Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1996-06-20
1997-09-16
Dombroske, George M.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324683, 73862627, G01L 100
Patent
active
056684800
ABSTRACT:
A transducer (23) for producing a digital output signal proportional to a change in a sensed physical parameter includes first and second pairs of series-connected resistors (24, 25 or 26, 28). The electrical resistance of at least one of these resistors is variable in response to a change in the sensed parameter. The transducer also includes sine wave generators (31, 32) for applying first and second sine waves across the first and second pairs, respectively. However, these first and second exciting voltages are phase-shifted relative to one another by a constant phase angle. The voltages between the resistors of each pair are vector-summed. The phase angle of this vector-sEed signal is compared with the phase of the reference sine wave, and a pulse-width-modulated waveform is produced. A counter (36) is operatively arranged to count the time difference between the currents of a distinguishing event of the vector-summed signal and the occurrence of a like distinguishing event of the sinusoidal reference voltage. The output of the transducer is a digital signal proportional to a change in the sensed physical parameter.
REFERENCES:
patent: 2759149 (1956-08-01), Hart
patent: 2780778 (1957-02-01), Rost et al.
patent: 4074186 (1978-02-01), Flahertg
Biegel Ronald L.
Dombroske George M.
Moog Inc.
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