Fig. 1. (a) Scheme of FBG demodulation system; (b) Photograph of calibrating demodulation system

Fig. 2. (a) The photo of FFP-TF; (b) Structural schematic of FFP-TF

Fig. 3. (a) The photo of FFPE; (b) Structural schematic of FFPE; (c) Calibration waveforms for calibrating etalon and measured etalon

Fig. 4. Schematic of the demodulation principle

Fig. 5. Flowchart of gross error processing

Fig. 6. Linear fitting of measured value and real value

Fig. 7. Histogram plot of the deviation