City Research Online

Abstract

Having good control over the speed and direction of non-contact transportation is critical in industry today, especially in areas such as the manufacturing of flat panel displays, silicon wafers of semi-silicon and a number of other electronic devices. In a dual transducer-type ultrasonic levitation-based transportation system, it is well known that the vibrating plate length and the wavelength of the flexural vibration should satisfy a strict relationship, i.e. one given by the spatial phase difference, ϕ, so that the transportation process could be as fast as possible and therefore most effective for industry. However, it is difficult to obtain the value of ϕ through calculation, or through making adjustments during the operation of the transportation process. In this paper, the relationship across the temporal phase shift, θ, the spatial phase difference, ϕ, and the Standing Wave Ratio (SWR), which directly controls the speed and direction of the transportation system, was derived by the authors for the first time. Subsequently, experimental solutions for the measurement of ϕ were obtained in this work, using a Laser Doppler Vibrometer-based approach (LDV) and as a result, the research has been successful in giving results for ϕ, through the series of experiments carried out and reported.

Publication Type:	Article
Additional Information:	© 2022. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords:	Dual transducer-type levitation-based transportation system, LDV-based measurements, Measurement of the spatial phase difference, Temporal phase shift
Subjects:	Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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