Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1988-08-30
1990-01-23
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324683, 73780, 73724, 34087037, G01R 2726, G01R 1152
Patent
active
048961000
ABSTRACT:
A signal conditioner for generation of excitation signals and for detecting an output signal from a capacitive transducer such as a strain gage, a pressure transducer or an accelerometer. The signal conditioner includes a digital waveform generator for generating a waveform that approximates a sine wave and for generating a binary signal synchronized to the waveform, a filter responsive to the waveform for providing a first sinusoidal excitation signal, an analog inverter responsive to the first excitation signal for providing a second sinusoidal excitation signal that is 180.degree. out of phase with the first excitation signal and a demodulator responsive to the binary signal for synchronously detecting an output signal from the capacitive transducer.
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J. M. Nielsen, "A Hermetically Sealed High Temperature Capacitive Strain Gage Design", date unknown.
Eisenzopf Reinhard J.
Hitec Products, Inc.
Solis Jose
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