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Fiber temperature sensor and measuring system thereof and signal processing method of system

A fiber optic temperature and measurement system technology, applied to thermometers, heat measurement, and measurement devices, can solve problems such as measurement temperature defects, improve measurement sensitivity, and eliminate errors

Active Publication Date: 2012-04-11
SHENZHEN UNIV
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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an optical fiber temperature sensor, a measurement system and a signal processing method, aiming at solving the measurement temperature defect problem existing in the existing fluorescent optical fiber temperature sensor

Method used

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  • Fiber temperature sensor and measuring system thereof and signal processing method of system
  • Fiber temperature sensor and measuring system thereof and signal processing method of system
  • Fiber temperature sensor and measuring system thereof and signal processing method of system

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Embodiment

[0046] After filling the pores of photonic crystal fiber with rhodamine B as a fluorescent substance and ethanol solution as a temperature-sensitive material for refractive index, the characteristics of the excitation light and fluorescence in the fiber with temperature were detected. The temperature coefficient of the refractive index of ethanol is 3.94×10 -4 / K, relative to pure silicon refractive index temperature coefficient 8.6×10 -6 / K is about two orders of magnitude higher. The ratio of the fluorescent material rhodamine B to the refractive index temperature-sensitive material alcohol is 1:5. If there is too much rhodamine B, the fluorescence will be saturated. If there is too little rhodamine B, the fluorescence signal will be weak, which will bring difficulties to the detector measurement.

[0047] The photonic crystal fiber selects a photonic bandgap fiber with a core hole diameter of 5.6 μm, a cladding air hole diameter of 2.2 μm, and a duty cycle of about 85%. ...

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Abstract

The invention discloses a fiber temperature sensor and a measuring system thereof and a signal processing method of the system. The fiber temperature sensor is composed of a normal fiber and a photonic crystal fiber. Two ends of the photonic crystal fiber are welded with the normal fiber, so that a fiber temperature sensor is formed. Pores of the photonic crystal fiber are filled with fluorescent substances and refractive index temperature sensitive substances. The normal fiber is a multi-mode fiber or a single-mode fiber. And the fiber temperature sensor measuring system comprises a light source, the fiber temperature sensor, a coupler, a filter, a detector and a signal processing unit. When a signal is processed, an exciting light and a fluorescent light are used as temperature measurement parameters, wherein the exciting light and the fluorescent light are output by the sensor, and an intensity ratio of the exciting light to the fluorescent light is also used as a temperature measurement parameter, so that a multi-parameter measurement temperature is formed; and therefore, sensitivity and measurement precision of the fiber temperature sensor are improved.

Description

technical field [0001] The invention relates to a temperature sensor, in particular to an optical fiber temperature sensor based on a photonic crystal optical fiber, a measurement system and a signal processing method. Background technique [0002] Temperature is the most commonly used physical indicator in industrial production and life, and temperature sensors have a wide range of applications. In recent years, due to the advantages of large dynamic range, intrinsic safety and anti-electromagnetic interference, fiber optic temperature sensors have attracted more and more attention. Optical fiber fluorescence temperature sensor is an important branch of optical fiber temperature sensor. [0003] The traditional fluorescent optical fiber temperature sensor measures temperature by using the characteristics that the fluorescence intensity of fluorescent materials changes with temperature, or the decay rate of fluorescence intensity changes with temperature. The earliest fluo...

Claims

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Application Information

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IPC IPC(8): G01K11/32
Inventor 李学金洪学明
Owner SHENZHEN UNIV
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