A New Pulse Delta-Sigma CO2 NDIR Gas De-tector

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Important Dates

Conference:

Aug. 18-20, 2018

Full Paper Due: Jul. 20, 2018

Abstract Due: Jul. 20, 2018

Audience Registration Due:
Aug. 18, 2018

Presentations of The Int'l Symposium on Photonics and Optoelectronics (SOPO 2016)

● A New Pulse Delta-Sigma CO2 NDIR Gas De-tector
Author(s)
Chih-Hsiung Shen
Affiliation(s)
National Changhua University of Education
KEYWORDS
Delta-Sigma CO2 NDIR, Gas De-tector
ABSTRACT
This work describes the implementation and the modeling of a gas sensor with pulse delta-sigma architecture. Beyond the conventional technique of constant periodic heating of light source, our proposed delta-sigma architecture with closed-loop feedback system is obtained by the hybrid combination of a CO2 infrared sensor prototype which includes an amplifier, ARM based MPU and discrete electronic devices. After a modeling of system, we built a model for the description of re-lationship between gas concentration and sensor by the duty of heating. The measurement results show a good linear behavior of signal and prove to be practical for all the NDIR measuring tech-niques and this work also gives a new approach not only to measure gas concentration fast but also obtain the high resolution.