| 摘要 |
<p>A signal transmission system using two optical transmission channels (112, 113, 114, 211, 212 and 122, 123, 124, 221, 222) with switches (111, 213, 121, 223) and calibration circuits (104, 215, 225) operated by a control system (105, 106, 206, 205, 204) such that one channel carries the signal (133) while the other is calibrated. The process makes the responses of the channels more accurate and substantially identical to each other, so that either of the outputs (275, 285) alone, or their average, selected at appropriate times, provides a continuous output (202) representative of the signal. The process does not limit transmission bandwidth, and the calibration cycle repetition rate needs only to be high enough to reduce errors such as gain and offset drift caused by temperature changes and mechanical stress. It is used advantageously as an input device for an oscilloscope, to make galvanically-isolated, wide-bandwidth measurements.</p> |
