Research Article
Fiber Bragg Grating Sensors-Based In Situ Monitoring and Safety Assessment of Loess Tunnel
Table 1
Specifications for the SM125-500 [
33].
| Specifications | SM125-500 |
| Number of optical channels | 4 (8 & 16 available) | Wavelength characters | | Range | 1510–1590 nm | Accuracy | 1 pm | Stability | 1 pm | Repeatability | 0.5 pm at full speed and 0.2 pm with 10 averages | Dynamic range | 50 dB | Scan frequency | 1 Hz (2 and 5 Hz available) | Typical sensor spacing | >2x sensor bandwidth | Optical connectors | FC/APC (E2000 available) | Operating temperature | 0° to 50°C |
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