Influence of the thickness of matching layers on narrow band transmitter ultrasonic airborne transducers with frequencies <100 kHz: Application of a genetic algorithm |
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| Institution: | 1. Mechanical Engineering Faculty, Amirkabir University of Technology, 424, Hafez Avenue, Tehran, Iran;2. Institut de Recherche en Génie Civil et Mécanique, Ecole Centrale de Nantes, 1 Rue de la Noë BP 92101, 44321 Nantes cedex 3, France;1. ISPRA, Italian National Institute for Environmental Protection Research, Italy;2. Department of Biology, University of Rome Tor Vergata, Rome, Italy;3. Engineering and Agri-Food Processing Research Center, Monterotondo (Rm), Italy;4. Allergology Centre, San Pietro-Fatebenefratelli Hospital, Rome, Italy;5. TPS Production srl, Italy;6. Pediatric Department & Allergology Service, Sandro Pertini Hospital, Rome, Italy;1. University François-Rabelais, GREMAN UMR 7347 CNRS, Tours, 37071, France;2. IEMN UMR 8520 CNRS, ISEN department, 59046 Lille, France;3. Thales Research & Technology, Palaiseau, 91767, France;1. Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China;2. Key Laboratory of Marine Information Acquisition and Security (Harbin Engineering University), Ministry of Industry and Information Technology, Harbin 150001, China;3. College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China;4. Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA;1. Key Laboratory of Optoelectronic Material and Device, Department of Physics, Shanghai Normal University, Shanghai, 200234, China;2. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, University of Chinese Academy of Sciences, 215 ChengbeiRoad, Jiading, Shanghai, 201800, China |
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| Abstract: | The acoustic impedances of matching layers and their thicknesses are the most important and influential parameters in the performance of airborne ultrasonic transducers. In this paper, the optimum thicknesses of the matching layers of the narrow band transmitter ultrasonic transducer regarding transmission coefficient were determined by individual calculations using a genetic algorithm. The genetic algorithm was chosen because it is a powerful tool in the optimization domain. The results show that the permitted thickness variation is 0.0005% for one matching layer, and this value can be increased to 0.0031%, which corresponds to the permitted thickness variation for five matching layers. Approximately 55% enhancement in the transmission coefficient is theoretically possible, and 42% enhancement was observed experimentally when the genetic algorithm was applied to calculate the matching layer thicknesses in place of the quarter wavelength equation that is conventionally used for the determination of layer thickness. To verify our approach, the effect of the thickness variation on the transmission coefficient has been investigated experimentally for three, four and five matching layers. The experimental results displayed good agreement with the theoretical predictions. |
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| Keywords: | Acoustic impedance Matching layers Ultrasonic transducers Genetic Algorithm (GA) |
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