Mid-IR Spectroscopy in a Hollow Fiber Gas Cell
In collaboration with scientists at the Pacific Northwest National Laboratory (PNNL), OptoKnowledge is utilizing proprietary hollow fiber technology to develop new, innovative sensors for isotope and trace-gas analysis. The hollow fiber acts as a gas cell, as well as a light-pipe that guides a tunable Mid-IR laser beam to a detector. As the laser wavelength is swept through molecular absorption features, accurate concentrations of various constituents can be determined. This concept, referred to as a capillary absorption spectrometer (CAS), enables high precision measurements within the ultra-small volume (~ 0.1 ml) of the hollow core fiber optic.
Example system designed for remote, in-situ carbon and sulfur isotope analysis.
J.F. Kelly, R.L. Sams, T.A. Blake, M. Newburn, J. Moran, M.L. Alexander, and H. Kreuzer, “A capillary absorption spectrometer for stable carbon isotope (13C/12C) analysis in very small samples,” Rev. Sci. Inst. 83, (2012).