Long Distance Measurement System by Optical Sampling Using a Femtosecond Laser
A long-distance measurement system is proposed in this paper, which is based on optical sampling using a femtosecond fiber laser. The measurement principle and the importance of dispersion compensation are theoretically analyzed in the time domain. By sweeping the repetition rate periodically, stabl...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2018-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/8466961/ |
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| Summary: | A long-distance measurement system is proposed in this paper, which is based on optical sampling using a femtosecond fiber laser. The measurement principle and the importance of dispersion compensation are theoretically analyzed in the time domain. By sweeping the repetition rate periodically, stable cross-correlation patterns are acquired, and the unknown distance can be calculated from the interference information. A long optical delay line is placed in the signal path, which can eliminate the “dead zone” effect and improve the performance of long-range measurement. The experimental results show that the present system can realize an accuracy of 4 μm over a 60-m distance, corresponding to a relative precision of 6.7 × 10<sup>−8</sup>. The all-fiber optical path system provides a balance among long range, high resolution, and rapid measurement, with the potential for the development of instrumentation for precision engineering applications. |
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| ISSN: | 1943-0655 |