Optical leak detection of oxygen using IR-laser diodesThe ability to accurately measure the concentration of gaseous oxygen and its corresponding flow rate is becoming of greater importance. The technique being presented is based on the principal of light attenuation due to the absorption of radiation by the A-band of oxygen which is located in the 759-770 nm wavelength range. With an ability to measure the change in the light transmission to 0.05 percent, a sensitive optical leak detection system which has a rapid time response is possible. In this research program, the application of laser diode technology and its ability to be temperature tuned to a selected oxygen absorption spectral peak has allowed oxygen concentrations as low as 16,000 ppm to be detected.
Document ID
19930040186
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Disimile, P. J. (NASA Headquarters Washington, DC United States)
Fox, C. (NASA Headquarters Washington, DC United States)
Toy, N. (Cincinnati Univ.; NASA, Health Monitoring Center for Space Propulsion Systems, OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Earth and atmospheric remote sensing; Proceedings of the Meeting, Orlando, FL, Apr. 2-4, 1991 (A93-24176 08-42)
Publisher: Society of Photo-Optical Instrumentation Engineers