In order to achieve level of variable sensitivity monitoring is designed using a fiber Bragg grating（ FBG） with variable sensitivity level probe. Liquid pressure on film is transmitted to cantilever beam through pressure bar

FBG is pasted on upper surface of cantilever beam

using sensitivity shift valve to change cantilever length

so as to change sensitivity of sensor. Calculated deformation properties of the cantilever beam by finite element simulation and optimization. The length of cantilever beam are adjusted to 100 mm

90 mm

80 mm. In all the above-mentioned states

the maximum deformation occurs in the tip of cantilever beam

which are 4. 266

3. 457

2. 736 mm respectively. Corresponding where bare grating pasted

the sensitivitues are 2. 0

1. 5

1. 0 mm /m

to achieve sensitivity transformation.