Abstract A probe-shaped sensor for simultaneous temperature and pressure measurement was reported in this article. The effective length of the ∼2mm, consisting a fiber Bragg grating (FBG) Fabry-Perot interferometer (FPI) with nano silica diaphragm. response sensitivities were measured as −0.98 nm/MPa 11.10 pm/°C, respectively. This had an extremely low cross-sensitivity between temperature, whi...