Abstract
We propose a method for obtaining the centroid locating accuracy (CLA) of a monocentric imager with a fiber optic plate (FOP) as a relay image transmission element in order to reduce the loss of CLA due to the addition of FOP. We constructed a two-stage image transmission coupling model of spherical focal surface (FOP) image sensor. By analyzing the influences of FOP parameters, including the fill factor and the fiber diameter, and FOP in-plane displacements, including rotation and translation on CLA, the loss of the lowest CLA that the monocentric imager can withstand caused by the addition of the FOP was reduced by 20%.
Highlights
The fiber optic plate (FOP) is a large-area array rigid passive fiber optic image transmission element composed of millions of fibers arranged in a hexagonal shape, with a compact and stable structure
The fill factor is an important parameter of a FOP, which is determined by the ratio of the light passing area of the FOP to the total area and can be expressed as where K is the fill factor, 0.907 is the fill coefficient of the FOP arranged in a hexagonal shape, dc is the fiber core diameter and d f is the fiber diameter
The image transmitted by the FOP is closer to the image received by the image sensor which is directly coupled to the imaging focal plane
Summary
The fiber optic plate (FOP) is a large-area array rigid passive fiber optic image transmission element composed of millions of fibers arranged in a hexagonal shape, with a compact and stable structure. The output end face of FOP is aligned with the input end face. The FOP thickness is thin; that is, fiber optic transmission channels are short. The FOP has lower transmission signal loss, higher transmittance and better image transmission performance. The most important advantage of FOP is that it can achieve one-to-one signal transmission between the input and output end faces of different shapes. According to actual requirements of image surface characteristics, we can prepare the input–output end surface of a FOP as a spherical–planar surface, a planar–spherical surface, a curved–curved surface, a planar–planar surface and other forms
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