Based on the combination of E type diaphragm and cantilever beam,a new fiber Bragg grating(FBG) sensor is proposed to measure the liquid level.A mathematical model about the central reflection wavelength of fiber grating changing with the height of liquid is established.The experiments indicate that within the range of 0-100 cm,the largest central wavelength drifting is 1.316 nm,and the linearity is more than 0.999.Besides,the sensor sensitivity is 13.1 pm/cm which has a 5.1% relative error compared with th...