Development and characterization of NDIR-based CO₂ sensor for manned space missions

Abstract

Trace gas monitoring system inside the crew cabin of manned space shuttle requires high precision sensor instrumentation with quick response, smaller mass, compact and less power consumption. Trace gases like Carbon dioxide and carbon monoxide are the primary gases whose concentration required to be measure precisely and continuously inside the crew cabin to mitigate hazardous accidental events to occur. Conventional chemical reaction based or mass spectro meter based instruments for monitoring these gases are either bulky or relatively slower in response. Compared to that, Non Dispersive Infrared sensor (NDIR) technique is accurate, quick in response and compact. This paper covers design and realization of indigenously developed proto model Carbon Dioxide sensor based on NDIR technique. Developed sensor has resolution of better than 1ppm with measurement range from 0 to 5% Vol.

Non-Dispersive Near Infrared Gas Flow Cell Design for Oxygenator-Exhaust Capnometry

“…SolidWorks 2019 was used for drawing the GFCs. To verify our selection, the three GFCs were tested for 0% CO2 by means of nitrogen gas (N2) and 9% CO2 (for hypercapnia, CO2 concentration is about 7% [14]) using a custom-made gas testing rig, as shown in Fig. 4 and 5.…”

“…D. S. Shah created a cylindrical optical gas cell with a length of 25mm and a diameter of 20mm, and used Zemax software to examine the light in the chamber. The detection range is from 0 to 30000ppm [14]. In the optical path length designed by Sieber, the emitted IR light experiences triple reflections before being projected on the detector.…”

การพัฒนาต้นแบบเครื่องติดตามอัตราการหายใจแบบพกพา

“…ป่ วย (T. F. Morley,1990) (Peter, 1985). Altshuller, 1974) (Shah et al, 2016) (Forgacs, 1971) (Ndegwa et al, 2009& Jeffrey A., 2005 --------------------------------------------------------------------------------------------------------------------…”