New Techniques In Very High Sensitivity Imaging Radiometry And Applications In Thermal Analysis

R. S. Saul; J. M. B. Webber

doi:10.1117/12.940503

11 May 1987 New Techniques In Very High Sensitivity Imaging Radiometry And Applications In Thermal Analysis

R. S. Saul, J. M. B. Webber

Proceedings Volume 0780, Thermosense IX: Thermal Infrared Sensing for Diagnostics and Control; (1987) https://doi.org/10.1117/12.940503
Event: 1987 Technical Symposium Southeast on Optics, Electro-Optics, and Sensors, 1987, Orlando, FL, United States

Abstract

A very high sensitivity scanning radiometer has been developed for remote sensing in the 8-12 μm spectral region. The paper describes this research system which, under computer control, can automatically monitor the thermal emissions from one point or many points within a preselected field of view. The thermal data is displayed either digitally or in the form of graphs or as colour coded thermal maps of the area under inspection. This research instrument offers a highly versatile scanning system combined with a thermal resolution much greater than usually available from current thermographic systems. Furthermore, in addition to point, line and area scans, temperature vs time plots of single points may be produced. Many digitally recorded scans may be stored and quickly recalled for examination. The range of potential uses is wide and it is envisaged that a commercial system based upon this research instrument would be particularly valuable in those applications requiring up to 100x the resolution of typical thermographic systems. The paper reviews the main features of the research system: * high sensitivity detection and processing systems producing temperature resolution better than ±0.002 Kelvin * variable field of view * single point, line scan or area scan operation * display system Objective methods have been developed for analysis of thermal sensing performance. These tests involved the application of specialised thermal test target systems which enable the spatial and noise characteristics of imaging systems to be assessed. The results of preliminary studies using the high sensitivity scanning radiometer are reported; this work includes engineering material studies, thermal detection in electronic components and life-science studies.

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R. S. Saul and J. M. B. Webber "New Techniques In Very High Sensitivity Imaging Radiometry And Applications In Thermal Analysis", Proc. SPIE 0780, Thermosense IX: Thermal Infrared Sensing for Diagnostics and Control, (11 May 1987); https://doi.org/10.1117/12.940503

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KEYWORDS

Radiometry

Calibration

Resistors

Minimum resolvable temperature difference

Thermography

Control systems

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