Long chirped fiber grating pressure tactile sensing

In this study, a distributed tactile sensing system based on long chirped fiber grating (LCFBG) is proposed. The simulation model and sensing principle of the tactile sensing system are well illustrated. The experiments show that the sensitivity coefficients of the sensing system loaded by point contact force and 15 mm width surface contact force are 1.04 dBm/N and 1.87 dBm·mm/N, respectively. Their linearity is above 99.5%. In the deformation sensing experiment, the reflection spectrum has a good linear relationship with the strain change. The sensor can be applied to the precise measurement and positioning of touch sensing of manipulator.