Abstract
Simultaneous real-time acquisition of analytical data from several locations is attractive in a variety of applications. This brief review traces the evolution of approaches to such measurements. Greatest emphasis is placed on optical time-of-flight chemical detection when signals are multiplexed from several point sensors or when the measurements are taken along the length of a single continuous extended-length `distributed' sensing element. The use of sensors featuring extended-length continuous chemically sensitive optical fibers offers detection arrangements for which there is no counterpart in conventional chemical sensor technologies.
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