Fiber-Optic Laser Raman Spectroscopy Sensor

摘要

The Defense Programs Plant Directed Research and Development Program sponsored the optimization and interface of a fiber-optic Raman sensor as a complementary technique to mass spectrometry currently used in the Tritium Facility for measuring hydrogen isotopes. This sensor will provide real-time feedback while reducing the sample load for off-line gas analysis by the Tritium Facility mass spectrometers. The compact Raman system incorporates a 488 nanometer laser system, spectrometer and detector along with a 20- foot fiber-optic probe. The analysis of gas mixtures of protium and deuterium at various compositions and total pressures ranging from 11 to 5000 torr showed good signal to noise ratios using very short integration times (15 seconds). The detection limits for protium and deuterium ranged from 0.5%-0.8%. This probe will be demonstrated in-line in the new HT TCAP (hydrogen-tritium thermal cycling absorption process) cold runs.