Khmaladze Alexander, Restrepo-Martínez Alejandro, Kim Myung, Castañeda Roman, Blandón Astrid
Department of Physics, University of South Florida, Tampa, Florida 33620, USA.
Appl Opt. 2008 Jun 10;47(17):3203-10. doi: 10.1364/ao.47.003203.
We present a simultaneous dual-wavelength phase-imaging digital holographic technique demonstrated on porous coal samples. The use of two wavelengths enables us to increase the axial range at which the unambiguous phase imaging can be performed, but also increases the noise. We employ a noise reduction "fine map" algorithm, which uses the two-wavelength phase map as a guide to correct a single-wavelength phase image. Then, the resulting noise of a fine map is reduced to the level of single-wavelength noise. A comparison to software unwrapping is also presented. A simple way of correcting a curvature mismatch between the reference and the object beams is offered.
我们展示了一种在多孔煤样品上演示的同步双波长相位成像数字全息技术。使用两个波长使我们能够增加可进行明确相位成像的轴向范围，但同时也增加了噪声。我们采用了一种降噪“精细映射”算法，该算法以双波长相位图为指导来校正单波长相位图像。然后，精细映射产生的噪声被降低到单波长噪声水平。还给出了与软件解缠的比较。提供了一种校正参考光束和物光束之间曲率不匹配的简单方法。
