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A balanced wye-to-delta circuit comprises balanced Y-connected voltage sources and delta-connected loads with no neutral line connection.
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Acceleration of the Measurement Time of Thermopiles Using Sigma-Delta Control.

Manuel Domínguez-Pumar1, Eduard Pérez2, Marina Ramón2

  • 1Micro and Nano Technologies Group, Electronic Engineering Department, Universitat Politècnica de Catalunya-BarcelonaTech, 08034 Barcelona, Spain. manuel.dominguez@upc.edu.

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Summary

This study introduces a novel double sliding mode control to speed up heat flux measurements using thermopiles. The advanced control system maintains stable temperature distributions, enabling near-instantaneous heat flux compensation and faster thermal measurements.

Keywords:
heat fluxsigma-deltasliding mode controlthermopile

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Area of Science:

  • Heat Transfer
  • Control Systems Engineering
  • Measurement Science

Background:

  • Thermopile sensors exhibit slow transient responses due to temperature distribution changes during heat flux measurement.
  • Accurate and rapid heat flux measurement is crucial in various thermal engineering applications.
  • Existing methods often struggle with the inherent sluggishness of thermopile sensors.

Purpose of the Study:

  • To develop and validate a double sliding mode control (DSMC) strategy for accelerating thermopile-based heat flux measurements.
  • To investigate the ability of the proposed control to maintain constant temperature distributions within the measurement system.
  • To demonstrate the effectiveness of DSMC in achieving near-instantaneous compensation of heat flux variations.

Main Methods:

  • Implementation of a double sliding mode control algorithm tailored for thermopile systems.
  • Utilizing one-dimensional simulations to model and analyze the control system's performance.
  • Conducting experimental validation using a commercial thermopile sensor.
  • Applying Sliding Mode Control and Diffusive Representation theories for rigorous control analysis.

Main Results:

  • The proposed DSMC effectively maintains constant temperature distributions under specific operating conditions.
  • Changes in heat flux are compensated almost instantaneously by the control system.
  • Simulations and experimental results confirm the significant acceleration of heat flux measurement.
  • The control strategy demonstrates superior performance compared to conventional methods.

Conclusions:

  • The developed double sliding mode control offers a significant advancement in the speed and accuracy of thermopile heat flux measurements.
  • The control's ability to stabilize temperature distributions is key to its rapid response.
  • This approach holds promise for applications requiring high-frequency thermal monitoring.