Aerospace Instrument-Making Annotation << Back PROSPECTS OF SAW (SURFACE ACOUSTIC WAVE) SENSORS APPLICATION IN AVIATION ENGINES S.A. Zhgoon, A.S. Shvetsov, Yu.K. Smirnov, A.A. Merkulov, A.V. Rakov, V.P. Maslov, B.I. Mineev Obtaining reliable information about the physical state of the units and parts of tested aircraft engines in real time is an extremely important and complex task. Parts and components of the engine, including those rotating at high speed, experience great thermal and mechanical non-stationary loads, vibrations and deformations. Information from sensors located on the rotating rotor of the motor must be transmitted by means of contactless telemetry systems. When measured at temperatures exceeding 100…150 °C, the power for the sensors from batteries and batteries becomes problematic, as well as the use of semiconductor electronics. For this reason, it makes sense to refer to devices on surface acoustic waves (SAW) that use the energy of an external electromagnetic signal both for interrogating the sensing element and for generating a re-emitted signal containing information about the measured parameter. The principle of the operation of such devices, based on the propagation of surface acoustic waves in piezoelectric crystals at certain frequencies of the RF range (from about 10 MHz to 5 GHz), determines the natural applications in measurements of temperature, deformation, and of the level of physical effects on the surface, that effects on the SAW propagation velocity and on the dimensions of the device. The distance from the interrogating device to the passive SAW sensor can reach tens of meters. The paper refl ects the aspects of measuring the parameters of fast-changing deformations and, in particular, vibrations with the help of SAW sensors. Physical bases and experimental approaches for measuring deformations occurring during vibrations and results of comparison of output signals obtained from wireless measurements by means of a surfactant sensor and from traditional wire measurements using a strain gage are described. Key words: surface acoustic waves, SAW, deformation sensor, vibration, tensometry. Contacts: E-mail: zhgoon@gmail.com, E-mail: shvetsov_as@mail.ru, E-mail: smirnovyk@mpei.ru, E-mail: aamerkulovv@gmail.com, E-mail: allrakov@gmail.com, E-mail: gorshkov@ciam.ru, E-mail: mineev@ciam.ru Pp. 48-55.