Fibre grating pressure sensor with enhanced sensitivity using a glass-bubble housing

A fibre Bragg grating pressure sensor with enhanced sensitivity has been demonstrated, using a grating housed in a glass bubble. This configuration increases the pressure sensitivity and effectively reduces the thermal crosstalk by a Factor of 4, A pressure resolution of 0.5% over a full measurement range of 14 MPa has been achieved, This concept could lead to a range of sensors using fibre gratings with mechanical amplifiers to enhance sensitivity.