Affiliation:
1. Quebec City
2. University of Colorado Boulder
3. Universite Laval
Abstract
Operation of any dual-comb spectrometer requires digitization of the interference signal before further processing. Nonlinearities in the analog-to-digital conversion can alter the apparent gas concentration by multiple percent, limiting both precision and accuracy of this technique. This work describes both the measurement of digitizer nonlinearity and the development of a model that quantitatively describes observed concentration bias over a range of conditions. We present hardware methods to suppress digitizer-induced bias of concentration retrievals below 0.1%.
Funder
Air Force Office of Scientific Research
National Aeronautics and Space Administration
National Institute of Standards and Technology
Subject
Atomic and Molecular Physics, and Optics