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- W2001625348 abstract "We demonstrate the feasibility of optically demodulating and processing the output produced by aninterferometric fiber sensor. A technique for providing the time filtering of an optical signal in theoptical domain based on the use of a doped fiber section is reported.Optical processing is a field which offers enormous potential for rapid, parallel processing ofinformation, and is an area which will continue to experience significant growth over the comingyears. Optical sensors have a natural inherent compatibility with this form of processing, whichcould be utilized to great advantage for processesing the data from large arrays of sensors. Manyforms of fiber optic sensor, however, produce an optical output which does not vary in a uniformfashion with the measurand field, and consequently require a linearization circuit. or 'demodulator'to provide a linear transfer function before a signal could be converted back to the optical domainand operated on by an optical processor. This is particularly true with interferometric fiber sensorswhich exhibit a cosine squared transfer function. To demodulate this form of output, a range ofdemodulation schemes have been developed, such as active phase tracking homodyne [1], phasegenerated carrier (PGC) passive homodyne [2], and synthetic heterodyne [3J. These techniquesallow the detection of measurand-induced phase shifts down to the irad/'JHz level over a wide rangeof frequencies with high linearity and wide dynamic range. Certain forms of interferometric sensorsdesigned for low frequency measurands, such as magnetometers and electhc field sensors, requirethe additional demodulation of a 'dither' induced phase carrier signal which is modulated by the DCand low frequency measurand information. In such systems, the overall demodulation processrequires several electronic processing blocks after photodetection of the interferometer signal. Inapplications where arrays of such sensors are of interest, a significant amount of electronics may berequired to fully demodulate the sensor outputs. We have examined the practicality of using opticaltechniques to perform much of the demodulation process, and in this paper demonstrate thefeasibility of this concept." @default.
- W2001625348 created "2016-06-24" @default.
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- W2001625348 date "1994-09-14" @default.
- W2001625348 modified "2023-09-23" @default.
- W2001625348 title "Optically demodulated interferometric sensor system" @default.
- W2001625348 doi "https://doi.org/10.1117/12.185070" @default.
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