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Distributed fibre-optic temperature and strain measurement with extremely high spatial resolution

13.11.2012 - Photonik international /2012

"Scanning the Rayleigh scattering along a length of optical fibre enables a distributed sensor system where every point along the fibre acts as a sensor. This novel metho...
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This technical articel is also under the category: Fibre optics and Optical Communication

Microlens based 4D-lightfield cameras for 3D image recording through a single lens in a single shot

17.11.2011 - Photonik international /2011

The increasing power of digital image processing makes more and more application areas accessible. Industry, in particular, demands ever increasing camera resolutions and...
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This technical articel is also under the category: Image Capturing and Processing

Photoluminescence imaging applications in silicon photovoltaics

17.11.2011 - Photonik international /2011

Photoluminescence imaging of large-area silicon wafers was demonstrated at the University of New South Wales, Sydney, in 2005, and since then, the technique has proven to...
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This technical articel is also under the category: Laser Technology

Thermal hyperspectral imaging in the LWIR

17.11.2011 - Photonik international /2011

Hyperspectral imaging has gained importance in biomedical, chemical, industrial, aerospace and defense applications. In this article we see how ultimate performance, LWIR...
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This technical articel is also under the category: Image Capturing and Processing

Ion-beam based polishing error correction in mass production of precision optics

23.11.2010 - Photonik international /2010

CNC grinding and polishing are well established procedures in manufacturing optics. Lately, plasma- and ion-beam based techniques are more frequently used as alternatives...
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This technical articel is also under the category: Manufacturing of Optics

Extremely simple techniques for the complete spatio-temporal characterization of extremely complex ultrashort light pulses

23.11.2010 - Photonik international /2010

We describe four experimentally simple, accurate, and reliable methods for measuring both simple and very complex ultrashort light pulses. Although each method comprises ...
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This technical articel is also under the category: Laser Technology

In-line colour measurement in production environments

23.11.2010 - Photonik international /2010

Both the equipment and the measurement parameters play important roles in achieving reliable in-line colour measurement results. This article highlights several issues to...
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Non-destructive characterisation of AR coatings on curved surfaces

23.11.2010 - Photonik international 1/2010

Highly efficient anti-reflective coatings minimize disruptive reflection losses for optical components, such as precision optical lenses or ophthalmic lenses. Surface mea...
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Automated visual surface inspection in 3-D parts production

23.11.2010 - Photonik international /2010

Whenever the assured properties of technical and decorative surfaces cannot be ensured by the manufacturing process alone, determining surface quality through visual insp...
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This technical articel is also under the category: Image Capturing and Processing

A compact broadband EUV laser-plasma source for metrological applications

12.11.2009 - Photonik international 2/2009

Metrology applications require compact laser-plasma sources that generate broad extreme ultra-violet (EUV) radiation cost effectively. A combination of a small diode-pump...
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Diagnostics of high repetition rate pulsed lasers

12.11.2009 - Photonik international 2/2009

Developers and user of high repetition rate lasers are facing a number of challenging issues: Not only characterize pico- and nanosecond laser pulses in “no time”, but al...
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Laser Doppler distance sensor and its applications

12.11.2009 - Photonik international 2/2009

The measurement of distance with high resolution is of great importance in many technical processes. Due to their non-contact and precise measurement principle optical se...
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This technical articel is also under the category: Laser Technology

Automatic detection of surface and structural defects on reflecting workpieces

12.11.2009 - Photonik international 2/2009

In automatic real-time inspection of reflecting surfaces, the high-precision positioning required for the workpiece is particularly challenging. A new inspection algorith...
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This technical articel is also under the category: Image Capturing and Processing

Glass ceramic – foundation for highest precision

12.03.2009 - Photonik international 1/2009

Glass ceramics with zero thermal expansion have firmly established themselves as the material of choice for mirror substrates in large telescopes. At the same time, they ...
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This technical articel is also under the category: Optical Components

White-light interferometry for quality assurance

12.03.2009 - Photonik international 1/2009

Quality assurance requirements in the production process are becoming more and more stringent. Optical metrology – including white-light interferometry – is especially we...
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Imaging measurement of stress birefringence in optical materials and components

12.03.2009 - Photonik international 1/2009

Inherent stresses in optical components influence the polarisation of light by stress birefringence, an effect that is undesirable in demanding applications such as micro...
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OPSL technology provides new wavelengths that benefit forensics

12.03.2009 - Photonik international 1/2009

Tests at a leading UK crime research lab have shown that newly available yellow (577 nm) and blue (460 nm) multi-watt lasers can find otherwise hidden fingerprints and tr...
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This technical articel is also under the category: Laser Technology

All-digital and hybrid analog-digital beam profiling technology

12.03.2009 - Photonik international 1/2009

For the design and implementation of next generation super precision optical systems, the first commercially available hybrid analog-digital laser beam profiler is based ...
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Night-vision camera combines thermal and low-light-level images

14.11.2008 - Photonik international 2/2008

Even on moonless but starlit nights, highly sensitive InGaAs cameras still produce good images for short-wavelength infrared. By thinning the image sensor chip and with i...
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This technical articel is also under the category: Image Capturing and Processing

Quantum yield measurement of organic LED materials

14.11.2008 - Photonik international 2/2008

The suitability of new materials for OLEDs can be characterised by their emission properties. Their fluorescence and photoluminescence quantum yield is determined either ...
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This technical articel is also under the category: Incoherent Light Sources

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