New Fingerprint Technology Developed
文章来源:未知 文章作者:meng 发布时间:2009-10-28 05:48 字体: [ ]  进入论坛
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Los Alamos National Laboratory scientists are using a new technique to see fingerprints2 on surfaces that typically make them invisible.

The method uses a technology called mini-X-ray fluorescence(X射线荧光光谱仪) to detect chemical elements in fingerprints without altering them, said Christopher Worley, a scientist on the project.

"The conventional methods are meant to bring out fingerprint1 patterns with regular light and they have to treat those with powder, which alters them," Worley said. "With this you don't have to alter it or treat it at all. We can determine the elements in a fingerprint and get a pattern at the same time."

The technology focuses a tight beam of X-rays on surfaces with fingerprints and creates a computer picture out of those scans.

The equipment costs about $175,000.

For big labs, the method could be a great way to bring out prints that can't be seen any other way, said Vahid Majidi, another lab scientist.

"The technique fills a unique niche," Majidi said. "These are prints that would otherwise be useless. If you have prints on a dark surface, for example, they really don't develop well using normal techniques. If you have prints from an adolescent or child, the chemicals in the fingertips are different and don't stick around long enough for traditional methods."

The new method might also be able to tell if the person that left them handled certain types of bomb-making materials, said George Havrilla, another lab scientist.

"This is a new approach to fingerprint visualization," Havrilla said. "We're lifting prints, but instead of looking at the finger's natural oils and organic residues3(有机残留物) we're looking at elemental features left behind."

The technology for scanning the prints is widely available. What's new is the method the lab has created to see them which includes computer software and ways of manipulating the machinery4, Worley said.

But the technique isn't for everyone.

"We've already had some negative comments on it," Havrilla said with a laugh. "One reviewer told us it's just not practical. But the goal of our work was to demonstrate that it was feasible(可行的) to see these things."

美国洛斯阿拉莫斯国家实验室的科学家们采用了一种新技术,可以观察到原本很难在物体表面上看见的指纹。

参与该科研项目的科学家克里斯托弗·沃尔利说,该方法使用了一种“微X射线束荧光技术”,可以探测到指纹携带的化学成分,却不会改变指纹的保存状态。

沃尔利说:“传统的方法是通过常规光线使指纹显示出来,而且要借助粉末等物质,这会改变指纹保存状况。有了这种新方法,你根本用不着改变或处理指纹了,我们可以测定指纹所含的化学成分,同时获取指纹图案。”

这项技术将一束密集的X光对准留有指纹的物体表面,并根据扫描结果创建出计算机图像。

这套设备造价17.5万美元。

该实验室的另一位科学家瓦希德·马吉德表示,对那些大实验室来说,这是获取用其他方法看不到的印迹的最好方法。

马吉德说:“这项技术填补了一项空缺。假如没有这项技术,某些印迹就会变得毫无意义。比如说,假如是深色表面上的指纹,普通技术确实无法精确地探测到它们;假如是青少年或小孩的指纹,他们的指尖留下的化学成分(和成人)是不同的,而且这些指纹附着在物体表面的时间并不久,因此不适宜使用传统的分析方法。”

该实验室的另一位科学家乔治·豪夫里洛表示,这种新技术也许还能检测出指纹所有者是否触摸过某些类型的炸弹制造材料。

豪夫里洛说:“这是清楚显示指纹的一种新途径。我们查找印迹时不再只观察手指分泌的油脂和残留有机物,而是专注于其背后隐藏的非凡化学成分。”

沃尔利指出,扫描印迹的技术目前已被广泛采用。该实验室发明的这种新型指纹探测法的创新之处在于它包含了计算机软件技术和机器操作方法。

但是这一技术也并非众人皆宜。

豪夫里洛笑着说:“我们已经收到了一些负面评论。一位批评者对我们说它压根不实用。但我们工作的目标是证实这种技术是切实可行的。”



点击收听单词发音收听单词发音  

1 fingerprint 4kXxX     
n.指纹;vt.取...的指纹
参考例句:
  • The fingerprint expert was asked to testify at the trial.指纹专家应邀出庭作证。
  • The court heard evidence from a fingerprint expert.法院听取了指纹专家的证词。
2 fingerprints 9b456c81cc868e5bdf3958245615450b     
n.指纹( fingerprint的名词复数 )v.指纹( fingerprint的第三人称单数 )
参考例句:
  • Everyone's fingerprints are unique. 每个人的指纹都是独一无二的。
  • They wore gloves so as not to leave any fingerprints behind (them). 他们戴着手套,以免留下指纹。 来自《简明英汉词典》
3 residues 3e5a3e323766c2626c2be0d6feafa1da     
n.剩余,余渣( residue的名词复数 );剩余财产;剩数
参考例句:
  • pesticide residues in fruit and vegetables 残留在水果和蔬菜中的杀虫剂
  • All organic and metallic residues on the wafers must be removed. 片子上所有的有机和金属残留物均必须清除。 来自辞典例句
4 machinery CAdxb     
n.(总称)机械,机器;机构
参考例句:
  • Has the machinery been put up ready for the broadcast?广播器材安装完毕了吗?
  • Machinery ought to be well maintained all the time.机器应该随时注意维护。
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