“scanner”的概念、定义、翻译、参考文献-科学参考

scanner

Computer

1. A device that can capture an image and convert it into a unique set of electrical signals. The image scanned may be a pattern that is directly related to a code, such as bar codes on retailed products, or it may be a picture, page, or portion of text. See also bar-code scanner, document scanner, drum scanner, flatbed scanner.
2. Another name for lexical analyser.

Internet

1 A form of virus detection software. It scans a computer looking for known code patterns associated with viruses. Scanners can be executed continuously or can be scheduled to be executed at frequent intervals.
2 A hardware device which converts hard-copy images such as magazine photographs into graphic files. See also scanned image.

Electronics and Electrical Engineering

1. (rectilinear scanner) A device that visualizes the distribution of a radioactive compound in a particular system, usually the human body. The scanner consists of a scintillation crystal, photomultiplier tube, and amplifying circuits. The crystal is collimated, so that only the radiation from a small area is received at any given instant, and driven backwards and forwards to produce a rectilinear scan of the area investigated. Double-headed scanners have been developed in which the output is the sum of the outputs of two crystals that simultaneously scan the area of interest. Anomalies arising from a source deep within a human body are minimized by this technique.
2. See image scanner.
3. See 3D scanner.
4. See flying-spot scanner.

单词	scanner
释义	scanner Computer 1. A device that can capture an image and convert it into a unique set of electrical signals. The image scanned may be a pattern that is directly related to a code, such as bar codes on retailed products, or it may be a picture, page, or portion of text. See also bar-code scanner, document scanner, drum scanner, flatbed scanner. 2. Another name for lexical analyser. Internet 1 A form of virus detection software. It scans a computer looking for known code patterns associated with viruses. Scanners can be executed continuously or can be scheduled to be executed at frequent intervals. 2 A hardware device which converts hard-copy images such as magazine photographs into graphic files. See also scanned image. Electronics and Electrical Engineering 1. (rectilinear scanner) A device that visualizes the distribution of a radioactive compound in a particular system, usually the human body. The scanner consists of a scintillation crystal, photomultiplier tube, and amplifying circuits. The crystal is collimated, so that only the radiation from a small area is received at any given instant, and driven backwards and forwards to produce a rectilinear scan of the area investigated. Double-headed scanners have been developed in which the output is the sum of the outputs of two crystals that simultaneously scan the area of interest. Anomalies arising from a source deep within a human body are minimized by this technique. 2. See image scanner. 3. See 3D scanner. 4. See flying-spot scanner.
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