A Compact Circular Multipass Cell for Millimeter-WaveTerahertz Gas Spectroscopy

被引：29

作者：

Rothbart, Nick ^{[1
,2
]}

Schmalz, Klaus ^{[3
]}

Hubers, Heinz-Wilhelm ^{[1
,2
]}

机构：

[1] German Aerosp Ctr DLR, Inst Opt Sensor Syst, D-12489 Berlin, Germany

[2] Humboldt Univ, Dept Phys, D-12489 Berlin, Germany

[3] IHP Leibniz Inst Innovat Mikroelekt, D-15236 Frankfurt, Oder, Germany

来源：

IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY | 2020年 / 10卷 / 01期

关键词：

Lenses; Spectroscopy; Reflection; Interference; Apertures; Mirrors; Sensitivity; Gas detector; millimeter wave technology; spectroscopy; terahertz radiation; COMB SPECTROMETER; CIGARETTE-SMOKE; TERAHERTZ; SUBMILLIMETER; PATHS;

D O I：

10.1109/TTHZ.2019.2950123

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Millimeter-waveterahertz (mmWTHz) spectros-copy 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 mmWTHz circular multipass gas cell with an optical path length of 1.9m and an outer diameter of only 21.5cm. The beam is refocused at each internal reflection as a consequence of the large divergence of the mmWTHz beams. We determined the losses of the cell to about 3dB around 250GHz and demonstrated sensitive gas spectroscopy with a detection limit of 14ppm root Hz for acetaldehyde in a mixture with methanol.

引用

页码：9 / 14

页数：6

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