Quartz capillary tube embedded all-silica fiber Fabry-Perot interferometric sensor and manufacturing method thereof

Abstract

The invention discloses a quartz capillary tube embedded all-silica fiber Fabry-Perot interferometric sensor which comprises a single-mode optical fiber, a quartz capillary tube, a reflective optical fiber and a protective film, wherein the reflective optical fiber is a single-mode optical fiber or a multimode optical fiber, the two ends of the quartz capillary tube are respectively connected with one end of the single-mode optical fiber and one end of the reflective optical fiber by way of welding, and the hollow part of the quartz capillary tube is taken as the interferometric cavity of the interferometric sensor. In the interferometric sensor disclosed by the invention, a quartz capillary tube is adopted without plating a film, therefore, the cost for manufacturing the Fabry-Perot interferometric sensor is reduced, and the high contrast of the fiber Fabry-Perot interferometric sensor can be realized. The invention also discloses a method for manufacturing the sensor. The quartz capillary tube embedded all-silica fiber Fabry-Perot interferometric sensor disclosed by the invention has the characteristics of low cost, simple processing method, high miniaturization degree and good mechanical stability, and is convenient for production on large scale; and the practicability of the interferometric sensor is easy to realize, and the interferometric sensor has a potential practical value and a broad market in the field of interferometric sensors.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an optical fiber Fabry-Perot (Fabry-Perot) interference sensor and a manufacturing method thereof. Background technique [0002] In recent years, the optical fiber Fabry-Perot (Fabry-Perot) interference sensor (optical fiber Fabry-Perot interference sensor) has been used in biology, Applications in the fields of medicine, industry, aerospace, military and other fields to sense pressure, strain, displacement, velocity, acceleration, ultrasound and other parameters have attracted extensive attention from domestic and foreign scholars and enterprises. Fiber optic Fabry-Perot interference sensors include intrinsic fiber optic Fabry-Perot interference sensors and extrinsic fiber optic Fabry-Perot interference sensors. Extrinsic fiber optic Fabry-Perot interference sensors are characterized by simple processing methods, strong practicability, and high sensitiv...

AI Technical Summary

Problems solved by technology

[0003] The traditional extrinsic optical fiber Fabry-Perot interference sensor is to insert two sections of optical fiber with flattened ends into the quartz capillary to form a Fabry-Perot interference cavity with a section of air in the middle, and use epoxy resin to bond the contact part between the quartz capillary and the optical fiber However, this type of Fabry-Perot interference sensor has disadvantages such as poor mechanical stability, low strength, and large size.

In addition, there is an extrinsic optical fiber Fabry-Perot interference sensor (US 5528367A, 1996.6.18) made by fusing a hollow-core fiber between two sections of single-mode fiber. Since the hollow-core fiber is difficult to purchase, and the The typical value of the F-P cavity length of the type sensor is within 200 μm, which has limitations in length; there is also an extrinsic fiber Fabry- Perot interference sensor (CN 100516782C, 2009.7.22), because the hollow-core photonic crystal fiber is expensive and requires coating to improve the contrast of its interference fringes, the cost of this type of sensor is expensive

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