| 摘要 |
A vapour generator is described, including a gas inlet, a sample permeation chamber, a sample flow outlet, and a split flow outlet. A gas flow path is defined from the inlet through the permeation chamber to the outlets. A valve or similar for splitting the gas flow is located after the sample permeation chamber. This arrangement ensures that the flow rate of gas passing the permeation source is constant, as is the concentration of analyte carried by the gas. Variation of the split flow to sample flow rate may be used to vary the concentration of analyte entering a measurement device coupled to the vapour generator, such as an ion mobility spectrometer. Also described is a method of manufacturing a permeation source for use in the vapour generator. |
