Sagnac interferometry for accurate sensing of non-reciprocal effects /
We experimentally investigated the fiber-optic Sagnac interferometer and its ability to measure accurately phase shifts induced by different non-reciprocal effects. Different types of sensors were implemented based on the Fresnel drag effect (flow sensor), the Sagnac effect (rotation sensor), the Fa...
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=739363361&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | We experimentally investigated the fiber-optic Sagnac interferometer and its ability to measure accurately phase shifts induced by different non-reciprocal effects. Different types of sensors were implemented based on the Fresnel drag effect (flow sensor), the Sagnac effect (rotation sensor), the Faraday effect (magnetic field/current sensor), and time varying effects (dual sensor). The configuration suited for each type of sensor is detailed and evaluated. We also studied and implemented three new Sagnac topologies. First, we looked at a new in-line version of the Sagnac interferometer, which proved virtually immune to time-varying reciprocal perturbations. Second, we proposed a dual sensor version that allows simultaneous and independent recordings of a reciprocal and a non-reciprocal effect. Next, we built a low-noise single-mode fiber gyroscope, using two depolarizers in the loop and a low-cost laser source, set to operate in the coherence collapsed regimen by introducing optical feedback to the laser cavity. This system is used in an experiment to investigate the nature of the Sagnac effect as a combination of the Fresnel drag effect and time-varying effects. Finally, we also discussed some signal demodulation schemes intended to increase the bandwidth and reduce the cost and complexity of the demodulation electronics associated to Sagnac interferometers. |
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| Item Description: | Vita. "Major Subject: Electrical Engineering". |
| Physical Description: | xi, 128 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 118-123. |