COMPENSATION OF OUTPUT SIGNAL TEMPERATURE DEPENDENCE IN HOMODYNE DEMODULATION TECHNIQUE FOR PHASE FIBER-OPTIC SENSORS
| Autor: | Plotnikov Michael Yurievich, Mekhrengin Mikhail Viktorovich, Pogorelaya Daria Andreevna, Shuklin Philipp Alexandrovich, Kireenkov Alexander Yu. |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Materials science
compensation of temperature dependence business.industry Mechanical Engineering Phase (waves) interferometric fiber-optic sensors Signal Atomic and Molecular Physics and Optics lcsh:QA75.5-76.95 Computer Science Applications Electronic Optical and Magnetic Materials Compensation (engineering) Direct-conversion receiver Optics Demodulation lcsh:QC350-467 homodyne demodulation technique Fiber lcsh:Electronic computers. Computer science business lcsh:Optics. Light Information Systems |
| Zdroj: | Naučno-tehničeskij Vestnik Informacionnyh Tehnologij, Mehaniki i Optiki, Vol 15, Iss 2, Pp 227-233 (2015) |
| ISSN: | 2500-0373 2226-1494 |
| Popis: | Modified phase-generated carrier homodyne demodulation technique for fiber-optic sensors is presented. Nowadays phase-generated carrier homodyne demodulation technique is one of the most widespread. One of its drawbacks is the temperature dependence of the output signal because of the modulator scale factor temperature dependence. In order to compensate this dependence an automatic adjustment of the phase modulation depth is necessary. To achieve the result, additional harmonics analysis is used with the help of the Bessel functions. For this purpose the known demodulation scheme is added with the branch, where interferometric signal is multiplied by the third harmonic of the modulation signal. The deviation of optimal ratio of odd harmonics is used as a feedback signal for adjusting the modulation depth. Unwanted emissions arise in the feedback signal, when the third harmonic possesses a value close to zero. To eliminate unwanted emission in the feedback signal, the principle scheme is added with one more branch, where interferometric signal is multiplied by the forth harmonic of the modulation signal. The deviation of optimal ratio of even harmonics is used as a feedback signal alternately with the deviation of optimal ratio of odd harmonics. A mathematical model of the algorithm is designed using the MATLAB package. Results of modeling have confirmed that suggested method gives the possibility for an automatic adjustment of the phase modulation depth and makes it possible to compensate temperature dependence for the modulator scale factor and output signal magnitude. |
| Databáze: | OpenAIRE |
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