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4 September 2018 Raman detection of MNA in solid rocket fuels
Carlton Farley III, Aschalew Kassu, Jonathan Mills, Sandra Sadate-Moualeu, Michael Curley, Paul Ruffin, Anup Sharma, Jeremy Rice, Christopher Marshall
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Proceedings Volume 10755, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XII; 107550U (2018) https://doi.org/10.1117/12.2321356
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States
Abstract
A sensitive Raman spectroscopy technique is used for detection and possible quantification of the propellant stabilizer, nmethyl nitroaniline (MNA), in solid rocket propellants used in multiple domestic missile systems. Over time, the energetic ingredients of the propellant will degrade and react with the stabilizer, causing issues with the propellant useful safe life. Currently, there are no non-destructive analytical techniques for which MNA can be detected in solid rocket fuel inside a missile. Therefore, after a certain amount of time, missiles in inventory must be disassembled and tested for reliability and safety. This methodology is labor intensive, costly, and time consuming so a less intrusive approach is warranted to determine a missile useful safe life. Raman spectroscopy provides a possible solution to this problem, where a small fiber optic probe line may be inserted into the rocket motor of the missiles, which can be tested within seconds without the need for dismantling the missiles. A 785 nm portable Raman analyzer is used for all measurements reported in this paper with integration times ranging from 10 to 60 s. It is found that Raman sensing is a viable option for detection of MNA in solid rocket fuels.
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Carlton Farley III, Aschalew Kassu, Jonathan Mills, Sandra Sadate-Moualeu, Michael Curley, Paul Ruffin, Anup Sharma, Jeremy Rice, and Christopher Marshall "Raman detection of MNA in solid rocket fuels", Proc. SPIE 10755, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XII, 107550U (4 September 2018); https://doi.org/10.1117/12.2321356
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KEYWORDS
Raman spectroscopy
Missiles
Rockets
Solids
Chemical analysis
Nondestructive evaluation
Sensors
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