The demand for wearable devices to measure respiratory activity is constantly growing,
finding applications in a wide range of scenarios (eg, clinical environments and workplaces …

Non-dispersive infrared (NDIR) spectroscopy analyzes the concentration of target gases
based on their characteristic infrared absorption. In conventional NDIR gas sensors, an …

The wealth of information concealed in a single human breath has been of interest for many
years, promising not only disease detection, but also the monitoring of our general well …

This paper proposes to apply a newly developed Non-Dispersive Infrared Spectroscopy
(NDIR) gas sensing system composed of pyroelectric infrared detectors to monitor the …

This study presents a multi-gas analyzer based on tunable filter non-dispersive IR (TF-NDIR)
sensors that operate with a wide dynamic range of wavelength and concentration. A …

Human physiological metabolic status can be obtained by monitoring exhaled CO 2
concentration, but current CO 2 sensors have disadvantages such as large size, high power …

Acetone vapor sensing is important for environmental monitoring and non-invasive
screening of diabetes mellitus (DM). Inhaling higher than 176 parts per million (ppm) …

Expiratory CO2 concentrations can directly reflect human physiological conditions, and their
detection is highly important in the treatment and rehabilitation of critically ill patients …

A mid-infrared tunable diode laser absorption spectroscopy (TDLAS) gas sensor based on
hollow waveguide (HWG) gas cell for real-time exhaled carbon dioxide (eCO 2) detection is …

Non-dispersive infrared (NDIR) gas detection systems have been extensively used for gas
monitoring because they are considered the simplest approach with moderate sensitivity …