Patent ID: 7224465

Claim:
A fiber optic sensor system for measuring pressure gradient, air particle velocity and acoustic intensity of an acoustic disturbance, comprising: at least a pair of substantially identical sensors, each sensor including a diaphragm and a sensing fiber-tip based interferometer having a Fabry-Perot cavity formed between said fiber tip and said diaphragm, said fiber tip and said diaphragm both being optically reflective to form a pair of reflective surfaces of said interferometer, said pair of the sensors being spaced one from the other along a first axis with said diaphragms being oriented in a common direction, the acoustic disturbance deflecting said diaphragm of each said sensor; and a processor operationally coupled to said at least a pair of sensors for calculating pressure gradient, air particle velocity and acoustic intensity of an acoustic field based on the deflection of said diaphragms affected by the acoustic field.