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Handheld terahertz spectrometer for the detection of liquid explosives

: Krumbholz, N.; Jansen, C.; Scheller, M.; Müller-Wirts, T.; Lübbecke, S.; Holzwarth, R.; Scheunemann, R.; Wilk, R.; Sartorius, B.; Roehle, H.; Stanze, D.; Beckmann, J.; Chrzanowski, L.S. von; Ewert, U.; Koch, M.


Krapels, K.A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Millimetre Wave and Terahertz Sensors and Technology II : 1-3 September 2009, Berlin, Germany
Bellingham, WA: SPIE, 2009 (Proceedings of SPIE 7485)
ISBN: 978-0-8194-7791-0
Art. 748504
Conference "Millimetre Wave and Terahertz Sensors and Technology" <2, 2009, Berlin>
Conference Paper
Fraunhofer HHI ()

We present a handheld fiber-coupled terahertz spectrometer operating at a center wavelength of 1550 nm. The key elements are a fs-fiber laser, a fiber stretcher delay line and fiber-coupled antennas, which contain novel InAlAs-InGaAs multi layer chips. First experimental data obtained with this system demonstrates its great potential and robustness. In addition, we investigate different hazardous and harmless liquids in reflection geometry. These experiments show that liquids are in principle distinguishable by terahertz spectroscopy. Finally, first steps towards an algorithm that allows for an extraction of the liquids dielectric properties are discussed. The algorithm works for the analysis of reflection data even if the liquid is located inside a containner.