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Proceedings Paper

Stabilization of the output signal of thermopile sensors in the thermal environment of automotive applications
Author(s): Martin Liess; Alain Charlebois; Martin Hausner; Henrik Ernst; Hermann Karagözoglu; Jürgen Schilz
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Paper Abstract

Thermopile pyrometer modules are the state of the art for contactless temperature measurements in automotive applications. In such an application, the thermopile has to operate precisely in a challenging thermal environment. While the compensation of the steady state ambient temperature is a well known technique when using thermopiles for temperature measurments, transient thermal effects are still an issue. The change of the ambient temperature as well as temperature flow through the sensor can lead to substantial errors due to unwanted thermal gradients within the device. In the thermopile chip they lead to an error signal since the measurement principle is based on quantifying thermal gradients of the chip that result from the detected IR-radiation. Thermal gradients in the cap and between the cap and the thermopile chip will lead to an exchange of heat radiation between the thermopile chip and the cap, which also leads to measurement errors. Different methods were developed that separately or in combination allow for a significant improvement of the accuracy and signal stability. The methods are based on the reduction of thermal gradients within the thermopile chip and the entire sensor device (isothermal, high thermal mass cap), reduction of radiation exchange between the sensor chip and the housing (low emissive inner cap surface) and prediction and software compensation of the error signal.

Paper Details

Date Published: 10 October 2006
PDF: 9 pages
Proc. SPIE 6379, Photonic Applications for Aerospace, Transportation, and Harsh Environments, 63790K (10 October 2006); doi: 10.1117/12.686875
Show Author Affiliations
Martin Liess, PerkinElmer Optoelectronics (Germany)
Alain Charlebois, PerkinElmer Optoelectronics (Canada)
Martin Hausner, PerkinElmer Optoelectronics (Germany)
Henrik Ernst, PerkinElmer Optoelectronics (Germany)
Hermann Karagözoglu, PerkinElmer Optoelectronics (Germany)
Jürgen Schilz, PerkinElmer Optoelectronics (Germany)

Published in SPIE Proceedings Vol. 6379:
Photonic Applications for Aerospace, Transportation, and Harsh Environments
Christopher S. Baldwin; Anbo Wang; Alex A. Kazemi, Editor(s)

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