High sensitivity non-contact method for dynamic quantification of elastic waves and strains in transparent media |
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| Affiliation: | 1. National Engineering Research Center of Flat Rolling Equipment, University of Science and Technology Beijing, Beijing 100083, PR China;2. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400030, PR China;3. Department of Engineering, University of Glamorgan, Pontypridd CF37 1DL, UK;1. Automatic Test and Control Institute, School of Information and Electrical Engineering, Harbin Institute of Technology at WeiHai, WeiHai, China;2. Automatic Test and Control Institute, School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin, China;3. Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin, China;1. Politecnico di Torino, Dipartimento di Elettronica e Telecomunicazioni, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy;2. Politecnico di Torino, Dipartimento Energia, Italy;3. Politecnico di Bari, Dipartimento di Ingegneria Elettrica e dell’Informazione, Italy;1. Instituto de Telecomunicações, DEEC, IST, UL, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal;2. Instituto de Telecomunicações, Universidade de Évora, Rua Romão Ramalho 59, 7000-671 Évora, Portugal |
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| Abstract: | This paper presents time resolved quantitative evaluation of elastic stress waves in solid media by utilising an adaptation of the well-established laser Doppler vibrometry method. We show that the introduction of elastic stress waves in a transparent medium gives rise to detectable and quantifiable changes in the refractive index, which is proportional to stress. The method is tested for mechanical excitation at frequencies from 10 to 25 kHz in an acrylic bar. This refractometric quantification can measure internal strains as low as 1 × 10−11. Additionally, finite element analysis is conducted to gauge the validity of the results. In the presented work an acrylic bar is used, this method however should be applicable to any transparent solid. |
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| Keywords: | Laser Doppler vibrometry Refracto-vibrometry Stress waves Refractive index |
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