University College London | Slade Centre for Electronic Media in Fine Art

Big photos of little coins: National Physical Laboratory

National Physical Laboratory (NPL) wrote:

Martin John Callanan of the Slade School of Fine Art at University College London contacted the National Physical Laboratory (NPL) as he wanted to put together an exhibition featuring large images of the lowest denomination coins from around the world.

Petra Mildeova from NPL’s Advanced Engineered Materials Group demonstrated that full colour images could be taken using an infinite focus 3D optical microscope. Five coins were imaged (containing over 400 megapixels), allowing coins of less than 20 mm diameter to be printed as 1.2 m diameter images.

Martin John Callanan described the images as “really stunning” and is exhibiting them at the Galleria Horrach Moyà in Mallorca, Spain, in an exhibition entitled ‘The Fundamental Units‘ (referring to the smallest denomination of coins on display and not as a result of working with NPL, the home of fundamental constants in the UK). He now hopes to enhance his exhibition by imaging a further 161 coins, one from each of the other countries around the world that use them.

The images have attracted interest from the British Museum and were featured by New Scientist as their image of the day on 4 December 2012.

The mapping of large areas at very high resolution is becoming a more regular requirement. In fact, the capabilities of the microscope used to produce the images of the coins were barely stretched, as they were only in 2D. Using the Alicona Infinite Focus optical microscope NPL is able to acquire 3D datasets from large areas, which can be used to study worn surfaces on a gear, drill bit or metal punch and hence produce a detailed measurement of the volume of material lost by wear of the component. Such quantified volume measurements can then be used to determine the best material or operating practice for a given material grade.

Back-to-basics money shot shows a cent’s battle scars – New Scientist

The euro has taken a bit of a battering of late – and not just in the financial markets. As you can see for yourself above, the surface of a 1-cent coin, while smooth to the naked eye, is pitted and scarred when viewed through a powerful microscope.

To create this image, artist Martin John Callanan, a fellow at University College London based in the Slade Centre for Electronic Media in Fine Art, worked with Ken Mingard, Petra Mildeova and Eric Bennett at the UK’s National Physical Laboratory in London. The team used an optical microscope to create images of the lowest-denomination coins used in Australia, Burma, Swaziland and Chile, as well as the transnational euro. They took standard coins that had been in circulation and left the microscope to make 4000 tiny exposures overnight. It then took three days of processing to stitch these images together to create each final, 400-million-pixel version. The zoomable picture above is a low-resolution version.

The coin images are part of an ongoing series called The Fundamental Units in which Callanan explores “the atoms that shape the global economy”. Ultimately, the series will encompass all 166 of the world’s active currencies that use coins. The first five are on display as 1.2-by-1.2-metre prints, along with more of Callanan’s works, at the Galleria Horrach Moyà in Mallorca, Spain, until 17 January 2013.

Physics & Math, Picture of the Day, Science In Society

Sumit Paul-Choudhury, editor, 16:05 4 December 2012

Several Interruptions

To celebrate 15 years of ground breaking research in electronic media, the Slade Centre for Electronic Media in Fine Art (SCEMFA) will hold a 14 week exhibition, showing new works from eight internationally acclaimed artists: who use emerging practices to explore electronic and digital media, as both a source and material.

Martin John Callanan, 24 – 30 January
Thomson & Craighead, 2 – 13 February
Tim Head, 15 – 20 February
Simon Faithfull, 22 February – 6 March
Brighid Lowe, 8 – 13 March
Melanie Jackson, 15 – 20 March
Susan Collins, 23 March – 17 April

An exhibition that revolves every fortnight between each artist, acting as a showcase for the best of contemporary art in the UK, and highlighting the Slade’s pivotal role in the history, development and current research in the many varied forms of electronic media.

Tuesday – Friday: 10 am – 5pm, Saturday & Sunday: noon – 5pm
North Lodge, University College London, Gower Street, WC1E 6BT