Development of a Breath Analyzer for O2 and CO2 Measurement

Hsuan-Yu Chen,Chiachung Chen

doi:10.2174/1874120701913010021

Abstract

Background: Breath analysis can be used to screen disease and detect physical conditions. Many research studies have investigated various sensors or techniques that were used to detect gas concentrations and temperature. However, the studies were less concerned about the performance of sensors. Methods: In this study, we developed and tested a portable breath analyzer for exhaled gas measurement. We detected air flow rate, temperature, humidity, CO2 and O2 concentrations. Commercial sensing elements were used to assemble this breath analyzer. All sensors were calibrated to ensure their accuracy. The response times of different sensors were considered. We analyzed breath during three states; 1) seating and resting for 5 min, 2) walking for 5 min and 3) running for 5 min in test participants. Fifteen students 20 to 34 years of age were the test participants. Results: Heat, humidity and CO2 production and O2 consumption were calculated from these measured data and were used to assess the performance of the analyzer. The Respiratory Quotient (RQ) were estimated by the ratio of VCO2 to VO2. The RQ values for resting, walking and running states were 0.899, 0.865 and 0.785, respectively. Walking and running significantly increased the heat and humidity production of the human body, corresponding to the human physiological function. Conclusion: The RQ value is usually in the range of 0.8 to 0.85. The measurement results for our exhaled analyzer were close to this range. From the respiratory quotient values, the performance of this breath analyzer was reasonable.

Highlights

Breath analysis is an in-situ and non-invasive method to observe the human body function [1]
The original data recorded by the data logger at time i was labeled as τi .The typical curve for the quantity of exhaled breath gas of a test participant in the resting state is in Figs. (2 and 3), showing the effect of the response time of sensors on the measurement result
The signals of sensors of the portable breath analyzer we developed can be connected to a data-logger, the delay in response time for different sensors can be considered and the precise timing of signals could be matched

Summary

Introduction

Breath analysis is an in-situ and non-invasive method to observe the human body function [1]. It can be used to screen disease and detect physical conditions. Many devices and techniques have been developed to perform breath analysis [2, 3]. The exhaled breath is nearly saturated (100% relative humidity, RH) and is at a higher temperature than in normal air. Oxygen consumption (VO2) and carbon dioxide production (VCO2) are important variables for analyzing health conditions. The humidifying performance provides information about the physical conditions of the respiratory system. Breath analysis can be used to screen disease and detect physical conditions. Many research studies have investigated various sensors or techniques that were used to detect gas concentrations and temperature. The studies were less concerned about the performance of sensors

Methods

Results

Conclusion