U-shaped plastic optical fiber liquid refractive index sensor with multi-groove structure

Abstract

The invention relates to a U-shaped plastic optical fiber liquid refractive index sensor with a multi-groove structure, and belongs to the technical field of optical fiber sensors. The U-shaped plastic optical fiber liquid refractive index sensor consists of a light source, a U-shaped plastic optical fiber probe with a multi-groove structure, and a photoelectric detection device. The U-shaped plastic optical fiber probe with the multi-groove structure is characterized in that a plastic optical fiber is vertically arranged at the lower surface of a steel die of which the surface provided with a cross section of a triangular sawtooth structure, and the vertexes of a triangle point to a center line of the plastic optical fiber; the pressure is applied to the steel die by a clamp, and the multi-groove structure with multiple V-shaped grooves is pressed along a fiber core of a centerline cross section of the plastic optical fiber by the triangular sawtooth structure of the die; then, the plastic optical fiber and the opposite other side surface of the multi-groove structure are wound on a cylindrical steel cylinder which is heated to about 75 to 95 DEG C; finally, about 3 to 6N tension is applied to both ends of the optical fiber. The U-shaped plastic optical fiber liquid refractive index sensor has the characteristics that the structure and preparation technology are simple, the cost is low, and the sensitivity is high.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a U-shaped plastic optical fiber liquid refractive index sensor with a multi-groove structure. Background technique [0002] Refractive index is an important optical parameter of matter, and its measurement is of great significance in the fields of food, environment, pharmacy and biochemistry. Important parameters such as liquid concentration can also be obtained by measuring the refractive index of the liquid. In recent years, the use of optical fiber sensing technology to measure the refractive index of liquid has been more and more researched and applied. It has the advantages of anti-electromagnetic interference, insulation, corrosion resistance, remote work and distributed sensing. [0003] At present, the existing optical fiber liquid refractive index sensors generally use fiber gratings. For example, the Chinese invention patent "A Micro-nano Fib...

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Problems solved by technology

However, the production of this interferometer also requires the use of carbon dioxide lasers or fusion splicers, and the process is relatively complicated, and the price of the photonic crystal fiber used is also relatively expensive.

And the optical fiber refractive index sensor with the above structure needs to use a spectrometer to measure the signal, thus increasing the cost of testing

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