For pressure measurement, the sensor is expected to be sensitive
to pressure while possessing low temperature dependence.
Since the pressure sensitivity of this hollow fiber-based sensor
depends on its gauge length, the longer the gauge length the
higher its sensitivity. However, its temperature cross sensitivity
will increase accordingly as well.We found that if the reflecting
fiber was SMF-28 only, the sensor air gap will enlarge when the
temperature increases. To reduce this temperature dependence,
a short piece of MMF (Corning, 50/125 m)