Accessibility navigation

Reversible ageing effects in cryogenically cooled infrared filter radiometers

Theocharous, E., Hawkins, G. and Fox, N. P. (2005) Reversible ageing effects in cryogenically cooled infrared filter radiometers. Infrared Physics & Technology, 46 (4). pp. 339-349. ISSN 1350-4495

Full text not archived in this repository.

It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing.

To link to this item DOI: 10.1016/j.infrared.2004.06.002


In this paper we report the observation of drifts in the responsivity of cryogenically cooled InSb detector-based infrared filter radiometers which have very strong wavelength dependence. These drifts can result in the increase or decrease of the response of the filter radiometers by over 5%. The origin of these variations was investigated and was shown to arise due to a thin film of ice formed on the multi-layer bandpass filter used to define the spectral response of the filter radiometer. The thin layer of ice interacts with the characteristics of the filter (which itself consists of a number of thin layers) and modifies the filter spectral transmission thus modifying the response of the filter radiometer of which the filter is part of. These observations are particularly relevant to space instruments which use infrared filter radiometers for earth observation. Debris from the spacecraft engines is known to accumulate on cold surfaces of instruments carried on board. The deposition of this debris on cold filters can modify the spectral response of the instruments, which use these filters to define a spectral response. Crown Copyright (c) 2004 Published by Elsevier B.V. All rights reserved.

Item Type:Article
Divisions:Science > School of Mathematical, Physical and Computational Sciences > Department of Computer Science
ID Code:15396
Uncontrolled Keywords:infrared, filter radiometer, cryogenically cooled detectors, ageing, ice, space instruments, OPTICAL-PROPERTIES, DETECTORS

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation