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| 品牌 |
ABB |
型号 |
GJR2311200R1 |
| 类型 |
DCS |
性能 |
即插即用 |
| 适用范围 |
工业 |
加工定制 |
否 |
| 是否进口 |
是 |
|
元素分析是一种材料科学和分析化学过程,用于确定材料样本的元素组成,例如水、矿藏或人体液体。定性和定量元素分析是元素分析的两种形式。元素的种类通过定性检查确定,而元素的水平/数量通过定量分析确定。
为什么元素检查是必不可少的
对调查期间发现的物品进行基本检查可能会提供有关其起源和历史的重要信息。然而,由于物品本身可能需要作为证据提供,因此用于该检查的任何方法都应该是非破坏性的。样品类型和尺寸范围很广,从土壤样品到再到枪击残留物或玻璃碎片的微小颗粒。
元素分析可以为法医科学家提供丰富的证据。然而,提供给检查的样本可能几乎是任何东西,从散装材料到微小碎片。
元素分析的技术
非破坏性技术是有益的,因为保留样本以作为物理证据。EDXRF 是为数不多的具有灵敏度和元素范围的分析方法之一,可以进行许多此类研究,而无需溶解或以其他方式篡改材料。
SPECTRO Analytical Instruments 和 EDAX 的 EDXRF 机器变体旨在处理广泛的样品类型,并且可以进行法医调查中使用的大部分元素分析。SPECTRO Analytical Instruments 的 ICP-OES 和 ICP-MS 光谱仪可在需要更高灵敏度时提供的方法。
激光烧蚀
激光烧蚀或光烧蚀是通过用激光束轰击从固体(或偶尔为液体)表面去除材料的过程。吸收的激光能量加热材料,材料在低激光通量下溶解或蒸发。使用高强度激光,该物质通常会转化为等离子体。
哪些激光器用于消融?
激光烧蚀通常是指使用脉冲激光进行剥离,但是如果激光输出足够高,则可以使用高频激光束烧蚀材料。虽然相当长的激光脉冲可以燃烧和破坏处理过的材料,但由于超短光与物质的相互作用,超短激光脉冲在计算过程中只会造成轻微的破坏,使其也适用于微材料加工。
从固体表面有规律地去除材料是激光烧蚀的最基本用途。激光铣削,尤其是激光钻孔,是脉冲激光器如何在极其坚硬的材料上钻出极其细小、深邃的沟槽的例子。由于非常短的激光脉冲可以如此快速地去除材料,因此周围材料接收的热量非常少,因此激光钻孔可用于牙釉质等易损或热敏材料(激光牙科)。
一些研究人员使用激光烧蚀和气体冷凝技术制造了金属纳米颗粒、无机材料和金属碳化物。激光清洗还用于修复绘画、雕塑和壁画,以及去除铁器遗物的锈迹,清除各种表面的油或油脂,以及去除古代文物上的锈迹。由于模具的表面损伤最小,激光烧蚀是清洁橡胶模具的方法之一。
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Non-destructive techniques are beneficial since it is preferred to maintain the sample for presenting as physical evidence. EDXRF is one of the few analytical methods with the sensitivity and elemental range to conduct many of these studies without requiring the material to be dissolved or otherwise tampered with.
The variants of EDXRF machines from SPECTRO Analytical Instruments and EDAX are intended to handle a broad range of sample types and can conduct the bulk of elemental analyses used in forensic investigations. SPECTRO Analytical Instruments' ICP-OES and ICP-MS spectrometers provide the very latest state-of-the-art methods when greater sensitivity is needed.
Laser Ablation
Laser ablation or photoablation is the process of removing material from a solid (or occasionally liquid) surface by bombarding it with a laser beam. The ingested laser energy heats the material, which dissolves or vaporizes at low laser flux. Using a high-intensity laser, the substance is often converted to plasma.
Which Lasers are Used for Ablation?
Laser ablation normally refers to peeling with a pulsed laser, however, it is viable to ablate material with a high-frequency laser beam provided the laser output is high enough. While reasonably long laser pulses can burn and destroy the treated material, ultrashort laser pulses cause only slight destruction during computation due to the ultrashort light-matter interaction, making them suitable for micromaterial processing as well.
Industrial Uses of Laser Ablation
The regulated removal of material from a solid surface is the most fundamental use of laser ablation. Laser milling and, in particular, laser drilling, are examples of how pulsed lasers can drill incredibly small, deep trenches through incredibly hard materials. Because very short laser pulses remove material so quickly so that the surrounding material receives very little heat, laser drilling may be used on delicate or heat-sensitive materials like tooth enamel (laser dentistry).
Metallic nanoparticles, inorganic materials, and metal carbides have been created by several researchers using laser ablation and gaseous condensation. Laser cleaning is also used to repair paintings, sculptures, and frescoes, as well as to eliminate rust from iron relics, clean oil or grease from various surfaces, and erase rust from ancient artifacts. Laser ablation is one of the preferred ways of cleaning rubber molds due to the mold's minimal surface damage.