skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A dual, parallel cavity Fabry-Perot interferometer

Abstract

Laser Doppler shift velocimetry operating in the fringe mode is widely used to record the velocity history of optically reflective solid objects. When the object is rapidly accelerated, the time resolution of the Fabry-Perot Interferometer (FPI)/streak camera system is frequently inadequate to unambiguously record the data. That is, there is a {open_quotes}dead time{close_quotes} during which fringes form and expand without producing a resolvable record. To remedy this, we have developed a dual, parallel cavity FPI which produces two sets of fringes at the slit of the recording streak camera. The input mirror of the FPI is a conventional flat while the output mirror is stepped so there are two mirror spacings. The input light is divided by the respective areas of the stepped mirror to form two sets of fringes; a higher quality set of fringes {open_quotes}A{close_quotes} is used to determine the velocity history while a second set of fringes {open_quotes}B{close_quotes} is used as a {open_quotes}referee{close_quotes} to determine the number of fringe jumps during the {open_quotes}dead time.{close_quotes} Since the two sets of fringes are necessarily interleaved, there is a possibility of fringe overlap, i.e., fringes of set A can spatially overlap fringes of set B. To date, two dual cavitymore » FPI`s have been successfully constructed and characterized. The theory of operation, details of construction, and the results are described.« less

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
57259
Report Number(s):
UCRL-JC-116856; CONF-9408148-2
ON: DE95010796; TRN: 95:004185
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 21. international congress on high speed photography and photonics, Taejon (Korea, Republic of), 29 Aug - 2 Sep 1994; Other Information: PBD: Aug 1994
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 66 PHYSICS; FABRY-PEROT INTERFEROMETER; TECHNOLOGY ASSESSMENT; DESIGN; VELOCIMETERS; LASER DOPPLER ANEMOMETERS

Citation Formats

Steinmetz, L L, Goosman, D R, and Avara, G R. A dual, parallel cavity Fabry-Perot interferometer. United States: N. p., 1994. Web.
Steinmetz, L L, Goosman, D R, & Avara, G R. A dual, parallel cavity Fabry-Perot interferometer. United States.
Steinmetz, L L, Goosman, D R, and Avara, G R. Mon . "A dual, parallel cavity Fabry-Perot interferometer". United States.
@article{osti_57259,
title = {A dual, parallel cavity Fabry-Perot interferometer},
author = {Steinmetz, L L and Goosman, D R and Avara, G R},
abstractNote = {Laser Doppler shift velocimetry operating in the fringe mode is widely used to record the velocity history of optically reflective solid objects. When the object is rapidly accelerated, the time resolution of the Fabry-Perot Interferometer (FPI)/streak camera system is frequently inadequate to unambiguously record the data. That is, there is a {open_quotes}dead time{close_quotes} during which fringes form and expand without producing a resolvable record. To remedy this, we have developed a dual, parallel cavity FPI which produces two sets of fringes at the slit of the recording streak camera. The input mirror of the FPI is a conventional flat while the output mirror is stepped so there are two mirror spacings. The input light is divided by the respective areas of the stepped mirror to form two sets of fringes; a higher quality set of fringes {open_quotes}A{close_quotes} is used to determine the velocity history while a second set of fringes {open_quotes}B{close_quotes} is used as a {open_quotes}referee{close_quotes} to determine the number of fringe jumps during the {open_quotes}dead time.{close_quotes} Since the two sets of fringes are necessarily interleaved, there is a possibility of fringe overlap, i.e., fringes of set A can spatially overlap fringes of set B. To date, two dual cavity FPI`s have been successfully constructed and characterized. The theory of operation, details of construction, and the results are described.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {8}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: