
Proceedings Paper
Transmission of THz pulse with a few circles through opaque samples placed at long distance (4-6 metres)Format | Member Price | Non-Member Price |
---|---|---|
$17.00 | $21.00 |
Paper Abstract
Nowadays, the detection and identification of dangerous substances at long distance (several metres, for example) by
using of THz pulse reflected from the object is an important problem. The main problem with this technique is the
absorption of THz energy by water vapor. However, using THz pulsed radiation is possible at distance of some metres
as it is well-known. Below we demonstrate possibility of THz signal measuring reflected from a flat metallic mirror
placed about 4 metres from the parabolic mirror. Investigated object is placed before this mirror. Therefore, at present
time our measurements contain features of both transmission and reflection modes. The reflecting mirror is used
because of weak averaged power of femtosecond laser. This power is about 1 W. Moreover, the laser beam splits many
times. Therefore, the averaged power falling on the THz emitter decreases at least 8 times. The pulse duration generated
by the femtosecond laser is equal to 68 fs.
Measurements were provided at room temperature and humidity about 70%. The aim of investigation was the detection
of a substance in real conditions. We discuss new features of the detection of a substance covered under various
ordinary materials and possible way for their influence deleting on the detection using reflected THz pulse.
We discuss also details of action of THz pulse with a few circles on media. The main feature of such interaction is its
dependence from absolute phase of the THz pulse. We demonstrate results of computer simulations as well as physical
experiment results for propagation of such laser pulses.
Paper Details
Date Published: 5 September 2014
PDF: 21 pages
Proc. SPIE 9199, Terahertz Emitters, Receivers, and Applications V, 91990E (5 September 2014); doi: 10.1117/12.2059763
Published in SPIE Proceedings Vol. 9199:
Terahertz Emitters, Receivers, and Applications V
Manijeh Razeghi; Alexei N. Baranov; John M. Zavada; Dimitris Pavlidis, Editor(s)
PDF: 21 pages
Proc. SPIE 9199, Terahertz Emitters, Receivers, and Applications V, 91990E (5 September 2014); doi: 10.1117/12.2059763
Show Author Affiliations
Vyacheslav A. Trofimov, Lomonosov Moscow State Univ. (Russian Federation)
Svetlana A. Varentsova, Lomonosov Moscow State Univ. (Russian Federation)
Svetlana A. Varentsova, Lomonosov Moscow State Univ. (Russian Federation)
Vladislav V. Trofimov, Lomonosov Moscow State Univ. (Russian Federation)
Published in SPIE Proceedings Vol. 9199:
Terahertz Emitters, Receivers, and Applications V
Manijeh Razeghi; Alexei N. Baranov; John M. Zavada; Dimitris Pavlidis, Editor(s)
© SPIE. Terms of Use
