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基于光纤准直器的反射式盐度传感器

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设计了一种新颖的光学盐度传感器,该传感器采用基于光纤准直器结合双通道反射原理而设计,特别适用于长距离的盐度值测量(盐度值在设计中用不同浓度的氯化钠溶液表示)。为了验证该传感器的性能,设计并实施了一个对比实验。实验系统是基于菲涅耳反射原理的双通道系统,一路通道接测量传感器,另外一路通道接普通的带保护层的光纤端子。主要创新点和先进性是:普通的光纤准直器可直接用作盐度值测量传感器,尤其是实验表明该传感器的信噪比至少比普通光纤头式传感器高6.11 dB,等价测量距离至少延长了30 km。实验同时表明温度的影响值为0.005 16 dB/℃,温度对测量值影响很小,而且该传感器系统还可以有效消除光源和外界环境带来的干扰。


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第
卷第  
期
年 月  
7
47  
7
红外与激光工程  
Infrared and Laser Engineering  
ꢀꢁ18  
Vol.47 No.7  
Julꢂ ꢀꢃ18  
Salinity sensor based on the back reflection on a fiber collimator  
1,2 2 1 1,3  
Xiao Dongrui , Huang Xuguang , Yao Shengxing , Li Zulin , Hong Jun  
1
ꢇ1. Key Laboratory of Photoelectric Information Processing and Detecting, Hunan Institute of Technology, Hengyang 4ꢀ1ꢃꢃꢀ, China;  
；
ꢀ. Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou 5ꢅꢃꢃꢃ6, China  
3ꢂ Key Laboratory of Signal Processing, Hunan Institute of Technology, Hengyang 42ꢅꢃꢃ2, Chinaꢆ  
Abstract: A new optical salinity sensor was proposed, which was designed by an optical collimator,  
based on a two -channel back reflection technique, and especially suitable for the long distance  
measurement of salinity ꢇsalinity was demonstrated by different concentrations of sodium chloride in de-  
ionized waterꢆꢂ To demonstrate the performance of this new sensor, a comparative experiment was  
conductedꢂ The experimental system was based on the structure of two Fresnel-back-reflection channels,  
one of which was designed with the measuring sensor, and the other was a fiber end with protective  
claddingꢂ The main innovation and advantages of this sensor were that the common collimator could be  
directly used as a salinity sensorꢂ Especially, the experimental results showed the signal to noise ratio  
ꢇSNRꢆ of this measuring method by using the collimator -sensor was at least 6ꢂ11 dB more than the  
common method by using fiber-sensor and the equivalent extended measurement distance of the system  
was at least extended by 30 kmꢂ The experimental results also show the temperature influence was  
estimated to be 0ꢂ005 16 dB/℃, which meant the temperature has little influence on the measurement, and  
also the influences resulted from fluctuation of light source and environment can be effectively eliminatedꢂ  
Key words: salinity sensor;  
fiber collimator;  
relative reflection intensity  
：
DOI ꢅꢃꢂ3788/IRLA2ꢃꢅ847ꢂꢃ72ꢃꢃꢃ4  
CLC number: O433 Document code: A  
基于光纤准直器的反射式盐度传感器  
ꢅ,2 2 ꢅ ꢅ,3  
肖冬瑞 , 黄旭光 , 姚胜兴 , 李祖林 , 洪  
ꢅ
俊
ꢇꢅꢂ 湖南工学院 光电信息处理与检测重点实验室, 湖南 衡阳 42ꢅꢃꢃ2;  
2ꢂ 华南师范大学 纳米光子功能材料与设备的实验室, 广东 广州 5ꢅꢃꢃꢃ6；  
3ꢂ 湖南工学院 信号处理重点实验室, 湖南 衡阳 42ꢅꢃꢃ2ꢆ  
摘
要：  
设计了一种新颖的光学盐度传感器，该传感器采用基于光纤准直器结合双通道反射原理而设计，  
特别适用于长距离的盐度值测量（盐度值在设计中用不同浓度的氯化钠溶液表示）。为了验证该传感器的  
性能，设计并实施了一个对比实验。实验系统是基于菲涅耳反射原理的双通道系统，一路通道接测量传感  
器，另外一路通道接普通的带保护层的光纤端子。主要创新点和先进性是：普通的光纤准直器可直接用作  
盐度值测量传感器，尤其是实验表明该传感器的信噪比至少比普通光纤头式传感器高 6ꢂꢅꢅ dB，等价测量  
收稿日 期：  
；
修 订日 期：  
ꢀꢃ18ꢄ0ꢀ-10  
ꢀ018-03-ꢀ0  
基金项 目：国 家科 技支撑 计划  
(2ꢁꢅꢅBAFꢁ6B0ꢀ)  
作者简 介：肖 冬瑞  
，男，讲师 ，硕士 ，主要 从事 光纤传 感器 方面 的研 究 。  
(ꢅ984ꢄꢆ  
Email:donread@ꢅ63.com  
0720004-1  
红外与激光工程  
第
期
第
卷
47  
7
距离至少延长了 30 km。实验同时表明温度的影响值为 0ꢂ005 ꢃ6 dB/℃，温度对测量值影响很小，而且该传  
感器系统还可以有效消除光源和外界环境带来的干扰。  
关键词：  
盐度传感器； 光纤准直器； 相对反射强度  
hard to achieve wide applicationsꢂ In addition,  
most of the methods above can′ t effectively  
eliminate the errors resulting from the fluctuation  
of light source and influences of environment, and  
some of those has poor signal to noise ratio which  
is unsuitable for long distance measurementꢂ  
Therefore, it is important to research a salinity  
sensor that is easy to operate and with high SNR  
ratio for real-time and remote monitoringꢂ  
0 Introduction  
One of the fundamental parameters for  
seawater is salinity, and salinity is also an  
important factor for the monitoring of water  
qualityꢂ Therefore, salinity measurement has its  
great significance in many fields such as marine  
environment  
monitoring,  
seasonal  
climatic  
prediction, agriculture, fishing and many industrial  
In this paper, a simple technique based on  
relative back reflection for long -distance and  
real -time measurement of salinity is presented  
and designedꢂ A common collimator is firstly used  
as a sensing headꢂ Theoretical analysis and the  
experimental setup of the method are introduced  
and discussed in detailꢂ The experimental results  
demonstrate the SNR of this measuring method by  
using the collimator -sensor is at least 6ꢂꢃꢃ dB  
more than the common method by using fiber -  
sensor, and the temperature influence is very  
little, which is estimated to be 0ꢂ005 ꢃ6 dB/℃ ꢂ The  
whole system consists of non -bulk fiber -optic  
components without any optical alignmentꢂ Simple  
structure and easily -replaced probe make it easy  
to be industrializedꢂ  
[1 -3]  
fields  
ꢂ Many methods and technologies have  
been proposed and demonstrated for salinity  
measurementꢂ Traditionally, the salinity can be  
determined by means of chemical and destructive  
methods, such as titration with silver nitrate or by  
measuring the electrical conductivity, which is  
[ꢁ]  
due to the presence of chlorine ions in solution  
ꢂ
However, those methods require laboratorial  
analysis or are sensitive to electrical interference  
and ambient environment parametersꢂ  
Compared with non -optical techniques,  
nowadays, optical fiber salinity sensors have been  
widely adopted for their unique advantages, such  
as immunity to electromagnetic interferences,  
stability, repeatability, compact size, durability  
against harsh environments, non -destructive, and  
real time onlineꢂ Among different types of optical  
salinity sensors, those based on fiber Bragg  
1 Principle of operation  
[5-6]  
[7]  
I n this work, there are two basic ideasꢂ One  
of the basic ideas is that the common fiber  
collimator has a larger surface than the end face  
of a fiber, which will bring about more reflected  
light power from the surfaceꢂ Therefore, a higher  
SNR and longer distance measurement ability may  
be gained in the measurementꢂ  
grating (FBG)  
and long period grating (LPFG)  
techniques have been researched widelyꢂ But they  
have the problem of requiring a wavelength code  
demodulator such as a high resolved spectrum  
meter which is expensiveꢂ Recently there are other  
[8]  
salinity sensors based on photonic crystal fibers ,  
[9]  
and based on plastic optic fibers ꢂ However, those  
Another basic idea is that the refractive index  
of the measured solution is a function of its  
fibers are required either to be chemically  
processed or to form a special shape, which is  
072ꢀꢀꢀꢁ-2  

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