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Developing a robust sensor for infrared imaging bolometers

A new type of large area sensor for infrared imaging bolometers has been developed. It replaces the thin and fragile free-standing metal foils, which typically have been used, with a multi-layer coated sapphire (or diamond) substrate. Sapphire is transparent to mid-infrared wavelengths, is robust ag...

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Published in:	Review of scientific instruments 2024-09, Vol.95 (9)
Main Authors:	Wurden, G. A., Partesotti, G., Reimold, F., Mukai, K., Peterson, B. J., Federici, F.
Format:	Article
Language:	English
Subjects:	Black body radiation Blackbody Bolometers Cameras Decay Electromagnetic radiation detectors Gold coatings Infrared imaging Lasers Metal foils Multilayers OTHER INSTRUMENTATION Robustness Sapphire Sensors Substrates Thermal diffusivity Thermodynamic properties
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container_title	Review of scientific instruments
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creator	Wurden, G. A. Partesotti, G. Reimold, F. Mukai, K. Peterson, B. J. Federici, F.
description	A new type of large area sensor for infrared imaging bolometers has been developed. It replaces the thin and fragile free-standing metal foils, which typically have been used, with a multi-layer coated sapphire (or diamond) substrate. Sapphire is transparent to mid-infrared wavelengths, is robust against transients, and can be thick enough to even be the vacuum window. The primary radiation absorber is still a thin deposited metal layer, but now it is partially insulated from the supporting sapphire substrate by a black (carbon-based) layer, which also acts as a blackbody remitter. Test results indicate 6× more noise equivalent power density (estimated NEPD = 23 W/m2 at 5 ms camera exposure time, foil temperature decay time 60 ms) for a 2 μm gold-coated sapphire disk compared to estimated NEP = 4 W/m2 at 1.8 ms exposure time, with foil decay time 420 ms, for a nominal 2.5 μm thick platinum-free-standing foil.
doi_str_mv	10.1063/5.0219535
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J.</au><au>Federici, F.</au><aucorp>Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)</aucorp><aucorp>Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Developing a robust sensor for infrared imaging bolometers</atitle><jtitle>Review of scientific instruments</jtitle><addtitle>Rev Sci Instrum</addtitle><date>2024-09-01</date><risdate>2024</risdate><volume>95</volume><issue>9</issue><issn>0034-6748</issn><issn>1089-7623</issn><eissn>1089-7623</eissn><coden>RSINAK</coden><abstract>A new type of large area sensor for infrared imaging bolometers has been developed. It replaces the thin and fragile free-standing metal foils, which typically have been used, with a multi-layer coated sapphire (or diamond) substrate. Sapphire is transparent to mid-infrared wavelengths, is robust against transients, and can be thick enough to even be the vacuum window. 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source	American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list); American Institute of Physics
subjects	Black body radiation Blackbody Bolometers Cameras Decay Electromagnetic radiation detectors Gold coatings Infrared imaging Lasers Metal foils Multilayers OTHER INSTRUMENTATION Robustness Sapphire Sensors Substrates Thermal diffusivity Thermodynamic properties
title	Developing a robust sensor for infrared imaging bolometers
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