| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 732326 | Optics & Laser Technology | 2013 | 5 Pages |
This paper demonstrates a high resolution and wide scale fiber Bragg grating sensor interrogation system based on fiber Fabry–Perot tunable filter (FFP-TF) and Fabry–Perot ITU filter (FPIF). By automatic control of the driving voltage of the FFP-TF, the wavelength of the laser can be tracked to the −3 dB reflectivity spectrum of the FBG. Using FPIF as the reference channel, the measurement resolution of the system is improved by wiping out the nonlinearity of the FFP-TF. A high resolution of better than 2 pm within wide strain measurement range was verified by experiments.
► High resolution and wide measurement scale. ► Automatic tracking of the FFP-TF driving voltage to −3 dB spectrum of FBG. ► Two stage auto-adapt driving voltage can provide best resolution and high speed. ► Environmental temperature can be measured before dynamic strain is applied. ► Automatic calibration of the tuning voltage versus wavelength shift.
