초록 ▼

A highly accurate signal conditioning circuit for use with a linear/rotary variable differential transformer (L/R VDT) operating in a unipolar mode is disclosed. The circuit may be utilized for ratiometric comparison of L/R VDT primary coil peak excitation and L/R VDT secondary coil peak response. U

A highly accurate signal conditioning circuit for use with a linear/rotary variable differential transformer (L/R VDT) operating in a unipolar mode is disclosed. The circuit may be utilized for ratiometric comparison of L/R VDT primary coil peak excitation and L/R VDT secondary coil peak response. Unique peak detectors are used for detecting both primary and secondary peak values. The circuit may include an oscillator having R and C elements in a tank circuit which also includes the L/R VDT primary coil. Offset errors may be determined externally by providing for a momentary shutdown of the oscillator to permit the measurement of DC components to the signal conditioner and excitation DC outputs, by external means.

대표청구항 ▼

Signal conditioning circuitry for providing an output signal indicative of L/R VDT primary coil excitation waveform voltage amplitude and for providing an output signal indicative of the voltage across a selected one of the L/R VDT\s secondary coils and therefore indicative of L/R VDT displacement o

Signal conditioning circuitry for providing an output signal indicative of L/R VDT primary coil excitation waveform voltage amplitude and for providing an output signal indicative of the voltage across a selected one of the L/R VDT\s secondary coils and therefore indicative of L/R VDT displacement on one side of the null only, comprising: a first linear slope peak detector, responsive to a present rectified signal value of the primary coil excitation voltage amplitude for comparing said primary\s present rectified signal value to a stored first peak detector output signal indicative of the peak amplitude of a past rectified signal value of said primary excitation and for changing said stored first peak detector output signal value to correspond to and be indicative of said present primary rectified signal value; and a second linear slope peak detector responsive to a present rectified signal value of the selected secondary coil\s voltage amplitude for comparing said present secondary rectified signal value to a stored second peak detector output signal indicative of the peak amplitude of a past secondary rectified signal value and for changing said stored second peak detector output signal value to correspond to and be indicative of said present rectified signal value.