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Title: A Fisheye Lens as a Photonic Doppler Velocimetry Probe

Abstract

A new fisheye lens design is used as a miniature probe to measure the velocity distribution of an imploding surface along many lines of sight. Laser light, directed and scattered back along each beam on the surface, is Doppler shifted by the moving surface and collected into the launching fiber. The received light is mixed with reference laser light in each optical fiber in a technique called photonic Doppler velocimetry, providing a continuous time record. An array of single-mode optical fibers sends laser light through the fisheye lens. The lens consists of an index-matching positive element, two positive doublet groups, and two negative singlet elements. The optical design minimizes beam diameters, physical size, and back reflections for excellent signal collection. The fiber array projected through the fisheye lens provides many measurement points of surface coverage over a hemisphere with very little crosstalk. The probe measures surface movement with only a small encroachment into the center of the cavity. The fiber array is coupled to the index-matching element using index-matching gel. The array is bonded and sealed into a blast tube for ease of assembly and focusing. This configuration also allows the fiber array to be flat polished at a commonmore » object plane. In areas where increased measurement point density is desired, the fibers can be close packed. To further increase surface density coverage, smaller-diameter cladding optical fibers may be used.« less

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Nevada Test Site (NTS), Mercury, NV (United States)
Sponsoring Org.:
USDOE NA Office of Defense Programs (NA-10)
OSTI Identifier:
1057201
Report Number(s):
DOE/NV/25946-1532; LA-UR 12-22911
DOE Contract Number:  
DE-AC52-06NA25946
Resource Type:
Conference
Journal Name:
Proc. SPIE 8494, Interferometry XVI: Applications, 84940D
Additional Journal Information:
Journal Volume: 8494; Conference: SPIE Optics + Photonics Conference; August 12-16, 2012; San Diego, CA
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Photonic Doppler Velocimetry, PDV, fisheye lens, single-mode fiber

Citation Formats

Frogget, B C, Cox, B C, DeVore, D O, Esquibel, D L, Frayer, D K, Furlanetto, M R, Holtkamp, D B, Kaufman, M I, Malone, R M, and Romero, V T. A Fisheye Lens as a Photonic Doppler Velocimetry Probe. United States: N. p., 2012. Web. doi:10.1117/12.930195.
Frogget, B C, Cox, B C, DeVore, D O, Esquibel, D L, Frayer, D K, Furlanetto, M R, Holtkamp, D B, Kaufman, M I, Malone, R M, & Romero, V T. A Fisheye Lens as a Photonic Doppler Velocimetry Probe. United States. https://doi.org/10.1117/12.930195
Frogget, B C, Cox, B C, DeVore, D O, Esquibel, D L, Frayer, D K, Furlanetto, M R, Holtkamp, D B, Kaufman, M I, Malone, R M, and Romero, V T. 2012. "A Fisheye Lens as a Photonic Doppler Velocimetry Probe". United States. https://doi.org/10.1117/12.930195.
@article{osti_1057201,
title = {A Fisheye Lens as a Photonic Doppler Velocimetry Probe},
author = {Frogget, B C and Cox, B C and DeVore, D O and Esquibel, D L and Frayer, D K and Furlanetto, M R and Holtkamp, D B and Kaufman, M I and Malone, R M and Romero, V T},
abstractNote = {A new fisheye lens design is used as a miniature probe to measure the velocity distribution of an imploding surface along many lines of sight. Laser light, directed and scattered back along each beam on the surface, is Doppler shifted by the moving surface and collected into the launching fiber. The received light is mixed with reference laser light in each optical fiber in a technique called photonic Doppler velocimetry, providing a continuous time record. An array of single-mode optical fibers sends laser light through the fisheye lens. The lens consists of an index-matching positive element, two positive doublet groups, and two negative singlet elements. The optical design minimizes beam diameters, physical size, and back reflections for excellent signal collection. The fiber array projected through the fisheye lens provides many measurement points of surface coverage over a hemisphere with very little crosstalk. The probe measures surface movement with only a small encroachment into the center of the cavity. The fiber array is coupled to the index-matching element using index-matching gel. The array is bonded and sealed into a blast tube for ease of assembly and focusing. This configuration also allows the fiber array to be flat polished at a common object plane. In areas where increased measurement point density is desired, the fibers can be close packed. To further increase surface density coverage, smaller-diameter cladding optical fibers may be used.},
doi = {10.1117/12.930195},
url = {https://www.osti.gov/biblio/1057201}, journal = {Proc. SPIE 8494, Interferometry XVI: Applications, 84940D},
number = ,
volume = 8494,
place = {United States},
year = {Sat Sep 01 00:00:00 EDT 2012},
month = {Sat Sep 01 00:00:00 EDT 2012}
}

Conference:
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