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We describe an ultrasonic instrument for continuous real-time analysis of the fractional mixture of a binary gas system. The instrument is particularly well suited to measurement of leaks of a high molecular weight gas into a system that is nominally composed of a single gas. Sensitivity < 5 × 10(-5) is demonstrated to leaks of octaflouropropane (C3F8)(More)
The ATLAS silicon tracker community foresees an upgrade from the present octafluoropropane (C<inf>3</inf>F<inf>8</inf>) evaporative cooling fluid &#x2014; to a composite fluid with a probable 10&#x2013;20% admixture of hexafluoroethane (C<inf>2</inf>F<inf>6</inf>). Such a fluid will allow a lower evaporation temperature and will afford the tracker silicon(More)
We describe a combined ultrasonic instrument for continuous gas flow measurement and simultaneous real-time binary gas mixture analysis. In the instrument, sound bursts are transmitted in opposite directions, which may be aligned with the gas flow path or at an angle to it, the latter configuration being the best adapted to high flow rates. Custom(More)
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