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.
This paper describes the configuration of the observational stations belonging to the RETRO (REd de Telescopios ROboticos) network of robotic telescopes, operated by Centro de Astrobiologia. This network is composed, at the moment, by two 50 cm plus one 40 cm robotic telescopes installed in remote observatories (several hundred km away from each other), that operate autonomously without real-time human supervision.
This project is devoted to the applications of astrometric and photometric astronomical observations with robotic telescopes for systematic research in fields relevant to astrobiology: photometric detection of extrasolar planets, photometric follow-up of solar-type stars, and astrometry of near-Earth objects (NEOs). To this purpose, the telescopes are equipped with CCD cameras for direct imaging, and photometric wide and medium-band filters.
Francisco Meca Meca, Francisco Rodriguez Sanchez, Manuel Mazo Quintas, Juan Garcia Dominguez, Rafael Fonolla Navarro, Eduardo Sebastian Martinez, Jose Jimenez Calvo, Diego Lillo Rodriguez, Miguel Garcia Garrido
Wheels, hubs and brake discs in a train during its circulation are under mechanical strains that make its temperature increase above the environment temperature. Mechanical defects in those elements produce an excessive friction and, as a consequence of it, an important increment of its temperature in relation to normal values. Detecting these anomalies is essential to avoid accidents and it is performed by fixed systems located next to rails which make infrared temperature measurements of hot points and send them to a supervisory station that takes the proper steps. The paper introduces the most important problems which must be dealt with during the designing stage of the measurement system. It also explains the solutions taken by the authors in order to assure the minimum operative aims demanded by the application. These problems includes: the choice of the detector and measurement method, communication with the supervisory station, and the environment conditions. Finally, the research lines followed by the authors in order to improve and extend the system's capabilities are explained.
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