Lesson plan
Linear diode array
strip overlays a linear silicon-integrated photodiode array mounted by chip-on-board surface-mount technology onto a green printed circuit board A linear diode array is the X-ray detecting element of a pixelated X-ray line-scan camera or 1-D imaging X-ray detector. The input of an LDA system is a photodiode module. Each module contains multiple (32 to 256) photodiodes arranged in a short line segment (2 inches). Multiple modules are tiled in one row, aligned to arrange the photodiodes inside them into one long sensitive line, up to 32 inches or more. The photodiodes are laminated with a scintillation screen to make them sensitive to X-rays. The scintillation screen converts the photon energy of any X-rays (or gamma rays) that strike it into visible light, which is coupled to the photodiodes in contact with it. Each photodiode produces a voltage or current proportional to the light energy it receives. The LDA usually multiplexes the voltages into one or more analog-to-digital converters. It then sends the digital values (pixel data) to a computer for optional correction, averaging, and filtering, followed by human viewing and interpretation, digital image analysis, and digital storage.
Article summary
strip overlays a linear silicon-integrated photodiode array mounted by chip-on-board surface-mount technology onto a green printed circuit board A linear diode array is the X-ray detecting element of a pixelated X-ray line-scan camera or 1-D imaging X-ray detector. The input of an LDA system is a photodiode module. Each module contains multiple (32 to 256) photodiodes arranged in a short line segment (2 inches). Multiple modules are tiled in one row, aligned to arrange the photodiodes inside them into one long sensitive line, up to 32 inches or more. The photodiodes are laminated with a scintillation screen to make them sensitive to X-rays. The scintillation screen converts the photon energy of any X-rays (or gamma rays) that strike it into visible light, which is coupled to the photodiodes in contact with it. Each photodiode produces a voltage or current proportional to the light energy it receives. The LDA usually multiplexes the voltages into one or more analog-to-digital converters. It then sends the digital values (pixel data) to a computer for optional correction, averaging, and filtering, followed by human viewing and interpretation, digital image analysis, and digital storage.
Key claims
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.