Mr. Chunsheng Chen Profile

Chunsheng Chen

at Research Institute of Chemical Defence

SPIE Involvement:

Author

Publications (4)

Proceedings Article | 24 October 2017 Paper

Calculation of color difference and measurement of the spectrum of aerosol based on human visual system

Mengyan Dai, Jianghai Liu, Jianlin Cui, Chunsheng Chen, Peng Jia

Proceedings Volume 10461, 104610X (2017) https://doi.org/10.1117/12.2284666

KEYWORDS: Color difference, Aerosols, Visual system

Read Abstract +

Proceedings Article | 20 November 2014 Paper

Comparison and analysis on test methods of infrared radiant intensity of infrared decoy

Chunsheng Chen, Mengyan Dai, Haifeng Liu, Guofeng Fang, Changyou Xie, Tong Zhang

Proceedings Volume 9300, 93000K (2014) https://doi.org/10.1117/12.2070681

KEYWORDS: Thermography, Infrared radiation, Error analysis, Infrared imaging, Mid-IR, Black bodies, Calibration, Infrared detectors, Target recognition, Infrared sensors

Read Abstract +

The research on infrared radiant characteristics of typical target is important for the detection and recognition of target, infrared simulation calculation and design of electro-optical countermeasures. Thus it is essential to select appropriate test method and optimal calculation method to improve the test accuracy and reliability of infrared radiant intensity. In this paper, three instruments including SR5000 spectroradiometer (CI, MigdalHaEmek, Israel), remote sensing interferometer spectrometer Tensor37 (Bruker, Germany) and Image IR8325 (InfraTec Ltd, Germany) mid-infrared thermal imager were applied to test the infrared radiant (1μm-3μm，3μm-5μm) intensity of decoy samples. Three methods were designed based on two operational principles including direct test and indirect test. The SR5000 spectroradiometer which is able to obtain the value of radian intensity immediately is regard as direct test. The other two instruments which deduce and calculate infrared radiant intensity according to Planck's law and Lambert's cosine law with some preliminary tested parameters such as the response voltage，the distribution of infrared radiant temperature of flaming samples and calibrated data by blackbody, however, are regard as indirect test. Reasons for the diversity of experiment results were provided through analysis on the concrete measurement theory and detailed calculation methods. Moreover, some rules and suggestions were put forward to improve the test accuracy and reliability of infrared radiant intensity when different methods were adopted. It is shown from experiment results that the average mid-infrared radiant intensity obtained from SR5000 was about 903W/Sr in near-infrared band，whereas Tensor 37 and Image IR8325 was about 834W/Sr and 547 W/Sr respectively. It was proved that maximum relative of calculated results from remote sensing interferometer spectrometer Tensor37 and results measured with SR5000 spectroradiometer is below 13%, which meet the general accuracy requirements. Although rigorous reasoning applied, results gained by Image IR8325 mid-infrared thermal imager varied so much from above-mentioned two instruments and the relative error is about 25%~40%. It is analyzed that complexity of the measurement procedure and similarity hypothesis is the main reason for the errors generated.

Proceedings Article | 11 September 2013 Paper

Research of influence of oxidant on the photoelectric obscurity of artificial fog

Meng-yan Dai, Xiang-cui Liu, Hai-feng Liu, Chun-sheng Chen, Tong Zhang

Proceedings Volume 8907, 89073N (2013) https://doi.org/10.1117/12.2034065

KEYWORDS: Fiber optic gyroscopes, Aerosols, Infrared radiation, Signal attenuation, Visible radiation, Combustion, Sensors, Atmospheric particles, Infrared imaging, Refractive index

Read Abstract +

Many investigations show that almost all detection systems operating in visible light and infrared wave bands are subject to severe performance degradation when they are used in fog. It is necessary to study the influence of fog on the photoelectric sensors so as to find out applicable countermeasures. However, it is hard to get enough meaningful data tested in nature fog. If the forming of fog can be controlled artificially, more credible research methods and experiment conditions will be acquired for studying the electromagnetic wave transmission in fog. In this paper, artificial fog was produced with the fog aerosol specially prepared with oxidant, fuel and bond. Through combustion reaction, the fog aerosol could generate artificial condensation nucleuses, which were provided with fog catalyzing capabilities and able to condense water vapor in air and produce artificial fog within several minutes. Three types of fog aerosols of different oxidant (code-named as NP/KP/LP) were prepared for the experiments. And the influence of oxidant on the photoelectric obscurity performance and the microphysical characteristics of artificial fog were researched. The photoelectric obscurity performance was tested by an IR imaging sensor and an illuminometer sensor, and the microphysical characteristics were tested by the laser granularity system. The experiment results showed that the artificial fog had good photoelectric obscurity and aerosol LP had the best. The attenuation of visible light and infrared wave band (3～5μm) in the fog were above 90%; and the attenuation of infrared wave band (8～14μm) was above 80%. Moreover, the oxidant affected closely the microphysical features of the condensation nucleus, such as the size distribution and number density. It is noticeable that while the size distributions of droplets presented similar trajectories even with different fog aerosols, the coagulation and growth rates of droplets were controlled by the fog catalyzing capabilities of condensation nucleus. Obviously, the maximal droplet concentration and the highest droplet growth rate were obtained form aerosol LP, from which, therefore, the fog catalyzing capability was the best. In conclusion, the oxidant of the fog aerosol greatly affects the catalyzing capabilities of nucleuses and the droplets growth processes, and consequently leads to the difference of photoelectric obscurities.

Proceedings Article | 11 September 2013 Paper

Dispersion and infrared jamming performance of hollow nanoshell smoke

T. Zhang, X. D. Dai, L. N. Ren, L. Chen, M. Y. Dai, X. C. Liu, Y. Jiang, C. S. Chen, H. F. Liu

Proceedings Volume 8907, 89073L (2013) https://doi.org/10.1117/12.2034024

KEYWORDS: Infrared radiation, Particles, Signal attenuation, Atmospheric particles, Transmittance, Thermography, Scanning electron microscopy, Quantum cascade lasers, Infrared lasers, Infrared imaging

Read Abstract +

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years