Oxygen detection using the laser diode absorption techniqueAccurate measurement of the concentration and flow rate of gaseous oxygen is becoming of greater importance. The detection technique presented is based on the principal of light absorption by the Oxygen A-Band. Oxygen molecules have characteristics which attenuate radiation in the 759-770 nm wavelength range. With an ability to measure changes in the relative light transmission to less than 0.01 percent, a sensitive optical gas detection system was configured. This system is smaller in size and light in weight, has low energy requirements and has a rapid response time. In this research program, the application of temperature tuning laser diodes and their ability to be wavelength shifted to a selected absorption spectral peak has allowed concentrations as low as 1300 ppm to be detected.
Document ID
19910059654
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Disimile, P. J. (Cincinnati Univ. OH, United States)
Fox, C. W. (NASA Health Monitoring Center for Space Propulsion Systems; Cincinnati, University OH, United States)