Minitype optical fiber cantilever acceleration sensor

A minitype optical fiber acceleration sensor based on the cantilever is investigated. The sensor mainly makes up of the cantilever and the distributed feedback (DFB) fiber laser. The beam is deformed when the vibration due to the acoustic field applied on the beam. The DFB fiber laser is stuck on the surface of the cantilever beam. It leads to the frequency shift of the output of the fiber laser. By measuring the frequency shift, the acceleration of the vibration can be realized. The center element of the sensor is the cantilever beam and fiber laser, so the mass and volume of the sensor are greatly reduced. The largest dimension of the cantilever beam in this work is just 30mm. And then the cantilevers are taken into simulations and experiments. The experimental results are coincident with the simulations. The experiments of the sensors shows that the acceleration sensitivity is flat and can reach 108Hz/g below 80Hz. And the highest sensitivity is 2.02×109Hz/g. Compared with existing acceleration sensors, this cantilever acceleration sensor can obtain high sensitivity in small scale and light weight.