Fiber-Optic Microprobe For Interferometric Measurements In Generators. De Maria, L., Martinelli, M., Pistoni, N., C., & Barberis, A. In Proceedings of SPIE - The International Society for Optical Engineering, volume 867, pages 175-181, 6, 1988.
Fiber-Optic Microprobe For Interferometric Measurements In Generators [link]Website  abstract   bibtex   
In the framework of the development of an extrinsic type fiber-optic interferometric sensor, the design and the qualification tests of the sensing microprobe are presented. The microprobe is the end-termination of a fiber-optic instrument devised for the monitoring of the end-turn vibrations of large generators. Since the monitoring must be made in real operating conditions, the microprobe must survive in real harsh environment: 100 C average temperature, very high electromagnetic field (30000 Amp. average current), pure hydrogen at 4 atmosphere pressure, high mechanical noise. The microprobes were developed following two approaches: conventional and stacked micro-optics concept. Several thermal tests showed a better behaviour by the stacked-optic microprobe. During the test, autointerference modulation phenomena appeared on the control beams. A hypothesis of a polyetalon existence inside the microprobe was formulated and its correctness was supported by a computer simulation. Preliminary qualification tests of the whole interferometric instrument, ended by the stacked-optic microprobe, showed an excellent response over the whole thermal operating range.
@inproceedings{
 title = {Fiber-Optic Microprobe For Interferometric Measurements In Generators},
 type = {inproceedings},
 year = {1988},
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 pages = {175-181},
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 month = {6},
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 abstract = {In the framework of the development of an extrinsic type fiber-optic interferometric sensor, the design and the qualification tests of the sensing microprobe are presented. The microprobe is the end-termination of a fiber-optic instrument devised for the monitoring of the end-turn vibrations of large generators. Since the monitoring must be made in real operating conditions, the microprobe must survive in real harsh environment: 100 C average temperature, very high electromagnetic field (30000 Amp. average current), pure hydrogen at 4 atmosphere pressure, high mechanical noise. The microprobes were developed following two approaches: conventional and stacked micro-optics concept. Several thermal tests showed a better behaviour by the stacked-optic microprobe. During the test, autointerference modulation phenomena appeared on the control beams. A hypothesis of a polyetalon existence inside the microprobe was formulated and its correctness was supported by a computer simulation. Preliminary qualification tests of the whole interferometric instrument, ended by the stacked-optic microprobe, showed an excellent response over the whole thermal operating range.},
 bibtype = {inproceedings},
 author = {De Maria, L and Martinelli, Mario and Pistoni, Natale C. and Barberis, Angelo},
 editor = {Greenwell, Roger A.},
 booktitle = {Proceedings of SPIE - The International Society for Optical Engineering}
}

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