Photonic crystal fiber temperature sensing probe and measuring system thereof

Abstract

The invention discloses a photonic crystal fiber temperature sensing probe and a measuring system thereof, relating to the field of photonic crystal fiber temperature sensing devices. The photonic crystal fiber temperature sensing probe comprises an LMA-8 total internal reflection type photonic crystal fiber, the back end face of which is plated with a silver membrane, wherein a coating layer of the photonic crystal fiber is internally filled with temperature-sensitive mixed solution of chloroform, toluene and ethanol; the temperature-sensitive coefficients of the chloroform, the toluene and the ethanol are respectively -6.328*10<-4> / K, -5.273*10<-4> / K and -3.940*10<-4> / K, which are two order of magnitudes than that of pure quartz. Only once welding is needed for the manufacturing of the reflection type fiber probe, so that welding consumption is reduced, the manufacturing process is simplified; meanwhile, as a sensing light signal after being reflected twice passes through a temperature sensing region, effects of actions are enhanced, sensing sensitivity is improved; and in addition, as the mixed solution of toluene and the ethanol with a very low melting point is utilized, a temperature sensing probe device used in an ultralow temperature environment can be produced by adjusting the proportion of the solution appropriately.

Description

technical field [0001] The invention relates to the field of photonic crystal fiber sensor devices, in particular to a photonic crystal fiber temperature sensing probe and a measurement system thereof. Background technique [0002] Sensor technology, communication technology and computer technology are called the three pillars of today's information industry. Since the 1980s, the advent of low-loss optical fibers has set off a revolution in the field of sensors. The refractive index difference between the fiber core and the cladding can effectively control the numerical aperture and loss characteristics. When the effective refractive index of the cladding is modulated by the ambient temperature, the light guiding characteristics of the fiber will change, so that the optical signal intensity can be measured The change of the external temperature can effectively obtain the information of the external temperature. [0003] The flexible air hole structure of photonic crystal f...

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Problems solved by technology

[0005] The scheme in the prior art belongs to the transmissive sensing, which has the disadvantages of complex optical path, multiple fusion splicing of photonic crystal fiber and ordinary single-mode fiber, separation of light source and detection device on both sides of the sensing unit, etc., especially unsuitable for extreme engineering. Field testing in harsh environments

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