FIBER OPTIC PIEZOMETER
FOR LONG TERM MONITORING
Rugged, Stainless steel or Titanium construction and safe, the FOP piezometer is suitable for use in long-term reliability.
Our unique design is based on non-contact deflection measurement of a stainless steel diaphragm, as opposed to more conventional measurement techniques.
The pressure transducer is based on Fabry-Perot interferometry. Pressure creates a variation in the length of a Fabry-Perot cavity consisting of the inner surface of the stainless steel diaphragm on one side and of an optical fiber on the other.
Since fiber optic readout units and dataloggers can consistently and accurately measure the cavity length under all conditions of temperature, EMI, humidity and vibration, the system delivers reliable pressure measurements in the most adverse conditions. The mechanical robustness is assured by the all-welded stainless steel construction, with no epoxy, sealing rubber or other sort of polymeric material.
Five models of FOP piezometers are available:
The FOP is designed to be embedded in earth fills, at concrete/ earth interfaces or inserted into boreholes and small-diameter pipes. The end of the FOP is fitted with a high or low air entry filter, which protects the sensing element from solid particles, allowing this model to sense only the fluid pressure to be measured. The filter is easily removable for saturation.
200, 350, 500, 750, 1000, 1500, 2000, 3000, 5000, 7000 kP
1.5 × F.S.
FOP-F / FOP-Ti
Stainless steel / Titanium
Stainless steel & FOP, ~ 50 μm, ~ 10 kPa, low air entry