PRINCIPLE OF OPERATION
A schematic of the fibre optic pressure and temperature sensor is illustrated in Fig. 1. The fibre optic sensor was fabricated by splicing the 200μm silica glass fibre and the SM FBG to the glass capillary to obtain a robust sensor structure. In addition, the 200μm fibre was cleaved and polished using raw polishing paper several hundred micrometers from the glass capillary/200μm fibre splice, in order to avoid light reflections at the outer surface of the 200μm fibre.