Electrical sensor assembly

A sensor assembly comprising:

• a first electrode extending along a longitudinal axis;
• a tubular second electrode at least partially surrounding the first electrode such that the tubular second electrode is radially spaced from the first electrode, wherein the tubular second electrode is configured to form a capacitive coupling with the first electrode as an electric field sensor;
• a first tubular electric screen extending along the longitudinal axis, wherein the first tubular electric screen at least partially surrounds the tubular second electrode such that the tubular electric screen is radially spaced from the tubular second electrode and electrically isolated from the tubular second electrode;
• a second tubular electric screen, wherein the second tubular electric screen at least partially surrounds the first electrode such that the tubular second electric screen is radially spaced from the first electrode, wherein the second tubular electric screen extends in an axial direction beyond an axial end of the second tubular electrode;
• and
• a mass of dielectric material extending along the longitudinal axis and at least partially enclosing the electrode, the tubular second electrode, and the first and second tubular electric screens,
• wherein the second tubular electric screen includes a plurality of through openings, each through opening configured to enable the mass of dielectric material to pass through during casting.

A sensor assembly comprising:

• a source electrode extending along a longitudinal axis;
• a tubular section extending along the longitudinal axis and at least partially surrounding the source electrode such that the tubular section is radially spaced from the source electrode, the tubular section including:
• a central portion including a first electrically conductive material configured to form a capacitive coupling with the source electrode,
• a first axial end portion extending in a first direction away from the central portion along the longitudinal axis and including a second electrically conductive material electrically isolated from the first electrically conductive material, wherein the second electrically conductive material is configured to shield the capacitive coupling from external electric fields, and
• a second axial end portion extending in a second direction opposite the first direction away from the central portion along the longitudinal axis and including a third electrically conductive material electrically isolated from the first electrically conductive material, wherein the third electrically conductive material is configured to shield the capacitive coupling from external electric fields;
• and
• a mass of insulating material at least partially enclosing the source electrode and the tubular section, and
• wherein each of the central portion, the first axial end portion, and the second axial end portion includes a plurality of through openings that are configured to be filled by the insulating material.

A sensor assembly comprising:

• a source electrode extending along a longitudinal axis;
• a circular member at least partially surrounding the source electrode such that the circular member is radially spaced from the source electrode, wherein the circular member is multilayered including two layers of electrically conductive material;
• a plurality of cantilevered sections extending from the circular member, wherein the plurality of cantilevered sections are located side by side in a circumferential manner around the longitudinal axis, wherein adjacent cantilevered sections of the plurality of cantilevered sections are spaced apart from each other in a circumferential manner around the longitudinal axis, and wherein each section of the plurality of cantilevered sections is multilayered;
• and
• a mass of insulating material at least partially enclosing the source electrode and the plurality of cantilevered sections;
• wherein spaces between adjacent cantilevered sections of the plurality of cantilevered sections are filled by the mass of insulating material, and wherein the spaces extend along the longitudinal axis.