NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Absorption technique for OH measurements and calibrationAn absorption technique is described which utilizes a stabilized frequency-doubled tunable dye laser and a long-path White cell with high mirror reflectivities both in the red and UV. In laboratory conditions it has been possible to routinely obtain a detection sensitivity of 3 parts in 1,000,000 over absorption paths less than 1 m in length and a detection sensitivity of approximately 6 parts in 100,000 over an absorption path of the order of 1 km. The latter number corresponds to 3,000,000 OH molecules/cu cm, and therefore the technique should be particularly useful for calibration the fluorescence instrument for OH measurements. However, the presence of atmospheric fluctuations coupled with intensity variation accompanying frequency scanning appears to degrade the detection sensitivity in outdoor ambient conditions, thus making it unlikely that this technique can be employed for direct OH monitoring.
Document ID
19820058477
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bakalyar, D. M.
(Wayne State University Detroit, MI, United States)
James, J. V.
(Wayne State Univ. Detroit, MI, United States)
Wang, C. C.
(Ford Motor Co. Dearborn, MI, United States)
Date Acquired
August 10, 2013
Publication Date
August 15, 1982
Publication Information
Publication: Applied Optics
Volume: 21
Subject Category
Geophysics
Accession Number
82A42012
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available