Vol. 17, issue 02-03, article # 3

pdf Sherstov I.V., Kapitanov V.A., Ageev B.G., Karapuzikov A.I., Ponomarev Yu.N. Laser optoacoustic leak detector. // Atmospheric and oceanic optics. 2004. V. 17. No. 02-03. P. 102-105.
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An optoacoustic (OA) leak detector based on a commercially available CO2 laser is proposed to be used for testing leak-proofness of vacuum vessels. The leak detector with a differential Helmholtz resonator was applied to detection of SF6 admixtures introduced into weak gas flows. The dependence on the flow rate of a gas sample in the detector was analyzed. The minimum detectable flow rate was estimated to be ~ 1 10-9 Pa m3/s, which is comparable with the sensitivity of commercial He leak detectors.