Card with magnetic stripe and method for testing magnetic inspection particle fluid
AssigneeCircle Systems, Inc.
InventorWilliam C. Chedister
Life of this patent
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Abstract
A magnetic stripe card provides a quantitative tool for the measurement of magnetic sensitivity for fine-grained iron, iron oxide or other ferro-magnetic powders, that may be used for magnetic particle inspection and other purposes. The magnetic stripe card is encoded to establish distinct areas on the magnetic stripe. Each distinct area has a specific magnetic gradient. Ferro-magnetic powders are attracted to the gradient in proportion to the value of the gradient. A higher gradient more strongly attracts the powder. A determination of the sensitivity of the powder can be ascertained by observing the gradient with the lowest value to which the powder is attracted.
Claims20
A device for determining effectiveness of a magnetic particle suspension, the device comprising:
- (a) a card having at least one magnetizable stripe thereon;
- (b) a predetermined, magnetized pattern being applied to the at least one magnetizable stripe;
- (c) the predetermined, magnetized pattern being suitable to determine the effectiveness of the magnetic suspension;
- and
- (d) the predetermined, magnetized pattern providing at least two different magnetic strength areas to the at least one magnetizable stripe.
A method for determining effectiveness of a magnetic particle suspension comprising:
- (a) providing a card having at least one magnetizable stripe thereon;
- (b) applying a predetermined, magnetic pattern to the at least one magnetizable stripe;
- (c) dipping the magnetic strip into a magnetic particle suspension;
- and
- (d) observing a pattern of particles on the at least one magnetizable stripe;
- and
- (e) determining an effectiveness of the magnetic particle suspension.
A device for determining effectiveness of a magnetic particle suspension, the device comprising:
- (a) a card having at least one magnetizable stripe thereon;
- (b) a predetermined, magnetized pattern being applied to the at least one magnetizable stripe;
- (c) the predetermined, magnetized pattern being suitable to determine the effectiveness of the magnetic suspension;
- (d) the predetermined, magnetized pattern providing at least two different magnetic strength areas to the at least one magnetizable stripe;
- (e) a clear nonmagnetizable coating protecting the at least one magnetizable stripe;
- (f) the at least one magnetizable stripe being reproducible;
- (g) the at least one magnetizable stripe being encoded with an encoding coil;
- (h) the encoding coil having alternating current or direct current;
- (i) the clear nonmagnetizable coating being at least one coating selected from the group consisting of polyethylene, polypropylene, and mixtures thereof;
- (j) the at least one magnetizable stripe having a low magnetic gradient in order to provide improved discrimination as to the magnetic particle suspension;
- (k) the at least one magnetizable stripe being duplicatable in order to provide an improved, repeatable, and reproducible test system;
- (l) the device failing to display a reading upon loss of magnetism;
- (m) the at least one magnetizable stripe having calculatable gradients in order to provide accurate testing;
- (n) the at least one magnetizable stripe having verifiable properties;
- (o) the alternating current providing at least one domain reversal in the magnetic strip;
- and
- (p) a frequency for the current determining a distance between the at least one domain reversal.
Dependencies are inferred from the claim text.