Prototype fibre-optic-based ultrahigh pressure remote sensor using dual-wavelength coherence reading

A prototype singlemode fibre-based ultrahigh pressure remote sensor based on a Fizeau cavity using a dual-wavelength coherence reading technique has been constructed capable of remote operation at distances up to 10km. A range to resolution of approximately 1.67*10⁴:1 and an overall measurement accuracy of approximately +or-0.67% over a pressure range of approximately 1000bar have been achieved.