

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Proceedings Article | 27 September 2016 Paper

The influence of relative humidity on the scattered light signal of aerosol concentration measurement system

Fang Gu, Jiahong Zhang, Yunyun Chen, Fengpin Cui, Yi Liu, Yuanyuan Wei, Lei Shen

Proceedings Volume 9684, 968404 (2016) https://doi.org/10.1117/12.2243535

KEYWORDS: Humidity, Light scattering, Aerosols, Calibration, Atmospheric particles, Particles, Refractive index, Scattering, Spherical lenses, Atmospheric modeling

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Physical properties, such as density, refractive index and morphology of the aerosol particles will be changed when the relative humidity of the environment is relatively high, which leads to a significant variation of the scattered light signal collected by the single particle light scattering measurement system. If the calibration parameters in the condition of low humidity are applied to inverse aerosol mass concentration, the measurement accuracy will certainly be degraded. Therefore, the calibration parameters of the system must be corrected. In this case, the monotonic relationship between the particle size and the scattered light signal collected by the system should be considered carefully. Combining the Mie scattering theory with the humidity growth model of the particle size and the refractive index, the influence of relative humidity on the scattered light signals of spherical particles has been investigated in this paper. The results indicate that the diameters of spherical particles grow exponentially and the refractive index decreases linearly when the relative humidity is increased between 60% and 95%. Consequently, a significant change of the angular distribution of the scattering intensity occurs. The forward-scattered light is getting stronger, while the back-scattered light becomes weaker. Meanwhile, the scattered light flux of the particle within a solid angle displays exponential growth with increasing the relative humidity. Thus, the monotonous relationship between the particle size and the scattered light flux has changed significantly in the case of the high humidity, and their quadratic coefficient decreases clearly assuming the particle density invariant, which causes an obvious increase of the calibrated proportional coefficient. The results of this work provide an important theoretical guidance for the humidity correction of calibration parameters for the inversion of aerosol mass concentration by the single particle light scattering method.

Proceedings Article | 13 November 2014 Paper

The applications of optical computerized tomography (OCT) in cold and hot complex flow fields

Yun-Yun Chen, Li-zhu Chen, Fang Gu

Proceedings Volume 9279, 927913 (2014) https://doi.org/10.1117/12.2071203

KEYWORDS: Optical coherence tomography, Computed tomography, Tomography, Optical tomography, Argon, Refractive index, Diagnostics, Visualization, Plasmas, 3D displays

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Proceedings Article | 21 January 2008 Paper

A new method of evaluating counting efficiency based on signal amplitude response function

Juan Yang, Fang Gu, Gang Peng, Baomin Bian, Jian Lu

Proceedings Volume 6834, 68342O (2008) https://doi.org/10.1117/12.756200

KEYWORDS: Particles, Atmospheric particles, Optical proximity correction, Sensors, Light scattering, Nonlinear optics, Airborne laser technology, Optical sensors, Aerosols, Statistical analysis

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Proceedings Article | 28 November 2007 Paper

Information entropy characteristic of the light scattering signal amplitude distribution of aerosols

Fang Gu, Juan Yang, Baomin Bian, Anzhi He

Proceedings Volume 6834, 68343G (2007) https://doi.org/10.1117/12.757582

KEYWORDS: Aerosols, Atmospheric particles, Light scattering, Nonlinear optics, Particles, Optical proximity correction, Calibration, Optical sensors, Optical testing, Spherical lenses

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