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Preparation method for fabry-perot sensor based on corroded high doping optical fiber

A manufacturing method and high-doping technology, applied in the direction of using optical devices to transmit sensing components, etc., can solve the problems of poor mechanical strength, small fiber diameter, and difficult welding of Philips sensors, and achieve low cost, reduce corrosion, and reduce corrosion. The effect of reducing the corrosion rate

Inactive Publication Date: 2009-10-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Moreover, after the cladding is corroded, the diameter of the optical fiber is very small, which leads to difficulty in welding and poor mechanical strength of the fabricated FAP sensor.

Method used

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  • Preparation method for fabry-perot sensor based on corroded high doping optical fiber
  • Preparation method for fabry-perot sensor based on corroded high doping optical fiber
  • Preparation method for fabry-perot sensor based on corroded high doping optical fiber

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[0023] The schematic diagram of the manufacturing method of fiber Fabry Perot sensor based on corrosion of highly doped fiber is as follows Figure 1 ~ Figure 3 Shown. First, a 40% mass ratio of hydrofluoric acid solution and a 35% mass ratio of hydrochloric acid solution were made into an etching solution with a total volume of 60 mL at a volume ratio of 3:1. The highly doped fiber uses the erbium-doped single-mode fiber of Nufern, the model is EDFC-980-HP. Cut the end face of the erbium-doped fiber flat, such as figure 1 As shown above, put the corrosive liquid into the corrosive processing. After 25 minutes, take out the corroded erbium-doped fiber and soak it in deionized water for about 20 minutes to wash away the remaining corrosive liquid, and then place it in a dust-free environment to dry or blow it dry with a hair dryer for later use. The core part of the fiber end face will be corroded into a micro-hole, and the three-dimensional profile of the actually corroded fiber e...

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Abstract

The invention discloses a preparation method for a fabry-perot sensor based on a corroded high doping optical fiber. The preparation method comprises the following steps: soaking the end face of the high doping optical fiber into a corrosive liquor for corrosion so as to form micropores on the end face; and welding the micropores of two corroded optical fiber oppositely, or welding the micropores of one corroded optical fiber with the end face of a monomode optical fiber to form the optical fabry-perot sensor. A mixed liquor of hydrofluoric acid and strong inorganic acid is taken as the corrosive liquor; the used optical fiber is a fiber core high doping optical fiber; the high doping concentration further increases the corrosion rate difference between a cladding and the fiber core; the strong inorganic acid in the corrosive liquor reduces the concentration of the hydrofluoric acid, reduces the corrosion rate of the corrosive liquor on the cladding, reduces the corrosion of the cladding while simultaneously improving the corrosion depth of the fiber core, and consequently greatly improves the mechanical properties of the welded fabry-perot sensor.

Description

Technical field [0001] The invention relates to an optical fiber sensor, in particular to a method for manufacturing a Fabry Perot sensor based on corrosion of a highly doped optical fiber. Background technique [0002] Optical fiber Fabry Perot sensors have been widely used in the sensing of strain, pressure, temperature, refractive index and other parameters in many fields such as industry and military. They are divided into intrinsic and extrinsic Fabry Perot sensors. The extrinsic optical fiber Fabry Perot sensor (EFPI) refers to the Fabry Perot cavity formed by the optical fiber end face and the air interface as the reflecting surface, which has the sensing characteristics of being sensitive to a certain physical or chemical parameter. The traditional EFPI sensor mainly fusion-splices a hollow fiber, a hollow capillary, or a hollow photonic crystal fiber between two single-mode fibers, or directly uses a hollow sleeve to align and fix the two single-mode fibers. The EFPI sen...

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Application Information

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IPC IPC(8): G01D5/26
Inventor 龚元饶云江郭宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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