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. In, Fotakis, Costas, Pezzati, Luca and Salimbeni, Renzo (eds.) O3A: Optics for Arts, Architecture, and Archaeology. O3A: Optics for Arts, Architecture, and Archaelology Bellingham, USA, Society of Photo-Optical Instrumentation Engineers, 6618F-[10pp]. (Proceedings of SPIE, 6618). (doi:10.1117/12.726189).

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Original Publication URL: http://dx.doi.org/10.1117/12.726189

Description/Abstract

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 1μm, but that this error has a significant impact on the evaluation of the radius. Recommendations are made on methods for optimisation of sensor performance.

Item Type: Book Section
Additional Information: ISSN 0277-786X
Related URLs:
Subjects: C Auxiliary Sciences of History > CC Archaeology
T Technology > TA Engineering (General). Civil engineering (General)
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 48328
Date Deposited: 06 Nov 2007
Last Modified: 27 Mar 2014 18:32
URI: http://eprints.soton.ac.uk/id/eprint/48328

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