A kind of FPI cascaded optical fiber humidity sensor based on GQDS-PVA filling and preparation method

A technology of humidity sensor and optical fiber, which is applied in the field of GQDs-PVA-filled FPI cascaded optical fiber humidity sensor and its preparation, which can solve the problems of sensitive material falling off, affecting the sensor's sensing performance, reducing the service life of the sensor, etc., and achieving high sensitivity , low cost and wide measurement range

Active Publication Date: 2020-03-24
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

During long-term use, this method of coating sensitive materials on the end face or side of the optical fiber will easily cause the sensitive materials to fall off, thereby affecting the sensing performance of the sensor and reducing the service life of the sensor

Method used

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  • A kind of FPI cascaded optical fiber humidity sensor based on GQDS-PVA filling and preparation method
  • A kind of FPI cascaded optical fiber humidity sensor based on GQDS-PVA filling and preparation method
  • A kind of FPI cascaded optical fiber humidity sensor based on GQDS-PVA filling and preparation method

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Embodiment Construction

[0023] The technical solutions of the present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0024] Step 1: Preparation of GQDs-PVA mixture, the specific process is as follows: Weigh 1.45mL of GQDs with a concentration of 1mg / mL and 2.9mg of PVA, and place them in the same beaker; then place the small beaker on a magnetic stirrer , adjust the stirring speed to 3000rad / min, fully stir at a temperature of 30°C, and place it for later use.

[0025] Step 2: Preparation of FPI cascaded optical fiber humidity sensing structure. In this example, the length of the photonic crystal fiber is 281.43 μm, and the length of the hollow core fiber is 490.83 μm. The specific manufacturing process is as follows: a section of single-mode fiber and photonic crystal fiber Place one end in the fiber fusion splicer respectively, adjust the discharge intensity of the fiber fusion splicer to 60-80, and the advancing distance to 0...

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Abstract

The invention provides an FPI (Fuel Pressure Indicator) cascaded optical fiber humidity sensor based on GQDs-PVA (Graphene Quantum Dots-Polyvinyl Acetate) filling and a preparation method. The FPI cascaded optical fiber humidity sensor is composed of a single-mode optical fiber, a photonic crystal optical fiber, a hollow-core optical fiber and a GQDs-PVA mixture, wherein the GQDs-PVA mixture is filled into the hollow-core optical fiber and the length of the photonic crystal optical fiber is aum; the length of a part which is not filled with the GQDs-PVA mixture of the hollow-core optical fiberis bum; the ratio of a to b is greater than 0.5 and less than or equal to 1; therefore, an FPI cascaded sensing structure is formed. The other end of the single-mode optical fiber is connected with an optical fiber circulator; the other two ends of the circulator are connected with a broadband optical source and a spectrograph respectively. The FPI cascaded optical fiber humidity sensor based onthe GQDs-PVA filling, provided by the invention, has a reflection type structure, and has the advantages that the structure is simple, the cost of the sensor is low, a sensitive material does not easily fall off, the sensitivity is high, a measurement range is wide and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber humidity sensing, and in particular relates to a GQDs-PVA-filled FPI cascaded optical fiber humidity sensor and a preparation method. Background technique [0002] In the fields of agriculture, pharmacy and medicine, the detection of humidity value seriously affects the yield of agricultural products and the efficacy of pharmaceutical products. Therefore, it is an urgent problem to realize the accurate measurement of humidity. Compared with traditional electrochemical humidity sensors, optical fiber humidity sensors avoid complex mechanical mechanisms and do not rely on semiconductor materials, so they have the advantages of small size, anti-electromagnetic interference, and long service life. Among them, the current optical fiber humidity sensor mainly coats the humidity sensitive material on the side or end face of the optical fiber. When the humidity value changes, the volume or refracti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41
CPCG01N21/41
Inventor 赵勇仝锐杰
Owner NORTHEASTERN UNIV LIAONING
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