Graseby Dynamics Limited

Robert Fagan Donat Bradshaw

Stephen John Taylor

A fluid sampling system has a drift cell ( ) enclosing a first fluid. An inlet chamber ( ) communicates with the body of first fluid via an orifice ( ). A series of negative pressure pulses is applied to the first fluid, causing a sample of a second fluid to be drawn in through the orifice ( ). The sample is then entrained into the air flow of a closed loop circulatory system and is detected or measured by an ion mobility spectrometer. A second chamber may be linked to the first chamber, with the negative pressure pulses provided by the second chamber.

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Wiltshire, United Kingdom

Robert Fagan Donat Bradshaw