Optical Diagnostics Thomas Tsang tight environment high radiation area non-serviceable area passive components optics only, no active electronics back.

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Presentation transcript:

Optical Diagnostics Thomas Tsang tight environment high radiation area non-serviceable area passive components optics only, no active electronics back illuminated with a single fiber laser - pulsed laser X transmit image through flexible fiber bundle

Optical Diagnostics Nov, Princeton fiber bundle Test target Field of view lens

old fiber bundle New imaging fiber bundle Core size: 24 µm, Diameter: 1/4” New imaging fiber bundle Core size: 12 µm, diameter: 1/8” Optical Diagnostics Total fiber counts ~50,000 in 3.17 mm diameter Imaging ~243 x 243 fibers on 960 x 960 CCD array ~1 imaging fiber on ~4x4 pixels on full frame ~1 imaging fiber on ~1 pixel on a single frame SMD camera CCD size:13.4 x 13.4 mm Pixels:960x960 Single frame: 240x240 pixels Reduced pixel size: 56 x 56 um More imaging fibers

Optical Diagnostics Simple back illumination ?

Optical Diagnostics test target laser light input Backlight illumination results fiber backlight need >500 pulse/frame ~mJ/pulse in 1-MHz reprate !! cm scale

Optical Diagnostics >12-inch away Conventional shadow illumination approach ? Can NOT be implemented in this tight environment !

Optical Diagnostics test target retroreflected illumination Spherical mirror laser illumination image collection Works OK in this tight environment cm scale

Optical Diagnostics test target Exp test setup Optical Components 50/50 beam splitter: Edmund, 0.5 cm cube spherical mirror: Edmund, f=3-in, D=3in< Au coated small prism mirror: Edmund, 1x1x1.4 cm, Au coated large prism mirror: Edmund, 2.5x2.5x3.54 cm. Au coated imaging fiber Edmund: ⅛-in diameter, 12-µm core, 0.55 NA illumination fiber: ThorLabs, 0.22 NA, SMA µm core imaging lens: Sunex, f=0.38-cm, f/# 2.6, diagonal FOV 54°, φ1.4-cm x 2.0 cm

Optical Diagnostics Field of view - imaging

Optical Diagnostics Field of view – NIR laser illumination & imaging

Optical Diagnostics optical design in secondary containment One set of optics per viewport e-Drawing - Van Graves, ORNL

Optical Diagnostics An optical chopper in 4 kHz Stationary image 100 µs/frame 10 µs/frame ~40 meter/sec

Optical Diagnostics Other issues: 1.Laser power increase to ~40 W/pulse (instead of 10 Watt/pulse) 2.~50-m long flexible, square shaped imaging fiber – Schott 3.Depth of focus → apparent image size variation 4.3-in dia. spherical mirror (lens/mirror) with the right focal length 5.Anti-reflection coated 800 nm) viewports 6.Number of viewports ? 7.Location of the viewports ? 8.How many fast CCD camera ? 9.Switch from one viewport to the next with one laser/camera system ? 10.Glass rather than fused silica optics ok ? 11. …