An ultrasonic sensor assembly includes a flexible supporting material that has flexibility configured for allowing bending of the supporting material to conform to a cylindrical shape of a pipe. The assembly includes a plurality of operable sensor elements arranged in a matrix formation upon the flexible supporting material. The matrix formation includes a plurality of rows of the sensor elements and a plurality of columns of the sensor elements. The flexible supporting material is configured for placement of the columns of the matrix formation to extend along the elongation of the pipe and the flexible supporting material is configured for placement of the rows of the matrix formation to extend transverse to the elongation of the pipe. The flexible support material is configured to flex for positioning the sensor elements within each row in a respective arc that follows a curve of the cylinder shape of the pipe.