Lodeiro, M J (2019) Feasibility of Using Scanning Acoustic Microscopy to Provide Large Area, High Spatial and Thickness Resolution Measurements of Flexible Polymeric Thin Films. NPL Report. MAT 87

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Abstract

This report details work carried out to determine the feasibility of high spatial and thickness resolution measurements of flexible polymeric thin films using immersion-based scanning acoustic microscopy (SAM). In principle, by measuring the ultrasonic time of flight (ToF) normal to the film surface and using the ultrasonic velocity of the material, the thickness of the film at any point can be determined. This work aims to verify the methodology and identify issues in the characterisation of film thickness or mapping which may contribute to uncertainty. A mid-range frequency/resolution scanning acoustic microscope system (75 MHz and 100 µm) was used in a variety of imaging modes, yielding signal intensity images, as well as cross-sectional slices, to maximise characterisation of the film surface topography and thickness distribution. The thickness maps generated using acoustic microscopy were verified and validated using appropriate calibration artefacts and estimates made of the measurement errors and their sources.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MAT 87
Keywords:	scanning acoustic microscopy; thickness mapping; calibration; ultrasonics;uncertainty determination
Subjects:	Advanced Materials > Non-Destructive Testing
Divisions:	Engineering
Last Modified:	19 Sep 2019 09:34
URI:	http://eprintspublications.npl.co.uk/id/eprint/8507

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