Patent ID: 9581514
Date: 2017-02-28
CPC Classifications: G01D,G01J,G01L

Claim:
1. An optical pressure sensor comprising: a sensor head comprising a pressure sensing optical cavity and at least one temperature sensing optical cavity; and an interrogator optically coupled to the sensor head, the interrogator comprising: a first optical analyser arranged to detect a response of the pressure sensing optical cavity to pressure at the sensor head and to output a corresponding pressure sensing cavity output signal, and a second optical analyser, separate and distinct from the first optical analyser, arranged to detect a response of the at least one temperature sensing optical cavity to temperature at the sensor head and to output a corresponding temperature sensing cavity output signal, wherein the interrogator is arranged to generate at least one signal representing pressure at the sensor head responsive to the pressure sensing cavity output signal, the at least one signal representing pressure being temperature corrected by the interrogator responsive to the temperature sensing cavity output signal; and wherein the first optical analyser is arranged to detect the response of the pressure sensing optical cavity to pressure at the sensor head and output the corresponding pressure sensing cavity output signal at a first rate, and the second optical analyser is arranged to detect the response of the temperature sensing optical cavity to temperature at the sensor head and output the corresponding temperature sensing cavity output signal at a second rate, wherein the first rate is faster than the second rate.