Digital transducer system including two reactive transducers for

Details Digital transducer system including two reactive transducers for Digital transducer system including two reactive transducers for

1992-05-26

1994-03-08

Grimm, Siegfried H.

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

73717, 73723, 32420716, 32420718, 331 65, 331109, 331117R, 331173, 331183, 340626, H03B 512, G01L 708, G01L 910

Patent

active

052931374

ABSTRACT:
A variable reluctance transducer system incorporating digital control of parallel resonant circuits including two inductive sensors L1 and L2 on each side of a flat diaphram. The dual variable reluctance elements provide dual frequency signals for digital calculation to obtain a quotient of the frequencies, thereby substantially eliminating the resonant frequencies as a variable in the accuracy of the device. Manipulation of the produced quotient by a micro-controller 10 employing digital calibration tables stored in a programmable read only memory 14 allows calibration reponsive to a temperature sensor 16, thereby substantially eliminating temperature induced errors in the system, further increasing accuracy.

REFERENCES:
patent: 4536719 (1985-08-01), Baum et al.
patent: 5079523 (1992-01-01), Kleinhaus

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