INTEGRATED OPTICAL PROBES
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1 INTEGRATED OPTICAL PROBES Abstract Optical probes used in velocimetry measurements have typically been individual probes that collect data for a single diagnostic at a single point. These probes have been used in diagnostics such as VISAR, PDV, and radiometry, which measure surface velocity, temperature, and other characteristics. When separate probes are used for these measurements, the different diagnostic points measured must be significantly separated. We have developed integrated probes that collect data for multiple optical diagnostics; these probes measure focused points in close proximity. Page 1
2 Contributors National Security Technologies, Inc. Brent C. Frogget Douglas O. DeVore Paul A. Flores Vincent T. Romero David L. Esquibel Los Alamos National Laboratory David B. Holtkamp Michael A. Shinas Page 2
3 Single 5/8-inch-diameter VISAR Probe Side View 15-mm-diameter lenses Collection fiber (300-µm core) Source collimator w/50-µm core transmit fiber ~0.56-mm VISAR spot VISAR probe w/ ES45436 & ES318 irradiance MM MM Total flux E-03 Watts Max irradiance E-01 Watts/CM^2 Min irradiance E+00 Watts/CM^ Page 3
4 Integrated optical probes Multi-fiber VISAR Probe Page 4
5 Combination Pyrometry/VISAR Probe (Armando) 7/8-inch-diameter housing Side View Pyrometry collection fiber 20-mm-diameter lenses 1:1.5 magnification VISAR Collection fiber (300-µm core) ~0.46-mm VISAR spot (at best focus) IR/VISAR probe irradiance Source collimator w/50-µm core VISAR transmit fiber MM MM Total flux E-04 Watts Max irradiance E-01 Watts/CM^2 Min irradiance E-03 Watts/CM^ Page 5 January 16, 2007 BCF
6 Integrated optical probes Barolo PRAD VISAR/PDV Probe 10:33:37 20-mm-diameter lens VISAR collection fiber (200-µm core) 1:1.5 magnification PDV collimator ~0.32-mm VISAR spot VISAR source collimator w/50-µm core transmit fiber IR/VISAR probe irradiance MM VISAR probe MM Barolo PRAD VISAR probe Scale: Page MM Total flux E-04 Watts Max irradiance E-01 Watts/CM^2 Min irradiance E-03 Watts/CM^2 BCF 17-Jan-07
7 16:17:32 Integrated optical probes Thermos VISAR/PDV probes ~10-µm core PDV fibers (red ray traces) Doublet lenses Source collimators w/50-µm core transmit fibers Mirror 100-µm core VISAR collection fibers (green ray traces) Mirror Pellicle Thermos VISAR/PDV probe, vpax. irradiance ~0.10-mm VISAR spots MM Y PDV spots MM Tota l flux E-0 4 Watt s Max irradi ance E-01 Watts/ CM^2 Min irradi ance E+00 Watts/ CM^2 Page Z
8 Thermos Alignment Reticle Image Page 8
9 Ray Trace of Small PDV/Radiometry Probe (two PDV and two Radiometer fibers traced) Fiber bundle 10-mm fl, 6.25-mm-diameter doublets LiF 7-mm thick 2.8 mm (one PDV fiber traced) 7.8 mm focus distance in air for 1550 nm 7.5-mm focus distance in air for 633 nm setup wavelength Page 9
10 Ray Trace of Powder Gun PDV/Radiometry Probe (one PDV and three Radiometer fibers traced) Fiber bundle (angle polished) 21-mm fl, 14-mm-diameter doublets LiF mm thick (one PDV fiber traced) 16.4 mm focus distance in air for 1550 nm 15.8-mm focus distance in air for 633 nm setup wavelength Page 10
11 Fiber Bundle Output Illumination Analysis at PDV Focus PDV/pyro w/ JML DBL13956 doubl irradiance Three PDV spots MM Seven Radiometer spots MM Total flux E-03 Watts Max irradiance E-01 Watts/CM^2 Min irradiance E+00 Watts/CM^ Page 11 PDV image spots ~10-microns diameter
12 Ray Traces of VISAR Probe (center) with Reflectometer Probe (at angle) 50-µm-diameter core launch fiber stopped down to NA 0.05 Reflectometer Probe uses near IR achromats (6-mm diameter, 9-mm fl) Seven 100-µm-diameter core fibers in close pack 30 degree tilt in air (21 degree tilt in LiF) VISAR probe uses (8-mm fl, 6-mm-diameter singlet) 1-mm-diameter core receive fiber LiF mm 2-mm vertical surface movement shown Page 12
13 Summary Integrated Optical Probes (Armando) Pyrometry/VISAR Probe Barolo PRAD VISAR Probe with built-in PDV Probe Thermos VISAR/PDV Probes Small PDV/Radiometry Probes Powder Gun PDV/Radiometry Probes Future VISAR/Reflectometry Probes These probes measure focused target points that are in close proximity. Page 13
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