1998 Fiscal Year Final Research Report Summary
Fiber-Optic Sensing Using Low-Coherence Light Sources
| Project/Area Number |
09450027
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | GUNMA UNIVERSITY |
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Principal Investigator |
YOSHINO Toshihiko Gunma University, Faculty of Engineering, Professor, 工学部, 教授 (90013169)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Yoshitaka Gunma University, Faculty of Engineering, Research Associate, 工学部, 助手 (30216767)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Optical Sensing / Acoustooptic Effect / Absolute Measurement / Strain Sensor / Temperature Sensor / Two-Mode Fiber / Time Delay Scanner / Low-Coherence Interferometry |
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| Research Abstract |
We have demonstrated the utility of the acoustooptic time delay scanning in fast absolute measurement with full electronic signal processing using simple analog circuits. In our demonstration, measurements of temperature compensated absolute strain over 1600 muepsilon in the temperature range from 20 to 60 ﾟC and also the corresponding absolute temperature have been carried out with resolutions of the order of 40 IOTAepsilon and 0.7 ﾟC, respectively. The cross-sensitivity between the temperature and strain is found to be below the limit of experimental resolution. We performed our experiments in a stable room temperature environment so that the scanning interferometer for signal detection was not affected by any unwanted temperature variations. However, in a situation where temperature is changing, the scanning interfer- ometer can conveniently be thermally insulated. The measurement errors stem mainly from the jitters present in the signal arising from signal generators used in producing the RF pulse and also from the signal processing electronics, and we believe that there is further scope for improving resolution by suppressing such jitters.
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