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- W2270291359 abstract "During the manned space missions, the crucial concerns of the spacecraft safety and the crew’s health require long term, real-time trace gas monitoring of the cabin atmosphere to provide early warning of the potentially dangerous events such as overheating of electric wiring insulation, unintended release of chemicals, or malfunctions of the air regeneration system. An advanced trace gas monitoring system for Chinese long-term manned space missions was discussed. In this paper, a novel design of multi-components trace gas analyzer based on infrared photoacoustic spectroscopy technology was proposed for monitoring the cabin atmosphere in space missions. The developed instrument consists of the laser sources, photoacoustic cell, ultra-sensitive acoustic measurement unit, mechanical vibration isolation frame, electronic unit and gas exchange unit. The optical source is a combination of a widely tunable pulsed quantum cascade laser (QCL), distribute feedback (DFB) lasers and DFB QCL. Since the photoacoustic system measures the acoustic pressure wave which is directly related to the absorbed energy by gas molecules, it is immune to the background signal and easily reaches sub-ppm level of detection limits. Different laser source beams are coupled into the photoacoustic cell using a special device stimulated by multi modulation frequencies. The photoacoustic cell is working in nonresonant mode, and the photo thermal displacement is measured with an interferometer. The experimental results of the prototype analyzer show that it can measure the target 32 gases in 30 minutes with satisfying detection requirements for space missions. Comparing to the current instruments for space missions, the proposed analyzer, with the same measurement capabilities, less weight (20kg), and lower power consumption (50W), is an alternative for trace gas monitoring in spacecraft." @default.
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- W2270291359 date "2015-07-12" @default.
- W2270291359 modified "2023-09-24" @default.
- W2270291359 title "Advanced Photoacoustic Spectrometer for Air Monitoring in Manned Spacecraft" @default.
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