Handheld terahertz spectrometer for the detection of liquid explosives

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

doi:10.1117/12.830381

17 September 2009 Handheld terahertz spectrometer for the detection of liquid explosives

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

Author Affiliations +

Proceedings Volume 7485, Millimetre Wave and Terahertz Sensors and Technology II; 748504 (2009) https://doi.org/10.1117/12.830381
Event: SPIE Security + Defence, 2009, Berlin, Germany

Abstract

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 container.

Citation Download Citation

N. Krumbholz, C. Jansen, M. Scheller, T. Müller-Wirts, S. Lübbecke, R. Holzwarth, R. Scheunemann, R. Wilk, B. Sartorius, H. Roehle, D. Stanze, J. Beckmann, L. S. von Chrzanowski, U. Ewert, and M. Koch "Handheld terahertz spectrometer for the detection of liquid explosives", Proc. SPIE 7485, Millimetre Wave and Terahertz Sensors and Technology II, 748504 (17 September 2009); https://doi.org/10.1117/12.830381

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