Magnetic field strength detector
First Claim
1. A magnetic field strength detector comprising:
- a magnetic field sensing element that outputs voltage as a function of magnetic field strength; and
an indicator that alters as a function of the voltage output by the magnetic field detector when the magnetic field strength exceeds a threshold, wherein the alteration of the indicator is substantially irreversible.
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Abstract
A magnetic field strength detector includes a magnetic field sensing element that outputs voltage as a function of magnetic field strength. In some embodiments, the magnetic field sensing element comprises a coil, and voltage is induced across the coil as a function of the magnetic field strength. A magnetic field strength detector also includes an indicator that alters as a function of the voltage output by the magnetic field sensing element when the magnetic field strength exceeds a threshold. The alteration is substantially irreversible and, in some embodiments, visible. The detector may be used to, for example, measure the strength of a magnetic field generated by a degaussing device, or to confirm that a particular medium was exposed to a magnetic field with a strength adequate to degauss the medium.
57 Citations
20 Claims
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1. A magnetic field strength detector comprising:
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a magnetic field sensing element that outputs voltage as a function of magnetic field strength; and
an indicator that alters as a function of the voltage output by the magnetic field detector when the magnetic field strength exceeds a threshold, wherein the alteration of the indicator is substantially irreversible. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A magnetic field strength detector comprising:
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a coil, wherein voltage is induced across the coil as a function of magnetic field strength;
a fuse element coupled to the coil that fails based on a current presented to the fuse element as a result of the voltage induced across the coil when the magnetic field strength exceeds a threshold; and
a plurality of substrate layers, wherein each of the coil and the fuse element are formed on at least one of the substrate layers. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification