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Proceedings Paper

The application of PSD in the faultage x-ray photograph system
Author(s): Shuyun Wang; Tianze Li
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Paper Abstract

Expound the transverse photoelectrical effect, operating principle of the Position Sensitive Detector (PSD). Analyze the main aspects that cause the non-linearity: the heterogeneity of the materials used to make the PSD's N region, the electrodes' size and shape, the uneven resistance of the P region surface, the asymmetrical distribution of the junction capacitance, the temperature excursion and so on. When a beam irradiates the PSD, whose surface resistance is even, two photocurrents I1 and I2 will be obtained on both load resistors of the signal electrodes. Their magnitudes are determined by the incident beam position and the values of the equivalent resistances R1 and R2 between the two electrodes. The values of the load resistance can be ignored compared with the values of R1 and R2. After the processing of PSD's output signals, conclusion is drawn that the PSD's output signals only have relationship with the position, rather than the light intensity. The prominent merits of non-requirement of sample conversion and the ability to set up the position of ionization greatly shorten the period of image capture, which enables its utilization in Faultage X-ray photography. Expound the aspects which improve the filled air pressure as well as the detector's efficiency and resolution. At last, we analyze the PSD's dynamic response error, and draw some important conclusions. We also forecast the application of the combination of the PSD and the faultage X-ray photograph system in medical engineering.

Paper Details

Date Published: 6 March 2009
PDF: 8 pages
Proc. SPIE 7280, Seventh International Conference on Photonics and Imaging in Biology and Medicine, 72801W (6 March 2009); doi: 10.1117/12.821180
Show Author Affiliations
Shuyun Wang, Shandong Univ. of Technology (China)
Tianze Li, Shandong Univ. of Technology (China)

Published in SPIE Proceedings Vol. 7280:
Seventh International Conference on Photonics and Imaging in Biology and Medicine
Qingming Luo; Lihong V. Wang; Valery V. Tuchin, Editor(s)

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