Extrusion Asia Edition 1-2016

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过去的几年中，对于毫米波波段频率的计量学应用
研究，使毫米波的应用在测量精度方面取得了巨大的突
破。尽管如此，对圆柱状产品的涂层厚度测量还是难以
达到理想水平。随着最具创新的CENTERWAVE 6000
推出，SIKORA让可靠测量所有类型德标管材的尺寸、
外径、椭圆度、壁厚成为可能。
最新毫米波技术的优势
即使没有挤出材料的性能和温度信息，CENTER-
WAVE 6000也可在圆周上通过多点测量外形与壁厚，
其准确性为此前其它检测方法所无法企及。该技术也可
应用于多层管的精确测量。
该测量系统通过在管材的圆周放置多个传感器
（收发器），持续发送和接收调频的毫米波。管材的边
界层，比如塑料的正反面会反射这些波，从而被相应的
接收单元检测到并且解调。这些接收到的信号包含了不
同材料边界层相邻距离的信息。各个传感器接收到信号
后，通过一系列的计算，在极短的时间内所需要的测量
数值就可以显示出来。这些测量数值可以用于挤出生产
线上管材不同层面尺寸的控制。
取代传统技术
对于研发这样一个以CW-毫米波芯片为基础的测量
技术，其决定性的目标在于为管材挤出生产线提供免维
护且耐用的非接触式测量。由于不需要考虑材料的特
性，CENTERWAVE 6000可以得到极精确的测量数
值，无需针对不同的材料进行参数设置。
CENTERWAVE 6000的推出旨在提供生产线不同
位置（即使是在热态）的高精度测量值，并且不需要耦
合介质，不受温度影响，无需校准。
产品系列
目前开发的两种独立的测量头分别适用于外径范围
120-400mm和250-1000mm的产品。搭配ECOCON-
TROL 6000显示处理系统，可提供数值显示和截面的
图形显示，同时包含趋势图和统计图表等功能。另外，
还可以通过虚拟测量头的功能计算挤出机位置的测量
值，有效帮助生产线管理人员第一时间做出优化调整。
即便挤出位置和测量位置的延迟时间较长，也能够保证
有效并且快速地控制壁厚，减少过多的材料损耗。
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Extrusion Asia Edition 1/2016
During the last years, enormous successes regarding measur-
ing accuracy were achieved by researching metrological ap-
plications with frequencies in the millimeter waves range. Ne-
vertheless, the results could not yet be used for the coating
thickness measurement of cylindrical products. With the novel,
innovative measuring system, the CENTERWAVE 6000, SIKORA
creates completely new preconditions for the reliable measure-
ment of the nominal size as well as the outer diameter, ovality
and wall thickness of all kinds of extruded DIN-tubes.
Advantages of the new millimeter waves technology
Even without any knowledge of the properties of the extruded
materials and its temperatures, the CENTERWAVE 6000 mea-
sures the outer contour as well as the wall thicknesses simulta-
neously at several places of the circumference, providing a pre-
cision to a previously unknown degree. Layer thicknesses of
multi-layer tubes can also be measured precisely.
Several sensors, so-called transceivers, arranged around the cir-
cumference of a tube, continuously send and receive frequency
modulated millimeter waves. Boundary layers, as for example
each front and back site of a plastic, reflect these waves, which
are detected and demodulated by the receive unit of the re-
garding transceiver. These receive signals contain information
regarding the distance between boundary layers of different
materials. After an algorithmic processing of the receive signals
of each sensor, the requested measuring values are ready for vi-
sualization within only a few milliseconds. The values can as
well be used for the control of the different dimensions of a
tube in the extrusion line.
Replacement of conventional technologies
For the development of the technology on the basis of a CW-
millimeter wave chip, the goal of creating a non-contact mea-
suring device at the extrusion of tubes that is maintenance-free
and durable, was decisive. By independently identifying the
characteristic values of the material, the CENTERWAVE 6000
generates the measuring values with highest precision, without
the need for specifications regarding the material parameters.
The CENTERWAVE 6000 is going to provide highly precise mea-
suring values at different positions of the production line (even
in the hot area) as there are no coupling mediums needed,
temperatures are not decisive and no calibrations are necessary
Product spectrum
Two stand-alone gauge heads for different tube diameters from
120 to 400 mm and 250 to 1.000 mm were created. The indus-
trial PC ECOCONTROL 6000 offers, besides a numeric presentati-
on of the measuring values, also a graphic visualization as well as
extensive trend and statistic data features. The calculation of virtu-
al measuring values at the position of the extruder allows the line
manager to react quickly to changes. Even with larger delay times
between the position of extrusion and the measurement an effec-
tive and fast control of the wall thickness and especially the elimi-
nation of excessive consumed material is guaranteed.
SIKORA AG
Bruchweide 2, 28307 Bremen, Germany