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黑光灯能激发哪些物质发光?

作者:紫外光源事业部时间:2019-12-28 10:38:36浏览454 次

信息摘要:

犯罪现场调查人员通过使用黑光灯以及有时使用附加的喷洒化学剂来寻找干燥和清理后的血迹,以寻找犯罪证据。在黑光灯下,血液会变成黑色,除非喷洒了使它发蓝光的鲁米诺。当被黑光照射时,唾液,精液和尿液也会发光。大多数生物流体都含有荧光分子以帮助它们发光。

黑光灯能激发哪些物质发光?

生物液
犯罪现场调查人员通过使用黑光灯以及有时使用附加的喷洒化学剂来寻找干燥和清理后的血迹,以寻找犯罪证据。在黑光灯下,血液会变成黑色,除非喷洒了使它发蓝光的鲁米诺。当被黑光照射时,唾液,精液和尿液也会发光。大多数生物流体都含有荧光分子以帮助它们发光。在Fido排尿的地方搜寻时,请在暗室中使用黑光灯查找并清洁它,而不是用鼻子。

由于诸如精液,唾液和阴道液之类的体液是天然荧光的,因此使用光源提供了一种独特的定位方法。犯罪现场调查人员可以缩小污渍的特定位置以进行收集,而不必测试整个大块的证据,例如床垫,地毯,床单,衣服等。光源照明。因为几乎所有体液都固有地具有荧光性,所以光源越强大,越可调,您就会发现更多的证据。尽管体液在普通的紫外线黑光下会发出荧光,但是许多您会发现其上的物品(包括衣服和床单)也会发光并阻碍其检测。因此,有必要调谐到可见波长(色带)以消除背景干扰。考虑到您将在引人注目的重大犯罪案件中寻找体液,以及DNA使用的增加扩散,您可以揭示的体液证据越多越好。

洗衣用品
某些洗衣用品中含有荧光物质。通常,制造商添加荧光剂以使其比亮白色更亮。清洁剂残留物或溢出物可能不会留下可见的污渍,但是当受到黑光灯照射时,它们会发出诡异的蓝色光芒。洗衣粉中的这些元素也可能导致照片中的白色衣物看起来呈蓝色阴影。

维生素,有毒油和隐形墨水
在黑光灯下发光的其他物质或溢出物包括车辆内使用的防冻剂。如果防冻剂吸收了宠物,则会对宠物造成伤害,因此,如果车库中有任何需要排泄物的溢出物,那么黑光灯就可以解决问题。一位研究人员开发了一种获得的喷雾剂,当该喷雾剂用于黑光衣服时,可以检测到源自毒橡树和有毒常春藤植物的有毒油漆酚,可导致身体发痒的皮疹。由柠檬汁制成的不可见油墨在黑光的光度下变得易于阅读。洒落和压碎的维生素可能不会留下污渍,并且可能会消失在地毯中,除非您对它们施加黑光以清洁该区域。

精液在黑光灯下发光

What Kind of Invisible Stains Do Black Lights Detect?
Vitamins, Toxic Oils and Invisible Ink
Other substances or spills that glow beneath a black light include the antifreeze used inside a vehicle. Antifreeze harms pets if they ingest it, so if you have any spills in the garage that require ferreting out, a black light does the trick. A researcher developed a patented spray that when used on clothing with a black light can detect the toxic oil urushiol derived from poison oak and poison ivy plants that leads to an itchy rash on the body. Invisible inks made from lemon juice become easy to read beneath the luminosity of a black light. Spilled and crushed vitamins may not leave a stain and may disappear into the carpet unless you apply a black light to them to clean the area.

Biological Fluids
Crime scene investigators hunt for evidence of a crime by using a black light and sometimes an added sprayed-on chemical to locate dried and cleaned up blood stains. Beneath a black light, blood turns black, unless sprayed with luminol which gives it a blue-glow. Saliva, semen and urine also glow when hit with a black light. Most biological fluids contain fluorescent molecules to help them glow. When hunting down that spot where Fido urinated, use a black light in a dark room to find and clean it instead of your nose.

Laundry Supplies
Certain laundry supplies contain fluorescent materials within them. Generally, manufacturers add fluorescers to make them brighter than bright white. Detergent residues or spills may leave no visible stain, but when subjected to the rays of a black light, they glow with an eerie blue glow. These elements within laundry detergents may also cause white clothing in photographs to appear as a shade of blue.

 


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