| 摘要 |
PURPOSE:To simultaneously detect many signals by a simple constitution, by fetching the output of a DC skid by one piece of coaxial cable, bringing it to synchronization detection by the modulating signal of a prescribed frequency, and bringing the synchronization detection output to synchronization detection by the modulating signal of each different frequency. CONSTITUTION:Skids 11-13 are excited by the currents of each different angular frequency omega1-omega3, supplied from modulating signal generators 101-103 to feedback coils 111-113, and simultaneously, outputs V1-V3 are brought to negative feedback through resistances Rf1-Rf3. Accordingly, the outputs of a value corresponding to inputs B1-B3 are obtained from the skids 11-13, they are synthesized in series and a composite value B0 is applied as an input to a skid 14, excited through a coil 114 by a generator 104, and also, by bringing it to synchronization detection by the modulating signal of an angular frequency omega0, an output V0 corresponding to the input B0 is obtained. The output V0 has the modulation component of the angular frequencies omega1-omega3 having a value corresponding to inputs B1-B3, therefore, by bringing it to synchronization detections 91-93 by the respective modulating signals, the outputs of a value corresponding to the inputs B1-B3 are obtained, and the detecting signals of three inputs can be fetched by one piece of coaxial cable for connecting an extremely low temperature side and a room temperature side.
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