Dual-comb spectroscopy (DCS) is an advanced technique for precise molecular analysis using frequency combs. NIST researchers have developed DCS systems for open-path gas detection, achieving sub-minute resolution over kilometer-scale distances.
Key points:
– DCS uses two phase-locked frequency combs to measure molecular absorption
– Provides high resolution, accuracy, speed, and signal-to-noise ratio
– Deployed in open-path atmospheric measurements and quadcopter monitoring
– Potential for mid-infrared extension for detecting larger organic molecules
The technique has advantages over conventional spectrometers and could enable compact, fieldable systems for atmospheric and defense applications.
Source: https://www.nist.gov/programs-projects/frequency-comb-based-spectroscopy-dual-comb-spectroscopy
Keywords: Spectroscopy, Frequency combs, Molecular absorption, Dual-comb, Metrology
