Birefringent crystal temperature compensation based optic fiber pressure sensor and production method thereof

Abstract

The invention discloses a birefringent crystal temperature compensation based optic fiber pressure sensor and a production method thereof. The sensor comprises a Fabry-Perot pressure sensing head chip, a birefringent crystal, a grin lens, a glass capillary, a quartz glass tube and a multimode optical fiber. Optical signals sequentially pass the birefringent crystal and an optical fiber Fabry-Perot pressure sensing head, then optical path difference is modulated, and double-parameter measurement of pressure and temperature is achieved by detecting variation of the optical path difference of the birefringent crystal and the optical fiber Fabry-Perot pressure sensing head. Comparing with the prior art, the optic fiber pressure sensor has the advantages that high-precision pressure measurement sensing are achieved by introducing temperature measuring result as reference quantity and correcting pressure measurement result, besides, a demodulation instrument achieves synchronous demodulation of temperature and pressure, a demodulation system is simple, data processing is accurate, system cost is low, and practical operation is facilitated.

Description

technical field [0001] The invention relates to the technical field of optical fiber pressure and temperature sensors, in particular to an optical fiber Fabry pressure sensor with temperature compensation function and a manufacturing method thereof. Background technique [0002] High-precision fiber optic Fabry pressure sensor has a wide range of applications in the engineering field. As a kind of fiber optic pressure sensor, it has the advantages of anti-electromagnetic interference, small size, and light weight. Its measurement principle is based on the pressure modulation of the optical path difference or light intensity in the output light of the Faphan microcavity to realize high-precision pressure sensing and measurement. However, temperature is an important factor affecting the length of the F-P cavity, and it is difficult to realize high-precision pressure sensing and measurement without temperature compensation of the fiber-optic F-P pressure sensor. [0003] As re...

AI Technical Summary

Problems solved by technology

However, the demodulation principle of fiber optic method is different from that of fiber grating, so the signal demodulation process is more complicated

Using the same demodulation system to simultaneously realize the high-precision demodulation of fiber optic F-P and fiber Bragg grating dual sensors is quite difficult, and the two use independent demodulation systems. The demodulation system is huge, the data processing is complicated, and the cost of the instrument is high. Practical operation inconvenient

Images