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Proceedings Paper

A Technique For The Objective Measurement Of MRTD
Author(s): Glenn M. Cuthbertson; Leslie G. Shadrake; Neil J. Short
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Paper Abstract

The minimum resolvable temperature difference of a thermal imager is generally accepted as being the performance parameter most closely related to the imager's performance in the field. It is, however, universally conceded that an objective test technique is urgently required to replace the current subjective method of measurement, thus removing the dependence on trained operators. Simplistically this can, at first sight, be easily achieved via the measurement of the system modulation transfer function, noise power spectrum and signal transfer function. However, the practice of measuring these system parameters is not so straight forward. This paper deals with a practical implementation of such an objective method of testing, based upon a method proposed by the Royal Aircraft Establishment, Farnborough, subsequently developed at GEC Avionics, Basildon. It deals with the mathematical subtleties of applying the required discrete Fourier transforms in software and of integrating waveforms to achieve acceptable signal to noise ratios. The paper also gives examples of the objective results achieved, and a comparison with the corresponding subjective results.

Paper Details

Date Published: 1 May 1986
PDF: 14 pages
Proc. SPIE 0590, Infrared Technology and Applications, (1 May 1986); doi: 10.1117/12.951982
Show Author Affiliations
Glenn M. Cuthbertson, GEC Avionics Limited (England)
Leslie G. Shadrake, GEC Avionics Limited (England)
Neil J. Short, GEC Avionics Limited (England)

Published in SPIE Proceedings Vol. 0590:
Infrared Technology and Applications
Lionel R. Baker; Andre Masson, Editor(s)

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