Fluidless roller probe device

A drum sensor for a device for performing structural integrity testing, comprising:

• a shaft;
• a barrel-shaped inner portion mounted on the shaft;
• a sensor array having a plurality of transmit elements and a plurality of receive elements, the transmit elements separate from the receive elements, the transmit elements positioned perpendicular to the receive elements, the sensor array positioned on an outer surface of the barrel-shaped inner portion;
• an outer portion positioned over the sensor array;
• and
• wherein the plurality of transmit elements are arranged in parallel to each other around a circumference of the outer surface of the barrel-shaped inner portion and the plurality of receive elements are arranged parallel to each other and perpendicular to the circumference of the outer surface of the barrel-shaped inner portion, each of the plurality of receive elements extending across the outer surface of the barrel-shaped inner portion.

A method for performing structural integrity testing, comprising the steps of:

• receiving an input signal from a shaft encoder coupled to a drum sensor, the drum sensor having a shaft, a barrel-shaped inner portion mounted on the shaft, a sensor array positioned on an outer surface of the barrel-shaped inner portion and having a plurality of transmit elements and a plurality of receive elements, the transmit elements separate from the receive elements, the transmit elements positioned perpendicular to the receive elements, the plurality of transmit elements arranged in parallel to each other around a circumference of the outer surface of the barrel-shaped inner portion and the plurality of receive elements arranged parallel to each other and perpendicular to the circumference of the outer surface of the barrel-shaped inner portion, each of the plurality of receive elements extending across the outer surface of the barrel-shaped inner portion, and an outer portion positioned over the sensor array, the input signal providing an indication of a position of the drum sensor with respect to a surface of a part under test;
• identifying, based on the input signal from the shaft encoder, a transmit element among the plurality of transmit elements closest to the surface of the part under test;
• activating only the identified transmit element;
• receiving an input signal from each of a plurality of receive elements;
• and
• calculating an output signal based on the received input signals from the plurality of receive elements.