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Air-coupled linear and sparse cMUT array manufactured using MUMPs process

Octavio, Alberto and O'Leary, Richard L. and Whiteley, Simon M. and Martínez- Graullera, Óscar and Martín-Arguedas, Carlos and Gómez-Ullate, Luis and Montero de Espinosa, Francisco (2011) Air-coupled linear and sparse cMUT array manufactured using MUMPs process. Microsystem Technologies, 17 (10-11). pp. 1635-1644. ISSN 0946-7076

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Abstract

An assessment of the standard fabrication Micro-Electro-Mechanical Systems (MEMS) process Multi-User MEMS Processes (MUMPs) for complex air-coupled capacitive Micromachined Ultrasonic Transducer array aperture manufacture is reported. A 1-D linear array and a 2-D sparse symmetric binned-array have been designed and manufactured, and then characterised experimentally using electrical impedance measurements, laser vibrometry and air-coupled field measurement; the experimental data are supported by simulated data using Finite Element technique and field simulation based on Huygens’ principle. A methodology for the manufacture of the array structures using the MUMPs process is described. Electrical characterisation shows the devices operation at 770 kHz and the existence of large parasitic capacitances and electrical losses. Mechanical crosstalk of array substrate has been measured at -40 dB using laser vibrometry. Moreover, the laser vibrometry measurement and the field characteristics of one element reveal that each element operates as a piston radiator.

Item type: Article
ID code: 34338
Keywords: MEMS, MUMPs, capacitive micromachined ultrasonic transduser, ultrasonic array design, sparse array, air coupled ultrasound, field modelling, array cross talk, Manufactures, Hardware and Architecture, Electronic, Optical and Magnetic Materials, Electrical and Electronic Engineering, Condensed Matter Physics
Subjects: Technology > Manufactures
Department: Faculty of Engineering > Electronic and Electrical Engineering
Technology and Innovation Centre > Sensors and Asset Management
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Depositing user: Pure Administrator
Date Deposited: 12 Oct 2011 14:57
Last modified: 27 Mar 2014 09:41
URI: http://strathprints.strath.ac.uk/id/eprint/34338

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