Abstract
A novel demodulation scheme for the ranging of reflective markers is presented. This method is useful for implementing in-line mul- tiplexing of displacement and temperature sensors based on low- coherence interferometry. It allows the discrimination of reflective mark- ers such as air-gap connectors or other partial reflectors spaced by as little as 0.1 m and the measurement of deformations occurring between two successive reflectors with a resolution of 2 mm. The multiplexing of two displacement sensors is demonstrated experimentally. This type of sensor is especially useful for the long-time geometrical monitoring of large structures. © 1997 Society of Photo-Optical Instrumentation Engineers. (S0091-3286(97)01409-8)
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