Design and fabricate a novel micro-force sensor.The fiber Bragg grating（ FBG） is packaged into columnar by polyurethane

one end is fixed on baseplate of the shell and the other end is fixed with one end of lever

through lever principle

play a role of sensitization to micro-force.The sensitivity of sensor is 0.952 nm / N

when the force change is 0

0.1666 N

and it is about 3.81 times of the bare optical fiber tension.The structure can fit with different measuring ranges and sensitivities by changing ratio of lever.