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Title: Multipoint photonic doppler velocimetry using optical lens elements

A probe including a fisheye lens is disclosed to measure the velocity distribution of a moving surface along many lines of sight. Laser light, directed to the surface and then reflected back from the surface, is Doppler shifted by the moving surface, collected into fisheye lens, and then directed to detection equipment through optic fibers. The received light is mixed with reference laser light and using photonic Doppler velocimetry, a continuous time record of the surface movement is obtained. An array of single-mode optical fibers provides an optic signal to an index-matching lens and eventually to a fisheye lens. The fiber array flat polished and coupled to the index-matching lens using index-matching gel. Numerous fibers in a fiber array project numerous rays through the fisheye lens which in turn project many measurement points at numerous different locations to establish surface coverage over a hemispherical shape with very little crosstalk.
Authors:
;
Publication Date:
OSTI Identifier:
1130049
Report Number(s):
8,711,336
13/666,953
DOE Contract Number:
AC52-06NA25946
Resource Type:
Patent
Resource Relation:
Patent File Date: 2012 Nov 01
Research Org:
National Security Technologies, LLC, Las Vegas, NV (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION