Morgan Stephen P
School of Electrical and Electronic Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK.
Appl Opt. 2004 Apr 1;43(10):2071-8. doi: 10.1364/ao.43.002071.
Diffusive wave phased arrays have been demonstrated to be a sensitive method of detecting inhomogeneities embedded in heavily scattering media. However, the increase in sensitivity is coupled with an increase in noise, so that the optimum performance may not be obtained when the sources are modulated in antiphase. The performance of a range of configurations in the presence of Gaussian noise is investigated by using probabilistic detection theory. A model of diffusive wave propagation through scattering media is used to demonstrate that the phase performance can be improved by controlling the relative phase difference between the two sources. However, the best performance is obtained by using the amplitude response of a single source system. The major benefit of a phased array system is therefore the rejection of common systematic noise.
扩散波相控阵已被证明是检测嵌入强散射介质中的不均匀性的一种灵敏方法。然而，灵敏度的提高伴随着噪声的增加，因此当源以反相调制时可能无法获得最佳性能。利用概率检测理论研究了一系列配置在高斯噪声存在下的性能。通过散射介质的扩散波传播模型表明，通过控制两个源之间的相对相位差可以改善相位性能。然而，使用单源系统的幅度响应可获得最佳性能。因此，相控阵系统的主要优点是能够抑制常见的系统噪声。
