| 摘要 |
A sensor or transducer which is adapted to transform a measurable parameter into a digital signal representing the magnitude of said parameter, comprising a bistable unit with an element which is sensitive for said parameter, means for bringing said unit into the metastable state, means for counting the number of transitions towards one side or the other, and means for indicating the counting results, said number of transitions being influenced by said sensitive element in function of the magnitude of said parameter. Said bistable unit is, in particular, a symmetrical electrical bistable circuit having in one branch thereof an element which is sensitive for said parameter, the metastable state of said circuit being effected by interrupting the supply or applying an auxiliary voltage or current at a desired, and in particular high, frequency. Such a bistable element is, in particular, connected to a differential counter indicating the number of transitions towards one side and the other resp. |
