CN113607196A - 一种光纤光栅与法帕腔复合传感信号解耦方法 - Google Patents

一种光纤光栅与法帕腔复合传感信号解耦方法 Download PDF

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CN113607196A
CN113607196A CN202110793731.6A CN202110793731A CN113607196A CN 113607196 A CN113607196 A CN 113607196A CN 202110793731 A CN202110793731 A CN 202110793731A CN 113607196 A CN113607196 A CN 113607196A
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申雅峰
隋广慧
江琴
张爽爽
王莉
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Beijing Changcheng Institute of Metrology and Measurement AVIC
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Abstract

本发明公开的一种光纤光栅与法帕腔复合传感信号解耦方法，属于光纤传感技术领域。本发明通过对复合传感器反射光谱信号进行光谱峰值检测和光谱信号解耦得到峰值差序列，通过波长解算模块解耦出光纤光栅传感器的波长和用于光纤法帕传感器的腔长计算的光纤法帕传感器的反射光谱峰值序列，通过光波频率插值重采样、光程差自校准和腔长解算模块得到光纤法帕传感器的腔长。本发明通过一套解调装置同时实现光纤光栅传感器和光纤法帕传感器的解调，得到光纤光栅传感器的波长和光纤法帕传感器的腔长，且能够提高测量分辨率。本发明能够显著降低成本，也有利于更加灵活地复用光纤光栅传感器和光纤法帕传感器。

Description

一种光纤光栅与法帕腔复合传感信号解耦方法
技术领域
本发明属于光纤传感技术领域，涉及一种光纤光栅与法帕腔复合传感信号解耦方法。
技术背景
光纤光栅传感器和光纤法帕传感器是光纤传感器的典型代表，两者各有所长，均得到了广泛的应用。充分结合两类传感器的优势，可以组成的光纤光栅与法帕腔复合传感器，这大大拓展了光纤传感应用的场合。在这种情况下，如果采用两套独立的解调装置分别对光纤光栅传感器、光纤法帕传感器的传感信号进行解调，虽然在技术上比较成熟，但同时也增加了解调系统的复杂程度，降低了系统的可靠性，明显提高了解调成本。因此，对光纤光栅与法帕腔复合传感器信号进行解耦技术研究是必要的，能够解决用一套解调装置同时完成光纤光栅传感器波长值和光纤法帕传感器腔长值的解调难题。
发明内容
本发明公开的一种光纤光栅与法帕腔复合传感信号解耦方法要解决的技术问题是：通过一套解调装置同时实现光纤光栅传感器和光纤法帕传感器的解调，得到光纤光栅传感器的波长和光纤法帕传感器的腔长，且能够提高测量分辨率。利用所述解耦方法对光纤光栅与法帕腔复合传感器进行解调，能够显著降低成本，也有利于更加灵活地复用光纤光栅传感器和光纤法帕传感器。
本发明的目的是通过下述技术方案实现的：
本发明公开的一种光纤光栅与法帕腔复合传感信号解耦方法，通过对复合传感器反射光谱信号进行光谱峰值检测和光谱信号解耦得到峰值差序列，通过波长解算模块解耦出光纤光栅传感器的波长和用于光纤法帕传感器的腔长计算的光纤法帕传感器的反射光谱峰值序列，最后通过光波频率插值重采样、光程差自校准和腔长解算模块得到光纤法帕传感器的腔长。
本发明公开的一种光纤光栅与法帕腔复合传感信号解耦方法，通过对复合传感器反射光谱信号进行解耦处理分析，得到光纤光栅传感器的波长和光纤法帕传感器的腔长，包括如下步骤：
步骤一：通过自适应半峰检测模块101查找得到复合传感器反射光谱峰值序列[λ1,λ2,…,λn]，其中λ1,λ2,…,λn为反射光谱中的n个峰值的波长值；
步骤二：光谱信号解耦模块102，将反射光谱峰值序列[λ1,λ2,…,λn]的相邻谱峰对应的波长两两相减，计算出相邻的两个谱峰之间的波长间隔，得到峰值差序列[Δλ1,Δλ2,…,Δλn-1]，其中Δλ1,Δλ2,…,Δλn-1为反射光谱中的n-1个峰值的波长差值；
步骤三：通过波长解算模块103计算峰值差序列的平均值，找到谱峰序列相比于峰值差序列的平均值中的最小值索引M，解算出光纤光纤光栅传感器的波长为λM；
步骤四：通过腔长解耦模块104将波长解算模块103中解耦用的光纤光栅波长λM去除后，得到光纤法帕传感器的反射光谱峰值序列L＝[L1,L2,…,LJ]，其中L1,L2,…,LJ为反射光谱中去除λM后的J个峰值的波长值；
步骤五：光波频率插值重采样模块105，对反射光谱峰值序列L＝[L1,L2,…,LJ]取倒数得到对应的光频率序列
Figure BDA0003159495630000021
其中F1,F2,…,FJ为J个峰值计算得到的光频率值，再对所述序列进行等间隔插值重采样，得到新的光波频率序列f＝[f1,f2,…,fJ]，其中f1,f2,…,fJ为J个光频率值重采样后得到的J个新的光频率值；
步骤六：光程差自校准模块106，因为插值后的光波频率序列f＝[f1,f2,…,fJ]为等差序列，则可以得到公差q，通过计算得到校准后的光程差序列
Figure BDA0003159495630000022
其中d1,d2,…dJ为光程差自校准后得到的J个光程差值；
步骤七：腔长解算模块107通过计算光程差序列d＝[d1,d2,…,dJ]的平均值得到光纤法帕传感器的腔长
Figure BDA0003159495630000023
通过步骤一到步骤七所述的一种光纤光栅与法帕腔复合传感信号解耦方法在步骤三中实现光纤光栅传感器波长的解调，同时通过步骤四至步骤六的数据处理，在步骤七中实现光纤法帕传感器的解调，且能够通过步骤五的光波频率插值重采样处理以及步骤六的光程差自校准处理提高光纤法帕传感器腔长值的测量分辨率。
有益效果：
本发明对比已有技术有以下显著创新点：本发明公开的一种光纤光栅与法帕腔复合传感信号解耦方法，适用于多点光纤光栅传感器、光纤光栅-法帕复合高反射传感器和光纤光栅-法帕复合低反射传感器3种不同种类的复合传感器，具有如下优点：
1、通过一套解调装置同时实现光纤光栅传感器和光纤法帕传感器的解调，得到光纤光栅传感器的波长和光纤法帕传感器的腔长，且能够提高测量分辨率。利用所述解耦方法对光纤光栅与法帕腔复合传感器进行解调，能够显著降低成本，也有利于更加灵活地复用光纤光栅传感器和光纤法帕传感器。
2、本发明公开的一种光纤光栅与法帕腔复合传感信号解耦方法，采用对复合传感器反射光谱信号进行光谱信号数据处理分析，实现同时对光纤光栅传感器波长值和光纤法帕传感器腔长值的解调。
3、本发明公开的一种光纤光栅与法帕腔复合传感信号解耦方法，通过对光波频率域进行重采样和光程差自校准，能够提高光纤法帕传感器腔长值测量分辨率。
附图说明
图1为本发明公开的一种光纤光栅与法帕腔复合传感信号解耦方法流程图；
图2为光纤光栅与法帕腔复合传感信号的反射光谱；
图3为同一支光纤光栅与法帕腔复合传感器在使用和不使用光波频率域重采样和光程差自校准模块两种情况下分别进行100次采样解调结果。
具体实施方式
下面结合附图和实施例对本发明做进一步详细说明：
实施例
一只波长为1527.347nm和腔长为102.958μm的光纤光栅与法帕腔复合传感器，所采集到的反射光谱如图2所示，图中的横坐标为数据采样序列，纵坐标为信号幅度，单位是V。如图1所示，本实施例公开的一种光纤光栅与法帕腔复合传感信号解耦方法，通过如下步骤实现光纤光栅与法帕腔复合传感信号的解耦，得到光纤法帕传感器的腔长和光纤光纤光栅传感器的波长。
步骤一：自适应半峰检测模块101查找得到复合传感器反射光谱峰值序列[λ1，λ2，…，λ5]＝[1527.347,1536.606,1548.209，1560.11，1571.873]；
步骤二：光谱信号解耦模块102，将反射光谱峰值序列的相邻谱峰对应的波长两两相减，计算出相邻的两个谱峰之间的波长间隔，得到峰值差序列[λ1-λ2，λ2-λ3，λ3-λ4，λ4-λ5]＝[9.259，11.603，11.901，11.763]；
步骤三：波长解算模块103，计算峰值差序列的平均值为11.1315，找到谱峰序列相比于峰值差序列平均值
Figure BDA0003159495630000041
中的最小值索引M＝1，解算出光纤光纤光栅传感器的波长为λFBG＝λ1＝1527.347；
步骤四：腔长解耦模块104，将波长解算模块103中解耦用的光纤光栅波长λFBG＝λ1＝1527.347去除后，得到光纤法帕传感器的反射光谱峰值序列L＝[L1，L2，L3，L4]＝[1536.606，1548.209，1560.11，1571.873]；
步骤五：光波频率插值重采样模块105，对反射光谱峰值序列取倒数得到对应的光频率序列
Figure BDA0003159495630000042
再对这个序列进行等间隔插值重采样，得到新的光波频率序列
f＝[f1，f2，f3，f4]＝[6507.74，6459.01，6410.28，6361.55]；
步骤六：光程差自校准模块106，因为插值后的光波频率序列f＝[f1，f2，f3，f4]＝[6507.74，6459.01，6410.28，6361.55]为等差序列，则能够得到公差q＝48.73，通过计算得到校准后的光程差序列
Figure BDA0003159495630000043
d＝[102.953，102.956，102.967，102.958]；
步骤七：腔长解算模块107通过计算光程差序列d＝[102.953，102.956，102.967，102.958]的平均值得到光纤法帕传感器的腔长
Figure BDA0003159495630000044
对于光纤法帕传感器的腔长的解调在不使用光波频率域进行重采样和光程差自校准模块进行数据处理的情况下，能够直接通过光纤法帕传感器的反射光谱峰值序列L＝[L1，L2，L3，L4]＝[1536.606，1548.209，1560.11，1571.873]进行计算得到光纤法帕传感器的腔长值为D′＝102.956。对比同一支光纤光栅与法帕腔复合传感器在使用和不使用光波频率域重采样和光程差自校准模块，两种情况下分别进行100次采样解调结果如图3所示，可以看到光纤法帕传感器腔长值测量分辨率在使用光波频率域重采样和光程差自校准模块时得到了明显的提高。
以上结合附图对本发明的具体实施方式作了说明，但这些说明不能被理解为限制了本发明的范围，本发明的保护范围由随附的权利要求书限定，任何在本发明权利要求基础上的改动都是本发明的保护范围。

Claims (1)

1.一种光纤光栅与法帕腔复合传感信号解耦方法，其特征在于：通过对复合传感器反射光谱信号进行解耦处理分析，光纤光栅传感器的波长和光纤法帕传感器的腔长，包括如下步骤，
步骤一：通过自适应半峰检测模块101查找得到复合传感器反射光谱峰值序列[λ1,λ2,…,λn]，其中λ1,λ2,…,λn为反射光谱中的n个峰值的波长值；
步骤二：光谱信号解耦模块102，将反射光谱峰值序列[λ1,λ2,…,λn]的相邻谱峰对应的波长两两相减，计算出相邻的两个谱峰之间的波长间隔，得到峰值差序列[Δλ1,Δλ2,…,Δλn-1]，其中Δλ1,Δλ2,…,Δλn-1为反射光谱中的n-1个峰值的波长差值；
步骤三：通过波长解算模块103计算峰值差序列的平均值，找到谱峰序列相比于峰值差序列的平均值中的最小值索引M，解算出光纤光纤光栅传感器的波长为λM；
步骤四：通过腔长解耦模块104将波长解算模块103中解耦用的光纤光栅波长λM去除后，得到光纤法帕传感器的反射光谱峰值序列L＝[L1,L2,…,LJ]，L其中L1,L2,…,LJ为反射光谱中去除λM后的J个峰值的波长值；
步骤五：光波频率插值重采样模块105，对反射光谱峰值序列L＝[L1,L2,…,LJ]取倒数得到对应的光频率序列
Figure FDA0003159495620000011
其中F1,F2,…,FJ为J个峰值计算得到的光频率值，再对所述序列进行等间隔插值重采样，得到新的光波频率序列f＝[f1,f2,…,fJ]，其中f1,f2,…,fJ为J个光频率值重采样后得到的J个新的光频率值；
步骤六：光程差自校准模块106，因为插值后的光波频率序列f＝[f1,f2,…,fJ]为等差序列，则得到公差q，通过计算得到校准后的光程差序列
Figure FDA0003159495620000012
其中d1,d2,…dJ为光程差自校准后得到的J个光程差值；
步骤七：腔长解算模块107通过计算光程差序列d＝[d1,d2,…,dJ]的平均值得到光纤法帕传感器的腔长
Figure FDA0003159495620000013
通过步骤一到步骤七所述的一种光纤光栅与法帕腔复合传感信号解耦方法在步骤三中实现光纤光栅传感器波长的解调，同时通过步骤四至步骤六的数据处理，在步骤七中实现光纤法帕传感器的解调，且能够通过步骤五的光波频率插值重采样处理以及步骤六的光程差自校准处理提高光纤法帕传感器腔长值的测量分辨率。
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