Tuesday, 10 September 2013

Extension of the p-Spectrum Method to the Higher Frequencies


N. Palka
Institute of Optoelectronics, Military University of Technology, S. Kaliskiego 2, 00-908 Warsaw, Poland

Abstact
The p-spectrum method is a time domain spectroscopy-based technique for re flection analysis of materials (including explosives) that takes into account only part of the re flected signal, which is next analyzed via the Fourier transform. The method is limited to the frequencies of about 1.8 THz due to the pulse properties of our time domain spectroscopy setup. In this paper we theoretically prove that application of a shorter pulse can increase this frequency range up to 2.2 THz, that enables analysis of penthrite and octogen, two important explosives.

THz Pulsed Imaging and SpectroscopyACTA PHYSICA POLONICA A Vol. 124(3) 543 (2013)

..........The proposed TDS-based p-spectrum method uses an external free standing module with a fiber-fed emitter and detector (Fig. 1a). This module is connected to the core unit of the Spectra 3000 from Teraview Company by means of optical fibers. The THz beam thanks to a set of the o -axis parabolic and at mirrors is focused on the sample and after specular re flection is collected and focused on the detector.   ..............

see full paper at http://przyrbwn.icm.edu.pl/APP/PDF/124/a124z3p40.pdf