A comparison of infrared extinction performances of bioaerosols and traditional smoke materials

Zhao, Xinying; Hu, Yihua; Gu, Youlin; Chen, Xi; Wang, Xinyu; Wang, Peng; Dong, Xiao

doi:10.1016/j.ijleo.2018.12.052

Cited by 17 publications

(4 citation statements)

References 19 publications

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“…A 1 cm thick BaSO4 cylinder was used as a base calibration. In the 2.5μm to 14μm band, a Fourier transform infrared spectrometer with a microscope was used to measure the reflectance and a gold-plating reflective mirror was used as the backgroun [7] . With the measured data of reflection spectra, the CRI of the materials in the 0.2-14μm waveband were calculated by the Kramers-Kronig (K-K) algorithm.The specific calculation process is as follows:…”

Section: Complex Refractive Index Calculation Methodsmentioning

confidence: 99%

Effects of complex refractive index on extinction efficiency factor

Wang

et al. 2023

Advanced Fiber Laser Conference (AFL2022)

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The complex refractive index is an important optical constant, which is usually used to describe some optical properties of absorptive media. The extinction efficiency factor is calculated by the ratio of the extinction cross section of the material particle to the maximum cross-sectional area of the particle. It is numerically equal to the sum of the scattering efficiency factor and the absorption efficiency factor and is often used to characterize the optical attenuation properties of optical attenuation materials. In the present study, the complex refractive index of optical attenuation materials is often calculated by spectral testing and Kramers-Kronig algorithm and the extinction efficiency factor of materials is obtained by calculating the single scattering parameters by discrete dipole approximation. However, the effects of complex refractive index of the optical attenuation material on its extinction efficiency factor have not been studied. It is meaningful to study the effects of complex refractive index on extinction efficiency factor, which can further study the relationship between the attenuation properties of optical attenuation materials and their material properties.

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Section: Complex Refractive Index Calculation Methodsmentioning

confidence: 99%

Effects of complex refractive index on extinction efficiency factor

Wang

et al. 2023

Advanced Fiber Laser Conference (AFL2022)

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“…The relevant data is extracted mainly by analyzing the light transmittance and target shielding images and videos. Zhao Xinying et al [18] conducted transmittance experiments on different smoke screen materials and found that IR extinction performances of three kinds of bioaerosols (AN, AO, and BB spores) in the wavebands of 3-5 μm and 8-14 μm were superior to those of silica, copper, iron, and red phosphorus powders. Hu Yihua et al [3] studied broadband extinction abilities of biological materials in UV, visible and IR light through theoretical calculation and smoke box experiment, and tested several typical biological materials extinction performance within 240nm to 14μm waveband.…”

Section: Extinction Characteristicsmentioning

confidence: 99%

Research progress of biological extinction materials

Chen¹,

Gu²,

Hu³

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

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“…In engineering applications, transmittance and shielding area are important parameters for evaluating the shielding performance of infrared smokescreen. 13,[17][18][19][20] Traditional methods to test the smokescreen transmittance rely on a spectrometer to receive point-to-point target radiation in line of sight, so the field of view is limited to a narrow area due to equipment specifications. 21,22 In the field test, the infrared smokescreen covers a wide area after being released.…”

Section: Introductionmentioning

confidence: 99%

Technique based on the grayscale value for evaluating the shielding performance of infrared smokescreen

Chen,

Hu,

et al. 2024

Opt. Eng.

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Infrared smoke plays a vital role in battlefield photoelectric countermeasures. Transmittance and effective shielding area are crucial indicators in the evaluation of infrared smokescreen shielding performance. The traditional evaluation technique has drawbacks of lacking precision, time consumption, and low automation level. Therefore, an efficient and accurate technique is urgently desired for the evaluation of infrared smokescreen shielding performance in the battlefield environment. We propose a technique based on the grayscale value for evaluating infrared smokescreen shielding performance. First, a description of the field test system is introduced. Second, the transmittance and effective shielding area mathematical models are deduced and constructed. In particular, we discuss the assignment methods of the background and smokescreen grayscale value in the transmittance mathematical model. Finally, the evaluation software is designed, and a field test sample calculation is included to illustrate the procedure of the proposed technique. The results prove to be of enough precision for engineering applications, which is of great significance for engineering guidance.

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A comparison of infrared extinction performances of bioaerosols and traditional smoke materials

Cited by 17 publications

References 19 publications

Effects of complex refractive index on extinction efficiency factor

Effects of complex refractive index on extinction efficiency factor

Research progress of biological extinction materials

Technique based on the grayscale value for evaluating the shielding performance of infrared smokescreen

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