October 31, 2011

Artificial Sky Visit – UCL

Writing about web page http://www.slideshare.net/C_White/artificial-sky-visit-ucl

On Thursday 27th October I visited The Bartlett at University College London to see their Artificial Sky. The purpose of the visit was to see the types of facility available and see how it relates to my own project which looks at recreating illumination scenarios to assess the readability of in vehicle displays.

The Bartlett simulates daylight for scale models of buildings to assess the impact of ambient and directional light on lighting design. This is to complement or replace the need for artificial lighting for energy efficiency or to design the lighting within a room for human comfort.

The Bartlett Artificial Sky is very impressive - a 5m diameter geodesic dome comprising 270 diffused luminaires. It take approx. 3hrs to calibrate each luminaire and in each case the solid angle needs to be calculated to work out the area of the sky each is responsible for.

Each luminaire is individually addressable by the control system and each setting is calculated based on the luminance distribution required, the solid angle and the performance of the lamp/luminaire.

Any sky condition can be generated but they generally used predefined CIE standard skies with the addition of a sun simulator.

The sun is simulated by a 50W halogen lamp reflected by a parabolic mirror which collimates the light into parallel beams. The 'sun' is on a rotatable track which can be programmed to create almost any solar position for time of day/year in the northern or southern hemisphere.

The visit has given me an appreciation for the complexity of such systems and the size that would be required to do assessments on full sized vehicles. It has also given me the opportunity to try to embed a document from SlideShare into this blog!


- 3 comments by 2 or more people Not publicly viewable

  1. Claire White

    I’ve managed to add a link to the page but I think that I have failed in my first use of SlideShare :(

    31 Oct 2011, 10:18

  2. Jenny Delasalle

    Hi Claire,

    Generally, if you want to embed media into a Warwick blog, you need to look out for the little icon with an arrow inside a circle, which if you hover over it says “insert embedded media”. It’s towards the right of the toolbar that appears when you’re writing a new blog entry. Near the icon for inserting an image that looks like a tree!

    However, I just did this on my own blog for a Slideshare item: http://blogs.warwick.ac.uk/libresearch/ and it didn’t work when I gave it the URL. So, the best way to do it is:

    Write your blog entry text with a gap where you want the embedded item (maybe just at the end!) and click “Save for later”. Go to Slideshare and look at the item you wish to embed, and see the four links just above where the slides appear which say ” Email, Favourite, Download, Embed”. Click on “Embed”. Copy the code it gives you.

    Go back to edit your blog item: On your blog click on Admin: Manage your blog entries/drafts: and the title of the entry you just saved as a draft. Now look for the icon on the far right which says “HTML”. Click on this and you will see the code for your blog entry: paste the embed code you have copied into the place where you want the item to appear. You can then click on “Preview” to be sure that it has worked. And then click on “Publish” and you’re done!

    Best of luck!

    01 Nov 2011, 10:30

  3. Claire White

    Thanks Jenny,

    I took the HTML route and it looks like it worked!

    My supervisor has suggested that I use this blog as a forum for my sponsor company to follow the progress of my project between reviews, so being able to embed documents and links will be really useful.

    See you at the RSSP workshop x

    01 Nov 2011, 14:30


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