Barrett H H, Demeester G D
Appl Opt. 1974 May 1;13(5):1100-9. doi: 10.1364/AO.13.001100.
A Fresnel zone plate, used as a coded aperture, offers a great advantage in geometric collection efficiency over a conventional pinhole or collimator. We present a detailed analysis of the signal-to-noise ratio (SNR) of a quantum-limited zone plate camera. The magnitude and spatial distribution of the noise field and its dependence on the source distribution and the characteristics of the optical processing system are derived. It is shown that the largest SNR advantage occurs for a point source, while for very large, uniform sources there may be a slight net disadvantage to using a zone plate. It is also shown that optical processing does not give the highest possible SNR.
作为编码孔径使用的菲涅耳波带片，在几何收集效率方面比传统针孔或准直仪具有很大优势。我们对量子极限波带片相机的信噪比（SNR）进行了详细分析。推导了噪声场的大小和空间分布及其对源分布和光学处理系统特性的依赖性。结果表明，对于点源，信噪比优势最大，而对于非常大的均匀源，使用波带片可能会有轻微的净劣势。还表明，光学处理并不能给出可能的最高信噪比。
