CN104914094B - 对安全物品的光吸收及发射特性的气体激活改变 - Google Patents
对安全物品的光吸收及发射特性的气体激活改变 Download PDFInfo
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Abstract
本申请涉及对安全物品的光吸收及发射特性的气体激活改变。本发明揭示安全物品及用于使用多个刺激来鉴定安全物品的方法及系统。根据一个实施例,说明性安全特征包括通过同时存在电磁辐射源及特定气体环境而激活磷光或荧光材料。检测器检测由气体环境的变化引起的所述安全特征的光谱发射。可将所述光谱发射与所期望的发射图形进行比较以确定所述安全物品的真实性。
Description
本申请为申请号为201180012703.0、申请日为2011年2月4日、发明名称为“对安全物品的光吸收及发射特性的气体激活改变”的发明专利申请的分案申请。
相关申请案
本申请案主张2010年2月4日申请的第USSN 61/301,340号临时申请案的优先权,所述临时申请案的揭示内容以全文引用的方式并入本文中。
技术领域
本发明涉及安全物品,且更明确来说,涉及具有在暴露于特定气体环境后即刻改变的光吸收及发射特性的安全物品。
背景技术
仿造和伪造已成为现代经济及市场中的重要关注对象。计算技术及印刷技术的进步已提高了伪造、仿造文档及其它欺诈活动的发生率。今天的高科技社会中的数不清的领域需要且依赖价值很高的文档、公文、货币及其它材料的证明、鉴定及保护。因此,需要将安全标记并入到货币、重要文档、包装及其它真实材料中,以防止未经授权的复制、伪造、仿造及其它欺诈使用。
虽然例如仿造货币及伪造签名或笔迹等欺诈活动是常见的,但随着尖端计算机印刷及处理的出现,产生及完善伪造及仿造文档的方法已变得更容易且更可用。早在1991年,美国财政部已连续地将安全防卫特征添加到货币的票面中,以力图与伪钞的使用作斗争。这些防卫已包括水印、嵌入在纸币中的安全线、微印刷、变色油墨及多着色钞票的使用。
当前鉴定货币的方法涉及外观观察、在紫外线灯下进行扫描、使纸币含有安全线及发射性材料(例如,油墨及金属片(planchette))。此类安全线响应于向紫外线光的暴露而发射明显的标记、色彩或代码。在一些情形下,不同面额的纸币的发射特征可发射不同的色彩。除发射的色彩之外,当纸币暴露于紫外线光或某一形式的激发时,肉眼可检测到代码编号或其它唯一识别符。
安全物品(例如,有价值的文档或材料)的鉴定影响经济的许多方面。公证人使用凸出的图章来鉴定被公证的文档。反过来,驾驶证、护照及其它照片证明含有全息图及微印刷。类似地,体育纪念物及零售衣商使用全息标签及图章来证明真实性。甚至时尚设计师现在也正在其服饰中包括鉴定装置以防止将仿制品假冒为设计师产品。
举例来说,如果仿造者知道在钞票中有安全线或在文档中有水印,那么安全特征的复制将变得更容易。一旦使特征被知晓,仿造者就可开始开发特定策略及解决方案来克服由所述特定特征提供的安全保护。
因此,需要进一步降低仿造者的成功可能性的安全特征,即使他们知道所述安全特征的存在也是如此。
发明内容
本发明的实施例包括安全物品及用于使用多个刺激来鉴定安全物品的方法及系统。根据一个实施例,说明性安全特征包括通过同时存在电磁辐射源及特定气体环境来进行的磷光或荧光材料的激活。因此,所述辐射及气体用作第一及第二刺激。
安全物品(例如,本文中描述的安全物品)可能需要一个以上刺激(例如,光及气体环境两者的施加)来检测鉴定特征。此外,此类安全物品可具有可公开使用、秘密使用或既可公开使用又可秘密使用(即,具有用于公开获取的第一响应及用于秘密使用的第二响应)的安全特征。
在一个实施例中,本发明涉及安全物品。所述安全物品可包括主体材料,所述主体材料包含并入在主体材料上或主体材料内的气体激活安全特征,其中所述气体激活安全特征能够发射光谱发射,所述光谱发射在向气体激活安全特征的气体环境中的变化暴露后即刻改变。所述主体材料可包括聚合物。所述主体材料可包括响应性部分及非响应性部分,其中所述气体激活安全特征可并入在所述响应性部分上或所述响应性部分内。所述主体材料可包括参考安全特征。在此情况下,所述安全特征及所述参考安全特征可在向气体环境中的变化暴露后即刻发射不同的光谱发射。并且,在此情况下,所述安全特征及所述参考安全特征可在向气体环境中的变化暴露后即刻发射等效的光谱发射。所述气体激活安全材料可包括选自由荧光材料及磷光材料组成的群组的材料。所述气体激活安全特征可包括选自由铂(II)或钯(II)卟啉、铂(II)或钯(II)酞花青或萘酞菁、三联吡啶钌(II)类型复合物、铽(III)混合复合物、苝系染料、羟比三磺酸、理查德染料(Reichardt′s dye)或其组合组成的群组的材料。所述气体激活安全特征可并入在选自由油墨、涂层、安全线、金属片、颗粒、全息图及窗口化区组成的群组的载体上或载体内。
在另一实施例中,本发明涉及一种鉴定安全物品的方法。所述方法可包括以下步骤:将电磁辐射指引到包含气体激活安全特征的安全物品;起始所述安全特征的气体环境的变化;及检测由气体环境的所述变化引起的安全特征的光谱发射。所述起始安全特征的气体环境的变化的步骤可包括从安全特征的第一气体环境移除气体或将气体注射到安全特征的第一气体环境中,以形成安全特征的第二气体环境。所述方法可进一步包括将光谱发射与所期望的光谱发射进行比较以确定所述安全物品的真实性的步骤。所述方法可进一步包括测量所述光谱发射的时间响应的步骤。所述方法可进一步包括使安全特征的光谱发射从原始状态改变为气体激活状态的步骤。所述方法可进一步包括使所述安全特征的光谱发射从气体激活状态改变为原始状态的步骤。
在进一步的实施例中,本发明涉及一种用于鉴定安全物品的检测器系统。所述系统包括电磁辐射源,其用于将电磁辐射指引到包含气体激活安全特征的安全物品;气体环境源,其用于起始气体激活安全特征的气体环境的变化;及检测器,其用于检测由气体环境的所述变化引起的气体激活安全特征的光谱发射。所述电磁辐射源可包括选自由红外线、可见光及紫外线组成的群组的波长。所述气体环境源可提供一种气体环境,其选自由惰性气体、水蒸气、氧气、二氧化碳、化学蒸气及人类呼吸组成的群组。所述气体环境源可通过压力或密度的变化或通过真空的施加来提供气体环境。所述检测器系统可进一步包括气体环境更改装置,其从所述气体环境移除气体或将气体注射到所述气体环境中。所述检测器可为光谱仪。
附图说明
根据以下详细描述及附图,将易于理解本发明的这些实施例及其它方面,所述详细描述及附图意在说明而非限制本发明,且其中:
图1为本发明的说明性实施例,其展示根据本发明的实施例的安全物品、电磁辐射源、气体环境源及检测器;
图2为根据本发明的实施例的安全物品的光谱发射的说明性图表;
图3描绘根据本发明的实施例的气体环境向安全物品的施加;以及
图4为根据本发明的实施例的安全物品的光谱发射的说明性图表。
具体实施方式
将通过以下详细描述来更完整地理解本发明,所述详细描述应结合附图阅读。本文揭示本发明的详细描述,然而,将理解,所揭示的实施例仅为本发明的示范,本发明可以各种形式体现。因此,本文所揭示的特定功能细节不应被解释为限制性的,而仅作为所附权利要求书的基础,且作为用于教示所属领域的技术人员在实际上任何适当详述的实施例中以各种方式使用本发明的代表性基础。
本发明的实施例包括在施加特定气体环境后即刻来自安全物品的荧光或磷光发射。具体来说,特定气体的施加揭露安全物品的唯一光谱图形。在一个实施例中,将安全物品暴露于气体激发(即,特定气体环境)显露了可通过其鉴定安全物品的唯一光谱发射。根据本发明的实施例,对安全物品的激发可包括可见环境光或太阳光,或可包括其它光或电磁源(例如,紫外线源或红外线源)。
安全物品可被暴露至的特定气体环境可包括响应性气体部分(其能够引起对安全特征的吸收或激发的改变)及非响应性气体部分(其不引起对安全特征的此响应)。根据本发明的一个实施例,用于激发的气体可为无毒、安全暴露气体,例如惰性气体。根据其它实施例,响应性气体部分可包括水蒸气、氧气、二氧化碳或其它化学蒸气或人类呼吸,相比于大气,其具有大为降低的氧气水平。此外,响应性气体部分可为气体环境的变化(例如,压力或密度变化(例如,通过产生真空))的结果。
所述安全物品可包括一种或一种以上气体敏感材料,其可安置在可渗透主体材料(例如,聚合物材料)上或可渗透主体材料(例如,聚合物材料)内。所述安全物品的气体敏感材料可为文档或钞票中的油墨、涂层、安全线、金属片、颗粒、全息图或窗口化区的一部分。取决于气体环境,所述安全物品的发光光谱可从紫外线延伸到红外线。气体敏感材料的激发响应为所使用的分子类型、所述材料到主体材料的接合能力及所述材料到主体材料的各种气体成分的渗透性的结果。
气体敏感材料的吸收特性随着向特定气体环境的暴露而变化。吸收特性的变化可导致气体敏感材料的可见色彩的变化。除环境光或太阳光之外或代替环境光或太阳光,吸收特性的变化可在施加或不施加光源或电磁辐射源的情况下产生。气体敏感材料的光发射或色彩可在以来自电磁源(例如,紫外线、可见光或红外线)的刺激激发后即刻改变。因此,可通过测量安全特征的光谱发射的强度或其变化来确定安全物品的真实性。
此外,所述气体敏感材料可具有以下特性:其在来自电磁源的刺激后即刻改变色彩,且具有由气体环境确定的驰豫或变回到其原始色彩的速率。换句话说,所述气体敏感材料的光发射可具有取决于特定气体环境或对所述气体环境的改变的寿命。气体激活安全特征可处于:(1)施加电磁辐射及/或气体环境之前的原始状态,(2)与施加电磁辐射及/或气体环境同时或在施加电磁辐射及/或气体环境之后的气体激活状态,或(3)在施加电磁辐射及/或气体环境之后恢复到原始状态。光谱发射可在原始、激活及恢复状态中不同地响应。因此,还可通过测量荧光寿命(即,安全特征的光谱发射的时间响应或其变化)来确定安全物品的真实性。
一种用于分析安全物品中的安全特征的检测器系统可包括:电磁或光激发源、用于吸收、色彩或发射的光谱检测的装置及气体环境更改装置(例如,来自气体源的泵、喷嘴或喷射器)。所述气体环境更改装置可将空气从安全物品周围吸走,或可将特定气体成分吹到安全物品上。或者,所述气体环境更改装置可包括用于将人类呼吸吹到所述物品上的麦管状装置。所述检测器系统还能够(例如)相对于光或气体环境的周期性激发而测量安全物品的光谱变化的相位响应的时间响应。
安全物品的光谱发射可用于识别及证明所述物品的真实性。可通过将特征的强度展示为波长的函数来说明光谱发射。来自典型安全特征的光谱发射跨越波长谱而产生具有可检测特性或图案的图形。根据本发明的一个实施例,增强所述安全特征,使得所述特征的激发产生可经分析以证明真实性的明显的光谱图案。如果在扫描含有所述特征的物品的光谱发射后,所期望的发射图形不与所期望的图形匹配,那么所述物品可能为伪造品或可能已被篡改。如果所述图形与所期望的图案或值匹配,那么所述文档可能为真实的。
图1为本发明的说明性实施例,其展示安全物品、电磁辐射源、气体环境源及检测器。安全物品2具有并入在主体材料6上或主体材料6内的气体激活安全特征4。电磁辐射源8将电磁辐射指引到具有气体激活安全特征4的安全物品2。气体环境源10起始安全特征4的气体环境的变化。检测器12检测由气体环境的变化及/或同时或随后的向电磁辐射的暴露引起的光谱发射14。
图2展示根据本发明的实施例的安全特征的光谱发射图形。具体来说,图2描绘作为波长的函数的来自两种激发形式-一种光学形式,一个光学及气体形式-的发射响应的强度。第一光谱图形16为安全特征的光学激发的结果;光学激发的施加在某些波长上产生较高的发射。第二光谱图形18由同时通过光学及气体暴露进行的安全特征的激发引起。如图2的图表中所展示,包括特定气体环境的激发的光谱图形产生显著较高的发射响应。作为鉴定过程的一部分,检测器系统(例如,光谱仪)可容易地读取较高强度的安全物品的发射。
图3描绘光学及气体激发向磷光材料的施加。当向紫外光或另一类型的电磁辐射及来自喷射器19的特定气体暴露时,磷光材料20在光及气体被施加到的区λ中展现可检测的强度21。
根据本发明的另一实施例,双激发材料或涂层可包括在现有磷光或荧光发射安全特征内。图4描绘根据本发明的实施例的光谱图表(强度对波长)。第一光谱图形22展现光学及气体激发之下的唯一图形。举例来说,发色团的第一光谱发射在给定波长下产生具有唯一且可界定特征的图形。在图4展示的实例中,光谱发射中的下降(吸收)及峰值(发射)在某些波长下发生。这些下降及峰值对于人类眼睛是不可检测的;然而,所述特征是机器可读的,仅需要使用光谱仪或其它检测器系统。第二光谱发射24展示气体环境的非响应性部分的作用,从而突出额外的光谱图形,即,在光谱图形22中施加光学及气体激发后即刻获得的可测量且可量化的光谱位移。
根据本发明的实施例,机器可检测安全特征包括在安全物品(例如,文档、货币或用于例如,香烟、奢侈品或药品等商品的第二包装)中。安全特征可(例如)嵌入在安全线、金属片内或作为油墨的一部分,从而在使用紫外线源或灯或其它适当激发源观察时,产生所述线的经激发图形的可见变化。然而,特定气体环境的施加可导致安全特征的色彩变化以及可测量且可量化的光谱位移,如图4中所展示。所述安全特征虽然在某些情形下是肉眼不可检测的,但在特定气体环境中在光学及气体激发下发射特定及明显色彩以及唯一的光谱指纹。不同磷光剂的选择导致不同的色彩及光谱发射。可在没有对经激发发射图形的公众认知的任何改变的情况下实施机器可读、秘密特征的并入,从而使文档的伪造或复制更困难。
存在可在向特定气体环境暴露后即刻展现电磁辐射发射的增加或减少、强度变化、荧光或其它可检测变化的各种类别的化合物。举例来说且不限制,在一个实施例中,以下类别的化合物可在氧气环境或其它气体环境中经气体激活:铂(II)或钯(II)卟啉;铂(II)或钯(II)酞花青或萘酞菁;三联吡啶钌(II)类型复合物;铽(III)混合复合物及苝系染料。举例来说且不限制,在另一实施例中,以下类别的化合物可在二氧化碳环境或其它气体环境中经气体激活:湿聚合物或凝胶媒介中的羟比三磺酸(“HPTS”)。举例来说且不限制,在进一步实施例中,以下类别的化合物可在水环境或其它类型的环境中经气体激活:三联吡啶钌(II)类型复合物;苝系染料;及理查德染料。在一个实施例中,水敏感吸收剂可用于选择性地阻碍来自不受水影响的荧光染料或其它类型的染料的吸收或发射。
虽然本文揭示的本发明的实施例描述在光及气体源的激发下的发射特征的检测,但所属领域的技术人员应认识到,气体敏感材料的吸收性质的优势可用作安全特征。举例来说,根据本发明的另一实施例,安全特征可包括磷光材料,所述磷光材料在光学激发之下在某些波长下具有吸收性光谱响应。将气体激发施加到所述材料导致所述材料的发射强度的恢复。
虽然本文揭示的本发明的实施例描述基于对激发源的特定响应的检测,但所属领域的技术人员应认识到,在不脱离本发明的范围的情况下,可并入额外参数,例如,发射的暂时性衰变、主体的光谱图形及气体激发之下的响应时间及发射的变化。
本发明的方面、实施例、特征及实例应在所有方面都被认为是说明性的,且无意限制本发明,本发明的范围仅由所附权利要求书界定。在不脱离所主张的本发明的精神及范围的情况下,其它实施例、修改及使用对于所属领域的技术人员将是显而易见的。
在申请案中使用标题及章节不希望限制本发明;每一章节可适用于本发明的任何方面、实施例或特征。
在整个申请案中,在组合物被描述为具有、包括或包含特定成分的情况下,或在过程被描述为具有、包括或包含特定过程步骤的情况下,预期本发明教示的组合物也实质上含有或含有所引述的成分,且本发明教示的过程也实质上含有或含有所引述的过程步骤。
在本申请案中,当元件或组件被称为包括在所引述的元件或组件的列表中及/或选自所引述的元件或组件的列表时,应理解,所述元件或组件可为所引述的元件或组件中的任何一者,且可选自由所引述元件或组件中的两者或两者以上组成的群组。此外,应理解,本文描述的组合物、设备或方法的要素及/或特征可以多种方式加以组合,而不脱离本发明教示的精神及范围(不管是明确的还是暗含在其中)。
术语“包括”或“具有”的使用一般应被理解为是开放式的且无限制的,除非另有明确陈述。
本文中的单数形式的使用包括复数形式(且反之亦然),除非另有明确陈述。此外,单数形式“一”及“所述”的使用包括复数形式,除非上下文另有清楚指示。此外,在术语“约”的使用在数量值之前的情况下,本发明教示还包括其自身的特定数量值,除非另有明确陈述。如本文中所使用,术语“约”指代从标称值的±10%的变化。
应理解,步骤的次序或用于执行某些动作的次序是无关紧要的,只要本发明教示保持可操作即可。此外,可同时进行两个或两个以上步骤或动作。
在提供值的范围或列表的情况下,个别预期所述值的范围或列表的上限与下限之间的每一介入值且包含在本发明内,就像每一值在本文中经明确列举那样。此外,预期在给定范围的上限与下限之间且包括给定范围的上限及下限的较小范围且包含在本发明内。示范性值或范围的列出不是在给定范围的上限与下限之间且包括给定范围的上限及下限的其它值或范围的放弃声明。
虽然已参考说明性实施例描述了本发明,但所属领域的技术人员将理解,可做出各种其它改变、省略及/或添加,且可以实质性等效物代替其元件而不脱离本发明的精神及范围。此外,可做出许多修改以使特定情形或材料适应本发明的教示而不脱离其范围。因此,希望本发明不限于所揭示以用于实行本发明的特定实施例,而希望本发明将包括落在所附权利要求的范围内的所有实施例。此外,除非明确陈述,否则术语第一、第二等等的任何使用不指示任何次序或重要性,而是,术语第一、第二等等用于区别一个元件与另一个元件。
Claims (13)
1.一种安全物品,其包含:
主体材料,其具有响应性部分及非响应性部分,所述主体材料包含并入在所述主体材料的所述响应性部分上或所述主体材料的所述响应性部分内的气体激活安全特征,
其中所述气体激活安全特征能够发射第一光谱发射,所述第一光谱发射在暴露于所述气体激活安全特征的气体环境的变化后即刻变化为第二光谱发射。
2.根据权利要求1所述的安全物品,其中所述主体材料包含聚合物。
3.根据权利要求1所述的安全物品,其中所述气体激活安全特征进一步被并入在物品中现存的安全特征上。
4.根据权利要求3所述的安全物品,其中所述气体激活安全特征和所述现存的安全特征在暴露于气体环境的所述变化后即刻发射不同的光谱发射。
5.根据权利要求3所述的安全物品,其中所述气体激活安全特征和所述现存的安全特征在暴露于气体环境的所述变化后即刻发射等效的光谱发射。
6.根据权利要求1所述的安全物品,其中所述气体激活安全特征包含选自由荧光材料及磷光材料组成的群组的材料。
7.根据权利要求1所述的安全物品,其中所述气体激活安全特征包含选自由铂(Ⅱ)或钯(Ⅱ)卟啉、铂(Ⅱ)或钯(Ⅱ)酞花青或萘酞菁、三联吡啶钌(Ⅱ)类型复合物、铽(Ⅲ)混合复合物、苝系染料、羟比三磺酸、理查德染料或其组合组成的群组的材料。
8.一种鉴定安全物品的方法,其包含以下步骤:
将电磁辐射指引到包含气体激活安全特征的安全物品,所述安全物品具有响应性部分和非响应性部分;
起始所述安全特征的气体环境的变化;及
检测由气体环境的所述变化引起的所述安全特征的光谱发射从第一光谱发射到第二光谱发射的变化。
9.根据权利要求8所述的方法,其中所述起始所述安全特征的气体环境的变化的步骤包含从所述安全特征的第一气体环境移除气体或将气体注射到所述安全特征的第一气体环境中,以形成所述安全特征的第二气体环境。
10.根据权利要求8所述的方法,其进一步包含将差别的光谱发射与所期望的光谱发射进行比较以确定所述安全物品的真实性的步骤。
11.根据权利要求8所述的方法,其进一步包含测量所述光谱发射的时间响应的步骤。
12.根据权利要求8所述的方法,其进一步包含使所述安全特征的所述光谱发射从原始状态改变为气体激活状态的步骤。
13.根据权利要求8所述的方法,其进一步包含使所述安全特征的所述光谱发射从气体激活状态改变为原始状态的步骤。
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CA2789355A1 (en) | 2011-08-11 |
US9189604B2 (en) | 2015-11-17 |
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BR112012020191B1 (pt) | 2019-12-31 |
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