מדידות מפולגות של מאמצים בחלקי חומרים מרוכבים באמצעות חיישנים סיב-אופטיים

Monitoring of composite material structures using distributed fiber-optic sensors 

תיאור הפרויקט:

Composite materials consist of strength members that are embedded in a polymer matrix. Compared with traditional materials, composites may be stronger, lighter or less expensive. Most structural health monitoring (SHM) protocols are based on the loading of the structure under test, and the interrogation of electrical strain gauges that are attached to the structure at a discrete set of pre-planned locations. Sensors of strain and temperature based on optical fibers are being developed for over 30 years . They provide distributed measurements of strain over many km. Over the last three years, the Zadok group and collaborators have proposed and demonstrated a novel type of fiber sensor, which relies on elaborate radar-like coding of the optical waveforms. The sensor allows for distributed measurements of strain over nealry 10 km of fiber, and with 2 cm resolution. The sensor system had recently been applied to the monitoring of composite material beams

תכולת הפרויקט:

Students will study the underlying optical mechanism of stimulated Brillouin scattering, which is employed in the sensor setup, and the pervious works in our group in this area. They will be trained in the operation of the measurement setup, and perform numerical analysis that is replicating the experimental procedures. Lastly, comprehensive experimental characterization of composite material airplane wings will be carried out, subject to different loading conditions           

דרישות:    

Electro-optics track is mandatory. Signal processing track is an advantage. Experience in matlab is an advantage. Willingness to work hard is absolutely mandatory. Interest in learning a complex laboratory setup      

מקורות:

1.    D. Elooz, Y. Antman, N. Levanon, and A. Zadok, "High-resolution long-reach distributed Brillouin sensing based on combined time-domain and correlation-domain analysis," Optics Express 22, 6453-6463 (2014). 29. Y. London, Y. Antman, R. Cohen, N. Kimelfeld, N. Levanon, and A. Zadok, "High-resolution long-range distributed Brillouin analysis using dual-layer phase and amplitude coding," Optics Express 22, 27144-27158 (2014). A. Zadok et al., "High-resolution distributed fiber-optic monitoring of composite beams production," (unpublished). Available upon request  

דוא"ל:

Avinoam.Zadok@biu.ac.il