通过斜激光入射反射测量法测量减弱的光散射系数来估算压力

David Abookasis, Daniel Malchi, Dror Robinson, Mustafa Yassin
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引用次数: 0

摘要

压力的连续测量在工业、医学和科学的许多领域都至关重要。其中,以非侵入式和非接触方式测量压力的能力尤为重要。这项工作展示了斜入射反射仪 (OIR) 通过减小散射参数 (μs′)来监测压力变化的潜力。压力会使介质的几何形状发生变形,并导致其内部结构和光学特性的空间分布发生扭曲。光散射与介质的形态(大小、密度、分布等)和折射率分布有关,施加的压力将直接影响这些参数。因此,我们认为可以通过监测降低的散射系数来定量评估压力。为此,我们采用了 OIR 技术来评估压力变化时的散射参数。OIR 是一种简单的非侵入式非接触成像技术,能够量化样品的吸收和散射特性。在我们的装置中,介质被一束窄激光斜射,漫反射光被 CCD 相机捕获。在离线处理过程中,对漫射光中心与入射点的偏移 (δ)进行数学分析,并提取出 μs′ 系数 (μs′∼δ-1)。在此,我们通过在不同压力水平下对浑浊液体和人体动脉闭塞进行的一系列实验结果,证实了这一假设的正确性。因此,μs′有可能成为监测压力的良好指标。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pressure estimation via measurement of reduced light scattering coefficient by oblique laser incident reflectometry
Continuous measurement of pressure is vital in many fields of industry, medicine, and science. Of particular interest is the ability to measure pressure in a noninvasive and contact-free manner. This work presents the potential of oblique incident reflectometry (OIR) to monitor variation in pressure via the reduced scattering parameter (μs′). Pressure deforms the geometry of the medium and causes distortion of its internal structure and the spatial distribution of optical properties. Light scattering is related to the morphology (size, density, distribution, etc.) and refractive index distributions of the medium, and applied pressure will influence directly these parameters. Therefore, we assume that pressure can be quantitatively assessed through monitoring the reduced scattering coefficient. For this purpose, the technique of OIR to evaluate the scattering parameter during pressure variations was utilized. OIR is a simple noninvasive and contact-free imaging technique able to quantify both absorption and scattering properties of a sample. In our setup, the medium is illuminated obliquely by a narrow laser beam, and the diffuse reflectance light is captured by a CCD camera. In offline processing, the shift (δ) of the diffuse light center from the incident point is mathematically analyzed and μs′ coefficient (μs′∼δ−1) is extracted. We present here confirmation of the validity of this assumption through results of a series of experiments performed on turbid liquid and artery occlusion of a human subject under different pressure levels. Thus, μs′ has the potential to serve as a good indicator for the monitoring of pressure.
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