SPATIAL ORIENTED METHOD OF DETERMINING STRAINFOR THE PREVENTION OF ACCIDENTS 

Shchevelev Anton Sergeevich, candidate of technical sciences, senior staff scientist, Scientific-research Institute of physical measurements (8/10 Volodarskogo street, Penza, Russia), ntonfbg@gmail.com
Savenkov Aleksandr Valer'evich, engineer, Scientific-research Institute of physical measurements (8/10 Volodarskogo street, Penza, Russia), nik2@niifi.ru
Ryazantsev Dmitriy Andreevich, engineer, Scientific-research Institute of physical measurements (8/10 Volodarskogo street, Penza, Russia), nik2@niifi.ru

681.7.08

10.21685/2307-5538-2017-3-5

Background. The object of the study is a method for determining the deformation to prevent of emergency situations in products of rocket and space and aircraft. The subject of the study is the method of early detection of damage implemented on the methods of acoustic and ultrasonic non-destructive testing. The method is based on the features of the in-teraction of the Lamb wave and fiber Bragg gratings. The aim of the paper is to determine the ways to effectively implement a spatially-oriented method for determining deformation.
Materials and methods. The generalized requirements from the measuring system are determined on the basis of the proposed method, affecting the metrological and operational characteristics of the sensitiv  elements. The analysis of methods of interrogation and decoding of deformation measurements results is carried out. Advantages and disadvantages of high-speed methods of wavelength survey are evaluated.
Conclusions. Recommendations are given for achieving maximum efficiency of the method, by constructing a measuring system on fiberoptic components. In particular, the use of optical fiber with a coating of graphite plastic, as a source of acoustic waves. This solution increases the sensitivity to the measured strain and temperature parameters. The choice of the method of interrogation of FBD sensors based on the measured frequency is substantiated. With a measurement frequency of up to 1 kHz, it is advisable to use a tunable Fabry-Perot optical filter, for a frequency of 1 MHz or higher, the use of a laser diode or a tunable laser. In turn, a tunable laser will allow simultaneous measurement of both static and dynamic deformation. Recommendations are given on the application of the method in products of rocket and space and aviation equipment.

Lamb wave, fiber bragg gratings, lattice-based array waveguides, piezoelectric source, acoustic wave