Absorption spectroscopy in hollow-glass waveguides using infrared laser diodes
Hollow-glass waveguides may be a viable technology that, in some cases, may supplant heavier multi-pass cells such as White or Herriott cells for performing trace detection using tunable diode laser absorption spectroscopy. We report here a series of experiments for testing the suitability of waveguides for infrared spectroscopy. The loss characteristics of 1 mm bore diameter waveguides have been measured for straight and coiled lengths. Using direct absorption spectroscopy we have found that the absorption pathlength is approximately equal to the physical length of the waveguide. Broadband FM diode laser spectroscopy produces a comparable signal-to-noise ratio with less than a second of signal averaging. Finally, we have also performed near-infrared spectroscopy of nitrous oxide flowing through a waveguide using a telecommunications diode laser.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 946023
- Report Number(s):
- PNNL-SA-36856; 3441; NN2001000
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION SPECTROSCOPY
Environmental Molecular Sciences Laboratory
GLASS
Hollow-glass waveguide
infrared absorption spectroscopy
infrared diode laser
broadband FM spectroscopy
nitric oxide
ethylene.
INFRARED RADIATION
LASER SPECTROSCOPY
NITROUS OXIDE
SIGNAL-TO-NOISE RATIO
WAVEGUIDES