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原文文本 - English英语 The cathode-ray tube in the receiver performs the opposite function to the camera tube in the transmitter, converting the electrical signal into an optical image. Fig. 1 shows in outline the action of the cathode-ray tube, where, for the moment, the deflecting and focusing arrangements are omitted. The electrical signal, which represents the picture, is applied to the control electrode, which functions in a manner similar to that of the control grid in a tube. The signal causes the potential of the control electrode to vary about a mean level, and as this goes more negative, it reduces the intensity of the electrode to vary about a mean level, and as this goes more negative, it reduces the intensity of the electron beam, with a resulting reduction in the brightness of the spot formed on the fluorescent screen. Likewise, as it goes less negative, it increases the brightness of the spot on the screen. The fluorescent screen is made out of a phosphor, which is a material that emits light when bombarded with an electron beam.
I had 3 years experience as a technical translator in a non-destructive test (NDT) company in beijing, then I became a field engineer/project manager as a result of a good command of NDT technology. I began to use AutoCAD for electric, mechnical, civil engineering drawings.
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