Fiber Bragg Grating Strain Sensors for Marine Engineering

For the health monitoring of the offshore drilling platform in the salt-fog environment, three nonmetallic materials, i.e., silica, FR-4 epoxy board and sheet molding compound （SMC）, with the good anti-corrosion ability were chosen as the packaging materials for the fiber Bragg grating （FBG） strain sensors. By selecting a highly sensitive structure of the fiber Bragg grating strain sensor, the performances of the sensors with three materials were investigated both numerically and experimentally. The strain sensitivities were 3.76pm/με, 3.02pm/με and 3.03pm/με, respectively. The linearity was better than 0.998. It provides useful information for developing sensors for the marine engineering.