AN INHERENTLY LINEAR TRANSDUCER USING THERMAL SIGMA-DELTA MODULATOR

被引：0

作者：

Rosa, Valter C. ^{[1
]}

Oliveira, Amauri ^{[1
]}

Palma, Ligia S. ^{[1
]}

Amaral, Luiz Fernando G. T. ^{[1
]}

机构：

[1] Univ Fed Bahia, Dept Elect Engn, Salvador, BA, Brazil

来源：

XIX IMEKO WORLD CONGRESS: FUNDAMENTAL AND APPLIED METROLOGY, PROCEEDINGS | 2009年

关键词：

sigma-delta modulation; temperature transducer; thermal radiation transducer;

D O I：

暂无

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The aim of this article is to describe a feedback circuit with thermoresistive sensor based on thermal sigma-delta modulator. The circuit uses 1-bit first order sigma-delta modulator in which a considerable part of conversion functions is performed by the sensor. This transducer circuit is able to measure digital physical quantities that interact with the sensor: temperature, thermal radiation and fluid velocity. In this study, it is used to measure environment temperature, on which digital output is linearly dependent. Equations that support circuit behaviour, simulation results and experimental results are shown. Two architectures are presented, one completely analogue and other with some parts digitally implemented using microcontroller. In addition, it is presented a thermal radiation architecture version in which digital output is intrinsically linear to the thermal radiation measure.

引用

页码：1540 / 1545

页数：6

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