Development of an electrostatic method of nondestructive testing with high noise immunity

Abstract

New electrostatic method of nondestructive testing with high noise immunity for a wide range of materials and structures, dielectrics and conductive materials without using contact liquid is proposed in the paper. A block diagram of the device to use this method in the field of nondestructive testing is provided.The method includes generating electrostatic field by supplying a reference signal with a given frequency to one pair of electrodes, registering induced charge using another measuring electrodes, and multiplying reference and measuring signals with further processing and visualization of results on the screen. The method involves two-axis scanning of the control object. Moreover, the measuring signal is defined as the difference of output signals of two pairs of measuring electrodes.Using the proposed nondestructive testing allows to test products under normal laboratory conditions without using special facilities and special screening means. The results of experiments confirm that under normal laboratory conditions, the level of noise from power supply networks exceeds the level of the useful signal by more than 40 dB, which prevents the realization of the known testing under such conditions. Testing can be conducted with one-way access to the control object.