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Colour moire interferometry for physical sensing using a standard web camera
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
2010 (English)In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 21, no 10, 105305- p.Article in journal (Refereed) Published
Abstract [en]

Digital moire patterns are an effect seen in digital pictures when a high-contrast periodic object being imaged interferes with the periodic image detector in the camera. This is often an undesired effect, which is usually removed through various filtering processes. However in this work we demonstrate the ability to use a deliberately created moire pattern to measure the physical distance of an object from a web camera with a resolution of 131 mu m. This measurement principle is then adapted to measure weight as a ubiquitous scale with a resolution of 240 mu g.

Place, publisher, year, edition, pages
Iop Publishing Ltd , 2010. Vol. 21, no 10, 105305- p.
Keyword [en]
interference, speckle and moire patterns, image forming and processing, optoelectronic device characterization, design and modelling
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-60233DOI: 10.1088/0957-0233/21/10/105305ISI: 000281787100022OAI: diva2:355866

Original Publication: Stephen Macken and Daniel Filippini, Colour moiré interferometry for physical sensing using a standard web camera, 2010, MEASUREMENT SCIENCE and TECHNOLOGY, (21), 10, 105305. Copyright: Iop Publishing Ltd

Available from: 2010-10-08 Created: 2010-10-08 Last updated: 2015-06-01
In thesis
1. Integrated Optical Solutions for Ubiquitous Sensing
Open this publication in new window or tab >>Integrated Optical Solutions for Ubiquitous Sensing
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Ubiquitous chemical sensing aims at exploiting consumer electronic devices as temporary chemical sensing platforms. These devices are a highly disseminated infrastructure, not presently being exploited for chemical sensing purposes. The goal of the ubiquitous chemical sensing field is to create the methodologies and adapted devices to profit from this unexploited resource.

DVD drives, flat bed scanners and computer screens used in combination with web cameras, and mobile phones have been demonstrated as measuring platforms, during the past 10 years.

In particular the combination of computer screens with web cameras, a technique called the computer screen photo-assisted technique (CSPT), is the most versatile approach to support multiple types of optical detection phenomena, and together with mobile phones are the most ubiquitous type of platforms.

The versatility of CSPT comes from the ease with which one can configure a spectrally controlled, 2D micro-positioned, linearly polarized, wide angle and internally modulated illumination with a programmable screen, just by controlling the displayed contents. Concurrently, the imaging devices in CSPT enable one to capture arbitrary assay layouts, the evaluation of which can then be numerically customized.

The full exploitation of the CSPT platform requires optically adapted sensing interfaces and specialized methods, in order to increase sensitivity and make use of all available information, for a thorough and complete chemical sensing analysis. In this thesis I have explored the foundations of CSPT sensing on integrated devices, developing methods and sensing’s interfaces that provide enhanced optical detection customized to the CSPT platform.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2010. 63 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1355
National Category
Natural Sciences
urn:nbn:se:liu:diva-63709 (URN)978-91-7393-269-1 (ISBN)
Public defence
2010-12-15, Plank, E-huset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Available from: 2010-12-30 Created: 2010-12-30 Last updated: 2011-01-03Bibliographically approved

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