Polytec Magazine
//Welcome to our web magazine. Read through user articles, research reports and technology trends – and experience measurement technology from all sides.
A modern approach to germ-free food packaging
Since the 1960s, sterile packaging has played an important role in food safety. However, there has been little innovation since then. Chemicals and heat remain the most common methods for sterilizing food …
A new driving mechanism for acoustofluidics*
Acoustofluidics is the active manipulation of fluids as well as of immersed particles or cells at the micro- and nanoscale and is a key technology for life sciences. Acoustic waves, more precisely, ultraso…
Analyzing operational deflection shapes on loudspeakers
Noise protection and control play a major role in both professional and private environments. Airborne sound measurements help identify acoustic paths as a means of noise reduction as standard testing meth…
Characterizing surface texture, roughness, imperfections and scratches
Optical polishing is a fabrication technique developed specifically to achieve minimal defects and smooth micro-roughness values. Polishing is a process that involves the use of free grains, usually suspen…
Complete thermographic solutions for safety and process control
Thermographic methods, whose typical false colour images visualise temperatures, are suitable for many areas. Their possible uses in industry are particularly varied during the monitoring of temperature-de…
Confirm flatness, roughness and step height – TopMap quality control on the factory floor
Consistently producing high-quality precision parts is better achieved when the supporting metrology is tightly integrated with the manufacturing process. By combining Polytec’s TopMap optical metrology wi…
Continuous fiber optic strain measurement
Some bridges in Germany are aging and not designed for today’s increasing traffic loads. Authorities must now find cost-effective solutions to manage these existing structures.
Controlling the length cutting of the trapezoidal sheet metal profiles
Significantly higher demands are being placed on quality and dimensional stability in the production of premium trapezoidal sheet metal profiles. A wide variety of different profiles and surface properties…
Distributed Fiber-Optic Sensing for Geotechnical Monitoring
Stones, blocks, steel, cement, concrete, and mortar—combined with large, heavy, clumsy, and noisy construction machinery—hardly make an ideal environment for a fragile glass fiber.
Distributed fiber-optic temperature and strain measurement with extremely high spatial resolution
Sampling of the Rayleigh scattering along a length of optical fiber allows the realization of a distributed sensor system where every point along the fiber acts as a sensor. This novel method allows ...
Efficient process control using ProSpeed® laser speed and length sensors
Climate change is one of the dominating challenges of modern society and industry. Even though steel is one of the worlds most recycled materials, the steel industry remains the largest industrial emitter …
Expanded options for deformation tests in materials analysis
In materials research, digital image correlation (DIC) is an established method for accurately and non-contactly detecting deformations. This applies to tensile, compressive, and bending tests as well as i…
Fiber Bragg Grating Sensors in Practice
Fiber-optic sensors are used in wind turbines not only for monitoring but also for control, for example, to adjust the rotor blades based on load measurements of the blades.
Fiber-Optic Temperature Measurement in Chemical Process Engineering
Conventional measurement methods quickly reach their limits when electromagnetic immunity, high measurement density, or chemically aggressive environments are required
Fiber-optic sensing in basic research
Friction clutches are used in millions of automobiles to transfer the engine’s torque to the drivetrain. However, the physical processes involved in frictional power transmission are still not completely u…
For permanently high screw pre-tensioning force and optimum corrosion protection
The surface properties of coatings and paintwork play an important role in many products, as they have a significant impact on visual appearance, corrosion protection and resistance to physical damage. Inf…
Gravity in the Lab
Anyone wanting to measure G needs an experimental setup capable of the seemingly impossible—detecting movements smaller than the diameter of an atom, triggered by pure “action at a distance.” The team arou…
How fiber-optic temperature measurement helps develop Power-to-X technologies for the energy transition
Fiber-optic systems measure temperatures across fields, excelling where many sensors, compact size, and low thermal mass are needed—one 150 µm fiber can replace hundreds of sensors.
How surface metrology reveals the finest forensic details
Forensic science plays a vital role in the criminal justice system by providing scientifically based information through the analysis of physical evidence. During an investigation, evidence is collected at…
Inline measurement system for powder coatings
Powder coating quality depends on thickness and uniformity, especially at critical points. Photothermal measurement systems offer practical solutions for quality control.
Interview with Prof. Dr. Albert Weckenmann about optical and tactile surface measurement technology
We talked with Prof. Dr. Albert Weckenmann of the University of Erlangen-Nuremberg, Germany, about the limitations of tactile surface measurement technology and the opportunities of non-contact methods.
Laser vibrometry is the key
叶缘焦枯病菌(xylella fastidiosa)会在农作物中会引起多种严重病害，这种植物病原体是加州和南美的葡萄树产生致命疾病的罪魁祸首，仅加州每年需为此耗资1.04亿美元。在一个专门的研究项目中，不同于现有的使用农药来消灭害虫的方法，科学家们找到了一种对生态系统无不良影响的方法-利用激光振动测量技术来分析昆虫们求偶时的通讯方式，从而采取手段来控制害虫繁衍。这为自2013年以来惨遭叶缘焦枯病菌肆虐的欧洲…
Laser vibrometry visualizing haptic feedback
The smartphone has shown that buttons can be replaced without sacrificing comfort. The freely configurable display with gesture control has made it even easier to switch between applications. Hap2U drives …
Laser-Doppler-Vibrometer set standards in the development of electric drives
Electric machines are increasingly being used as the primary drive technology in vehicles. The acoustic behavior of the drive is a key factor in the perceived quality of electric vehicles. Numerical method…
Manipulation of complex fluids with SAW-based acoustofluidics
Surface acoustic wave (SAW)-based acoustofluidics combines microfluidics with active microacoustic fields. This allows to realize numerous Lab-on-a-Chip operations, reaching from fluid manipulation includi…
Non-contact alternative to dynamic and viscoelastic mechanical testing in cartilage
Osteoarthritis, a degenerative disease in the joint, is a condition that is afflicting approximately 14% of adults. Understanding the dynamics of the joint cartilage is crucial for research and for finding…
Optical encoders as the reliable measurement system for pipe and tube production
The Polytec LSV laser velocimeter offers process control with utmost precision for the production of flat, round and long products based on laser-precise and repeatable measurement of e.g. tube speed durin…
Overview of optical methods for surface metrology
For applications where tactile surface measurement techniques have shortcomings, non-contact optical instruments have been developed to overcome these shortcomings. Especially with the development of compu…
Photonic sintering enables high-volume production of printed electronics.
The printed electronics technology has moved beyond its pioneering stage, with initial industrial applications already running. While potential uses are diverse, turnkey system solutions that simplify adop…
Photothermal measurement method for opaque coatings and all common substrates
For many industrial products, the quality of coatings plays an important role. For example, the material thickness, color, gloss, or adhesion of one or more layers on a substrate
Precise layer thickness measurement without referencing
For many products, coating quality is crucial—such as material thickness, color, gloss, or adhesion of one or more layers to a substrate. Regardless of their purpose, measuring the thickness or uniformity …
Pulsed UV light against germs
Hygiene is essential in all areas of the food industry. This is especially true for dairy products like yogurt, which are highly susceptible to contamination by microorganisms and mold spores. These can or…
Sterilization by Light Flash
The success of sterile environments in the pharmaceutical, medical, and food industries depends on transferring materials in and out without causing microbial contamination
UV Technology for a Wide Range of Applications
Bei Portfolioerweiterungen setzt Polytec auf ausgereifte, qualitativ hochwertige und technologisch zukunftssichere Produktlinien.
Vibration analysis helps to protect art
像美国圣达菲的乔治娅·奥·吉弗（Georgia O’Keeffe）这样的博物馆，为了组织巡回展览，除了自有展品外也需要从其它博物馆和私人收藏家那里临时借出藏品，丰富的展品以吸引更多的观众。仅2017年，乔治娅·奥·吉弗博物馆的绘画展览在布鲁克林、伦敦、巴黎、维也纳、多伦多、悉尼、墨尔本和布里斯班等多个城市的累计参观量超过130万人次。
Xenon Double-Pulse Achieves Breakthrough in Photonic Sintering
Printed electronics are making inroads into the industrial application market. The technology used is well established, but not all applications can be realized with these conventional methods. The key rol…
三维扫描式激光测振仪测量节能涡轮
飞机油耗是当前关于全球气候变化讨论的热点话题之一，这其中一个重要的影响因素是飞机发动机本身的设计。与传统发动机叶片不同，整体叶盘由一块材料加工而成。
专注于微陨石的撞击检测
太空探索商业化进程的推进，大幅提升了对应用于太空及行星探测、卫星任务的创新技术的需求。确保太空结构的安全性与可靠性，关键在于对其结构完整性进行精准评估。太空环境极为严苛，存在辐射以及剧烈的温度波动等状况，这些因素会加速材料的劣化与损耗 。
人耳听小骨的振动研究
人类的中耳将由声波所引起的鼓膜振动通过听小骨传输至内耳。在接近听觉阈值时，鼓膜所产生的三维振动位移仅有几个纳米，因此，研究人员需要使用非常精准的非接触检测设备来测试这类振动。
优化光学自由曲面的制造工艺
使用光学自由曲面可以简化复杂的透镜系统，从而使其结构更加紧凑和重量优化。此外，光学自由曲面的使用还可以实现全新的功能。与此同时，它们的制造工艺更为复杂，耗时更久且成本昂贵。使用数控机床可以小批量地高效生产单个自由曲面。
何时选择激光多普勒测振仪进行振动测量
在振动测试领域，附加质量是一个不容忽视的重大难题。动态振动样本或被测器件（DUT）的性能，极易受到额外附加质量的干扰。这种现象在振动的悬臂梁结构中表现得尤为突出，而在处理涡轮叶片这类特殊的弯曲悬臂梁时，情况更是复杂棘手。利用加速度计精准测量涡轮叶片的共振频率，向来是一项颇具挑战性的任务，其中附加质量的影响是主要阻碍因素。即便极为小巧的加速度计，其增加的质量也会改变涡轮叶片的固有频率，使得精准测量困难重重。
使用PSV-500-3D Xtra系统测试滚动轮胎
使用3D Xtra系统获取滚动轮胎的3D工作变形，揭示噪音来源 在不同的驾驶条件下，滚动轮胎会在车厢内外产生大量的噪音(NVH)，这种噪音必须解决掉的三大理由： ` 滚动轮胎产生的路面噪音会降低车乘体验，并会干扰道路沿线的居民。 ` 许多关注市区噪声的国家预计会出台有关限制轮胎噪音的新规定。 ` 电动汽车因没有内燃机噪音的优势，有可能因为轮胎噪音而大打折扣。
使用QTec®多通道干涉技术测量频响函数
频响函数（FRF）的测量对于获取结构的动力学特性具有重要意义。在大多数情况下，我们的测试目的是对系统进行测量分析，或者确定动态特性用于验证仿真模型。 在结构动力学中广泛使用的获取频响的方法是用脉冲锤进行系统激励，用加速度计测量响应。这种方法的缺点是，粘贴式传感器存在附加质量和和刚度（电缆）影响，尤其是在测量轻质结构时，会造成被测结构的动力学特性的显著变化。
使用激光测振仪评估触摸屏在-40° ~ 85°C温度范围内的声学性能
汽车中控面板触摸屏界面的增加会导致视觉信息过载，从而带来严重的安全隐患。触觉反馈技术可改善用户体验，并减少与触摸屏交互的认知负荷。最近由Vibra Nova收购的hap2U的触觉技术是基于压电致动器产生的超声波传播。致动器产生的振动减小了用户手指与触摸屏玻璃表面之间的摩擦系数，这种现象被称为主动润滑。
使用采用 EMS 压电无痛技术的超声波洁牙器，呵护健康牙齿
瑞士E.M.S.公司生产的超声波洁牙器，采用Piezon无痛技术，可有效帮助客户保持牙齿健康。为了尽可能地维持牙齿的健康，防止龋齿和牙周感染，家庭护理方法如刷牙和使用牙线是非常重要的。不过仅靠这些是不够的，因为即使这些家庭护理操作得当，口腔内仍会产生菌斑，它是龋齿、牙周病和种植体周围疾病的主要致病因素。
全场激光测振扫描中振动热点的直观可视化
Everybody enjoys good sound quality on a mobile device when watching a show or when communicating with friends and family or in a business environment. On the other hand, we cringe when something is off wi…
关于昆虫听觉与激光测振技术的温德米尔博士访谈
来自格拉斯哥斯特拉斯克莱德大学的温德米尔博士致力于研究昆虫的听觉。我们就其研究内容及Polytec激光测振仪在其中所扮演的角色，与他展开了交流。
制动盘的试验模态分析
仿真模型的验证是激光测振仪的重要应用领域之一。为此，先将有限元模型的几何数据导入至测量系统的软件中，由系统内置的校准系统完成模型与实物之间的校准，导入的样品几何数据与其实际的几何数据之间的偏差，都将由软件内置的形貌测试程序来进行修正并更新至模型中，这种方法精确度高，还能节省大量时间。
剪切激波如何影响感知
触觉全息术或空中触觉技术有望让虚拟现实成为现实，但一项新研究揭示了一个令人意外的物理障碍，有待克服。加州大学圣巴巴拉分校的一个研究团队发现了一种新现象，它是新兴全息触觉显示器的基础，这一发现可能会带来更引人入胜的虚拟现实体验。
压电片谐振器轮廓模态的单电极传导
压电片谐振器用于传递特定的轮廓模态体声波(BAW)谐振振型。基于铌镁酸铅-钛酸铅 （PMN-PT）薄膜的独特性，必须使用激光多普勒测振仪来测量微型盘式谐振器。PMN-PT是一种铁电材料，以其良好的压电和电致伸缩性能而闻名。面内位移曲线，可显示出轮廓模态、共振模态、切向模态和酒杯模态族。这些轮廓模态对生物传感、射频和旋转传感应用具有重要意义。
基于 3D 激光多普勒测振仪的机械物理特性解密
送料技术作为自动化生产的核心工艺，其系统仿真开发依赖于对机械物理特性的深度认知。RNA 集团作为送料技术领域的专业机构，借助 Polytec 测试技术体系，完成对全维度物理现象的解析，并通过分析模型实现物理特性的数字化映射。
基于宽带压电激励的测量
本文以齿轮为例，对多种形式的力激励进行比较，旨在确定机械系统的传递导纳。其目标是分析和评估技术结构（如电动汽车传动系统）在高频范围内的声学特性。实验表明，采用宽带压电激励时，收集到的测量结果一致性更高，尤其是在高频段。
基于模态测试的监测系统
随着人们对基础设施的安全性关注度越来越高，对现有结构的安全评估和剩余使用寿命预测提出了挑战。可靠的、技术上可行的和经济的健康监测解决方案是保证结构安全和满足用途的必要条件，是获得有关结构损伤过程和当前结构特性的有用信息的关键前提。
基于激光多普勒测振技术，实现精确且可重复的原子力显微镜测量，助力更定量的检测
原子力显微镜（AFM）作为一种强大且应用广泛的纳米级成像技术，极大地革新了我们在原子和分子尺度层面对表面及材料的认知。凭借其在纳米尺度下实现高分辨率成像、力测量以及材料操控的卓越能力，AFM 已然成为材料科学、生物学和纳米技术等诸多领域中不可或缺的关键工具。
如何测量非洲象群间的低频通讯。
最近发表在《欧洲物理杂志专题》（European Physical Journal Special Topics）上的一项研究介绍了激光多普勒测振仪（LDV）的一项开创性应用，以更好地理解非洲象的发声及其行为含义。这项研究的主要目的是确定大象群体中声音交流的动态，特别关注一种被称为“我们出发吧”的的特定隆隆声。这些隆隆声序列在协调大象群体的运动、空间关系和加强社会联系方面起着至关重要的作用。
实现静音与可靠运行的噪声和模态分析
无人机市场正经历多维度的蓬勃发展
庆祝干荣珠教授出色的职业生涯
我们有幸于2022年7月26日远程采访了干荣珠教授。在她所在的科研领域里，她的声名如雷贯耳。她是俄克拉何马大学机械工程系的首席教授，已在该大学工作了25年，更重要的是，她是人耳力学领域的先驱之一。她做过中耳，内耳的有限元建模、植入式装置、组织生物力学等等。
快速测量超声换能器的性能
Next generation ultrasound imaging research is focused on a new sensor technology which utilizes large arrays of small membrane sensors. Accurate performance from these sensors can enable a new suite of me…
惯性激振器用于模态测试
当被测物体无法自振时需外部激励。模态试验常用电磁激振器和力锤。Polytec扫描测振仪配SAM自动力锤提升效率。
探究准周期超材料的复杂物理特性
超材料是由已知材料按特定排列方式组成的人造材料组合，能展现出天然材料所不具备的新奇特性。在众多应用领域中，超材料在隔振、噪声控制、波导以及能量收集技术等方面前景广阔。
更高效质量控制
生产控制及其相关测量过程与评估的自动化，能大幅减轻常规工作负担，并有效提高生产控制效率，是现代制造技术的核心议题
激励力
人工激振是各種噪音與振動技術的基礎，涵蓋實驗模態分析、傳遞路徑分析、載荷識別、模擬模型相關性分析、混合建模等領域。結構激振可透過多種方式實現，從手動衝擊錘、自動化錘具，到外部支撐式振動台乃至自支撐式振動台皆可達成。
电动机振动表面的声辐射特性测量
随着电动汽车和混合动力汽车市场需求的不断增长，人们对车内噪声水平提出了新的要求。电动汽车传动系统与传统的内燃机传动系统的声辐射特性明显不同。德国卡尔斯鲁厄理工大学（KIT）的产品工程学院（IPEK）对此做了深入研究。
相干扫描干涉测量技术（CSI）
了解相干掃描干涉儀（CSI）的光學技術如何分析地形、形狀與粗糙度，並與相關光學表面檢測方法相比，其優勢所在、最佳應用點及實際應用範疇。
确定大型、自适应柔性机翼的动力学特性
第七届欧洲框架计划的SADE项目（新一代机翼的增升装置），旨在提升飞机在飞行过程中尤其是着陆时的空气动力性能、燃油经济性及降低噪音和排放。
精密测量自激励多悬臂梁MEMS微器件的振动
使用超高分辨率显微式激光测振仪MSA-600获取受分子布朗运动激励的多悬臂梁MEMS微器件的振动特性。这种新颖的测试方法还可用于如原子力显微镜（AFM）的微小针尖的振动测量。
蛛网的实地阻尼测试
蛛网的编织形式巧夺天工，具有非常独特的建筑学、力学和动力学性能，真可谓是自然界的奇迹！蛛网常见的结构，即由一个中心伸出的若干呈放射状的骨架丝线-纵丝和围绕这个中心的螺旋丝线-横丝构成的网状结构。蛛网需要抵抗风致振动及飞行猎物的高能冲击。为预测一个完整蛛网结构的振动阻尼响应，我们在蛛网形成地点-丛林实地，测试其组成丝线的阻尼特性。
论振动在蜜蜂觅偶过程中的作用
在动物界，由雌性来决定交配权的现象很普遍。本文旨在研究雄蜂的振动是否是雌蜂选择交配对象的影响因素之一，我们使用德国Polytec公司的激光测振仪研究雄蜂在交配期间的振动，期待揭示更多蜂群使用胸腔振动来进行内部交流的秘密。
超声换能器的有限元验证
超声成像是医学影像技术的主要工具之一，通常被称为医学超声波诊断法。产生超声波的超声换能器技术的发展是医学超声研究的热门课题。
边界条件，测试误差，可重复度
在MAN ENERGY SOLUTIONS，我们为海事部门提供系列综合发动机、螺旋桨、艉部设备和涡轮增压器。可靠性是我们行业（尤其是船舶业）关注的第一要务。在产品的研发阶段，我们使用德国Polytec公司的扫描式激光测振仪来获取测试数据，不断地对样件进行模态验证及模型优化，测试，直到部件可以进行量产。
非接触式观察心脏颤动，相当于用八倍镜观察，虽远，但纤毫毕现
心脏和循环系统疾病是人类最常见的致死病因——甚至比癌症还要严重！因此，我们要非常重视心脏的健康。那么该如何重视呢？我们知道，当医生使用心电图(ECG)测试心脏功能时，会观察脉搏上升曲线图。