Pressure sensing device with high sensitivity

Abstract

The invention provides a pressure sensing device with high sensitivity, which comprises a wideband light source, a circulator, a sensing head and a spectrum analyzer, wherein the sensing head is composed of a corrosion multimode fiber and an ultraviolet adhesive. The pressure sensing device with high sensitivity is characterized in that after the multimode fiber end surface is corroded, a conical cavity is obtained, the ultraviolet adhesive is penetrated in the conical cavity, and an air cavity coated by the ultraviolet adhesive is formed in the conical cavity. The circulator receives light from the wideband light source and transmits the light to the sensing head, the sensing head reflects the light back to the circulator, the light is then transmitted to the spectrum analyzer via the circulator, a similar Fabry-Perot interferometer is formed, and wavelength drift of a reflection spectrum characteristic peak is measured, and thus, the numerical value of a tested environmental parameter can be calculated. The pressure sensing device with high sensitivity is applicable to measurement on various environmental parameters, particularly, pressure measurement, and has the advantages of compact structure, simple manufacturing, high sensitivity, wide measurement range, and low cross sensitivity.

Description

technical field [0001] The invention provides a high-sensitivity pressure sensing device and belongs to the technical field of optical fiber sensing. Background technique [0002] The development trend of sensors is sensitivity, precision, applicability, compactness and intelligence. Among many fiber optic sensors, fiber optic sensors based on Fabry-Perot (FP) cavity have developed rapidly and become an important research field of fiber optic sensors. branch. As one of the important parameters of production and control in aerospace, enterprise production, engineering manufacturing and other fields, pressure has become increasingly important for its detection. Compared with traditional sensors, fiber optic Fabry-Perot interference (FP) pressure sensors have the characteristics of small size, light weight, fast response speed, and strong anti-electromagnetic interference ability. In recent years, optical fiber Fabry-Perot interference (FP) pressure sensors have been widely u...

AI Technical Summary

Problems solved by technology

However, the film-type cavity-type FPI sensors based on the fiber end face are greatly affected by the film, the production is complicated, the cost is high, and the measurement range is small, usually within tens of kPa. At the same time, their mechanical strength is quite poor, and the film attached to the fiber end is very difficult easily damaged

FPI sensors based on changing the RI in the cavity usually have the advantages of wide measurement range and good stability, but their pressure sensitivity is relatively low, usually tens of pm / MPa (except for complex structures and tedious sensing structures)

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