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Transmission-type optical fiber liquid level sensor with irregular core structure

A liquid level sensor, transmissive technology, applied in liquid level indicators, instruments, machines/engines, etc., can solve problems such as being easily affected by temperature, and achieve the effects of convenient preparation, high sensitivity and simple structure

Inactive Publication Date: 2013-07-10
CHINA JILIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The disadvantage is that the length of multimode or coreless fiber needs to be precisely controlled and is easily affected by temperature

Method used

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  • Transmission-type optical fiber liquid level sensor with irregular core structure
  • Transmission-type optical fiber liquid level sensor with irregular core structure

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Embodiment Construction

[0025] The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.

[0026] figure 1 It is a structural schematic diagram of the present invention for a transmissive optical fiber liquid level sensor with a different core structure. This embodiment includes: a broadband light source 1, a common single-mode optical fiber 2, a thin-core single-mode optical fiber 3, and an optical fiber spectrum analyzer 4, wherein: a broadband light source The continuous spectrum light of 1400-1700nm generated by 1 is coupled into the ordinary single-mode fiber 2, the middle of the ordinary single-mode fiber 2 is cut off and a certain length of thin-core single-mode fiber 3 is fused, and the light is coupled to the thin-core single-mode fiber 3 to form The interference of light, the coherent light is coupled into the ordinary single-mode fiber 2 and transmitted to the fiber optic spectrum ...

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Abstract

The invention discloses a transmission-type optical fiber liquid level sensor with an irregular core structure. The transmission-type optical fiber liquid level sensor comprises a wideband light source, a sensing head and an optical fiber spectrum analyzer, wherein the sensing head is formed by welding a section thin core single mode fiber onto the middle of common single mode fiber, during measurement, one part of the thin core single mode fiber is positioned on a liquid level, and the other part of the thin core single mode fiber is positioned below liquid level. The common single mode fiber receives light coming from a wideband light source and is coupled to the thin core single mode fiber, so that the light is transmitted inside the thin core single mode fiber in a form of a mandrel and a cladding mode so a to form an interferometer similar to Mach-Zehnder interferometer. Light of the two parts interferes mutually and then is coupled into the common single mode fiber again and finally led into an optical fiber spectrum analyzer. By measuring drift amount of wave length of the characteristic peak in transmitted spectrum, the liquid-level variation can be calculated. The transmission-type optical fiber liquid level sensor has a compact structure, has the benefits of simplicity in preparation, high measuring accuracy, wide measuring range, safety, explosion protection and the like, and is particularly suitable for precision measurement to liquid level of inflammable liquid.

Description

technical field [0001] The invention relates to a transmissive optical fiber liquid level sensor, in particular to fusion splicing of different-core optical fibers, so that the core mode and the cladding mode in the optical fiber interfere to form a Mach-Zehnder interferometer, by measuring the shift of the characteristic peak wavelength in the transmission spectrum Measure the amount of change in the liquid level. It is mainly used in occasions where the measurement of liquid level changes is small and the accuracy is high, especially suitable for the measurement of flammable liquids, such as fuel oil, etc. Background technique [0002] In petroleum, chemical, electric power, metallurgy, national defense and military departments, various types of storage tanks must be used for production or storage to store various flammable and explosive oils or chemical liquid raw materials, and to detect the liquid level of these storage tanks , not only requires the detector to have hi...

Claims

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Application Information

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IPC IPC(8): G01F23/292
Inventor 徐贲李裔杨凯董新永孙苗赵晓伟
Owner CHINA JILIANG UNIV
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