Gas leak detection by diode laser absorption spectrometry |
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| Affiliation: | 1. Lucideon Ltd, Stoke-on-Trent, UK;2. AO Research Institute Davos, Davos, Switzerland;3. Imperial College London, Department of Materials, London, UK;4. Advanced Materials Department, Jožef Stefan Institute, Ljubljana, Slovenia;1. School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, 453003, People''s Republic of China;2. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400030, People''s Republic of China;3. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, People''s Republic of China;1. Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, USA;2. Department of Orthopedics, Case Western Reserve University, Cleveland, OH 44106, USA;3. Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA;1. McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA;2. Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104, USA;3. Translational Musculoskeletal Research Center (TMRC), Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, PA 19104, USA |
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| Abstract: | Diode laser atomic absorption measurements of argon traces in low-pressure discharges were carried out to detect and measure gas leaks in a test chamber. Helium flows as a carrier gas through the test chamber and the discharge. In the case of a leak, air and thus also its natural content of argon is mixed to the helium gas-flow through the chamber. The argon content of the mixed gas flow through the discharge is determined by wavelength modulation diode laser atomic absorption spectrometry. The resulting absorption signal is a measure for the existing leak-rate. For barometric pressure of ambient air lowest detectable leak rates are typically 10−6 mbar l s−1. By application of pure Ar with pressures above 1 bar detectable leak rates can in practice be lower than 10−8 mbar l s−1. |
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