Li Jin, Liu Zilong, Liu Si
Appl Opt. 2017 Feb 20;56(6):1616-1624. doi: 10.1364/AO.56.001616.
In on-board photographing processes of satellite cameras, the platform vibration can generate image motion, distortion, and smear, which seriously affect the image quality and image positioning. In this paper, we create a mathematical model of a vibrating modulate transfer function (VMTF) for a remote-sensing camera. The total MTF of a camera is reduced by the VMTF, which means the image quality is degraded. In order to avoid the degeneration of the total MTF caused by vibrations, we use an Mn-20Cu-5Ni-2Fe (M2052) manganese copper alloy material to fabricate a vibration-isolation mechanism (VIM). The VIM can transform platform vibration energy into irreversible thermal energy with its internal twin crystals structure. Our experiment shows the M2052 manganese copper alloy material is good enough to suppress image motion below 125 Hz, which is the vibration frequency of satellite platforms. The camera optical system has a higher MTF after suppressing the vibration of the M2052 material than before.
在卫星相机的机载拍摄过程中，平台振动会产生图像运动、失真和拖影，严重影响图像质量和图像定位。在本文中，我们为遥感相机创建了一个振动调制传递函数（VMTF）的数学模型。相机的总调制传递函数（MTF）会因VMTF而降低，这意味着图像质量会下降。为了避免振动导致总MTF退化，我们使用Mn-20Cu-5Ni-2Fe（M2052）锰铜合金材料制造了一种隔振机构（VIM）。该VIM可以通过其内部的孪晶结构将平台振动能量转化为不可逆的热能。我们的实验表明，M2052锰铜合金材料足以将图像运动抑制到125Hz以下，这是卫星平台的振动频率。在抑制M2052材料的振动后，相机光学系统的MTF比之前更高。
