Optical fiber F-P pressure sensor and pressure liquid level sensing device thereof

Abstract

The invention discloses an optical fiber F-P pressure sensor and a pressure liquid level sensing device thereof, relating to a type of pressure sensor. The structure of the sensor is that: a pressure film box / plate provided with pressure injection holes is arranged at the center and connected with the periphery of the opening of a supporting member in a sealing way; the center of the bottom of the supporting member is provided with optical fixing holes and pressure balancing holes, and the optical fixing holes are connected with conductive optical fiber; and an extrinsic F-P cavity is arranged between the end face of the conductive optical fiber and the central plane of the pressure film box / plate. The sensor features simple structure, small volume, convenient mounting, high pressure resolution and is very suitable for measuring requirement of small range and high precision; sensitive elements can be replaced conveniently to adapt to the different measuring requirements; the cost is lower and no special demands for light source wavelength exists; the invention is applicable to computation of storage quantity of small chemical liquid and oil stock tank, chemical / oil stock and transportation tank vehicle and other various types of liquid / gas stock and transportation equipment.

Description

technical field [0001] The invention relates to a pressure sensor, in particular to an optical fiber F-P pressure sensor and a pressure liquid level sensing device thereof. Background technique [0002] There are many designs for the F-P cavity. The design of the F-P cavity pressure liquid level sensor used in liquid level measurement mainly focuses on the design of the elastic element sensitive to displacement and its corresponding pressure. Existing schemes include: early silicon wafers, Invar sheets and Bourdon tubes, and recently large linear range bellows. [0003] The disadvantages of silicon wafers and Invar sheets are small linear elastic range, complex structure, and limited measuring range; while bellows can solve the problem of a large range, but the measurement accuracy is insufficient. [0004] However, the design of pressure bellows / sheets commonly used in pressure instruments has not been reported yet. Contents of the invention [0005] The purpose of the ...

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Problems solved by technology

[0003] The disadvantages of silicon wafers and Invar sheets are that the linear elastic range is small, the structure is complex, and the measurement range is limited; while the bellows can solve the problem of a large range, but it is insufficient in measurement accuracy.

[0004] However, the design of pressure bellows / sheets commonly used in pressure instruments has not been reported yet.

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