Measurement of a linear variable differential transformer...

Details Measurement of a linear variable differential transformer... Measurement of a linear variable differential transformer...

G - Physics

08

C

354/73, 340/135.

G08C 21/00 (2006.01) G01D 5/22 (2006.01) H03M 1/00 (2006.01)

Patent

CA 1198792

ABSTRACT OF THE DISCLOSURE A measurement system for converting the outputs of dissimilar transducers into digital numbers by means of a phase conversion tech- nique. The outputs of a plurality of dissimilar transducers are gene- rated as pairs of amplitude modulated sinusoidal signals. All AM signal pairs are converted into phase modulated signal pairs by a plurality of identical conversion circuits where the phase difference between at least one PM signal pair is linearly related to the measured parameter of the transducer associated therewith. The phase differ- ences for each transducer is converted into a digital number by count- ing increments of time between the zero crossings of each pair of phase modulated signals and outputting the resulting count to a data buss of a control processor. Transducer parameters which are nonlinearly related to their phase differences are compensated by a correction factor which is calculated by knowing the error between any parti- cular measured input and the linear input.

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