THz Reflection Spectra of Different Materials, Including Explosives, Measured at a Distance up to 5 m

• Authors: M. Walczakowski , N. Palka , A. Czerwiński , M. Sypek , M. Szustakowski
• Languages of publication: EN

Abstracts

EN

This work presents a terahertz system designed for the reflection spectroscopy of different materials located at a distance up to 5 m. The source of the radiation is a tunable solid-state optical parametric oscillator, which generates a narrow-band nanosecond pulses in the range of 0.7-2.5 THz. The signal is detected with relatively fast and having big sensitivity hot electron bolometer. The detailed description of each device and the functioning of the experimental setup are provided as well as the methodology of the measurement is explained. Investigations were performed in the 0.7-2.2 THz range in free space with relative humidity of about 40%. The experiment was divided into three series, each of which was carried out with different distance between the examined sample and the system - 1 m, 3 m, and 5 m. Obtained spectra of selected materials, including explosives, are similar to the results received from a purged time domain spectroscopy system. The observed small deviations are connected with fluctuations of the laser wavelength and the instability of the bolometer.

Keywords

EN

06.60.Ei; 07.57.Hm; 07.57.Kp; 07.57.Pt; 33.20.Ea

Discipline

• 06.60.Ei: Sample preparation (including design of sample holders)
• 07.57.Kp: Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors(see also 85.60.Gz Photodetectors in electronic and magnetic devices, and 95.55.Rg Photoconductors and bolometers in astronomy)
• 33.20.Ea: Infrared spectra
• 07.57.Hm: Infrared, submillimeter wave, microwave, and radiowave sources(see also 42.72.Ai Infrared sources in optics)
• 07.57.Pt: Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 3
• Pages: 689-692

Dates

published

2015-03

received

2014-05-12

Contributors

author

M. Walczakowski

• Institute of Optoelectronics, Military University of Technology, S. Kaliskiego 2, 00-908 Warszawa, Poland

author

N. Palka

• Institute of Optoelectronics, Military University of Technology, S. Kaliskiego 2, 00-908 Warszawa, Poland

author

A. Czerwiński

• Warsaw University of Technology, Koszykowa 75, 00-662 Warszawa, Poland

author

M. Sypek

• Warsaw University of Technology, Koszykowa 75, 00-662 Warszawa, Poland

author

M. Szustakowski

• Institute of Optoelectronics, Military University of Technology, S. Kaliskiego 2, 00-908 Warszawa, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.127.689