23 July 1993 Four-channel interferometric displacement sensor
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Proceedings Volume 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology; 1983C2 (1993) https://doi.org/10.1117/12.2308853
Event: 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1993, Budapest, Hungary
Abstract
The application of interferometer as a spectral transducer in fiber optic sen- sors (FOS) provides the combination of high sensitivity of interferometric devises with absolute accuracy and reliability of spectral encoding. Different techniques may be used to analyze sensor's output spectrum. In1 an additional tunable inter- ferometer was applied to produce fringes of superposition. In this case, however, the severe problem of accurate measurement of the reference interferometer's opti- cal path difference (OPD) appears. It's overcoming results in dramatic sophistica- tion of FOS's optical and electronic processing schemes. An alternative approach deals with the straightforward and accurate detection of the output spectrum by means of micro-optic spectrometer with CCD photodetector. Recently, 2 3pressure and pe temrature FOS based on this principles have been reported' , but their measurement ranges werelimited by the single free spectral range of interferometer. Such performance produces an error when the change of OPD exceeds A, (where 2k, is the optical carrier wavelength). In the present paper we propose to detect simulta- neously several resonances of interferometer's spectral output and determine the number N of interference order for the exploited minimum (or maximum). This proce- dure provides the reliable fixed internal zero and the tremendous extension of the device's dynamic range.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
V. Greco, "Four-channel interferometric displacement sensor", Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1983C2 (23 July 1993); doi: 10.1117/12.2308853; https://doi.org/10.1117/12.2308853
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