Concentration tunable mixing liquid core optical fiber temperature sensor

Abstract

The invention discloses a mixed liquid core optical fiber temperature sensor with turnable consistency, comprising a light source outputting device, a transmission device, a temperature testing device and a receiving detection device. The temperature testing device internally comprises a temperature testing chamber and a mixed liquid core optical fiber. The light source output device, the mixed liquid core optical fiber and the receiving detection device are connected with each other by a transmission device; the mixed liquid core optical fiber suspends inside the temperature testing chamber. The mixed liquid core optical fiber is composed of a hollow silicon dioxide optical fiber filled with mixed liquid. The composition of the adopted mixed liquid is toluene and chloroform inhalator; the volume content of the toluene ranges from 30% to 40%. In the working range, the mixed liquid core optical fiber temperature sensor has extremely high sensitiveness of 5dB / K, and has the adjusting range of 20 DEG C to 60 DEG C which covers almost all range of normal temperatures. The mixed liquid core optical fiber temperature sensor is suitable for temperature measurement of small range and high precision or distinguishing of precise temperature in normal temperature range, and has simple structure and easy integration.

Description

technical field [0001] The invention relates to a temperature sensor in the field of measurement technology, in particular to a mixed liquid core optical fiber temperature sensor with tunable concentration. Background technique [0002] In recent decades, fiber optic sensors have been applied in many sensing fields because of their characteristics of easy integration and strong anti-interference, and have played a huge role. Since the concept of fiber optic sensors was first proposed in 1967, fiber optic sensors have been widely used in displacement sensing, mechanical sensing, optical sensing, and temperature sensing. In 1972, for the first time, someone injected liquid into the hollow fiber to make a hybrid liquid core fiber, and began to study its properties and applications. The high sensitivity of liquid to many physical quantities makes the hybrid liquid core fiber be applied to the sensing field very quickly. [0003] Find through literature retrieval to prior art, ...

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Problems solved by technology

[0003] Find through literature retrieval to prior art, " Liquid core optical fiber temperature sensors " that Marten de Vries etc. published on " IEEE Region 3 Technical Conference " (Institute of Electrical and Electronics Engineers 3 District Conference Proceedings) 1991, (mixed liquid core fiber temperature sensor), this paper puts forward the concept of hybrid liquid core fiber temperature sensor for the first time, and uses the characteristics of the refractive index difference of the fiber core diameter and cladding to change with temperature for temperature sensing. The disadvantage is that: due to the The liquid composition used is single. Although the measurement range is from 20°C to 185°C, its sensitivity is only 0.007dB / K, which is difficult to meet the high-precision temperature measurement requirements in the room temperature range, and it is difficult to have too many in real life. application

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