Meng H, Hussain F
Appl Opt. 1995 Apr 10;34(11):1827-40. doi: 10.1364/AO.34.001827.
Prior approaches (e.g., off-axis holography) to overcoming the limitations of in-line holography for particle fields, namely, intrinsic speckle noise and depth resolution, involved an increased complexity of the optical system. The in-line recording and off-axis viewing (IROV) technique employs a single laser beam to record an in-line hologram, which is then viewed off axis during reconstruction. The signal-to-noise ratio and depth resolution of IROV are higher than conventional in-line holography by an order of magnitude and are comparable with off-axis holography. IROV is a much simpler approach than off-axis holography and is highly promising for holographic particle velocimetry. Measurements of the three dimensional flow velocity field of a vortex ring obtained by an IROV-based holographic particle velocimetry system are presented.
先前为克服同轴全息术在粒子场方面的局限性（即固有散斑噪声和深度分辨率）所采用的方法（例如离轴全息术），涉及光学系统复杂度的增加。同轴记录离轴观察（IROV）技术使用单束激光记录同轴全息图，然后在重建过程中离轴观察该全息图。IROV的信噪比和深度分辨率比传统同轴全息术高一个数量级，并且与离轴全息术相当。IROV是一种比离轴全息术简单得多的方法，在全息粒子测速方面极具前景。本文展示了通过基于IROV的全息粒子测速系统获得的涡环三维流速场的测量结果。
