NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Two-photon laser-induced fluorescence detection of OHThe TP-LIF OH sensor is based on the principle that a molecule having multiple energy states, all of which are bonding, can be pumped into the highest state with the resulting fluorescence being blue-shifted relative to all pumping wavelengths. In this way, one can successfully discriminate against virtually all noise sources in the system using long wavelength blocking filters in conjunction with solar-blind photomultiplier tubes. Thus, these systems tend to be signal limited rather than signal-to-noise limited as is true of the SP-LIF technique as well as other conventional analytical methods. The trick to achieving the above sampling scheme, with high efficiency, is in the use of high photon fluxes of short time duration. Obviously, the latter type of light source is fulfilled nicely by available pulsed lasers. From an operational point of view, however, this laser source needs to be tunable. The latter characteristic permits extremely high selectivity for the detection of a diatomic or simple polyatomic molecule by taking advantage of the high-resolution spectroscopic features of these type species.
Document ID
19870006100
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Davis, D. D. (Georgia Inst. of Tech. Atlanta, GA, United States)
Bradshaw, J. D. (Georgia Inst. of Tech. Atlanta, GA, United States)
Rodgers, M. O. (Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
September 5, 2013
Publication Date
December 1, 1986
Publication Information
Publication: NASA. Langley Research Center Future Directions for H sub x O sub y Detection
Subject Category
Geophysics
Accession Number
87N15533
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available