NPL using Olympus LEXT OLS4000 to develop areal surface texture measuring standards
Hamburg, 1.07.2010 – Olympus has today announced that the National Physical Laboratory (NPL) is using its LEXT OLS4000 in a project to establish good practice guidelines for the calibration of 3D/areal surface texture measuring instruments. The NPL project will establish robust and easy to use calibration steps and reference standards for all the major areal surface measurement instrumentation technologies, with the LEXT chosen as the reference imaging confocal microscope. The good practice guide on calibration of confocal microscopes will also provide input to the upcoming ISO 25187-707 standard.
Instruments capable of providing areal surface texture information, such as the Olympus LEXT OLS4000 confocal microscope, are becoming increasingly popular, but currently lack any traceability routes. As a result, ISO standards are being prepared by a team led by Prof Richard Leach, Principal Research Scientist at the NPL. As an important component of these standards, Prof Leach’s team is defining good practice guidelines using archetypal examples of: stylus instruments; white light interferometers; focus variation instruments; and confocal microscopes. The project will use a range of artefacts to characterise the scaling, linearity, orthogonality, angular response, repeatability and resolution of the X, Y and Z axes. The LEXT OLS4000 is being used by Prof Leach’s team as the archetypical confocal instrument, although the guide will not be specific to the Olympus instrument. Prof Leach commented, “All measurement techniques require comprehensive reference standards to ensure consistency across the various instruments and technologies. These standards must also include robust, yet easy-to-use, calibration steps for each technology and, therefore, it is essential to have access to typical examples of each technology.” As well as enabling the generation of good practice guides, the project will also define the reference areal artefacts to be used during calibration. Once the project is complete, users of areal surface measurement instruments will be able to obtain a calibration ‘bento’ box with the guidelines and artefacts to ensure better accuracy both within and between instruments and projects.
Olympus LEXT OLS4000
The Olympus LEXT OLS4000 has a large and very fast MEMS scanning mirror along with dual pinholes, which provides one of the most advanced measuring confocal laser scanning microscopy in the market. The larger mirror enables the system to provide superior optical quality, and the increased scan speed reduces the time it takes to create a 3D image of a sample. The 405 nm laser and dual pinholes operate simultaneously to ensure that the system provides the highest possible resolution and contrast as well as enabling steep slope detection up to 85o, ensuring that even the most complex of surface topographies can be imaged and analysed. These features, along with its accurate Z-drive and stage combine seamlessly with the advanced, yet intuitive, software interface to provide the measurement capabilities and flexibility required for even the busiest of laboratories.
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