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New CO/sub 2/ sensor with high resolution and fast response

Research group:


Publication Type:

Conference/Workshop Paper

Venue:

Proceedings of the 23rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2001


Abstract

The most common principles for CO/sub 2/ sensors are only partially fulfilling the requirements of cardiovascular and respiratory applications. A new acoustic sensor principle is claimed to be favorable in several respects, such as size, resolution, response time, reliability and cost. The sensor makes use of an electro acoustic element coupled to a Kundt resonator. The resonance frequency is determined by the mean molecular mass of the gas contained in the resonator, which may, in turn, be dominated by the variations of CO/sub 2/ concentration. A phased locked loop (PLL) oscillator provides both voltage and frequency outputs of the sensor. In this paper, a prototype design is presented, along with experimental results demonstrating that resolution, linearity and response time adequate for biomedical applications may be achieved.

Bibtex

@inproceedings{Hok741,
author = {Bertil H{\"o}k and Mikael Ekstr{\"o}m and Ylva B{\"a}cklund},
title = {New CO/sub 2/ sensor with high resolution and fast response},
editor = {IEEE},
pages = {3100--3103},
month = {October},
year = {2001},
booktitle = {Proceedings of the 23rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2001},
url = {http://www.es.mdh.se/publications/741-}
}