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A tunable line filter polychromator for gas temperature measurements using laser Raman scatteringA proprietary laser line filter spectrograph (LLFS) was modified to test for improved remote measurement of atmospheric temperature by Raman spectroscopy of the rotational bands of N2 and O2. Both grating scan measurements with fixed PMT and polychromator image plane PMT scans with fixed grating setting were made using HeNe and Ar(+) lasers. The LLFS was found to have a laser line rejection ratio at 6A from the laser line and provides resolved rotational Raman spectral display at the polychromator exit plane. Spectral resolution is adequate to measure and correct for background in the Stokes spectrum. It is anticipated that this system should allow measurement of gas or atmospheric temperature to + or - 1 C.
Document ID
19750011585
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Grossman, J. J.
(McDonnell-Douglas Astronautics Co. Huntington Beach, CA, United States)
Muramoto, M.
(McDonnell-Douglas Astronautics Co. Huntington Beach, CA, United States)
Date Acquired
September 3, 2013
Publication Date
March 1, 1975
Subject Category
Lasers And Masers
Report/Patent Number
MDC-G5764
NASA-CR-134771
Accession Number
75N19657
Funding Number(s)
CONTRACT_GRANT: NAS3-17818
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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