Drift resistant magnet strength signal evaluation circuit

Details Drift resistant magnet strength signal evaluation circuit Drift resistant magnet strength signal evaluation circuit

1982-10-20

1986-08-05

Karlsen, Ernest F.

Electricity: measuring and testing

Magnetic

Permanent magnet testing

G01N 2774, G01R 3312

Patent

active

046045732

ABSTRACT:
To test magnetic elements, by integrating output signals derived from a sensing coil to which the magnetic elements are exposed, by being passed therethrough, the output signals are additionally applied to a threshold switch, which activates the integrator only if (a) the output signals exceed a given threshold, and (b) they are in a predetermined polarity, so that the integrator will not integrate first in one and then in reverse direction, thus providing no useful output signals. The system is simple and avoids the necessity of special circuitry.

REFERENCES:
patent: 3706027 (1972-12-01), Grice, Jr. et al.
patent: 4058763 (1977-11-01), Steingroever
patent: 4068138 (1978-11-01), Miyakawa et al.

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