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Optical fiber temperature sensor

A temperature sensor and optical fiber technology, applied in thermometers, thermometers with physical/chemical changes, instruments, etc., can solve the problems of insulated stress, etc., and achieve the effects of simple structure, increased service life, and improved sensitivity

Active Publication Date: 2013-06-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

In the actual use process, the fiber grating has a relatively good response to temperature, stress and strain, so it is impossible to isolate the stress without other protective measures.

Method used

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  • Optical fiber temperature sensor
  • Optical fiber temperature sensor

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Embodiment Construction

[0016] see Figure 1-Figure 3 , an embodiment of the present invention provides an optical fiber temperature sensor, including a broadband light source 7, a first single-mode optical fiber 1, a second single-mode optical fiber 5, a multi-core optical fiber 3 and an optical analysis device (a spectrometer 8 is used in this embodiment) . The broadband light source 7 is connected to an optical analysis device (a spectrometer 8 in this embodiment) through the first single-mode optical fiber 1 , the multi-core optical fiber 3 and the second single-mode optical fiber 5 in sequence. The joints of the first single-mode optical fiber 1, the second single-mode optical fiber 5 and the multi-core optical fiber 3 are all collapsed structures formed by arc discharge with approximately uniform distribution of the optical fiber refractive index profile. The collapsed structure here refers to the destruction of the step optical fiber The well-defined structure of the core and cladding refract...

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Abstract

The invention relates to the technical field of optical fiber sensors, in particular to an optical fiber temperature sensor which comprises a broadband light source, a first single-mode fiber, a second single-mode fiber and a multi-core fiber. The broadband light source is connected with the second single-mode fiber sequentially through the first single-mode fiber and the multi-core fiber. The connections on the first single-mode fiber, the second single-mode fiber and the multi-core fiber are all of recess structures formed by arc discharge. The optical fiber temperature sensor is high in temperature sensitivity, low in stress-temperature cross sensitivity and widely applicable to high-precision temperature measurementunder stress interference.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensors, in particular to an optical fiber temperature sensor. Background technique [0002] Optical fiber temperature sensors can be divided into many types according to their working principles, such as interference-based sensors, grating-based sensors, distributed sensors based on Raman or Brillouin scattering, etc. Generally speaking, dot-matrix or quasi-distributed sensors are often used for short-distance and small-scale temperature measurement. However, the optical fiber is very sensitive to multiple parameters of the external environment (such as temperature, stress, vibration, environmental refractive index, etc.), which leads to the common cross-sensitivity problem in the current optical fiber sensor, which leads to the decrease of the measurement accuracy of the optical fiber sensor, transmission Reliability drops. At present, there are very few studies on stress-insensitive tem...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01K11/3206
Inventor 唐明赵志勇杨芳韦会峰童维军付松年沈平
Owner HUAZHONG UNIV OF SCI & TECH
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