CN116223419A - 一种双光子法定量检测二氧化碳同位素的装置及光谱仪 - Google Patents
一种双光子法定量检测二氧化碳同位素的装置及光谱仪 Download PDFInfo
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Abstract
本发明提供了一种双光子法定量检测二氧化碳同位素的装置及光谱仪,这种装置基于双光子吸收的技术,通过激光频率锁定模块将激光锁定在高精细度光腔上,使激光的频率与高精细度光腔的模式频率一致;通过压电陶瓷单元调节高精细度光腔的光腔长度,进而调谐高精细度光腔的模式频率,使激光的频率与目标分子同位素的能级匹配,目标分子同位素被选择性激发;通过信号探测模块测量高精细度光腔的透射光强得到双光子吸收信号,由信号处理模块对双光子吸收信号进行分析处理得到目标分子同位素的浓度;由于双光子吸收具有无多普勒性质,光谱线宽得到压窄,可以有效提高光谱分辨率和同位素选择性,进而实现二氧化碳同位素的高灵敏定量检测。
Description
技术领域
本发明涉及光谱检测领域,更具体地说,涉及一种双光子法定量检测二氧化碳同位素的装置及光谱仪。
背景技术
二氧化碳是地球大气中最重要的温室气体之一,是碳循环的关键因素;由于同位素分馏效应,定量检测二氧化碳样品中的各种同位素含量可以用来区分样品来源,被广泛应用于年代测定和示踪、司法鉴定、环境检测和药物代谢等领域;激光光谱法作为当前检测二氧化碳同位素的重要方法之一,在定量检测中具有极大的应用潜力;激光光谱法灵敏测量二氧化碳同位素的主要思想是用光腔衰荡光谱的方法来测量二氧化碳同位素的光谱信号。
然而,目前使用激光光谱法测定二氧化碳同位素除了灵敏度需要提高外,还存在测量选择性明显不足的问题;并且使用激光光谱法受限于光谱本身的多普勒线宽,因此不能有效分辨二氧化碳同位素与其他碳同位素、其它分子同位素的光谱,难以实现精确定量测量。
发明内容
有鉴于此,为解决上述问题,本发明提供一种双光子法定量检测二氧化碳同位素的装置及光谱仪,技术方案如下:
一种双光子法定量检测二氧化碳同位素的装置,所述装置包括:激光源、激光频率锁定模块、样品室、信号探测模块和信号处理模块;所述样品室包括高精细度光腔和压电陶瓷单元;
所述激光源用于输出激光;
所述激光频率锁定模块用于将所述激光锁定在所述高精细度光腔上;
所述压电陶瓷单元用于调节所述高精细度光腔的光腔长度,以改变所述高精细度光腔的模式频率,使所述激光的频率与目标分子同位素的能级匹配;
所述信号探测模块用于探测所述高精细度光腔透射出的所述目标分子同位素的光强,得到双光子吸收信号;
所述信号处理模块用于对所述双光子吸收信号进行分析处理,得到所述目标分子同位素的浓度。
优选的,在上述双光子法定量检测二氧化碳同位素的装置中,所述激光源为红外激光源,所述激光为连续红外激光,所述激光的输出功率大于100mW。
优选的,在上述双光子法定量检测二氧化碳同位素的装置中,所述高精细度光腔的精细度高于60000。
优选的,在上述双光子法定量检测二氧化碳同位素的装置中,所述目标分子同位素的能级包括:
双光子能级和单光子共振能级;
所述单光子共振能级位于所述双光子能级之间的中间区域。
优选的,在上述双光子法定量检测二氧化碳同位素的装置中,经过所述激光锁定模块处理后的所述激光的频率为所述目标分子同位素的能级差的二分之一。
优选的,在上述双光子法定量检测二氧化碳同位素的装置中,所述高精细度光腔的温度的波动幅度小于10mK。
优选的,在上述双光子法定量检测二氧化碳同位素的装置中,所述样品室还包括:温控单元;
所述温控单元用于控制所述高精细度光腔的温度。
优选的,在上述双光子法定量检测二氧化碳同位素的装置中,所述信号探测模块包括:灵敏探测单元和低噪声信号放大单元;
所述灵敏探测单元和所述低噪声信号放大单元为一体化集成单元;
所述灵敏探测单元用于探测所述高精细度光腔透射出的所述目标分子同位素的光强,得到双光子吸收信号;
所述低噪声信号放大单元用于放大所述双光子吸收信号。
优选的,在上述双光子法定量检测二氧化碳同位素的装置中,所述信号处理模块包括:信号处理程序和交互界面;
所述信号处理程序用于对所述双光子吸收信号进行分析处理,得到所述目标分子同位素的浓度;
所述交互界面用于显示所述目标分子同位素的浓度。
一种光谱仪,所述光谱仪包括上述任一项所述的双光子法定量检测二氧化碳同位素的装置。
相较于现有技术,本发明实现的有益效果为:
本发明提供的一种双光子法定量检测二氧化碳同位素的装置,所述装置包括:激光源、激光频率锁定模块、样品室、信号探测模块和信号处理模块;所述样品室包括高精细度光腔和压电陶瓷单元;所述激光源用于输出激光;所述激光频率锁定模块用于将所述激光锁定在所述高精细度光腔上;所述压电陶瓷单元用于调节所述高精细度光腔的光腔长度,以改变所述高精细度光腔的模式频率,使所述激光的频率与目标分子同位素的能级匹配;所述信号探测模块用于探测所述高精细度光腔透射出的所述目标分子同位素的光强,得到双光子吸收信号;所述信号处理模块用于对所述双光子吸收信号进行分析处理,得到所述目标分子同位素的浓度。本发明提供的这种装置基于双光子吸收的技术,通过激光频率锁定模块控制激光的频率从而将激光锁定在高精细度光腔上,使所述激光的频率与所述高精细度光腔的模式频率一致;通过压电陶瓷单元对所述高精细度光腔的光腔长度进行调节来调谐高精细度光腔的模式频率,从而调谐激光的频率,使激光的频率与目标分子同位素的能级匹配,一旦激光的频率与目标分子同位素的能级匹配,目标分子同位素被选择性激发;通过信号探测模块测量高精细度光腔的透射光强,当光强足够强时,目标分子同位素可以吸收两个光子,从而得到双光子吸收信号;由信号处理模块对所述双光子吸收信号进行分析处理,得到所述目标分子同位素的浓度;由于双光子吸收具有无多普勒性质,光谱线宽得到压窄,可以有效提高光谱分辨率和同位素选择性,从而有效分辨二氧化碳同位素与其它碳同位素、其它分子同位素的光谱;由于双光子吸收信号与激发后的透射光强的平方成正比的性质,提升透射光强可以得到足够强度的双光子信号,进而实现二氧化碳同位素的高灵敏定量检测。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据提供的附图获得其他的附图。
图1为本发明实施例提供的一种双光子法定量检测二氧化碳同位素的装置的结构示意图;
图2为本发明实施例提供的一种双光子法定量检测二氧化碳同位素的装置的能级匹配图;
图3为本发明实施例提供的另一种双光子法定量检测二氧化碳同位素的装置的结构示意图;
图4为本发明实施例提供的又一种双光子法定量检测二氧化碳同位素的装置的结构示意图;
图5为本发明实施例提供的又一种双光子法定量检测二氧化碳同位素的装置的结构示意图;
图6为本发明实施例提供的一种光谱仪的原理结构示意图。
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一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动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。
为使本发明的上述目的、特征和优点能够更加明显易懂,下面结合附图和具体实施方式对本发明作进一步详细的说明。
本发明实施例提供了一种双光子法定量检测二氧化碳同位素的装置,参考图1,图1为本发明实施例提供的一种双光子法定量检测二氧化碳同位素的装置的结构示意图,结合图1,该双光子法定量检测二氧化碳同位素的装置包括:
激光源1、激光频率锁定模块2、样品室3、信号探测模块4和信号处理模块5;所述样品室3包括高精细度光腔6和压电陶瓷单元7。
所述激光源1用于输出激光;所述激光频率锁定模块2用于将所述激光锁定在所述高精细度光腔6上。
具体的,在本发明实施例中,所述激光源1输出的激光可以通过反射镜8改变其光路,使得激光反射到分光镜9,通过分光镜9可以将一部分激光发射到样品室3中,将另一部分激光发射到激光频率锁定模块2中;发射到激光频率锁定模块2中的激光可以通过激光频率模块2对激光的频率和相位进行调制和解调制,并且产生误差信号,然后根据误差信号产生负反馈信号,将负反馈信号输送给激光源1从而控制激光源1发出的激光频率,使得激光源1输出的激光与高精细度光腔6的模式频率一致;另外所述激光锁定模块2还能自动识别所述激光源1输出的激光是否被锁定在所述高精细度光腔6上,若所述激光锁定模块2识别到所述激光源1输出的激光未被锁定在所述高精细度光腔6上,则所述激光锁定模块2将会自动进行控制所述激光源1输出的激光的频率,从而将所述激光锁定在所述高精细度光腔6上。
所述压电陶瓷单元7用于调节所述高精细度光腔6的光腔长度,以改变所述高精细度光腔6的模式频率,使所述激光的频率与目标分子同位素的能级匹配。
所述信号探测模块4用于探测所述高精细度光腔6透射出的所述目标分子同位素的光强,得到双光子吸收信号。
所述信号处理模块5用于对所述双光子吸收信号进行分析处理,得到所述目标分子同位素的浓度。
本发明提供的一种双光子法定量检测二氧化碳同位素的装置,所述双光子法定量检测二氧化碳同位素的装置包括:激光源1、激光频率锁定模块2、样品室3、信号探测模块4和信号处理模块5;所述样品室3包括高精细度光腔6和压电陶瓷单元7;所述激光源1用于输出激光;所述激光频率锁定模块2用于将所述激光锁定在所述高精细度光腔6上;所述压电陶瓷单元7用于调节所述高精细度光腔6的光腔长度,以改变所述高精细度光腔6的模式频率,使所述激光的频率与目标分子同位素的能级匹配;所述信号探测模块4用于探测所述高精细度光腔6透射出的所述目标分子同位素的光强,得到双光子吸收信号;所述信号处理模块5用于对所述双光子吸收信号进行分析处理,得到所述目标分子同位素的浓度。本发明提供的这种双光子法定量检测二氧化碳同位素的装置基于双光子吸收的技术,通过激光频率锁定模块2控制所述激光源1输出的激光的频率从而将所述激光源1输出的激光锁定在高精细度光腔6上,使所述激光源1输出的激光的频率与所述高精细度光腔6的模式频率一致;通过压电陶瓷单元7对所述高精细度光腔6的光腔长度进行调节来调谐高精细度光腔6的模式频率,从而调谐所述激光源1输出的激光的频率,使所述激光源1输出的激光的频率与目标分子同位素的能级匹配,一旦所述激光源1输出的激光的频率与目标分子同位素的能级匹配,目标分子同位素被选择性激发;通过信号探测模块4测量高精细度光腔的透射光强,当光强足够强时,目标分子同位素可以吸收两个光子,从而得到双光子吸收信号;由信号处理模块5对所述双光子吸收信号进行分析处理,得到所述目标分子同位素的浓度;由于双光子吸收具有无多普勒性质,光谱线宽得到压窄,可以有效提高光谱分辨率和同位素选择性,从而有效分辨二氧化碳同位素与其它碳同位素、其它分子同位素的光谱;由于双光子吸收信号与激发后的透射光强的平方成正比的性质,提升透射光强可以得到足够强度的双光子信号,进而实现二氧化碳同位素的高灵敏定量检测;应用本发明提供的这种装置,较传统激光光谱法的分辨率高,信号强,能够实现对二氧化碳同位素的高分辨高灵敏检测。
可选的,在本发明提供的另一实施例中,对上述一种双光子法定量检测二氧化碳同位素的装置的结构进行进一步示例说明,详细介绍如下:
所述激光源1为红外激光源,所述激光为连续红外激光,所述激光的输出功率大于100mW。
所述高精细度光腔6的精细度高于60000。
具体的,在本发明实施例中,所述激光源1输出的激光的输出波长具有可以快速调谐的特点,本发明实施例中所述激光源1输出的激光的输出波长的调谐带宽以1MHz为最优调谐带宽;所述高精细度光腔6对单一激光频率的精细度高于60000。
所述目标分子同位素的能级包括:双光子能级和单光子共振能级;所述单光子共振能级位于所述双光子能级之间的中间区域。
经过所述激光锁定模块处理后的所述激光的频率为所述目标分子同位素的能级差的二分之一。
具体的,在本发明实施例中,所述目标分子同位素的能级为特殊选定的目标分子同位素的能级,如图2所示,图2为本发明实施例提供的一种双光子法定量检测二氧化碳同位素的装置的能级匹配图,图2中的标号E1和标号E3表示为双光子能级,图2中的标号E2表示为单光子共振能级,图2中标号E2位于标号E1和标号E3相差二分之一处的附近区域,即表示所述单光子能级位于所述双光子能级之间相差二分之一处的附近区域,所述单光子共振能级在所述双光子能级之间相差二分之一处的附近区域的范围不超过δ;另外,将所述激光源1输出的激光的频率控制为所述目标分子同位素的能级差的二分之一,所述激光源1输出的激光的频率与单光子共振能级相近,从而能够大幅提升双光子吸收信号强度。
可选的,在本发明提供的另一实施例中,对上述一种双光子法定量检测二氧化碳同位素的装置中的样品室3的结构进行进一步示例说明,参考图3,图3为本发明实施例提供的另一种双光子法定量检测二氧化碳同位素的装置的结构示意图,结合图3,所述样品室3还包括:
温控单元10,所述温控单元10用于控制所述高精细度光腔6的温度。
所述高精细度光腔6的温度的波动幅度小于10mK。
具体的,在本发明实施例中,为了使所述高精细度光腔6的温度的波动幅度小于10mK,包括但不限定通过采用所述温控单元10来控制所述高精细度光腔6的温度,使得所述高精细度光腔6的温度的波动幅度小于10mK,还可以采用其他温度调节方式调节所述高精细度光腔6的温度,使其波动幅度小于10mK。
可选的,在本发明提供的另一实施例中,对上述一种双光子法定量检测二氧化碳同位素的装置中的信号探测模块4的结构进行进一步示例说明,参考图4,图4为本发明实施例提供的又一种双光子法定量检测二氧化碳同位素的装置的结构示意图,结合图4,所述信号探测模块4还包括:
灵敏探测单元11和低噪声信号放大单元12;所述灵敏探测单元11和所述低噪声信号放大单元12为一体化集成单元。
所述灵敏探测单元11用于探测所述高精细度光腔6透射出的所述目标分子同位素的光强,得到双光子吸收信号。
所述低噪声信号放大单元12用于放大所述双光子吸收信号。
具体的,在本发明实施例中,当所述激光源1输出的激光的频率与目标分子同位素的能级匹配后,目标分子同位素就会被选择性激发,被激发的目标分子同位素从所述高精细度光腔6透射出,然后被所述灵敏探测单元11探测,从而得到双光子吸收信号;由于所述信号探测模块4探测得到的双光子吸收信号较为微弱,因此采用低噪声信号放大单元12对所述双光子吸收信号进行放大,便于后续对所述双光子吸收信号的处理。
可选的,在本发明提供的另一实施例中,对上述一种双光子法定量检测二氧化碳同位素的装置中的信号处理模块5的结构进行进一步示例说明,参考图5,图5为本发明实施例提供的又一种双光子法定量检测二氧化碳同位素的装置的结构示意图,结合图5,所述信号处理模块5还包括:
信号处理程序13和交互界面14;所述信号处理程序13用于对所述双光子吸收信号进行分析处理,得到所述目标分子同位素的浓度。
所述交互界面14用于显示所述目标分子同位素的浓度。
具体的,在本发明实施例中,所述交互界面14可以对显示的所述目标分子同位素的浓度进行实时更新和操作,所述交互界面14包括但不限定于电脑和手机等电子设备。
可选的,基于本发明上述实施例,在本发明另一实施例中还提供了一种光谱仪,参考图6,图6为本发明实施例提供的一种光谱仪的原理结构示意图,所述光谱仪包括上述实施例所述的双光子法定量检测二氧化碳同位素的装置。
具体的,在本发明实施例中,所述光谱仪具有与上述实施例所述双光子法定量检测二氧化碳同位素的装置相同的特征。
另外,还需要说明的是,本发明实施例所述的一种双光子法定量检测二氧化碳同位素的装置及光谱仪包括但不限于用于定量检测二氧化碳同位素,还可以用于检测其他分子同位素。
以上对本发明所提供的一种双光子法定量检测二氧化碳同位素的装置及光谱仪进行了详细介绍,本文中应用了具体个例对本发明的原理及实施方式进行了阐述,以上实施例的说明只是用于帮助理解本发明的方法及其核心思想;同时,对于本领域的一般技术人员,依据本发明的思想,在具体实施方式及应用范围上均会有改变之处,综上所述,本说明书内容不应理解为对本发明的限制。
需要说明的是,本说明书中的各个实施例均采用递进的方式描述,每个实施例重点说明的都是与其他实施例的不同之处,各个实施例之间相同相似的部分互相参见即可。对于实施例公开的装置而言,由于其与实施例公开的方法相对应,所以描述的比较简单,相关之处参见方法部分说明即可。
还需要说明的是,在本文中,诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来,而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者设备所固有的要素,或者是还包括为这些过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下,由语句“包括一个……”限定的要素,并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
对所公开的实施例的上述说明,使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的,本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下,在其它实施例中实现。因此,本发明将不会被限制于本文所示的这些实施例,而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。
Claims (10)
1.一种双光子法定量检测二氧化碳同位素的装置,其特征在于,所述装置包括:激光源、激光频率锁定模块、样品室、信号探测模块和信号处理模块;所述样品室包括高精细度光腔和压电陶瓷单元;
所述激光源用于输出激光;
所述激光频率锁定模块用于将所述激光锁定在所述高精细度光腔上;
所述压电陶瓷单元用于调节所述高精细度光腔的光腔长度,以改变所述高精细度光腔的模式频率,使所述激光的频率与目标分子同位素的能级匹配;
所述信号探测模块用于探测所述高精细度光腔透射出的所述目标分子同位素的光强,得到双光子吸收信号;
所述信号处理模块用于对所述双光子吸收信号进行分析处理,得到所述目标分子同位素的浓度。
2.根据权利要求1所述的装置,其特征在于,所述激光源为红外激光源,所述激光为连续红外激光,所述激光的输出功率大于100mW。
3.根据权利要求1所述的装置,其特征在于,所述高精细度光腔的精细度高于60000。
4.根据权利要求1所述的装置,其特征在于,所述目标分子同位素的能级包括:
双光子能级和单光子共振能级;
所述单光子共振能级位于所述双光子能级之间的中间区域。
5.根据权利要求1所述的装置,其特征在于,经过所述激光锁定模块处理后的所述激光的频率为所述目标分子同位素的能级差的二分之一。
6.根据权利要求1所述的装置,其特征在于,所述高精细度光腔的温度的波动幅度小于10mK。
7.根据权利要求1所述的装置,其特征在于,所述样品室还包括:温控单元;
所述温控单元用于控制所述高精细度光腔的温度。
8.根据权利要求1所述的装置,其特征在于,所述信号探测模块包括:灵敏探测单元和低噪声信号放大单元;
所述灵敏探测单元和所述低噪声信号放大单元为一体化集成单元;
所述灵敏探测单元用于探测所述高精细度光腔透射出的所述目标分子同位素的光强,得到双光子吸收信号;
所述低噪声信号放大单元用于放大所述双光子吸收信号。
9.根据权利要求1所述的装置,其特征在于,所述信号处理模块包括:信号处理程序和交互界面;
所述信号处理程序用于对所述双光子吸收信号进行分析处理,得到所述目标分子同位素的浓度;
所述交互界面用于显示所述目标分子同位素的浓度。
10.一种光谱仪,其特征在于,所述光谱仪包括权利要求1-9任一项所述的双光子法定量检测二氧化碳同位素的装置。
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