High accuracy position indicator

Details High accuracy position indicator High accuracy position indicator

1976-03-15

1979-02-20

Caldwell, Sr., John W.

Communications: electrical

Digital comparator systems

318657, 323 51, G08C 1908

Patent

active

041409981

ABSTRACT:
A position indicator is disclosed which includes the combination of a linear voltage differential transformer (LVDT) and accuracy assurance circuitry. The LVDT includes a movable core connected to a mechanism whose position is to be indicated. The accuracy assurance circuitry permits the disclosed indicator to operate substantially independent of fluctuations in input voltage or frequency. This substantial independence is achieved in the following manner. First, the voltage across the LVDT is rectified by a first precision rectifier. Simultaneously, the LVDT tap voltage is rectified by a second precision rectifier. Each precision rectifier output is filtered and then applied to an analog divider which "cancels out" the effects of input voltage or frequency fluctuation. The divider output is an analog signal which is a true ratio of tap voltage to voltage across the LVDT. This true ratio signal accurately represents the position of the mechanism connected to the movable core.

REFERENCES:
patent: 3079545 (1963-02-01), Kretsch et al.
patent: 3181055 (1965-04-01), Bischof
patent: 3210746 (1965-10-01), Clapp
patent: 3530307 (1970-09-01), Evans et al.
patent: 3931737 (1976-01-01), Conkling et al.
patent: 3939389 (1976-02-01), Nopper
patent: 3956741 (1976-05-01), Kraus
patent: 3976894 (1976-08-01), Perkins et al.

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