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A Compact Circular Multipass Cell for Millimeter-Wave/Terahertz Gas Spectroscopy

Rothbart, Nick and Hübers, Heinz-Wilhelm and Schmalz, K. (2020) A Compact Circular Multipass Cell for Millimeter-Wave/Terahertz Gas Spectroscopy. IEEE Transactions on Terahertz Science and Technology, 10 (1), pp. 9-14. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TTHZ.2019.2950123. ISSN 2156-342X.

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Official URL: https://ieeexplore.ieee.org/document/8884743?source=authoralert


Millimeter-wave/terahertz (mmW/THz) spectroscopy is a promising tool for gas sensing applications, such as breath analysis or the detection of toxic chemicals, which require compact portable systems. Long gas cells that are needed for high sensitivities are often bulky and limit the portability of the system. We present a compact mmW/THz circular multipass gas cell with an optical path length of 1.9 m and an outer diameter of only 21.5 cm. The beam is refocused at each internal reflection as a consequence of the large divergence of the mmW/THz beams. We determined the losses of the cell to about 3 dB around 250 GHz and demonstrated sensitive gas spectroscopy with a detection limit of 14 ppm/√Hz for acetaldehyde in a mixture with methanol.

Item URL in elib:https://elib.dlr.de/133247/
Document Type:Article
Title:A Compact Circular Multipass Cell for Millimeter-Wave/Terahertz Gas Spectroscopy
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rothbart, NickNick.Rothbart (at) dlr.deUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Schmalz, K.IHP Frankfurt, OderUNSPECIFIED
Date:January 2020
Journal or Publication Title:IEEE Transactions on Terahertz Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1109/TTHZ.2019.2950123
Page Range:pp. 9-14
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Terahertz, Millimeterwellen, Gasspektroskopie
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Rothbart, Nick
Deposited On:08 Jan 2020 08:38
Last Modified:08 Jan 2020 08:38

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