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5 August 2009 REMS GTS: a pyrometer for Mars ground temperature measurement
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This paper proposes a set of mathematical equations for modelling the REMS GTS, a pyrometer dedicated to measure the brightness temperature of the Martian surface. The equations complete a new simplified analytical thermal model based on an energy balance theory, which considers the internal thermopile structure and operation, and the exchanged heat fluxes between detector transducer and the rest of the elements. The main advantage of this model, versus previous ones, is that it includes a direct relation between the sensor physical properties and the parameters of the model. Therefore, it is simple to establish a methodology to calibrate the system after a change or degradation in any part of the sensor. In remote or hostile applications this property is very important and necessary. The model permits to establish a practical method to identify the model constants, and a differential in-flight calibration algorithm to determine and compensate the degradation of the sensor due to the deposition of dust over the thermopile window. The main objective of this paper is to show, by using experimental data, the performance of the proposed model, analyzing its capability to measure the temperature of a target surface. It is also included a practical demonstration of the correct behaviour of the in-flight calibration algorithm.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eduardo Sebastián, Carlos Armiens, and Javier Gómez-Elvira "REMS GTS: a pyrometer for Mars ground temperature measurement", Proc. SPIE 7383, International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Infrared Imaging and Applications, 73832J (5 August 2009);

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