Browsing by Author "Debnath, Ratan"
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Item Chip-Scale, Nanoengineered CO2 Gas Sensors for Integrated Spacesuit Monitoring(47th International Conference on Environmental Systems, 2017-07-16) Chullen, Cinda; Xie, Ting; Thomson, Brian; Wen, Baomei; Rani, Asha; Debnath, Ratan; Motayed, AbhishekNASA and N5 Sensors, Inc. through a STTR program are jointly developing ultra-small, low-power carbon dioxide (CO2) and oxygen (O2) gas sensors, ideally suited for integrated space suit monitoring. During extravehicular activities, it is vital to monitor the effectiveness of the Portable Life Support System (PLSS) in real-time to ensure the safety of the astronaut. Due to the unique environmental conditions within the space suit such as high humidity, large temperature swings, and operating pressure swings, measurement of key gases such as carbon dioxide relevant to astronaut’s safety and health are quite challenging. Additionally, size, weight, and power constraints on such detection devices make it impractical to use conventional sensors. Unique chip-scale, nanoengineered chemiresistive gas sensor architecture has been developed for this application, which can be operated in the typical space suit environmental conditions. Unique design combining the selective adsorption properties of the nanoclusters of metal-oxides and metals, provides selective detection of CO2 in high relative-humidity conditions. Future works will focus on sensor design refinement as well as implementation of other on-chip components for reliable operation. In addition, a fully-integrated prototype system will be developed that can be tested in a simulated environment to evaluate the figures of merit.Item Low-Power, Chip-Scale, Carbon Dioxide Gas Sensors for Spacesuit Monitoring(48th International Conference on Environmental Systems, 2018-07-08) Motayed, Abhishek; Chullen, Cinda; Rani, Asha; Shi, Chen; Thomson, Brian; Debnath, Ratan; Wen, BoameiN5 Sensors, Inc. through a Small Business Technology Transfer (STTR) contract award has been developing ultra-small, low-power carbon dioxide (CO2) gas sensors, suited for monitoring CO2 levels inside NASA spacesuits. Due to the unique environmental conditions within the spacesuits, such as high humidity, large temperature swings, and operating pressure swings, measurement of key gases relevant to astronaut’s safety and health such as(CO2), is quite challenging. Conventional non-dispersive infrared absorption based CO2 sensors present challenges inside the spacesuits due to size, weight, and power constraints, along with the ability to sense CO2 in a high humidity environment. Unique chip-scale, nanoengineered chemiresistive gas-sensing architecture has been developed for this application, which can be operated in typical spacesuit environmental conditions. Unique design combining the selective adsorption properties of the nanophotocatalytic clusters of metal-oxides and metals, provides selective detection of CO2 in high relative humidity conditions. All electronic design provides a compact and low-power solution, which can be implemented for multipoint detection of CO2 inside the spacesuits. This paper will describe the sensor architecture, development of new photocatalytic material for better sensor response, and advanced structure for better sensitivity and shorter response times.