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Asbestos real-time monitor in an atmospheric environment

机译：大气环境中的石棉实时监控器

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The concentration of asbestos fiber aerosols can be monitored by measuring the polarization of laser light scattered by asbestos fibers. The principle of discriminating asbestos fibers is based on the theoretically expected difference in polarization at a scattering angle of 170 deg between cylindrical and spherical airborne particles; polarization at this scattering angle should be positive for cylindrical particles such as asbestos fibers but should be negative or close to zero for spherical mineral particles. We constructed an experimental asbestos real-time monitor that uses a strong electric field to align the airborne particles, that uses lasers having Linear polarization with an equal amplitude in parallel and perpendicular components to the aligned long axis of particles, and that simultaneously detects the two components of the Linear polarization of light scattered at 170 deg, i.e., close to the backscatter. Experiments that were performed to detect the light scattered from airborne standard asbestos fibers showed that the measured polarization fits theoretical prediction. The concentrations of airborne asbestos fibers obtained by the asbestos real-time monitor were consistent with those estimated by the standard phase contrast microscope method. (C) 1997 Optical Society of America.
机译：可以通过测量由石棉纤维散射的激光的偏振来监测石棉纤维气溶胶的浓度。区分石棉纤维的原理是基于圆柱状和球形空气传播颗粒之间在170度散射角时的理论上的偏振差异。在此散射角下，极化对于圆柱形颗粒（如石棉纤维）应为正，但对于球形矿物颗粒应为负或接近零。我们构建了一个实验性石棉实时监测器，该监测器使用强电场来对准气载粒子，它使用具有线性偏振且与粒子的长轴平行且垂直的分量具有相等振幅的线性偏振的激光，并且同时检测这两个在170度（即接近背向散射）处散射的光的线性偏振的分量。为检测从机载标准石棉纤维散射的光而进行的实验表明，测得的偏振符合理论预测。通过石棉实时监控器获得的空气中石棉纤维的浓度与通过标准相差显微镜法估算的浓度一致。 （C）1997年美国眼镜学会。

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