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Optical scattering (TAOS) by tire debris particles: preliminary results

Giovanni F Crosta, Marina CCamatini, Simeone Zomer, Stephen Holler, Yongle Pan, Praveena Bhaskara, Pongphisanu Muangchareon, Changmo Sung, Simone Cencetti, and Claudia Regazzoni

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Abstract

Tire debris particles from low severity laboratory wear tests have been investigated by the TAOS optical scattering facility at Yale University. The incident wavelength is 532 nm. After the TAOS event some particle samples have been imaged by a scanning electron microscope and microanalyzed. The TAOS intensity patterns recorded within a solid angle in the backward sector have been processed by cluster analysis and compared with the patterns computed by a T-matrix code. Preliminary agreement has been found between TAOS data and the particle models (size, shape, refractive index). The purpose of the investigation is to obtain signatures of the material, based on its TAOS pattern.

©2001 Optical Society of America

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Figures (7)
Fig. 1.
Fig. 1. (a) Triggering and TAOS optics; (b) the reference frame; (c) the ABBE sine condition.

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FIGURE 2.
FIGURE 2. TAOS pattern produced by a PS sphere of nominal radius=5 µm (psl10b1b). The intensity scale, in arbitrary units, is the same for all TAOS images.

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FIGURE 3.
FIGURE 3. TAOS pattern produced by particle LS01 of material b.

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FIGURE 4.
FIGURE 4. TAOS pattern produced by particle LS04 of material b.

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FIGURE 5.
FIGURE 5. SE micrograph of particle yfa2, material b.

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FIGURE 6.
FIGURE 6. SE micrograph of particle yfa6.

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FIGURE 7.
FIGURE 7. Rounded cone Th14Sj (height 1.4 µm, Im[m]=0.1) and its scattering pattern inΩ. . The pattern fits in cluster # 1. From G.F. Crosta, S. Zomer, Numerical Simulation of Forward Obstacle Scattering, http://web.tiscalinet.it/_TAOS/index.html

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Tables (1)

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Table 1. Normalized peak intensities above background of the elements detected in material b Values normalized separately, for each particle, with respect to that Kα peak, which exhibits the highest intensity. Neither Ca nor Fe could be detected in any particle. ND=not detectable.

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