数字X 线机的自动曝光控制_stmopen 关键词】: 亮度 胶片影像密度 光电计时器 曝光控制 [gap=560]Keywords】: BrightnessFilm image densityPhototimerExposure control
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分析气体粘滞性阻力和光电计时器所引起的系统误差的因素，以及修正这误差的建议。
This paper analysised factors of system error by gas viscous resistance and photoelectric timer, and suggested to amend it.
该计时器采用光电技术和微电脑技术，设计先进，使用安全。
With the adoption of the technology of photo electricity and microcomputer, the controller proves itself to be of advanced design and security.
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