Optical fiber temperature sensor

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...

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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.

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