12 June 2000 High-resolution signal demodulator for white-light interferometric sensing systems for smart structures
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White light interferometric sensing systems are very attractive for application in smart structures due to the fact that they read out the absolute path differences from the transducers so that calibration schemes and device history do not have to be used and that they can be serially multiplexed. The basic output from such systems consists of arrays of data containing complex interference patterns. In this paper, a new technique is presented in which the signal from one or more white light interferometers can be demodulated with high resolution. In the technique, the conventional demodulation approach of a Fizeau wedge and linear detector array is replaced by a rotated wedge and a 2-D array such as a CCD. This results in a sampling resolution equal to the linear sampling number of points squared. A theoretical description of the technique is given and planned experimental validation is described.
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William B. Spillman, William B. Spillman, Zhaoju Luo, Zhaoju Luo, } "High-resolution signal demodulator for white-light interferometric sensing systems for smart structures", Proc. SPIE 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (12 June 2000); doi: 10.1117/12.388142; https://doi.org/10.1117/12.388142

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