Patent ID: 9632453
Date: 2017-04-25
CPC Classifications: G01N,G01R,G03G

Claim:
1. A differential transformer magnetic permeability sensor comprising: a substrate; at least one drive coil; a first differential coil which is disposed at a side of a first surface of the substrate and in which an induced voltage is generated when the at least one drive coil is driven; a second differential coil which is disposed at a side of a second surface opposite to the first surface of the substrate and connected with the first differential coil, and in which an induced voltage is generated when the at least one drive coil is driven; a first interconnection pattern that is located on the first surface and allows the first differential coil to serve as a reference coil and the second differential coil to serve as a sensing coil; and a second interconnection pattern that is located on the second surface and allows the second differential coil to serve as a reference coil and the first differential coil to serve as a sensing coil, wherein the substrate has: