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The relationship between surface incline and con-focal chromatic aberration sensor response

McBride, J.W., Boltryk, P.J. and Zhao, Z., (2007) The relationship between surface incline and con-focal chromatic aberration sensor response Fotakis, Costas, Pezzati, Luca and Salimbeni, Renzo (eds.) In O3A: Optics for Arts, Architecture, and Archaeology. vol. 6618, Society of Photo-Optical Instrumentation Engineers. 10 pp, 6618F-[10pp]. (doi:10.1117/12.726189).

Record type: Conference or Workshop Item (Paper)


The limiting performance characteristics of con-focal chromatic aberration displacement sensors are angular tolerance and the gauge range over which an output is provided. The sensor selected in this study is used to measure groove profiles in early recorded surfaces. The sensor is used in a 3 dimensional cylinder scanning system for the measurement of wax cylinder recordings, where the 3 dimensional data is used to create a map of the measured surface for archival purposes. The generation of the map allows the sound recorded on the surface to be decoded without physical contact to the surface.

It has been shown in a previous study that data resolution of 10-20nm are required for this application, and that the relationship between the data output and the surface incline is critical to system performance. To understand the relationship with surface slope the sensor is used here in a study of the measurement of calibration ball surfaces, and follows a previous study on machined grooves with known angular properties. In this study a range of calibration spherical surfaces are used to investigate the relationship between the sensor output and measurement parameters, including the distance between the sensor optical head and the surface. A linear least squares method is used to evaluate the 3D radius of the measured surfaces, and this is used as a parameter to evaluate the systematic errors.

The results show that there is a low level of systematic form error typically below 1?m, but that this error has a significant impact on the evaluation of the radius. Recommendations are made on methods for optimisation of sensor performance.

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Published date: 16 July 2007
Additional Information: ISSN 0277-786X
Venue - Dates: O3A: Optics for Arts, Architecture, and Archaelology, 2007-06-20 - 2007-06-20


Local EPrints ID: 48328
PURE UUID: 8099d0a8-b722-4c95-a2c8-a37ca05dd45b

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Date deposited: 06 Nov 2007
Last modified: 17 Jul 2017 15:00

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Author: J.W. McBride
Author: P.J. Boltryk
Author: Z. Zhao
Editor: Costas Fotakis
Editor: Luca Pezzati
Editor: Renzo Salimbeni

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