Liquid level sensor prepared based on plastic optical fiber macro-bending method

A technology of liquid level sensor and light modeling, which is applied in the direction of liquid level indicators, instruments, mechanical equipment, etc., can solve the problems of temperature, electromagnetic, liquid type pollutants, unsuitable vibration environment, expensive instruments and equipment, etc., to achieve Excellent processability and insulation, light weight and low price

Pending Publication Date: 2022-01-21
NANCHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a liquid level sensor prepared based on plastic optical fiber macro-bending method, so as to solve the problem that the above-mentioned existing liquid level sensor is easily affected by temperature, electromagnetic, liquid type and pollutants, and it is dangerous to monitor flammable liquids. , not suitable for vibrating environments, the range is small, the detection requires complex methods and expensive instruments and equipment, etc.

Method used

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  • Liquid level sensor prepared based on plastic optical fiber macro-bending method
  • Liquid level sensor prepared based on plastic optical fiber macro-bending method
  • Liquid level sensor prepared based on plastic optical fiber macro-bending method

Examples

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Effect test

Embodiment 1

[0040] The cylinder used in the embodiment is a square cylinder with rounded corners, the height of the cylinder is 100mm, the length of the straight section of the bottom surface is 4mm, and the bending radius is 2mm; the POF used is d500 produced by Jiangxi Dasheng Plastic Optical Fiber Co., Ltd.;

[0041] The core material of the d500 is PMMA, the cladding material is fluororesin, the refractive indices of the core and the cladding are 1.49 and 1.41 respectively, the core diameter is 480 μm, and the cladding thickness is 10 μm.

[0042] A liquid level sensor prepared based on plastic optical fiber macro-bending method, the specific steps are as follows:

[0043] Select a plastic optical fiber with a diameter of 1 m and a diameter of 500 μm, and polish the surfaces at both ends to ensure the parallelism and flatness of the upper and lower surfaces, such as figure 1 As shown; put the polished fiber end face into a beaker filled with alcohol, ultrasonically clean it and then d...

Embodiment 2

[0047] The difference from Example 1 is that in Example 2, the sensor after standing for 48 hours is placed in a water bath and heated at a constant temperature of 50°C for 12 hours to eliminate the internal stress when the optical fiber is wound, and the other conditions are the same as in Example 1. . Compared with Example 1, the sensitivity of the sensor is slightly reduced, but the repeatability and reliability of the sensor are greatly improved, as Figure 5 shown. The response time of each group was less than 100ms.

Embodiment 3

[0049] The difference from Example 1 is that plastic optical fibers with diameters of 250 μm (POF #1) and 1 mm (POF #2) are selected to build liquid level sensor experimental platforms, and other conditions are the same as in Example 1. Compared with Example 1, the liquid level sensor built with POF#1 has low sensitivity and cannot respond sensitively to changes in the liquid level; the liquid level sensor built with POF#2 has too large a POF size, and POF is not in contact with the surface of the cylinder. Completely, the sensor preparation is difficult, and the repeatability of liquid level monitoring is poor.

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Abstract

The invention discloses a liquid level sensor prepared based on a plastic optical fiber macro-bending method, and relates to the field of plastic optical fibers and the technical field of liquid level sensing. The liquid level sensor is obtained by winding POF on the surface of a cylinder, and the cylinder is made of light modeling resin. The preparation method comprises the following steps: (1) preprocessing the POF end face to obtain a flat optical fiber end face; and (2) winding the POF on the surface of the cylinder according to a preset track, and fixing the POF through an adhesive. The method is simple to operate and high in measurement precision, and can adapt to the requirements of different resolutions by controlling the distance of each circle of optical fiber; the POF liquid level sensor has excellent electronic insulation and remote sensing performance, can perform safe measurement on flammable and explosive oil tanks, realizes point liquid level monitoring, and has the advantages of high sensitivity, quick response, electromagnetic interference resistance, small volume, light weight, corrosion resistance and the like.

Description

technical field [0001] The invention relates to the field of plastic optical fiber and the technical field of liquid level sensing, in particular to a liquid level sensor prepared based on a plastic optical fiber macro-bending method. Background technique [0002] Liquid level measurement is of great significance in both chemical and fuel storage fields. For example, in aircraft fuel systems, more effective loads, longer voyages and safer flights all rely on high-precision fuel level measurement technology. According to the sensor principle, it can be divided into capacitive sensors, ultrasonic sensors, radar sensors, float sensors, and optical fiber sensors. [0003] Among them, capacitive liquid level sensors are the most widely used, such as patent CN213576677U, which discloses a technology: by designing brackets, support blocks, connecting rods and return springs, etc., it solves the inconvenient height adjustment of existing capacitive liquid level sensors and the incon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/292
CPCG01F23/292
Inventor 李玉龙廖开宇李学文雷敏王文琴胡小武张超华
Owner NANCHANG UNIV
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