Author Institution: Los Alamos National LaboratoryAuthor Institution: National Security Technologies, LLCSlides presented at the 2nd Annual Photonic Doppler Velocimetry (PDV) Workshop held at Lawrence Livermore National Laboratory, Livermore, California, August 16-17, 2007

DeVore, Douglas O.

Gallegos, Cenobio H.

Holtkamp, David B.

Iverson, Adam J.

Marshall, Bruce

Teel, Matthew G.

Tunnell, Thomas W.

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Page 1Triature Doppler Velocimeter (TDV)Triature Doppler Velocimeter(TDV)Cenobio Gallegos, Adam Iverson, Tom Tunnell, Matthew Teel,Douglas O. DeVore, and Bruce MarshallNSTecDavid Holtkamp, LANLPDV WorkshopAugust 2007Page 2Triature Doppler Velocimeter (TDV) Page 3Triature Doppler Velocimeter (TDV)• What is the Triature DopplerVelocimeter (TDV)?• How does it work?• Why use a TDV?Page 4Triature Doppler Velocimeter (TDV)TDV• TDV is a Photon Doppler Velocimeter (PDV) with three identicaloutputs that are separated in phase by 120°.• The phase shift is accomplished by using a 3 x 3 single modesplitter. The fusing process in the construction of the 3 x 3splitter has the inherent property  of the output fiber signals to be120°out of phase from each other.• By applying the quadrature concept, improved temporalresolution is obtained where a single PDV channel suffers,due to the inherent limitations of the sliding Fast FourierTransform (FFT) analysis.• Optical down conversion can also be implemented to increasethe ability to measure hundreds of kilometers per second.Page 5Triature Doppler Velocimeter (TDV)TriatureSystemDiagramPage 6Triature Doppler Velocimeter (TDV)Triature LayoutPage 7Triature Doppler Velocimeter (TDV)Calibration• Triature was calibrated with an AGILENT 1550-nmlaser and an AGILENT tunable 1550nm laser.• The tunable laser simulated the Doppler shifted lightfrom 1550 nm to 1449.5 nm at a 0.01-nm step.• Tom Tunnell used this calibration data to developthe TRIATURE analysis software, Adaptive DownConversion (ADC).• A 45-picosecond pulse onto a Mach-Zehnderinterferometer was applied to the Triature.Page 8Triature Doppler Velocimeter (TDV)LaboratorySetupforPicosecondPulse TestandLaser-inducedShockPicosecond Pulser IPG 2W LaserTunable and 1550nm lasersMach ZehnderTRIATUREPOSITIVE LIGHTDOUBLE YAG3mJ LASERTektronics DPO 72004 Digital ‘O’ScopePage 9Triature Doppler Velocimeter (TDV)Page 10Triature Doppler Velocimeter (TDV)Picosecond Pulser45-ps rise time68 ps FWHMPulse out of a Mach-Zehnder interferometer41-ps rise time60 ps FWHMPulse out of the TDV41- ps rise & 68 ps FWHM39- ps rise & 66 ps FWHM43- ps rise & 68 ps FWHMPage 11Triature Doppler Velocimeter (TDV)Laser-induced Shock• A 3-mJ Positive Light laser with 190-ps risetime and 400-ps FWHM pulse at 532 nm• Target: 10-micron-thick copper layered on aglass plate• Probe: single-mode fiber aligned to a lens witha focal point of 48 mm• Triature light source: IPG 1550-nm, 2-W laserPage 12Triature Doppler Velocimeter (TDV)Positive Light LaserPulse: 190-ps rise time and 400-ps FWHM at 532 nmPOSITIVE LIGHTDOUBLE YAG3 mJ LASERPage 13Triature Doppler Velocimeter (TDV)Laser LightFocusingLens10-micron Copperon GlassTargetFocusingProbePage 14Triature Doppler Velocimeter (TDV)Triature Data from Shock SourcePage 15Triature Doppler Velocimeter (TDV)FFT of eachtriature channel1 km/sec1 km/sec1 km/secPage 16Triature Doppler Velocimeter (TDV)Page 17Triature Doppler Velocimeter (TDV)Conclusion• Triature works• Analysis software is being developed• A comparison of TDV with fast VISAR at highervelocities needs to be done• Optical down conversion needs to be tested

Triature Doppler Velocimeter

https://kb.osu.edu/bitstream/1811/52678/1/PDV_2007_Gallegos_Triature.pdf

Triature Doppler Velocimeter

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