Dr. David R. Goosman Profile

Dr. David R. Goosman

Physicist at LLNL

SPIE Involvement:

Author

Publications (8)

Proceedings Article | 17 March 2005 Paper

Velocimetry using heterodyne techniques

Oliver Strand, Leon Berzins, David Goosman, William Kuhlow, Paul Sargis, Tony Whitworth

Proceedings Volume 5580, (2005) https://doi.org/10.1117/12.567579

KEYWORDS: Heterodyning, Sensors, Fourier transforms, Fiber lasers, Doppler effect, Velocimetry, Diagnostics, Single mode fibers, Telecommunications, Picosecond phenomena

Read Abstract +

Proceedings Article | 17 March 2005 Paper

Optical probes for continuous Fabry-Perot velocimetry inside materials

David Goosman, James Wade, Raul Garza, George Avara, Thomas Crabtree, Anthony Rivera, David Hare, Danny Tolar, Bradford Bratton

Proceedings Volume 5580, (2005) https://doi.org/10.1117/12.566589

KEYWORDS: Aluminum, Explosives, Optical fibers, Velocimetry, Liquids, Fabry–Perot interferometers, Cladding, Metals, Velocity measurements, Silica

Read Abstract +

We have used velocimetry for many years at LLNL to measure velocity-time histories of surfaces in dynamic experiments. We have developed and now use special instrumentation to make continuous shock-velocity measurements inside of materials. The goal is to extend the field of velocimetry into a new field of application in shock physics. At the last Congress we reported the successful use of our new filter system for selectively eliminating most of the non-Doppler-shifted light. We showed one record of a fiber embedded inside an explosive making a continuous detonation velocity-time history. At that time it was difficult to obtain complete records. We have now carried out over 50 inexpensive experiments usually using small cylinders or rectangular blocks of explosives or metals. Most were started by detonating a 25 mm diam. by 25 mm long cylinder of Comp B explosive to drive a shock into an adjacent material of similar dimensions, using our embedded fiber probes. In contrast to surface velocimetry, embedded measurements involve detailed hydrodynamic considerations in order to result in a successful record. Calculations have guided us in understanding of various failed and successful experiments. The homogeneity of the explosive, poor contact, the materials used in the cladding and core of the fiber optic probes, and the shock speeds to be covered all greatly affect the success of an experiment. For example, a poor contact between the optical fiber and its environment causes severe loss of data. Non-symmetric air gaps on one side of the fiber cause 3 dimensional hydrodynamic effects, which cause the shock wave in the fiber core to be too steeply angled to reflect light. We have recently developed and successfully used a special probe to usually overcome this limitation. We have custom designed several unique types of fiber-optic probes for specialty applications, using both solid and liquid core materials, to extend the usable shock-velocity range.

Proceedings Article | 1 August 2003 Paper

Optical filters to exclude non-Doppler-shifted light in fast velocimetry

David Goosman, George Avara, James Wade, Anthony Rivera

Proceedings Volume 4948, (2003) https://doi.org/10.1117/12.516818

KEYWORDS: Optical filters, Interfaces, Mirrors, Explosives, Reflectivity, Reflection, Doppler effect, Interferometers, Fabry–Perot interferometers, Velocimetry

Read Abstract +

Proceedings Article | 1 August 2003 Paper

Design and field test of a galvanometer deflected streak camera

Ching Lai, David Goosman, James Wade, George Avara

Proceedings Volume 4948, (2003) https://doi.org/10.1117/12.516886

KEYWORDS: Streak cameras, Cameras, Mirrors, Spatial resolution, Charge-coupled devices, Imaging systems, Signal processing, Image processing, Scanners, CCD image sensors

Read Abstract +

Proceedings Article | 17 April 2001 Paper

Efficient optical probes for fast surface velocimetry: multiple frequency issues for Fabry and VISAR methods

David Goosman, George Avara, Stephen Perry

Proceedings Volume 4183, (2001) https://doi.org/10.1117/12.424305

KEYWORDS: Fiber lasers, Lenses, Lens design, Reflection, Glasses, Velocimetry, Doppler effect, Reflectors, Metals, Spherical lenses

Read Abstract +

We have in the past used several types of optical probe lenses for delivering and collecting laser light to an experiment for laser velocimetry. When the test surface was in focus, however, the collected light would fill mostly the laser fiber rather than the collection fiber(s). We have designed, developed and used for 8 years nested-lens probe assemblies that solve this problem. Our first version used a commercial AR-coated glass achromat, which we cored to remove the inner fourth of its area. The core was then reinserted with its optical center offset from that of annulus by an amount slightly less than the separation between the laser and collector fibers. The laser and collector fibers are placed in contact with each other behind the lens and have NA values of 0.11 and 0.22, respectively. Because most of the collected light now focused on the collection fiber, this system was far superior to the single lens systems, but was laborious. For the last five years we used injection-molded acrylic aspheric nested lenses, which are inexpensive in quantity and require little labor to install into a probe. Only an azimuthal rotation and positioning of the fiber plane are needed to incorporate the plastic lens into a probe. Special ray-trace codes were written and used to design the lens, and many iterations by the molder were required to develop the injection processing parameters to produce a good lens, since it was thick for its diameter. These probes have real light collection efficiencies of 75% of theoretical, work well over a wide range of distances, with collection depths of field matching theory. The lenses can take 100 watts of pulsed power many times without damage, since the lens is designed so that reflections from the lens surface do not focus within the lens. The collection fiber size is designed to work with our manybeam velocimeter facility reported in a previous Congress, where the collection NA times collection fiber size exceeds the acceptance of the velocimeter. The Doppler-shifted light enters the collection fiber with angles between 0.11 and 0.2, with little light in the 0 to 0.11 NA region. However, the manybeam velocimeter uses just the light in the 0 to 0.11 NA range, except when we link two analyzer tables together. A slight amount of mode scrambling of the Doppler shifted light converts the light into a uniformly filled NA equals 0.2 angular range before entering the velocimeter analyzer table. We have expended seven hundred plastic nested lenses in various experiments. The most recent version of the fiber cable assembly will be shown. Six situations will be discussed where multiple reflected frequencies were observed in experiments, illustrating an advantage of the Fabry-Perot vs. the VISAR method.

Proceedings Article | 22 June 1999 Paper

Striped double-cavity Fabry-Perot interferometers using both glass and air

David Goosman, Lloyd Steinmetz, Stephen Perry

Proceedings Volume 3516, (1999) https://doi.org/10.1117/12.350445

KEYWORDS: Glasses, Fabry–Perot interferometers, Solids, Interferometers, Mirrors, Fabry–Perot interferometry, Fringe analysis, Silica, Streak cameras, Spatial resolution

Read Abstract +

Proceedings Article | 28 May 1997 Paper

Many-beam velocimeter for fast surfaces

David Goosman, George Avara, Lloyd Steinmetz, Ching Lai, Stephen Perry

Proceedings Volume 2869, (1997) https://doi.org/10.1117/12.273413

KEYWORDS: Mirrors, Cameras, Streak cameras, Interferometers, Multiplexing, Fiber lasers, CCD cameras, Velocimetry, Glasses, Continuous wave operation

Read Abstract +

Proceedings Article | 30 May 1995 Paper

Dual parallel-cavity Fabry-Perot interferometer

Lloyd Steinmetz, David Goosman, George Avara

Proceedings Volume 2513, (1995) https://doi.org/10.1117/12.209626

KEYWORDS: Mirrors, Streak cameras, Fabry–Perot interferometry, Doppler effect, Fringe analysis, Cameras, Interferometers, Solids, Velocimetry, Adaptive optics

Read Abstract +

Showing 5 of 8 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years