A sensor and/or detector having been optimized to produce a rapid rate of change in capacitive reactance and or inductive reactance such that changes in material composition or signal withing the electromagnetic field of the sensor or detecting means will produce a high rate of change in the output signal of the sensing or detecting means.

A sensor and/or detector having been optimized to produce a rapid rate of change in capacitive reactance and or inductive reactance such that changes in material composition or signal withing the electromagnetic field of the sensor or detecting means will produce a high rate of change in the output signal of the sensing or detecting means.

An apparatus for measuring an electromagnetic property of a material sample, includes: a housing having an internal cavity and a removable cover, wherein the housing with cover forms an electromagnetic resonance chamber; a container configured to receive the material sample, wherein the container extends along a y-axis of the housing through opposing sidewalls of the housing and passes through an x-y-z center point of the cavity; two opposing electrical signal lines oriented along an x-axis of the housing are disposed and configured to couple to an electromagnetic resonant mode of the cavity; at least one resonator concentrically disposed about the container and disposed within the cavity, wherein the at least one resonator is fixed or fixedly movable relative to the y-axis; and, a frequency tuner concentrically disposed about the container and at least partially disposed within the cavity, wherein the frequency tuner is fixedly movable along the y-axis.

An apparatus for measuring an electromagnetic property of a material sample, includes: a housing having an internal cavity and a removable cover, wherein the housing with cover forms an electromagnetic resonance chamber; a container configured to receive the material sample, wherein the container extends along a y-axis of the housing through opposing sidewalls of the housing and passes through an x-y-z center point of the cavity; two opposing electrical signal lines oriented along an x-axis of the housing are disposed and configured to couple to an electromagnetic resonant mode of the cavity; at least one resonator concentrically disposed about the container and disposed within the cavity, wherein the at least one resonator is fixed or fixedly movable relative to the y-axis; and, a frequency tuner concentrically disposed about the container and at least partially disposed within the cavity, wherein the frequency tuner is fixedly movable along the y-axis.

An information processing device includes a sensor configured to detect a substance applied to a medium containing confidential information and a processor configured to record information including substance information identifying the substance detected with the sensor and user information on a user carrying the medium in combination.

An information processing device includes a sensor configured to detect a substance applied to a medium containing confidential information and a processor configured to record information including substance information identifying the substance detected with the sensor and user information on a user carrying the medium in combination.

A magnetic body inspection apparatus includes a magnetic field application unit configured to apply a magnetic field to a long material including a magnetic body to be inspected, a detector configured to excite, in a longitudinal direction of the long material, magnetization of the magnetic body, the detector being configured to acquire a detection signal based on the magnetic field of the magnetic body that has been excited, and a detection apparatus body including the magnetic field application unit and the detector, the detection apparatus body being configured to be attachable to the long material in a short-side direction of the long material.

A metal detection apparatus has a passage channel (100) through which products (P) that may contain metal contaminants (C) pass. The apparatus has at least one transmitter unit (1) that provides transmitter signals to a transmitter coil (2) that is inductively coupled to a first and a second receiver coil (31; 32). The receiver coils are balanced and connected separately or combined to an input of a receiver unit (4). The transmitter coil has at least two coil sections (211, 212; 221, 222) that are arranged inclined to one another, with each coil section generating at least a first and a second magnetic field (M.sub.y; M.sub.Z). Each of the first and the second receiver coils has at least a first coil section (311; 321) that is engaged in the first magnetic field and at least a second coil section (312; 322) that is engaged in the second magnetic field.

An apparatus for measuring material properties of an object of ferromagnetic material, the apparatus including a probe, the probe including an electromagnet core defining two spaced-apart poles for inducing a magnetic field in the object, and a drive coil wound around the electromagnet core, and means to supply an alternating electric current to the drive coil to generate an alternating magnetic field in the electromagnet core and consequently in the object, wherein the probe also includes two sensing coils arranged in the vicinity of each of the poles, for sensing the magnetic flux density that links the core and the object, such sensing coils are significantly more sensitive to changes in material properties than are sensing coils overwound onto the drive coil.

An apparatus for measuring material properties of an object of ferromagnetic material, the apparatus including a probe, the probe including an electromagnet core defining two spaced-apart poles for inducing a magnetic field in the object, and a drive coil wound around the electromagnet core, and means to supply an alternating electric current to the drive coil to generate an alternating magnetic field in the electromagnet core and consequently in the object, wherein the probe also includes two sensing coils arranged in the vicinity of each of the poles, for sensing the magnetic flux density that links the core and the object, such sensing coils are significantly more sensitive to changes in material properties than are sensing coils overwound onto the drive coil.