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1-cm Collimated Source for Use in Infrared Calibrations



Beverly Klemme, Timothy M. Jung, Adriaan C. Carter, Eric L. Shirley, Steven R. Lorentz, Raju V. Datla


A 1 cm collimated source has been developed and tested for calibration of detectors in the 2 m to 8 m range. This source will be used to calibrate the Transfer Radiometer (BXR) currently under development at NIST. Also, the results of the test of this prototype source are currently being used to provide design parameters to assist in the future development of a 10 cm collimated source. Once calibrated, the BXR will be a reliable transfer standard for on-site calibration of user facilities that utilize collimated sources, The 1 cm source that we designed and tested at NIST used a low-mass tungsten filament source with a surface plasma treatment to maximize in-band radiation. The radiation from this IR source was collimated using a parabolic mirror with a measured angular divergence of <700 rad. A Si photodiode that monitored the source power is used for internal feedback using a PID controller to maximize stability and counteract drift. The absolute cryogenic radiometer installed in the broadband chamber at NIST provides an absolute measure of the power radiated from the source for a given source operating power. The initial test of the 1-cm collimated source measured the emitted power to within 0.5 nW.
Proceedings Title
Infrared Detectors and Focal Plane Arrays, Conference | 6th | Infrared Detectors and Focal Plane Arrays VI | SPIE
Conference Dates
April 25-27, 2000
Conference Location
Conference Title
Proceedings of SPIE--the International Society for Optical Engineering


calibration, collimators, infrared


Klemme, B. , Jung, T. , Carter, A. , Shirley, E. , Lorentz, S. and Datla, R. (2000), 1-cm Collimated Source for Use in Infrared Calibrations, Infrared Detectors and Focal Plane Arrays, Conference | 6th | Infrared Detectors and Focal Plane Arrays VI | SPIE, Undefined (Accessed May 26, 2024)


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Created June 30, 2000, Updated October 12, 2021