Trond Løke and Ivar Baarstad both work in the company NEO who have built the hyperspectral camera and PryJector setup from specifications provided by Bjørn K. Alsberg. Professor Alsberg is not associated with NEO.
TECHNICAL NOTE CRIMINALISTICS
PryJector: A Device for In Situ Visualization of Chemical and Physical Property Distributions on Surfaces Using Projection and Hyperspectral Imaging,†
Article first published online: 21 MAR 2011
© 2011 American Academy of Forensic Sciences
Journal of Forensic Sciences
Volume 56, Issue 4, pages 976–983, July 2011
How to Cite
Alsberg, B. K., Løke, T. and Baarstad, I. (2011), PryJector: A Device for In Situ Visualization of Chemical and Physical Property Distributions on Surfaces Using Projection and Hyperspectral Imaging,†. Journal of Forensic Sciences, 56: 976–983. doi: 10.1111/j.1556-4029.2011.01747.x
Funding provided by the Norwegian Research Council and the Department of Chemistry at NTNU.
- Issue published online: 5 JUL 2011
- Article first published online: 21 MAR 2011
- Received 31 Aug. 2009; and in revised form 27 May 2010; accepted 5 June 2010.
- forensic science;
- hyperspectral analysis;
- in situ visualization;
- chemical imaging;
- chemical images;
- near-infrared spectroscopy;
Abstract: Traditional forensic methods that highlight the spatial distribution of properties such as blood and fingerprints have two main disadvantages: they often apply chemicals that may influence further analyses, and they cannot easily be modified to search for new compounds/properties. A new instrument (called PryJector) avoids these problems by dynamically projecting back onto the surface under study spatially distributed information of compounds/properties (chemical images) obtained from multivariate analysis of hyperspectral images. Selectivity to target compounds/properties is ensured by multivariate modeling which makes the instrument much more flexible compared to traditional methods. The functionality of the PryJector is demonstrated in an application related to the detection of counterfeit pharmaceuticals where compounds otherwise indistinguishable to the human eye are made clearly visible by projection of false-colored chemical images. The PryJector is shown to be a noninvasive and very flexible instrument for highlighting spatial distributions of various compounds/properties.