An optical fiber sensing device for detecting physical parameters such as pressures, strains and temperatures comprises a probe housing therein an optical fiber. The distal end of the probe houses a distal portion of the optical fiber having a section provided with a fiber Bragg grating. The proximal end of the probe is mounted into a holder. The optical fiber is sealably mounted into the probe housing with a first seal overlaid the proximal portion of the optical fiber The seal may extend to about the proximal end of the optical fiber section with the Bragg grating. A second seal is overlaid the distal portion of the optical fiber and extends from the distal end of the probe to about the distal end of the optical fiber section with the Bragg grating. The proximal end of the probe is communicable with a fiber Bragg grating interrogation system.