Guildenbecher Daniel R, Gao Jian, Reu Phillip L, Chen Jun
Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
Appl Opt. 2013 Jun 1;52(16):3790-801. doi: 10.1364/AO.52.003790.
The accuracy of digital in-line holography to detect particle position and size within a 3D domain is evaluated with particular focus placed on detection of nonspherical particles. Dimensionless models are proposed for simulation of holograms from single particles, and these models are used to evaluate the uncertainty of existing particle detection methods. From the lessons learned, a new hybrid method is proposed. This method features automatic determination of optimum thresholds, and simulations indicate improved accuracy compared to alternative methods. To validate this, experiments are performed using quasi-stationary, 3D particle fields with imposed translations. For the spherical particles considered in experiments, the proposed hybrid method resolves mean particle concentration and size to within 4% of the actual value, while the standard deviation of particle depth is less than two particle diameters. Initial experimental results for nonspherical particles reveal similar performance.
评估了数字同轴全息术在三维域内检测粒子位置和大小的准确性，特别关注非球形粒子的检测。提出了无量纲模型来模拟单个粒子的全息图，并使用这些模型评估现有粒子检测方法的不确定性。根据经验教训，提出了一种新的混合方法。该方法具有自动确定最佳阈值的特点，模拟结果表明与其他方法相比准确性有所提高。为了验证这一点，使用施加平移的准静态三维粒子场进行了实验。对于实验中考虑的球形粒子，所提出的混合方法将平均粒子浓度和大小解析到实际值的4%以内，而粒子深度的标准偏差小于两个粒子直径。非球形粒子的初步实验结果显示了类似的性能。
