采用太赫兹技术测量制造材料的总厚度bob综合平台
Following a successful trip toTire Tech Expo last month以下是仔细看看Terahertz测量执行按需生产材料的能力检查,以确保THz测量仍然准确。特别是通过材料批量更改,换档变化,生产停止/重启和新产品开始。
太赫兹辐射是在微波和远红外之间的电磁谱的一部分。该区域的频率范围为0.1 - 10THz,波长为3毫米至0.03mm。该光谱区域通常被称为“太赫兹差距”,因为这些频率落在电子(具有天线的场)和光学的测量)和光学(使用光学检测器的功率的测量)。从历史上看,已经进行了对这些波长和物质之间的相互作用的研究。这是难以生成和检测到太赫兹频率的原因。结合光学和电子方法的最近进步已经允许生成和检测非常高的信噪比和高数据采集率为0.1-3至3 Zt。
大多数材料,尤其是聚合物和其他马努factured materials, can be relied on to be very consistent and thus have the same material properties. In tire manufacturing, gum rubber is a relatively unusual material in that it is derived from many sources, both natural rubber sources and recycled material sources. Thus, consistency in the exact formulation of the rubber product is difficult to guarantee. Tire manufacturers undertake extensive multiple processing steps to ensure the material is uniform, but small changes in the mixed material properties are possible.
对于厚度bob综合平台测量,最重要的属性是材料的折射率(RI)。虽然该术语听起来复杂,但它只是光速(真空)与THz脉冲的速度(通过材料)的速度之比。电磁能量(即,Light)总是在通过物质时慢下来。对于一致的材料(例如,聚合物),RI值的测定需要不到2分钟,并且只需要完成一次。
但是,担心这种财产价值可能因天然产品而异。该值的变化将导致准确性错误。因此,需要在生产的确切材料上实时在线进行该2分钟检查。对于THz,有一种简单的方法来做。
By adding a window between the sample and the sheet and a metal reflector behind the sheet, it is possible to make two THz measurements (one of the empty structure, and one when the sheet is present) to determine the sheet total thickness without needing any calibration. From these two measurements it is straightforward to find the instantaneous value for RI for the product being manufactured.
The Empty structure needs to be measured to calculate the “thickness” of the air layer between the window bottom and rear reflector surface (TotAir). This value needs to be stored.
When the structure moves on sheet, then two air layers are created; one between the window and sheet (TopAir) and one between the sheet and rear reflector (BotAir).
然后,样bob综合平台品的厚度:
样品厚度= Tbob综合平台otair - Topair - Botair
因此,现在已知样品的bob综合平台厚度而没有任何知识的样品材料特性。从该厚度值,可以立即bob综合平台计算折射率。利用RI值,获得了保证的精确厚度测量。bob综合平台该结构在扫描框架上设置,可以按需或按照运营商设置的按需运行。
讨论的其他主题被认为是用帘布层的绳索间距的测量,尤其是从最后一根绳索到牙龈板边缘的距离。这将是THz检查的新申请,现在正在考虑。
For more information on howTerametrix.正在使用Terrahertz技术在轮胎制造中请下载我们的应用笔记calendering。