A Novel Modular System for Breath Analysis Using Temperature Modulated MOX Sensors

Abstract

In this work, a new generation of gas sensing systems specially designed for breath analysis is presented. The developed system comprises a compact modular, low volume, temperature-controlled sensing chamber with three compartments that can host different sensor types. In the presented system, one compartment contains an array of 8 analog MOX sensors and the other two 10 digital MOX sensors each. Here, we test the system for the detection of low concentrations of several compounds.

Semiconductor Gas Sensors: Materials, Technology, Design, and Application

“…Semiconducting gas sensors are applied to test some of these gases, such as acetone, hydrogen peroxide, volatile sulfur, nitric oxide, and ammonia [ 191 ]. However, the research is being conducted into constructing eNose systems based on commercial MOX sensors to detect low concentrations of VOCs in breath [ 192 ], further improved by temperature modulation, containing 8 analog and 10 digital commercial MOX sensors [ 193 ].…”

An in-hive soft sensor based on phase space features for <i>Varroa</i> infestation level estimation and treatment need detection

“…With the advent of highly integrated gas sensing systems, such as the Sensirion SGP30 multi-pixel gas sensor system 1 (SENSIRION, 2022) or the BOSCH Sensortec BME680 (Bosch, 2020), the possibility for VILE using an in-hive low-cost gas sensing system and (in)direct indicators from hive air analysis over the bee season was added to our IndusBee4.0 system. Numerous projects exploiting these and other sensor chips have recently been carried out; these studies have predominantly focused on air quality issues (e.g., Arroyo et al, 2020), but breath analysis (Jaeschke et al, 2019) has also been carried out and inspired the use case in this work. The BME680 allows for the control of a sensor hot plate or the heating of the single gas sensor pixel, i.e., it can be modulated for temperature cycles (Lee and Reedy, 1999;Jaeschke et al, 2019) in measurement.…”

“…Numerous projects exploiting these and other sensor chips have recently been carried out; these studies have predominantly focused on air quality issues (e.g., Arroyo et al, 2020), but breath analysis (Jaeschke et al, 2019) has also been carried out and inspired the use case in this work. The BME680 allows for the control of a sensor hot plate or the heating of the single gas sensor pixel, i.e., it can be modulated for temperature cycles (Lee and Reedy, 1999;Jaeschke et al, 2019) in measurement. One significant advantage of a hive-integrated solution is measurement in the stable "bee climate", which avoids numerous issues such as those related to the dew point that have been reported for external measurement setups (Szczurek et al, 2020a;Ba ¸k et al, 2020).…”

Self-Adaptation of Oxygen Adsorption and Sub-Surface Junction Formation in Thin Nanometric Sheets of Metal Oxides

“…Metal oxide (MOX) gas sensors and sensor arrays, i.e., E-Noses [1], are widely employed in the detection of gases and gas concentrations in the ambient air to aid in a multitude of safety, security, medical, automotive and industrial control scenarios [2][3][4][5][6][7][8][9][10][11][12][13]. All of these applications have been enabled by making progress along the three main directions of research, namely by striving for higher sensitivity, selectivity and stability [14].…”