Optical fiber air pressure sensor and system based on surface plasmon resonance

Abstract

The invention relates to an optical fiber air pressure sensor and system based on surface plasmon resonance, and mainly relates to the field of air pressure measurement. When the optical fiber air pressure sensor is used for measuring air pressure to be measured, when no pressure exists, the liquid in the sealing cavity is gathered together; when pressure exists, liquid flows under the action of pressure; the position of the liquid can be changed by the pressure of external gas; the liquid is distributed around the plurality of metal structures; therefore, surface plasmon polaritons are formedon the surfaces of the plurality of metal structures; so that the resonance wavelengths of the metal structures are changed, the transmission characteristic of the sensing part is changed, the transmission spectrum of the output light passing through the optical fiber is correspondingly changed, and the accurate to-be-measured air pressure is obtained through the corresponding relation between the change of the transmission spectrum of the output light and the air pressure.

Description

technical field [0001] The invention relates to the field of air pressure measurement, and mainly relates to an optical fiber air pressure sensor and system based on surface plasmon resonance. Background technique [0002] Air pressure is the atmospheric pressure acting on a unit area, that is, it is numerically equal to the gravity on a vertical air column extending upwards to the upper boundary of the atmosphere per unit area. The famous Magdeburg hemisphere experiment proved its existence. The international system unit of air pressure is Pascal, abbreviated as Pa, and the symbol is Pa. In the prior art, the air pressure is mainly measured through an air pressure sensor. [0003] The main sensing element of the air pressure sensor of the air compressor is a thin film sensitive to the strength of the air pressure and a thimble opening control. In terms of circuit, it is connected with a flexible resistor. When the pressure of the measured gas decreases or increases, the d...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a surface plasmon resonance-based optical fiber air pressure sensor and system to solve the problems in the prior art due to the air compressor used for a period of time due to the Plastic deformation, unable to accurately drive the thimble to rotate, making the air pressure sensor's measurement of air pressure inaccurate

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