Current sensor utilizing heterodyne detection
Based on the Faraday effect for measuring ac current, we describe a fiber-optic sensor that uses laser-diode intensity modulation to perform heterodyne signal detection. The sensor output at the carrier frequency is used as a reference signal to normalize the results. The sensing element consists of...
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| Andre forfattere: | , , |
| Format: | article |
| Sprog: | engelsk |
| Udgivet: |
1999
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| Fag: | |
| Online adgang: | https://hdl.handle.net/20.500.12008/20776 |
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| Summary: | Based on the Faraday effect for measuring ac current, we describe a fiber-optic sensor that uses laser-diode intensity modulation to perform heterodyne signal detection. The sensor output at the carrier frequency is used as a reference signal to normalize the results. The sensing element consists of a few coils low-birefringence fibers between polarizers. We built the current sensor described above and tested its performance—sensitivity and noise—as functions of the angle between polarizers. |
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