| 摘要 |
A device for use in monitoring optical markers present in a liquid flowing in a conduit comprises a transparent tube 7 connectable in the conduit by pipe couplers (not shown) contained in housings 8, 9, and two optical tranceivers 1, 2 mounted on a segmented printed circuit board 3, 4 wrapped around the tube 7 such that the tranceivers 1, 2 face one another. In use, the tranceivers 1,2 produce infra-red radiation and detect infra-red radiation transmitted and/or reflected by any optical markers, e.g. bubbles, present in the liquid. The tranceivers 1, 2 are connected to a digital signal processor (not shown) programmed to determine, from the signals, a selected property, e.g. carbonation level, of the liquid.
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