A probe for non-intrusively detecting imperfections in a test object made from metallic, non-conductive, and/or composite materials. The probe may include a capacitive measuring apparatus that includes at least two coplanar electrodes, an adjustment device to adjust a spatial separation between the electrodes, and a separation device. The separation device may maintain a substantially constant distance between the at least two coplanar electrodes and the test object during test measurements.

A system for analyzing a state of a thermoset material is disclosed. In various embodiments, the system includes a source of electromagnetic energy configured to expose a sample of the thermoset material to an electric field; a detector configured to determine at least one of a dielectric permittivity or a complex admittance of the sample over a range of frequencies in response to a frequency sweep over the electric field; and an analyzer configured to assess the state of the thermoset material by comparing the at least one of the dielectric permittivity or the complex admittance of the sample against an acceptability map. In various embodiments, the acceptability map comprises a series of acceptability bands that represent a decrease in effective relaxation time from a baseline fresh batch of the thermoset material.

A system for analyzing a state of a thermoset material is disclosed. In various embodiments, the system includes a source of electromagnetic energy configured to expose a sample of the thermoset material to an electric field; a detector configured to determine at least one of a dielectric permittivity or a complex admittance of the sample over a range of frequencies in response to a frequency sweep over the electric field; and an analyzer configured to assess the state of the thermoset material by comparing the at least one of the dielectric permittivity or the complex admittance of the sample against an acceptability map. In various embodiments, the acceptability map comprises a series of acceptability bands that represent a decrease in effective relaxation time from a baseline fresh batch of the thermoset material.

A probe for non-intrusively detecting imperfections in a test object made from metallic, non-conductive, and/or composite materials. The probe may include a capacitive measuring apparatus that includes at least two coplanar electrodes, an adjustment device to adjust a spatial separation between the electrodes, and a separation device. The separation device may maintain a substantially constant distance between the at least two coplanar electrodes and the test object during test measurements.

A probe for non-intrusively detecting imperfections in a test object made from metallic, non-conductive, and/or composite materials. The probe may include a capacitive measuring apparatus that includes at least two coplanar electrodes, an adjustment device to adjust a spatial separation between the electrodes, and a separation device. The separation device may maintain a substantially constant distance between the at least two coplanar electrodes and the test object during test measurements.

An apparatus configured to perform non-destructive, electrical measurements on a plant stalk to detect and quantify internal damage is disclosed. This apparatus includes features to minimize misalignments that can negatively affect the precision and/or accuracy of the electrical measurements.

An apparatus configured to perform non-destructive, electrical measurements on a plant stalk to detect and quantify internal damage is disclosed. This apparatus includes features to minimize misalignments that can negatively affect the precision and/or accuracy of the electrical measurements.

An apparatus and a method for detecting insect infestation are described. The apparatus includes a cylindrical capacitive sensor including a first semi-cylindrical electrode plate and a second semi-cylindrical electrode plate, wherein the first semi and second semi-cylindrical electrode plates are configured to wrap around the test tree trunk and a processing circuitry, which is configured to measure a capacitance of the test tree trunk when positioned between the first semi-cylindrical electrode plate and the second semi-cylindrical electrode plate and provide a measured capacitance, compare the measured capacitance of the test tree trunk to a reference capacitance of a reference tree trunk, and determine whether an insect infestation is present in the test tree trunk. The cylindrical capacitive sensor can further include another two types of electrode configurations: two pairs of cylindrical electrode strips and two cylindrical electrode rings, wherein the two pairs of cylindrical electrode strips are further configured to positively charge a first pair of cylindrical electrode strips wherein the two the cylindrical electrode strips are oppositely positioned and negatively charge a second pair of cylindrical electrode strips wherein the two cylindrical electrode strips are oppositely positioned, and the two cylindrical electrode rings is further configured to positively charge a first cylindrical electrode ring and negatively charge a second cylindrical electrode ring.

An apparatus and a method for detecting insect infestation are described. The apparatus includes a cylindrical capacitive sensor including a first semi-cylindrical electrode plate and a second semi-cylindrical electrode plate, wherein the first semi and second semi-cylindrical electrode plates are configured to wrap around the test tree trunk and a processing circuitry, which is configured to measure a capacitance of the test tree trunk when positioned between the first semi-cylindrical electrode plate and the second semi-cylindrical electrode plate and provide a measured capacitance, compare the measured capacitance of the test tree trunk to a reference capacitance of a reference tree trunk, and determine whether an insect infestation is present in the test tree trunk. The cylindrical capacitive sensor can further include another two types of electrode configurations: two pairs of cylindrical electrode strips and two cylindrical electrode rings, wherein the two pairs of cylindrical electrode strips are further configured to positively charge a first pair of cylindrical electrode strips wherein the two the cylindrical electrode strips are oppositely positioned and negatively charge a second pair of cylindrical electrode strips wherein the two cylindrical electrode strips are oppositely positioned, and the two cylindrical electrode rings is further configured to positively charge a first cylindrical electrode ring and negatively charge a second cylindrical electrode ring.

Aspects relate to a sensor device 1 and a method for detecting properties of a medium having an inner space bounded by a wall. An open measuring capacitor is arranged in the inner space. A coupling capacitor with at least two coupling capacitor areas is arranged on the wall in such a way that at least a part of the wall is arranged between an inner coupling capacitor area and an outer coupling capacitor area. The inner coupling capacitor area is connected to the measuring capacitor 10.