Abstract
This work presents a double sliding mode control designed for accelerating the measurement of heat fluxes using thermopiles. The slow transient response generated in the thermopile, when it is placed in contact with the surface to be measured, is due to the changes in the temperature distributions that this operation triggers. It is shown that under some conditions the proposed controls keep the temperature distribution of the whole system constant and that changes in the heat flux at the thermopile are almost instantaneously compensated by the controls. One-dimensional simulations and experimental results using a commercial thermopile, showing the goodness of the proposed approach, are presented. A first rigorous analysis of the control using the Sliding Mode Control and Diffusive Representation theories is also made.
Highlights
Measurement of heat fluxes on surfaces using thermopiles is an extended practice for many applications [1,2,3,4,5,6,7]
This paper focuses on improving the measurement time of heat fluxes using thermopiles placed in contact with surfaces
We propose applying a sliding mode control to avoid thermal transients by keeping an almost constant temperature distribution in the thermopile
Summary
Measurement of heat fluxes on surfaces using thermopiles is an extended practice for many applications [1,2,3,4,5,6,7]. When estimating heat fluxes on surfaces by contact, though, these measurements can be slow. The main reason for these slow response times is that the temperature distribution in the complete system can have large stabilization times depending on the associated thermal structure [6]. Algorithms and circuits have been proposed to obtain the response of the sensors without having to wait for their thermal stabilization. In Reference [10] prediction algorithms are proposed using the thermal circuit associated to the structure. It is possible to obtain quantitative results using non-invasive methods, such as optical measurements [12,13]
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