Fiber optic pressure sensor with passive temperature compensation

Abstract

A temperature compensated intrinsic optical fiber pressure sensing device includes an intrinsic fiber optic sensor formed in a core of an optical fiber. A diaphragm responsive to a pressure in an environment applies a longitudinal strain in the optical fiber, thereby inducing a pressure stress in the intrinsic fiber optic sensor. The intrinsic fiber optic sensor is responsive to an optical signal and to the pressure stress for providing a sensing light signal indicative of the pressure. A temperature compensation members are responsive to a temperature for applying a longitudinal strain in the optical fiber, thereby inducing a temperature compensation stress in the intrinsic fiber optic sensor indicative of the temperature, wherein changes in the sensing light signal that are attributable to changes in the temperature compensation strain substantially compensates for changes in the sensing light signal attributable to changes in the temperature of the intrinsic fiber optic sensor.

Dependencies are inferred from the claim text.