Phase-sensitive transducer apparatus with signal offset means

Details Phase-sensitive transducer apparatus with signal offset means Phase-sensitive transducer apparatus with signal offset means

G - Physics

05

B

318/30

G05B 1/01 (2006.01) G01D 5/20 (2006.01) G05D 3/14 (2006.01)

Patent

CA 1067138

PHASE-SENSITIVE TRANSDUCER APPARATUS WITH SIGNAL OFFSET MEANS ABSTRACT OF THE DISCLOSURE A phase-sensitive transducer apparatus comprises first and second relatively movable members, the first relatively movable member having a plurality of windings and the second relatively movable member having a winding. A first input signal is applied to one of the windings of the first relative- ly movable member and a second input signal to another of the windings of the first relatively movable member, an output signal being thereby induced on the winding of the second relatively movable member. The first and second input signals are sinusoidal in nature of substantially identical frequency and peak amplitude and are phase-displaced by a predetermined amount, and the output signal is substantially constant in peak amplitude and variable in phase during relative movement of the first and second relatively movable members. The apparatus further comprises a squaring circuit coupled to the winding of the second relatively movable member for squaring the output signal waveform, a demodulator circuit coupled to the squaring circuit for demodulating the squared output signal waveform to derive a pulse signal of constant peak amplitude and variable pulse width as the first and second relatively movable members are moved relative to one another, an integrator circuit coupled to the demodulator circuit for integrating the pulse signal to derive a position signal indicative of the relative movement of the first and second relatively rotatable members, the position signal alternating during such relative movement substantially between a supply voltage and a reference voltage, and an offset circuit coupled to the integrator circuit for offsetting the position signal so that it is substantially balanced about the reference voltage.

272447

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