A dual-band adaptor for infrared imaging

A. G. McLean; J. W. Ahn; R. Maingi; T. K. Gray; A. L. Roquemore

doi:10.1063/1.4717672

A dual-band adaptor for infrared imaging

A. G. McLean, J. W. Ahn, R. Maingi, T. K. Gray, A. L. Roquemore

Power Exhaust and Particle Control

Research output: Contribution to journal › Review article › peer-review

28 Scopus citations

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 μm wavelengths and transmits 7-10 μm wavelength radiation, each with >95 efficiency and projects each IR channel image side-by-side on the cameras 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.

Original language	English
Article number	053706
Journal	Review of Scientific Instruments
Volume	83
Issue number	5
DOIs	https://doi.org/10.1063/1.4717672
State	Published - May 2012

Funding

This work was supported by the U.S. Department of Energy (DOE) (Contract Nos. DE-AC05-00OR22725 and DE-AC02-09CH11466). The authors would also like to thank Jeremy Graham and Martyn Reynolds of CAIRN Research, and Gary Herrit of II-VI Infrared for their advice and design expertise. Finally, the authors would like to extend individual thanks to Scott Gifford, Tom Holoman, Ron Jakober, and the rest of the Princeton Plasma Physics Laboratory team for their technical assistance and effort.

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725, DE-AC02-09CH11466

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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A dual-band adaptor for infrared imaging

Abstract

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