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High resolution position sensing apparatus with linear variable differential transformers having phase-shifted energizing signals
High resolution position sensing apparatus with linear variable differential transformers having phase-shifted energizing signals
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机译:具有线性可变差分变压器的高分辨率位置感测设备,该线性可变差分变压器具有相移的激励信号
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摘要
Apparatus for high resolution sensing of the position of a rapidly moving member. The apparatus includes at least two linear variable differential transformers (LVDT's) each having a magnetic core coupled to the movable member. A signal source and a phase shifter provide energizing signals to the primary coil of each LVDT. The energizing signals have the same frequency but are phase shifted relative to each other. The induced secondary voltages of the LVDT's are sampled by synchronous detectors, the outputs of which are combined by an adder into a high resolution output signal. When two LVDT's are utilized, the energizing signals have a relative phase shift of 90° and the effective position sampling rate is doubled. The apparatus can be used to sense the operating frequency of a tunable magnetron.
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