CN116754104A - 一种光纤光栅激光热场传感器及其应用方法 - Google Patents
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Abstract
本发明涉及热量测量技术领域,特别涉及一种光纤光栅激光热场传感器及其应用方法,半导体泵浦激光器经过波分复用器与均匀有源相移光纤光栅相连,均匀有源相移光纤光栅的后端熔接光热光纤,波分复用器的信号端连接光纤隔离器,光纤隔离器连接功率计或波长计。本发明的有益效果是:本发明的光纤光栅激光热场传感器是强度解调型传感器,相对波长解调灵敏度更高;利用光纤光栅激光器的剩余泵浦光作为光纤热线的激励源,仅在光纤光栅激光器后端熔接光热光纤构成,结构简单,可制作成探针传感器;易于通过改变封装材料和结构,调整传感器热容,适应不同灵敏度响应要求的热场变化检测。
Description
技术领域
本发明涉及热量测量技术领域,特别涉及一种光纤光栅激光热场传感器及其应用方法。
背景技术
光纤热线传感器具有动态响应快、抗干扰能力强、结构简单、测量距离远、适用场合多等很多独特的优势,已经成为光纤传感器领域一大研究热门。目前,常规的光纤热线传感器,一种是在倾斜光栅或长周期光栅外镀金属膜,利用光栅包层模辐照膜层发热构成光纤热线,另一种是在光热光纤上刻写光纤光栅,泵浦光加热光热光纤使得光栅波长变化构成。这些方法都是采用温度灵敏度较低(一般为10pm/℃)的光纤光栅作为传感元件,采用波长解调的方法进行温度场测量,限制了测量灵敏度的提升,无法适用于微弱变化的热场测量;在必须使用光纤光栅解调仪的同时,还需要额外的光源加热光纤热线,结构复杂且成本增加。
分布反馈光纤激光器是一种光纤光栅激光器,由刻写在有源光纤上的均匀相移光栅构成,具有极窄线宽和极强环境敏感性的特征,常通过波长相位解调的方式用作声波和振动信号传感器。光纤激光器优点之一是具有良好的散热性能,但反之温度场分布异常也会影响激光输出性能,尤其对短腔光纤光栅激光器。当光纤光栅激光器受外界温度场影响,光纤光栅周期均匀性改变时,会导致激光腔损耗变大,造成输出功率的明显下降。利用此特征,可以在光纤光栅激光器上连接光纤热线结构,构造成光纤激光热线式传感器,通过测量激光输出功率变化来反演环境热场变化。
为此,本申请设计了一种新型的光纤光栅激光热线式热场传感器。首先利用光纤热线在光纤光栅激光器上产生温度梯度,造成光纤光栅谐振腔啁啾效应,进而导致激光输出功率相对于常规状态明显降低。当外界气流或液流带走光纤热线热量时,温度梯度变小啁啾效应变弱,激光功率提高,通过测量激光功率变化反演环境热场变化。同时,通过测量激光波长信息,也可以直接测量所处环境温度情况。这为特殊工业生产过程和科研环境中对微弱热场变化的监测需求,提供了一种新的技术手段。
发明内容
本发明为了弥补现有技术中的不足,提供了一种光纤光栅激光热场传感器及其应用方法。
本发明是通过如下技术方案实现的:
一种光纤光栅激光热场传感器,包括均匀有源相移光纤光栅及连接在其后的光热光纤,所述均匀有源相移光纤光栅前端与波分复用器公共端相连,波分复用器泵浦端与半导体泵浦激光器相连,波分复用器的信号端连接光纤隔离器,光纤隔离器连接功率计或波长计,由此构成光纤光栅激光器结构;均匀有源相移光纤光栅的后端与光热光纤相连,构成光纤热线结构。
进一步地,为了更好的实现本发明,所述均匀有源相移光纤光栅在泵浦光作用下产生激光从波分复用器信号端经光纤隔离器输出,并由功率计或波长计测量记录;未被充分吸收的剩余泵浦光从均匀有源相移光纤光栅进入光热光纤,光热光纤吸收泵浦光后发热成为热源,热场会沿均匀有源相移光纤光栅按照热传导规律形成温度场梯度分布。
进一步地,为了更好的实现本发明,所述均匀有源相移光纤光栅为均匀掺铒相移光纤光栅,所述光热光纤为掺钴光纤,均匀掺铒相移光纤光栅和掺钴光纤共同封装在石英U型管中,构成光纤探针。
进一步地,为了更好的实现本发明,所述均匀有源相移光纤光栅可以是刻写在掺铒、镱、钬、铥等镧系稀土元素光纤上。
进一步地,为了更好的实现本发明,所述光热光纤可以是掺钴光纤及其他吸光发热型光纤。
进一步地,为了更好的实现本发明,所用半导体泵浦激光器为对应稀土元素激发波长和光热光纤敏感波长的激光器,所述波分复用器工作波长也与之对应。
进一步地,为了更好的实现本发明,在一定泵浦功率下,对光热光纤进行热场干扰,如将其放入气流或液流中,热量交换会使光纤热线及光纤光栅谐振腔热场梯度分布变弱,光纤光栅谐振腔热致啁啾效应相应减弱,激光输出功率趋于恢复到正常值。在此过程中,由功率计或波长计测量记录激光输出功率值和激光波长变化,进而可以反演推算光纤光栅激光热场传感器所处环境的热场变化,如气流速度、液流速度和液流温度等。
本发明的有益效果是:
本发明的光纤光栅激光热场传感器是强度解调型传感器,相对波长解调灵敏度更高;利用光纤光栅激光器的剩余泵浦光作为光纤热线的激励源,仅在光纤光栅激光器后端熔接光热光纤构成,结构简单,可制作成探针传感器;易于通过改变封装材料和结构,调整传感器热容,适应不同灵敏度响应要求的热场变化检测。
附图说明
图1为本发明的光纤光栅热场传感器结构示意图;
图2为本发明的光纤热线结构及其热梯度分布图;
图3为本发明的光纤光栅激光器输出功率随光栅啁啾率变化图。
图中,
1、半导体泵浦激光器,2、波分复用器,3、均匀有源相移光纤光栅,4、光纤隔离器,5、功率计或波长计,6、光热光纤。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述。显然,所描述的实施例仅仅是本发明的一部分实施例,而不是全部的实施例。通常在此处附图中描述和示出的本发明实施例的组件可以以各种不同的配置来布置和设计。
因此,以下对在附图中提供的本发明的实施例的详细描述并非旨在限制要求保护的本发明的范围,而是仅仅表示本发明的选定实施例。基于本发明的实施例,本领域技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例,都属于本发明保护的范围。
图1-图3为本发明的一种具体实施例,该实施例为一种掺铒分布反馈光纤激光热场传感器,980nm半导体泵浦激光器经980/1550波分复用器,与均匀掺铒相移光纤光栅相连,均匀掺铒相移光纤光栅在300mW泵浦光作用下产生约400uW 1550nm激光从波分复用器信号端经隔离器输出,进入功率计测量记录变化。约200mW未被吸收的剩余泵浦光从均匀掺铒相移光纤光栅进入1cm长掺钴光纤,掺钴光纤吸收泵浦光后发热成为热源,热场会沿均匀掺铒相移光纤光栅按照热传导规律形成温度场分布,如图2所示。均匀掺铒相移光纤光栅和掺钴光纤共同封装在石英U型管中,构成光纤探针。此时,受光纤光栅谐振腔热致啁啾效应调控,激光输出功率降至约100uW。
将光纤探针尾端放入待测气流环境,热量交换会使光纤热线温度降低,光纤光栅谐振腔热致啁啾效应相应减弱。气流速度越快,光纤热线散热越迅速,则光纤热线结构上的热场分布梯度越小,激光输出功率提高。通过测量激光输出功率变化,即可推算出光纤探针所处气流环境的气流流速。
不同泵浦功率下建立的热场梯度分布如图2所示,泵浦功率P1>P2>P3。在一定泵浦功率下,均匀有源相移光纤光栅会由于以图2所示的热场分布导致热致啁啾效应而不再是均匀光栅,周期性结构被破坏造成谐振腔损耗变大,激光输出功率降低。激光输出功率P与光纤光栅谐振腔的热致啁啾率C有对应关系,如图3所示,由此激光输出功率P也就与光热光纤构成的光纤热线温度有对应关系。
最后说明的是,以上实施例仅用以说明本发明的技术方案而非限制,本领域普通技术人员对本发明的技术方案所做的其他修改或者等同替换,只要不脱离本发明技术方案的精神和范围,均应涵盖在本发明的权利要求范围当中。
Claims (4)
1.一种光纤光栅激光热场传感器,包括均匀有源相移光纤光栅(3)和光热光纤(6),其特征在于:
所述均匀有源相移光纤光栅(3)前端与波分复用器(2)公共端相连,波分复用器(2)泵浦端与半导体泵浦激光器(1)相连,波分复用器(2)的信号端连接光纤隔离器(4),光纤隔离器(4)连接功率计或波长计(5),由此构成光纤光栅激光器;均匀有源相移光纤光栅(3)的后端与光热光纤(6)熔接,构成光纤热线。
2.根据权利要求1所述的光纤光栅激光热场传感器,其特征在于:
所述均匀有源相移光纤光栅(3)在泵浦光作用下产生激光从波分复用器(2)信号端经光纤隔离器(4)输出,并由功率计或波长计(5)测量记录;未被充分吸收的剩余泵浦光从均匀有源相移光纤光栅(3)进入光热光纤(6),光热光纤(6)吸收泵浦光后发热成为热源,热场会沿均匀有源相移光纤光栅(3)按照热传导规律形成温度场梯度分布,导致光纤光栅激光谐振腔啁啾效应,进而导致所构成的光纤光栅激光器输出功率明显降低。
3.根据权利要求1所述的光纤光栅激光热场传感器,其特征在于:
所述均匀有源相移光纤光栅(3)为均匀掺铒相移光纤光栅,所述光热光纤(6)为掺钴光纤,均匀掺铒相移光纤光栅和掺钴光纤共同封装在石英U型管中,构成光纤探针。
4.一种光纤光栅激光热场传感器的应用方法,利用权利要求1-3任意一项所述的光纤光栅激光热场传感器,其特征在于,包括以下步骤:
S1,将光纤探针置于待测环境中,气流或液流造成的环境热交换会改变光纤探针中的光热光纤(6)的温度;
S2,光热光纤(6)的温度改变会影响均匀有源相移光纤光栅(3)上的温度场分布梯度,进而改变光纤光栅激光谐振腔的啁啾效应和光纤光栅激光器输出功率大小;
S3,由功率计或波长计(5)测量记录激光功率和波长数据变化,可测量待测环境热交换情况。
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