Fixed pattern noise of microchannel plate

Jiao Lian; Tiezhu Bo; Chen Wang; Hua Cai; Xiaoxuan Shi; Chang Liu; Jing Ma; Shuaiqi Li; Hui Liu

doi:10.1117/12.2626815

27 March 2022 Fixed pattern noise of microchannel plate

Jiao Lian, Tiezhu Bo, Chen Wang, Hua Cai, Xiaoxuan Shi, Chang Liu, Jing Ma, Shuaiqi Li, Hui Liu

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 12169BC (2022) https://doi.org/10.1117/12.2626815
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

Fixed pattern noise (FPN) is a kind of image defect of microchannel plate (MCP), which is manifested by uneven brightness between the boundary and inside of multi-fibers. The formation mechanism of FPN was revealed by analyzing the characteristics of FPN of the MCP. The results showed that FPN appears at the boundary of multi-fibers and three sets of opposite sides of the multi-fibers show different brightness. The cause for the formation of FPN is that the gain of the outermost mono-fibers of multi-fibers is inconsistent with that of the inner of multi-fibers. The uneven brightness in the three sets of opposite sides is because of the different morphology of them. In the drawing multi-fibers process, the outermost mono-fibers deform into an ellipse-like shape due to lack of restraint. After the MCP is sliced along a certain bias angel, the ellipticity changes. The ellipticity of one set of opposite sides increases, while that of the other two groups decrease. In the melting process, the multi-fibers rotate at a small angle, resulting in slight differences in ellipticity between the two groups. When the input electrons hit the wall in channels with different ellipticities, they will excite secondary electrons with different trajectories, thus showing FPN. In order to reduce FPN, the deformation of the outermost of monofibers should be reduced as much as possible in the drawing multi-fibers process. The study will provide fundamental insights and useful guidelines for improving the performance of MCP.

Citation Download Citation

Jiao Lian, Tiezhu Bo, Chen Wang, Hua Cai, Xiaoxuan Shi, Chang Liu, Jing Ma, Shuaiqi Li, and Hui Liu "Fixed pattern noise of microchannel plate", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 12169BC (27 March 2022); https://doi.org/10.1117/12.2626815

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