| 摘要 |
A sensing unit is presented for use in identifying at least one foreign substance in a region of interest. The sensing unit comprises at least one measurement unit, which comprises one or more sensor elements each configured and operable to be responsive to at least one foreign substance in the vicinity thereof. Each sensor element is mounted in its own compartment having an inlet and an outlet thus defining an environmental region in the vicinity of the sensor element separated from the surroundings of the compartment.
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