As a new type of sensor, fiber optic pressure sensors have the advantages of small size, light weight, electrical insulation, immunity from electromagnetic interference, and can be used in flammable and explosive environments compared to traditional pressure sensors. They are suitable for real-time monitoring of health conditions of bridges, dams, and other structures.

There are three different types:

       1、Gauge type: In the case of gauge type sensors, P0 is the surrounding pressure or atmospheric pressure. The gauge type sensor has a vent hole that places the cavity under surrounding pressure or; A cavity sealed to atmospheric pressure

       2、Perfect matching: In the case of perfect matching pressure sensors, P0=0, the cavity is sealed in a vacuum state during factory production

       3、Differential type: In the case of differential type sensors, P0 is any pressure. This type of sensor has a vent joint that is used to maintain the given pressure in the cavity.