Mr. Qiang Lv Profile

Qiang Lv

at Xidian Univ

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Publications (4)

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Proceedings Article | 31 August 2021 Paper

Ultraviolet radiation characteristics of NO in shock layer of hypersonic vehicle

Jie Wang, Lu Bai, Tianjiao Zhang, Qiang Lv, Chaofan Xue

Proceedings Volume 11907, 119070P (2021) https://doi.org/10.1117/12.2601819

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The ultraviolet radiation generated by NO transition in the shock layer of hypersonic vehicle provides an important basis for target detection and recognition. In this paper, direct simulation Monte Carlo (DSMC) method is used to simulate the high temperature flow field of the Apollo aircraft. Based on the temperature, pressure, and mass fraction, SPECAIR software is used to calculate the NO(γ) spectral absorption coefficient, and combined with the line of sight (LOS) method, the ultraviolet radiation produced by the NO(γ) transition along the stagnation line at different heights is calculated. Based on the wall heat flux, the wall energy conservation equation is used to calculate the wall temperature, combined with the Planck's law to calculate the wall radiation, and the influence of the wall catalytic effect on the ultraviolet radiation is studied. The results show that with the increase of the height, the gas pressure and temperature decrease obviously, and the ultraviolet radiation from NO(γ) transition decreases. The wall heat flux calculated by the wall catalytic model is very different. The choice of the wall catalytic model is particularly important when studying the influence of the wall radiation on the ultraviolet radiation.

Proceedings Article | 12 March 2021 Paper

Research on obtaining temperature by using the relative intensity of the hydroxyl radical spectrum in the ultraviolet band

Qiang Lv, Lu Bai, Jinyu Xie, Yankun Wang, Danmeng Zhang

Proceedings Volume 11763, 117630L (2021) https://doi.org/10.1117/12.2585778

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In the plume spectrum of hydrogen-oxygen fuel, the radiation spectrum of hydroxide radical (OH) is an obvious feature in the ultraviolet (UV) band. Since the control temperature can be determined by the relative intensity of a single transition, the Hitran database is used to analyze the OH spectrum structure, then two sets of temperature-sensitive peaks are found, corresponding to the OH (A² Σ,v' = 0→X² Π,v'' = 0) and OH (A² Σ,v' =1→X² Π,v'' =1) transitions, respectively. The law of the two groups of peaks with temperature is analyzed in the temperature range of 600-3300K, and the method of determining the control temperature can be obtained by knowing the relative intensity, which provides a way for the temperature inversion in the ultraviolet band.

Proceedings Article | 15 January 2021 Paper

Deep space point source background infrared radiation signal simulation by IRAS star catalog

Jinlu Li, Lu Bai, Qiang Lv, Penghui Gao

Proceedings Volume 11761, 1176107 (2021) https://doi.org/10.1117/12.2585432

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This paper presents a stellar point source background radiation model based on IRAS catalog, which is used to simulate the stellar background radiation signals of observers at any time of observation and in the field of view at any longitude, latitude and altitude. First, the data of stellar equatorial longitude, equatorial latitude, magnitude, and radiation intensity recorded at the epoch time in IRAS catalog is used to correct the proper motion, precession and nutation, and the coordinate information of the star at the specified time in the coordinate system of equatorial celestial sphere will be obtained. Then, after a series of coordinate conversions, with the occlusion of the line of sight being taken into consideration, the coordinates of the star at the time of observation are converted into the apparent position relative to the observer in the specified scene. On this basis, the infrared irradiance of stars in the specified field of view is calculated based on the radiation intensity data recorded in the star table. The research results have some reference value for the detection and recognition of space objects.

Proceedings Article | 24 December 2020 Paper

Comparison of trapping Rayleigh particles using focused canonical vortex beam and noncanonical vortex beam

Penghui Gao, Lu Bai, Qiang Lv

Proceedings Volume 11608, 1160805 (2020) https://doi.org/10.1117/12.2586303

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We numerically simulate the trapping properties of Rayleigh particles by using focused canonical vortex beam and noncanonical vortex beam. The effects of topological charge and phase distribution of optical vortex on trapping Rayleigh particles are discussed. The results show that when an optical vortex takes different values of topological charge, the focused canonical vortex beam has similar trapping properties of Rayleigh particles: the low refractive index particles can be trapped in two dimensions at the focal point, and the high refractive index particles can be fully stably trapped at a ring of the focal plane. However, when focused noncanonical vortex beam is used to trap Rayleigh particles, for different values of topological charge, the low refractive index particles can be trapped in two dimensions or three dimensions in the focal plane, and the high refractive index particles can be fully stably trapped at several points of the focal plane. Therefore, when focused vortex beam is used to trap Rayleigh particles, the trapping regions and the trapping stability of Rayleigh particles can be adjusted by changing the topologically charge and phase distribution of optical vortex.

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