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Proceedings Paper

1-cm collimated source for use in infrared calibrations
Author(s): Beverly J. Klemme; Timothy M. Jung; Adriaan C. Carter; Eric L. Shirley; Steven R. Lorentz; Raju V. Datla
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Paper Abstract

Collimated infrared sources covering the 2 micrometer to 30 micrometer range of wavelengths are necessary to simulate infrared radiation from distant objects. This is important because on-orbit servo and tracking systems make extensive use of infrared radiation for remote sensing. Collimators are used to calibrate infrared detectors in terms of absolute power within a given spectral range. The National Institute of Standards and Technology (NIST) operates and maintains the Low Background Infrared Calibration (LBIR) facility, which uses a 2 K electrical substitution radiometer, the Absolute Cryogenic Radiometer (ACR), that is the primary national standard for broadband and infrared spectral measurements. At this facility, users can calibrate blackbody sources with at most 1% uncertainty. However, users must then rely on optical systems at their own facility to collimate the radiation from the blackbody. The effect of the optics on the output of the beam must then be calculated from models. For this reason, NIST is developing a portable transfer radiometer (BXR) that can be taken onsite to directly measure the spectral output, thus eliminating intermediate steps in the calibration chain. NIST is also developing a source having 1 cm diameter collimated beam, for a preliminary calibration of the BXR at the LBIR facility from 2 micrometer to 8 micrometer. The source must fit into a volume of about 0.03 m3 (1 cubic foot), have an angular divergence of less than 700 (mu) rad, a power output greater than 10 nW, and demonstrate 1% repeatability or better. The development and characterization of this source is the main topic of this paper.

Paper Details

Date Published: 17 July 2000
PDF: 9 pages
Proc. SPIE 4028, Infrared Detectors and Focal Plane Arrays VI, (17 July 2000); doi: 10.1117/12.391756
Show Author Affiliations
Beverly J. Klemme, National Institute of Standards and Technology (United States)
Timothy M. Jung, National Institute of Standards and Technology (United States)
Adriaan C. Carter, National Institute of Standards and Technology (United States)
Eric L. Shirley, National Institute of Standards and Technology (United States)
Steven R. Lorentz, National Institute of Standards and Technology (United States)
Raju V. Datla, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 4028:
Infrared Detectors and Focal Plane Arrays VI
Eustace L. Dereniak; Robert E. Sampson, Editor(s)

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