metrology Articles
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Revolutions in optical metrology in the era of Big Data and Industry 4.0
Abstract When looking at the role of metrology in the ‘Fourth Industrial Revolution,’ one wonders whether metrology developments are being driven by Industry 4.0, or the other way around. Closed-loop manufacturing quality control is, after all, the art of the possible. For optical dimensional metrology and surface topography, advances in the ‘Internet of Things’ on the ...
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China National Institute of Metrology (NIM) - Case Study
NIM is the nation’s highest research facility of measurement science, a national statutory authority in the field of metrology, and a non-profit R&D institution. Since establishment, NIM aims to be a pioneer of the metrology community. NIM is using Nutech Preconcentration system for VOCs standard gas ...
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Discussion on the Gaussian assumption in flow rate measurements using a primary weighing method
Flow rate measurement is a common task in many hydraulic infrastructures included in systems with a large impact on the economy. The quality requirements that such measurement must fulfil imply the best knowledge of the measurement results (estimates and measurement uncertainties). Methods such as those given by the Guide for the Expression of Uncertainty in Measurement (GUM) have been widely ...
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NanoVision Technology Enables Particle Monitoring of High Molecular Scatter Chemistries
Abstract Semiconductor manufacturing utilizes ultra-pure chemistries which frequently have significant molecular scatter. This high molecular scatter reduces the signal-to-noise efficiency of older particle metrology technology and in some cases prevents its application in more demanding chemistries. In production, an adaptable metrology solution is required to effectively characterize the broad ...
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How is Metrology Used in Aerospace?
Products and components made for the aerospace sector are often mission-critical, both precision and reliability are all vital to ensure success. This places an onus on metrology tools to work and work well, feeding back measurement results that are right first time, and right every time.One significant trend in the aerospace sector is towards the use of composite materials, typically materials ...
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A teaching factory for polymer microfabrication – μFac
As part of the Singapore MIT Alliance (SMA) we have established the Center for Polymer Microfabrication (CPM) with an initial focus on processes and systems related to volume production of microfluidic devices. This research has focused on topics as diverse as material processing property characterisation and simulation, tooling and equipment design and control, and process control and metrology. ...
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Why Computer-Generated Holograms Matter in Asphere Metrology
Aspheres and other complex optical surface shapes have become common to many optical systems as they offer wider design flexibility, lighter weight, smaller volume, and optimized optical performance. CGHs are a natural extension of Fizeau interferometry, the industry standard for optics metrology, and offer significant benefits for metrology of aspheres. But challenges remain for CGHs in ...
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Company Uses Zygo’s Metrology Systems to Support Virtual Reality Product Development - Case Study
A company with operations in the United States, Europe, China, and Japan develops innovative virtual reality (VR) solutions that enable users to experience the best in VR and immersive reality technologies. Because the company develops new products on its optics, metrology was extremely important to Captain Lin, a former director at the ...
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Additive Manufacturing — New Frontiers for Production and Validation
Today, additive manufacturing (AM) is dramatically changing the way that manufacturers produce end-use parts and components. Not surprisingly, analysis of the accuracy and repeatable tolerance range of AM has become a critical issue. If an AM part is integral to a safety–critical aerospace or medical application, it is essential to achieve dimensional and surface finish tolerance targets ...
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Characterizing Topographic Spatial Resolution With the Instrument Transfer Function
Abstract A metrological characteristic common to all methods for areal surface topography measurement is the topographic spatial resolution (TSR), defined as the ability to distinguish closely-spaced surface features. This ability is limited in mechanical stylus instruments by the stylus tip geometry, while for instruments that rely on optical imaging, influence quantities can be the Rayleigh ...
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A Robust Hydrophone for HIFU Metrology
Abstract. The high acoustic intensities generated by HIFU systems cause conventional hydrophones to fail before measurements can be reliably made. To address this challenge, we present a new piezoelectric needle hydrophone, which is resistant to cavitation while possessing a flat frequency response (+/- 3 dB from 1 to 10 MHz) and a small effective aperture (400 micron effective diameter). This ...
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An instrument transfer function approach to atomic force microscopy for surface metrology
In using the frequency domain as a unified platform for representing topology of the sample and capabilities of an instrument, it is shown that instrument transfer functions, when applied to scanned probe instruments such as the atomic force microscope, serve as a powerful design and analysis tool. An instrument transfer function approach is proposed to capture the characteristics of atomic force ...
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3D Optical Metrology – Versatile Tools for Advanced Manufacturing
When looking at metrology, general discussion often revolves around the relative merits of contact or non-contact measurement solutions. There is now a drive across nearly all industries for smaller and more complex components (which are often prone to contamination or damage by even the slightest contact with a probe). For these exacting applications, non-contact optical metrology solutions, or ...
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AMC Control in Advanced DUV and EUV Lithography, Optical Metrology, Precision Optics, and Laser Manufacturing
Introduction The fabrication of Photolithography masks, reticles, and other precision optical components which are both defect-free and surface-contaminant free is of critical importance within the Lithography (“Litho”) and metrology functional areas within microelectronics manufacturing. The need for real-time AMC monitoring is well established within these industries wherever ...
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Characterization of a HIFU Field at High Intensity
Accurate quantification of HIFU fields has been hampered by the inability of traditional hydrophones to survive the high pressures encountered. We present a set of data at high intensities taken with a hydrophone capable of surviving this environment, which included 5 MPa maximum rarefactional pressure, pulse-average-spatialpeak intensity of 3760 W/cm2 , and a total power of 101 Watts. ...
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What's The Fuss With Vertical Integration in Optics?
It's an idea we like — one stop shopping. Saves us time, money, energy, and gives us a chance to visualize an entire project as it is mapped out across multiple disciplines. Think of a typical home kitchen renovation — it affects tile, cabinetry, hardware, flooring, appliances, paint, windows, doors and more. Usually, all of these components can be selected, compared, ordered, and ...
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How Non-contact Measurement is Supporting Growth in Consumer Electronics
Current landscape and challenges around optical manufacturing qualityFor manufacturers of today’s ubiquitous consumer electronics devices, having the utmost confidence, precision, and speed of metrology is critical. With components such as lenses, optical sensors, and camera modules having a strong influence on the completed device, manufacturers place importance on ensuring productions are of ...
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TEGAM’s RF Power Sensor Calibration System Propels NIMT to the Top of Metrology
The National Institute of Metrology of Thailand (NIMT) has upgraded the capability of their RF power sensor calibration system to 50 GHz, thanks to TEGAM’s thermistor RF power standards. With this upgrade, NIMT has now become one of the leaders in the world of metrology - capable of providing RF power sensors calibration service - traceable to NIST - from 9 kHz to 50 GHz. Metrology is the ...
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Good practice guide for miniature ETMT tests.
Abstract: This Good Practice Guide discusses various aspects of testing miniaturised testpieces of representative engineering alloys in the NPL / Instron Electro-Thermal Mechanical Test system (ETMT). Different strain measurement techniques are reviewed including the use of electrical resistance, grip displacement and image correlation. Detailed comments are given in respective chapters ...
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HK Government Laboratory - Case Study
The main role of the Government Laboratory is to provide a wide range of analytical, investigatory and advisory services and support to enable departments and bureaux of the Government to meet their responsibilities for law and order, public health and safety, environmental protection, government revenue, consumers’ interests and implementation of government policies. It is also actively ...
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