FLAUT: a mutual sensitivity improvement throughmatched pipe, cavity and thin plate resonance

Abdul Hamid, Syamsul Bahrin (2021) FLAUT: a mutual sensitivity improvement throughmatched pipe, cavity and thin plate resonance. ELEKTRIKA: Journal of Electrical Engineering, 20 (2). pp. 42-48. E-ISSN 0128-4228

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Abstract

Electrostatic transducers promises a great potential in alternative to piezoelectric transducer based on certain advantages such as inherently wide bandwidth and good acoustic matching toair due to the membrane’s low acoustics impedance. There are two basic designs that are popular among electrostatic ultrasonic transducer developer –rigid backplate and micromachine backplate. This paper presents a methodology for improving the sensitivity of an air-coupled ultrasonic transducer by coupling the resonating thin plate, cavity and pipe in a single cell. The proposed device is termed Fluidically Amplified Ultrasonic Transducer (FLAUT) for an air-coupled application. Investigation of the concept of matched thin plate, cavity and pipe, of which the individual geometry is expected to mutually enhance one another. Analytical modelling is utilized to the matched thin plate, cavity and pipe. The analytical modelling identifies therequired geometry for the FLAUT based on the matched operating resonant frequency of 25 kHz. At the end of the paper the prototype of FLAUT is presented where the device was fabricated using additive manufacturing process (3-D printing) which consist of a 50 μm Kapton thin film over a micro stereolithography designed backplate. Here aluminum is coated as the electrode utilizing the thermal evaporation process for both the Kapton film and the backplate. A laser interferometer is utilized to measure FLAUT thin plate displacement which indicates the device is running at 25 kHz fundamental mode. A 30 dB difference is also observed between the deformation velocity of thecavity active region and its surrounding

Item Type:	Article (Journal)
Additional Information:	5306/92850
Uncontrolled Keywords:	Ultrasonic Amplification, Electrostatic Ultrasonic Transducer, Fluidic Amplification, Capacitive Ultrasonic Transducers
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Mechatronics Engineering Kulliyyah of Engineering
Depositing User:	Syamsul Bahrin Abdul Hamid
Date Deposited:	07 Oct 2021 11:22
Last Modified:	07 Oct 2021 11:22
URI:	http://irep.iium.edu.my/id/eprint/92850

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