Minimizing read noise in liquid crystal x-ray detectors using particle-in-binder HgI2 layers

被引:0
作者
Rho, Bong Gyu [1 ]
Baek, Sam Hak [1 ]
An, Young Suk [1 ]
Lei, Wei [2 ]
Choi, Se Yong [3 ]
Bae, Byung Seong [3 ]
机构
[1] Sesim Photon Technol Co, Uiwang 16072, Gyeonggi, South Korea
[2] Southeast Univ, Sch Elect Sci & Engn, Nanjing 210000, Peoples R China
[3] Hoseo Univ, Dept Semicond Engn, Asan 31499, Chungnam, South Korea
基金
新加坡国家研究基金会;
关键词
FLAT-PANEL; LIGHT VALVE; RADIOGRAPHY; SYSTEM;
D O I
10.1063/5.0231219
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
A liquid crystal x-ray detector was manufactured by coating HgI2 on a thin glass substrate liquid crystal cell in guest-host (GH) mode. The HgI2 layer was produced using the particle-in-binder (PIB) method. A reflective optical system was constructed so that one pixel corresponds to a 45 x 45 mu m(2) area of the liquid crystal cell. A quantification process was established to convert liquid crystal images into x-ray images. As a result, the signal-to-noise ratio (SNR) was 50 when irradiated with 32 keV, 10 mR/cm(2) x rays. In the liquid crystal x-ray detector, read noise decreases as the intensity of the light source increases. The full well capacity (FWC) of the image sensor was 100 ke, measured in the range of 25 ke to 70 ke, with a read noise of similar to 1%. To achieve an SNR at the shot noise level, an FWC of 500 ke is required, with measurements taken in the 100-400 ke range. In this case, the read noise is less than 0.3%, and the measurement precision approaches the physical limit.
引用
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页数:7
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