FOCUS UK PHOTONICS


Nottingham Trent Uni paints picture of Chinese-European history


Technology developed by Nottingham Trent University is helping unravel the history behind paintings belonging to the Victoria and Albert Museum (V&A) and Royal Horticultural Society (RHS).


Dr Haida Liang, a reader in physics at the


university’s School of Science and Technology, is leading a team to use Optical Coherence Tomography (OCT), multispectral imaging and other non-invasive and non-contact scientific techniques to analyse watercolours exported by China during the 19th century. The OCT device scans the layers below the surface of an object with infrared light in order to reveal details not visible to the naked eye, such as the thickness of paper and preparatory drawings. Multispectral imaging enables scientists to scan paintings with different wavelengths of light to reveal the composition and make-up of the paints used. Dr Liang, head of Nottingham Trent


may otherwise only ever be discovered through the removal of tiny samples from a painting, something which is not allowed on historic paper- based works of art.


These technologies – developed by Nottingham


Trent University – were combined with the V&A’s expertise in Raman spectroscopy and X-ray fluorescence spectroscopy to examine the palette of the Chinese paintings. The findings – which were revealed during a


‘ The OCT device scans the layers below the surface of an object with infrared light’


University’s Imaging Science for Archaeology and Art Conservation research group, said: ‘By using a suite of complementary, non-invasive technologies we’re able to uncover just as much information from historic paintings than traditional destructive techniques. This helps to deepen our understanding of art history as it allows us to correlate the material actually found on the paintings with historical records.’ Such information


workshop at the V&A recently – are part of a larger study to develop a greater understanding of the historic trade and cultural exchanges between China and Europe, which will finish at the end of January. During the workshop it was revealed that a number of watercolour paintings of plants – that were commissioned by the RHS in the early 19th century for scientific purposes and overseen by an RHS representative in Macau and Canton – were painted on European


paper. Some of the paintings were also found to have included preparatory drawings with a graphite-like pencil, a technique which was not commonly used at the time by Chinese artists. It was also revealed at the workshop that paintings in the V&A collection – which were mainly exported by the Chinese as souvenirs for tourists – included the colorant Prussian blue and cochineal, colorants exported to China by an East Indian Company.


Beam measurement device based on mobile phone lens technology commercialised


Arden Photonics has commercialised a laser beam measurement device originally developed by the UK’s National Physical Laboratory (NPL). The BQM-50 beam propagation analyser is based on liquid lens technology used in mobile phone cameras, and offers customers a quicker and easier way of characterising laser beams to optimise their performance. It uses a low-profile, high pixel-density camera and is compact and light enough to be bolted onto equipment – removing the need to interrupt an operation to measure the beam. The NPL developed a small, accurate prototype camera for characterising laser beams using commercially available liquid lens technology for mobile phone cameras. The partnership between the NPL and Arden Photonics is part of the NPL Technology Applied, a co-branding scheme for instrumentation and software technology developed by the NPL and incorporated into commercial products. The BQM-50 is ideal for measuring lasers used in applications such as surveying, medical diagnosis, precision measurement, scanning and lidar. It is also an important tool for laser safety classification, allowing retinal hazard to be assessed.


Simon Hall from NPL, who developed the prototype, said: ‘Using commercially available technology allows us to dispense with the slow, bulky and expensive movement slides usually required to measure lasers.


‘The BQM-50 can measure laser beams quickly and effectively – just as you can zoom in and out in milliseconds on your phone camera.’


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