Perciante C D, Ferrari J A
Appl Opt. 2000 May 1;39(13):2081-3. doi: 10.1364/ao.39.002081.
We describe a simple method for visualization of phase objects. The phase object is placed between a printed two-dimensional periodic pattern and a CCD camera. The ray deflection that is due to the phase object distorts the image of the pattern. This image is subtracted from a reference image and then, by squaring and low-pass filtering, a measurement of the two-dimensional refractive-index changes is obtained. Because the optical system does not require special alignment or illumination, the method presented has potential application for detection of gas leaks in industrial environments.
我们描述了一种用于可视化相位物体的简单方法。将相位物体放置在印刷的二维周期性图案和电荷耦合器件（CCD）相机之间。由相位物体引起的光线偏转使图案的图像变形。从参考图像中减去该图像，然后通过平方和低通滤波，获得二维折射率变化的测量值。由于该光学系统不需要特殊的对准或照明，所提出的方法在工业环境中气体泄漏检测方面具有潜在的应用价值。
