| 摘要 |
<p>A displacement transducer has a movable slug (34) which varies the mutual inductance of two coil sections (30, 32). The coil sections are connected in a network (15) which causes a variation of phase shift in a signal from an oscillator (10) on movement of the slug (34). A phase detector (18) detects this phase shift. The use of a variable phase design overcomes the need for high gain linear amplification and the problem of noise in conventional variable amplitude LVDTs. The variable phase shift network (15) obviates the need for balanced amplitude quadrature input signals of one known variable phase transducer, while giving a linear phase shift without the need for a specially shaped slug as in another known variable phase transducer.</p> |
