These are the Fabry-Pérot interferometer (FPI) and fibre Bragg grating (FBG). The FPI is an extrinsic sensor that uses interference between multiple light rays reflected back and forth between two surfaces in a cavity. Althen's Fiber Optic Pressure Sensors offer cutting-edge technology for applications requiring high-precision pressure measurement in environments where traditional sensors may fail. Compared with conventional sensing technologies, FOS demonstrates superior capabilities in. Fiber optic pressure sensors use light modulation to measure pressure, offering high sensitivity, EMI immunity, and wide-ranging applications.