Abstract. The article presents the results of an analysis of regulatory documents governing the application of ultrasonic diagnostic methods for machines and mechanisms, as well as a comparison with current standards in the field of acoustic frequencies. This approach made it possible to identify differences between areas of application and to determine the possibilities of practical use of existing standards in the development of new diagnostic devices. Special attention is given to the review of ultrasonic frequency measuring instruments currently available on the market. It was found that most of these devices have limited functional capabilities and a high cost. For example, some instruments are capable of detecting ultrasonic signals and indicating the direction of their source; however, visualization is limited to displaying a localized point, which does not allow the recording of physical parameters of the signal or the dynamics of its propagation in the medium. These limitations significantly reduce the potential for comprehensive diagnostics. The main objective of the article is to establish requirements for the characteristics of a next-generation device for ultrasonic diagnostics of mechanisms, which should combine the functions of recording frequency parameters and spatial visualization of the ultrasonic field. It is shown that existing devices are focused only on detecting the signal source. The need for developing new-generation instruments is substantiated. Such instruments would enable the visualization of the ultrasonic field in space and ensure more comprehensive diagnostics of machines and mechanisms, including early detection of hidden defects and potential failures. For the aviation industry, meeting these requirements is of particular importance, as it is directly related to ensuring a high level of flight safety.

Keywords: ultrasonic diagnostics, nondestructive testing (NDT), aviation safety, MEMS microphones, technical diagnostics, coustic visualization, instrument requirements, mechanism reliability.