The portable (0.7 kg) flaw detector AD-42 IM is intended mainly for in-service testing of multi layer structures. The instrument is based on the pulse version of MIA, has a set of three types of probes and is very easy to handle.

The AD-64 flaw detector is a universal computerized low frequency acoustic instrument, using both MIA and MFEV. The instrument consists of electronic block, set of probes and PC NOTEBOOK. In AD-64 the main way of signal processing is spectrum analysis. The set of probes includes piezoelectric probes used in MIA flaw detectors and probes with electromagnetic shock vibrators. The flaws are detected by difference between the current spectrum and the averaged spectrum of the sound area. All the setting parameters, spectra and other information can be represented on the PC display and recorded by a printer. The information can be displayed in several forms. So the operator can choose the optimum one. The settings for typical objects can be stored in memory and reproduced to avoid the use of reference blocks. All the necessary data can be stored in memory and recorded by a printer. Due to this facilities the AD-64 is very useful for NDT techniques development of new types of objects and as an arbitrary means. Certificates of tested objects can be printed too.

Spectrum analysis and combination of two NDT methods makes the AD-64 more sensitive and universal instrument, than MIA flaw detectors. With shock vibrators it can detect flaws in structures with soft external layers (e. g. rubber like materials) and fillers, having low Young moduli (e. g. plastic foam), that is difficult or impossible with MIA instruments. But AD-64 is not so portable as AD-42 IM and is not intended for in-service testing.

The set of two described flaw detectors solves many practical tasks of NDT of multi layer structures, such as honeycomb panels, propellers, antenna fairings and so on.