Miniature temperature-pressure integrated packaged optical fiber Fabry-Perot pressure sensor and preparation method thereof

Abstract

A miniature temperature-pressure integrated packaged optical fiber Fabry-Perot pressure sensor comprises an optical fiber assembly, a capillary tube, an optical fiber patch cord, a thermocouple, a temperature-pressure integrated structure, a sleeve and a connecting thin tube. The optical fiber assembly sequentially comprises a jumper welding end with a coating layer removed, an optical fiber with a coating layer, a core body end optical fiber with a coating layer removed and a Fabry-Perot pressure sensitive core body in the axial direction, and the Fabry-Perot pressure sensitive core body penetrates into the capillary tube till one end of the coating layer and the end face of the capillary tube are mutually blocked. The core body end optical fiber without the coating layer is welded with the capillary tube, and the jumper welding end without the coating layer is welded with the optical fiber jumper; an optical fiber capillary tube matching body formed by welding the optical fiber assembly and the capillary tube and the thermocouple penetrate into the sleeve in parallel; the temperature and pressure integrated structure comprises an upper half part and a lower half part, the upper half part is connected with the sleeve through a connecting thin tube, through holes are formed in the upper half part and the lower half part, and the optical fiber capillary tube matching body and the thermocouple penetrate through the through holes of the temperature and pressure integrated structure after penetrating through the sleeve and the connecting thin tube and are sealed through high-temperature glue.

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