CN107063393A - 一种基于单模‑多模‑单模光纤结构和布拉格光栅的液位传感器系统 - Google Patents

一种基于单模‑多模‑单模光纤结构和布拉格光栅的液位传感器系统 Download PDF

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CN107063393A
CN107063393A CN201710163662.4A CN201710163662A CN107063393A CN 107063393 A CN107063393 A CN 107063393A CN 201710163662 A CN201710163662 A CN 201710163662A CN 107063393 A CN107063393 A CN 107063393A
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张艳
韩佳晖
梁家理
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China Jiliang University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/292—Light, e.g. infrared or ultraviolet
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
    • G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
    • G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
    • G01D5/35374—Particular layout of the fiber
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
    • G01D5/3538—Optical fibre sensor using a particular arrangement of the optical fibre itself using a particular type of fiber, e.g. fibre with several cores, PANDA fiber, fiber with an elliptic core or the like

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
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Abstract

一种基于单模‑多模‑单模光纤结构和布拉格光栅的液位传感器系统，包括电动线性台、温控台、水容器、光纤组、环形器、宽带光源以及光谱仪，其中光纤组由第一单模光纤、第二单模光纤、多模光纤以及刻于第二单模光纤上的布拉格光栅组成，以第一单模光纤‑多模光纤‑第二单模光纤的方式在竖直方向上固定，所述的光纤组浸入水容器中，同时通过支架将电动线性台与光纤组相连，水容器置于温控台上，所述的光纤组与环形器相连，环形器与宽带光源以及光谱仪按顺时针方向进行连接。本发明通过将布拉格光栅中心波长定位在传感器边缘滤波器光谱区域，确定布拉格光栅反射光谱图来实现液位的测量，可操作性强，灵敏度高，结构简单，损耗小。

Description

一种基于单模-多模-单模光纤结构和布拉格光栅的液位传感 器系统
技术领域
本发明涉及一种液位传感器，特别是涉及一种基于单模-多模-单模光纤结构和布拉格光栅的液位传感器系统，属于光纤传感技术领域。
背景技术
现如今，在燃料储存、液体定量和定性监测以及化学处理等许多应用中液位感测变得越发重要，人们可以使用各种传统的机械或电气方法来检测液位，包括浮子、超声波、磁致伸缩、压差和电容方法等。但以上方法存在几个缺点，如高维护成本，易受电磁干扰，结构复杂和低分辨率等，同时如果待测量的液体是导电的、有侵蚀作用的甚至是潜在爆炸性的，则其应用有可能受损。
为解决以上这些问题，由电介质制成且不导电的、不能被大多数液体侵蚀的光纤传感器出现了，光纤传感器能够提供多路复用能力，并具有紧凑的尺寸，高分辨率和对电磁干扰的抗扰性多个优点，而基于多模干涉的单模-多模-单模光纤结构中多模光纤对外部折射率敏感，单模-多模-单模光纤光谱响应将相对于浸没在液体中的多模光纤长度而移动，当单模-多模-单模光纤结构型光纤传感器置于外界环境时，随着环境的变化其结构中间部分会受到调制，此传感结构具有光谱滤波功能和传感特性，有成本低、耐腐蚀、易于加工等诸多优点，在光纤通信和光纤传感领域得到了广泛的研究和应用。
专利CN 203981244 U公开了一种基于细芯倾斜光纤光栅的液位传感器，该装置能够通过对细芯倾斜光纤光栅反射光谱图的变化实现对液位变化量的精确测量，但其所测量的液体材料受温度所限，针对部分不能够在常温下测量的液体有一定的局限性，且并未采取纤芯错位对接的方法来获得光栅反射谱，故导致包层模反射谱不易被获得。此外，本传感器系统在温控台对液体温度改变时，通过光谱仪测得的波长变化量能够直接计算得到温度的变化量，易于操作，结构简单。
发明内容
为了解决现有技术的不足，本发明提供一种基于单模-多模-单模光纤结构和布拉格光栅的液位传感器系统，该装置通过将布拉格光栅中心波长定位在光纤组边缘滤波器光谱区域处，从而确定布拉格光栅反射光谱图来实现液位的测量，具有易于操作，灵敏度高，结构简单以及损耗小等特点。
本发明解决技术问题所采用的技术方案为：
一种基于单模-多模-单模光纤结构和布拉格光栅的液位传感器系统，其特征在于，包括电动线性台(1)、温控台(2)、水容器(3)、光纤组(4)，其中光纤组(4)由第一单模光纤(5)、第二单模光纤(6)、多模光纤(7)以及刻于第二单模光纤(6)上的布拉格光栅(8)组成，以第一单模光纤(5)-多模光纤(7)-第二单模光纤(6)的方式在竖直方向上连接，所述的光纤组(4)浸入水容器(3)中，同时通过支架将电动线性台(1)与光纤组(4)相连，水容器(3)置于温控台(2)上，所述的光纤组(4)与环形器(9)相连，环形器(9)分别与光谱仪(10)以及宽带光源(11)连接进行处理。
所述的布拉格光栅(8)的长度为3毫米。
所述的多模光纤(7)是一个直径为125微米，长度为58.2毫米的纯硅棒，夹在两根单模光纤，即第一单模光纤(5)与第二单模光纤(6)之间，两单模光纤的长度均为60毫米，包层直径为125微米，纤芯直径2.5微米。
附图说明
下面结合附图及具体方式对本发明作进一步说明。
图1是本发明一种基于单模-多模-单模光纤结构和布拉格光栅的液位传感器系统结构示意图。
图2是本发明一种基于单模-多模-单模光纤结构和布拉格光栅的液位传感器系统中光纤组结构示意图。
图中，1为电动线性台；2为温控台；3为水容器；4为光纤组；5为第一单模光纤；6为第二单模光纤；7为多模光纤；8为布拉格光栅；9为环形器；10为光谱仪；11为宽带光源。
具体实施方式
图1中，本发明一种基于单模-多模-单模光纤结构和布拉格光栅的液位传感器系统包括电动线性台1、温控台2、水容器3、光纤组4，所述的光纤组4浸入水容器3中，同时通过支架将电动线性台1与光纤组4相连，水容器3置于温控台2上，所述的光纤组4与环形器9相连，环形器9与光谱仪10以及宽带光源11以顺时针方向进行连接。
图2中，本发明一种基于单模-多模-单模光纤结构和布拉格光栅的液位传感器系统中光纤组4结构由第一单模光纤5、第二单模光纤6、多模光纤7以及刻于第二单模光纤6上的布拉格光栅8组成，以第一单模光纤5-多模光纤7-第二单模光纤6的方式在竖直方向上连接，下方作为传输出口，上方为反射出入口。

Claims (3)

1.一种基于单模-多模-单模光纤结构和光纤布拉格光栅的液位传感器系统，其特征在于，包括电动线性台、温控台、水容器、光纤组、宽带光源以及光谱仪，其中光纤组由第一单模光纤、第二单模光纤、多模光纤以及刻于第二单模光纤上的布拉格光栅组成，以第一单模光纤-多模光纤-第二单模光纤的方式在竖直方向上连接，所述的光纤组浸入水容器中，同时通过支架将电动线性台与光纤组相连，水容器置于温控台上，所述的光纤组与环形器相连，环形器与宽带光源以及光谱仪按顺时针方向进行连接。
2.根据权利要求1所述的一种基于单模-多模-单模光纤结构和光纤布拉格光栅的液位传感器系统，其特征在于：所述的布拉格光栅的长度为3毫米。
3.根据权利要求1所述的一种基于单模-多模-单模光纤结构和光纤布拉格光栅的液位传感器系统，其特征在于：所述的多模光纤是一个直径为125微米，长度为58.2毫米的纯硅棒，夹在两根单模光纤，即第一单模光纤与第二单模光纤之间，两单模光纤的长度均为60毫米，包层直径为125微米，纤芯直径2.5微米。
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CN112945805A (zh) * 2021-01-28 2021-06-11 哈尔滨工程大学 一种微结构光纤光栅串联装置及液体密度测量方法
CN114135420A (zh) * 2021-11-10 2022-03-04 江西洪都航空工业集团有限责任公司 一种固体冲压发动机大流量调节比装置和飞行器
CN114135420B (zh) * 2021-11-10 2023-12-19 江西洪都航空工业集团有限责任公司 一种固体冲压发动机大流量调节比装置和飞行器

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Application publication date: 20170818