Heterodyne Method of Detection of Molecular Gas in the Terahertz Region Using the Beats between Free Induction Decay Signals

Evgeniy N. Chesnokov, Vitaliy V. Kubarev, Pavel V. Koshlyakov, Valentin V. Fedorov

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The method of detection of molecular gas in the terahertz region using the free induction decay (FID) signal was tested. FID signal was recorded in real time after the pulse of free electron laser. To achieve linearity of the measured signal on the gas concentration, mixing with monochromatic reference FID was used. The beats of measured FID and reference FID were separated by a band-pass filter. It was shown that the energy of the beat signal can be equal to the absorbed energy. The method was tested for detecting methyl fluoride CH3F, hydrogen bromide HBr and methanol molecules. Hydrogen cyanide HCN was used as a source of reference FID.

Original languageEnglish
Article number7851041
Pages (from-to)144-150
Number of pages7
JournalIEEE Transactions on Terahertz Science and Technology
Volume7
Issue number2
DOIs
Publication statusPublished - 1 Mar 2017

Keywords

  • Free induction decay (FID)
  • Novosibirsk free electron laser
  • terahertz (THz)

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