Fiber tip based sensor system for measurements of pressure gradient, air particle velocity and acoustic intensity
First Claim
1. A fiber optic sensor system for measuring pressure gradient, air particle velocity and acoustic intensity, 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 aligned along a single axis and facing in the same direction, said 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 the acoustic field based on the deflection of said diaphragm affected by the acoustic field.
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Abstract
A fiber optic sensor system for pressure measurements where the design permits multiplexity on the input side of the system and the optical part of the system, which has a sensor Fabry-Perot interferometer and a read-out interferometer, is based on low coherence fiber-optic interferometry techniques. This permits a high dynamic range and low sensitivity to the wavelength fluctuation of the light source as well as to the optical intensity fluctuations. The system includes fiber tip based Fabry-Perot sensors, where each sensor includes a diaphragm as the transducer. A combined pressure gradient sensor, air particle velocity sensor, as well as acoustic intensity sensor is built based on the fiber tip based Fabry-Perot sensors.
45 Citations
20 Claims
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1. A fiber optic sensor system for measuring pressure gradient, air particle velocity and acoustic intensity, comprising:
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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 aligned along a single axis and facing in the same direction, said 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 the acoustic field based on the deflection of said diaphragm affected by the acoustic field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for measuring pressure gradient, air particle velocity and acoustic intensity of an acoustical disturbance, the method comprising the steps of:
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aligning a pair of substantially identical sensors along a single axis, each said 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;
coupling a processor to said pair of said sensors; and
calculating pressure gradient, air particle velocity and acoustic intensity based on the deflection of said diaphragm subjected to the acoustic disturbance. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification