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Title: A dual-band adaptor for infrared imaging

Abstract

A novel imaging adaptor providing the capability to extend a standard single-band infrared (IR) camera into a two-color or dual-band device has been developed for application to high-speed IR thermography on the National Spherical Tokamak Experiment (NSTX). Temperature measurement with two-band infrared imaging has the advantage of being mostly independent of surface emissivity, which may vary significantly in the liquid lithium divertor installed on NSTX as compared to that of an all-carbon first wall. In order to take advantage of the high-speed capability of the existing IR camera at NSTX (1.6-6.2 kHz frame rate), a commercial visible-range optical splitter was extensively modified to operate in the medium wavelength and long wavelength IR. This two-band IR adapter utilizes a dichroic beamsplitter, which reflects 4-6 {mu}m wavelengths and transmits 7-10 {mu}m wavelength radiation, each with >95% efficiency and projects each IR channel image side-by-side on the camera's detector. Cutoff filters are used in each IR channel, and ZnSe imaging optics and mirrors optimized for broadband IR use are incorporated into the design. In-situ and ex-situ temperature calibration and preliminary data of the NSTX divertor during plasma discharges are presented, with contrasting results for dual-band vs. single-band IR operation.

Authors:
; ; ;  [1];  [2]
  1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
  2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
Publication Date:
OSTI Identifier:
22072305
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 83; Journal Issue: 5; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CALIBRATION; CAMERAS; CARBON; COLOR; DIVERTORS; EMISSIVITY; FIRST WALL; IMAGES; INFRARED THERMOGRAPHY; KHZ RANGE; LITHIUM; MIRRORS; NSTX DEVICE; OPTICAL FILTERS; PLASMA; TEMPERATURE MEASUREMENT; WAVELENGTHS; ZINC SELENIDES

Citation Formats

McLean, A G, Ahn, J-W, Maingi, R, Gray, T K, and Roquemore, A L. A dual-band adaptor for infrared imaging. United States: N. p., 2012. Web. doi:10.1063/1.4717672.
McLean, A G, Ahn, J-W, Maingi, R, Gray, T K, & Roquemore, A L. A dual-band adaptor for infrared imaging. United States. https://doi.org/10.1063/1.4717672
McLean, A G, Ahn, J-W, Maingi, R, Gray, T K, and Roquemore, A L. 2012. "A dual-band adaptor for infrared imaging". United States. https://doi.org/10.1063/1.4717672.
@article{osti_22072305,
title = {A dual-band adaptor for infrared imaging},
author = {McLean, A G and Ahn, J-W and Maingi, R and Gray, T K and Roquemore, A L},
abstractNote = {A novel imaging adaptor providing the capability to extend a standard single-band infrared (IR) camera into a two-color or dual-band device has been developed for application to high-speed IR thermography on the National Spherical Tokamak Experiment (NSTX). Temperature measurement with two-band infrared imaging has the advantage of being mostly independent of surface emissivity, which may vary significantly in the liquid lithium divertor installed on NSTX as compared to that of an all-carbon first wall. In order to take advantage of the high-speed capability of the existing IR camera at NSTX (1.6-6.2 kHz frame rate), a commercial visible-range optical splitter was extensively modified to operate in the medium wavelength and long wavelength IR. This two-band IR adapter utilizes a dichroic beamsplitter, which reflects 4-6 {mu}m wavelengths and transmits 7-10 {mu}m wavelength radiation, each with >95% efficiency and projects each IR channel image side-by-side on the camera's detector. Cutoff filters are used in each IR channel, and ZnSe imaging optics and mirrors optimized for broadband IR use are incorporated into the design. In-situ and ex-situ temperature calibration and preliminary data of the NSTX divertor during plasma discharges are presented, with contrasting results for dual-band vs. single-band IR operation.},
doi = {10.1063/1.4717672},
url = {https://www.osti.gov/biblio/22072305}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 5,
volume = 83,
place = {United States},
year = {2012},
month = {5}
}