Can the THz-TDS detect trace gases?

TL;DR

This paper explores the potential of THz-TDS technology to detect trace gases at sub-ppm levels, developing a quantitative model for gas concentration measurement and proposing a foundation for multispecies detection.

Contribution

It introduces a novel quantitative approach for trace gas detection using THz-TDS and establishes a basis for multispecies gas sensing schemes.

Findings

Successful detection of trace gases at sub-ppm levels

Development of a single-parameter quantification model

Reference experiments for future multispecies detection

Abstract

The THz-TDS is a versatile technique and can be used to probe gas phase molecules. We are pushing the technique to its limit to try and detect trace gases at the sub-ppm levels. The experiments served as a reference for a quantitative approach that permits to extract the concentration of a probed gas. The single-parameter quantification model can be considered as the basis for a wider multispecies detection scheme.