A Self-Calibrated Gas Sensing System for Breath Analysis

A self-calibrated gas sensing system for breath analysis is introduced. The system is composed of an array of high sensitivity gas sensor combined with temperature, humidity and flow sensor for calibration. The system is able to diagnose common diseases and help people stop them at early stages. 1. Introduction Breath analysis is a new method for point-of-care health monitoring and diagnosis. Compared to traditional diagnostic techniques like blood test, urine test, biopsy, endoscopy and imaging, it has at least two advantages: complete non-invasiveness and limitless repeatability. Exhaled breath contains thousands of volatile compounds that can serve as biomarkers of metabolism processes [1]. By analyzing the pattern of the exhaled compounds, various diseases, including airway inflammation, renal failure and lung cancer, can be detected at early stages [1]. Gas chromatography (GC), mass spectrometry (MS) or the combination of the two (GC-MS) are the most frequently adopted methods in breath analysis give...