Apparatus for converting a mechanical displacement to an electri

Details Apparatus for converting a mechanical displacement to an electri Apparatus for converting a mechanical displacement to an electri

1979-08-08

1981-06-09

Krass, Errol A.

Boots, shoes, and leggings

73718, 364556, G12B 100

Patent

active

042728223

ABSTRACT:
Apparatus for converting a mechanical displacement to an electrical signal having a capacitor type displacement detector for detecting a mechanical displacement in terms of capacitances C1 and C2 of two capacitors and means for producing a signal corresponding to (C1-C2)/(C1+C2). The capacitance sum (C1+C2) is converted into a pulse with the duty ratio D proportional to the capacitance sum and a voltage Vd' corresponding to the capacitance difference (C1-C2) is multiplied by the reciprocal 1/D of the duty ratio D so as to produce a current proportional to a desired amount (C1-C2)/(C1+C2). Even if the difference voltage changes widely, the duty ratio D is not affected by this change and therefore the linearity error is not increased.

REFERENCES:
patent: 3620083 (1971-11-01), Dimeff et al.
patent: 3646538 (1972-02-01), Frick
patent: 3652930 (1972-03-01), Sugiyama et al.
patent: 3742347 (1973-06-01), Walton
patent: 4089036 (1978-05-01), Geronime
patent: 4196632 (1980-04-01), Sikorra

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