Landry M J, Phipps G S
Appl Opt. 1975 Sep 1;14(9):2260-6. doi: 10.1364/AO.14.002260.
The holographic characteristics of Agfa-Gevaert Scientia 10E75 have been examined for multiple exposures. They include not only diffraction efficiency, but SNR and resolution as functions of number of exposures, time of development, and/or input modulation (rho'). The maximum diffraction efficiency, occurring at a density of 0.7, was observed to increase with increasing development time and decrease as the number of exposures increased. An approximately 10% decrease in maximum diffraction efficiency was observed for each successive reconstructed image of a multiple exposure hologram. Reconstructed noise was found to be fairly well represented by grain-noise considerations only for the region 0.1 < rho' < 0.4. Elsewhere noise is considerably different from grain-noise predictions. The SNR, at a density of 0.7, was observed to increase from 50 to 85 as the number of exposures increased from one to four. For postexposure or preexposure holograms the maximum signal-to-noise and resolution peaked near an input moduation of 0.4.
已对爱克发 - 吉华公司的Scientia 10E75全息特性进行了多次曝光检测。这些特性不仅包括衍射效率，还包括作为曝光次数、显影时间和/或输入调制（ρ'）函数的信噪比（SNR）和分辨率。在密度为0.7时出现的最大衍射效率，被观察到随着显影时间的增加而增加，随着曝光次数的增加而降低。对于多次曝光全息图的每个连续重建图像，观察到最大衍射效率大约降低10%。仅在0.1 < ρ' < 0.4区域，重建噪声可以通过颗粒噪声考虑得到较好的体现。在其他地方，噪声与颗粒噪声预测有很大不同。在密度为0.7时，随着曝光次数从1增加到4，信噪比从50增加到85。对于曝光后或曝光前全息图，最大信噪比和分辨率在输入调制接近0.4时达到峰值。
