A Compact Cryogenic Thermal Source for Detector Array Characterization
David T. Chuss, Karwan Rostem, Edward J. Wollack, Leah Berman, Felipe, Colazo, Martin DeGeorge, Kyle Helson, Marco Sagliocca
TL;DR
This paper presents a novel cryogenic thermal source with a pyramidal design, enabling efficient detector array characterization across a broad frequency range, with validated reflectance measurements matching models.
Contribution
It introduces a compact, cryogenically-compatible thermal source with a unique pyramidal structure for detector characterization, fabricated using innovative molding and bonding techniques.
Findings
Reflectance measured from 30-300 GHz matches models
The source is effective for detector array characterization
Fabrication process is precise and reproducible
Abstract
We describe the design, fabrication, and validation of a cryogenically-compatible quasioptical thermal source designed to be used for characterization of detector arrays. The source is constructed using a graphite-loaded epoxy mixture that is molded into a tiled pyramidal structure. The mold is fabricated using a hardened steel template produced via a wire EDM process. The absorptive mixture is bonded to a copper backplate enabling thermalization of the entire structure. The source reflectance is measured from 30-300 GHz and compared to models.
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