Fenestration obscuration techniques

Michael Smalley

doi:10.1117/12.731239

8 October 2007 Fenestration obscuration techniques

Michael Smalley

Proceedings Volume 6741, Optics and Photonics for Counterterrorism and Crime Fighting III; 67410S (2007) https://doi.org/10.1117/12.731239
Event: Optics/Photonics in Security and Defence, 2007, Florence, Italy

Abstract

There are situations where it is advantageous to visually obscure through glass, to an external observer, the movement of people within a well lit room. It may be that the building use has changed or existing measures which had provided obscuration such as 'Bomb-blast' curtains have been discontinued. Recognising that implemented solutions must create the minimum disruption to outward visibility and involve the least procedural effort (be simple to use), the Centre for Protection of National Infrastructure, CPNI, commissioned this study, defining key requirements including: (a) Automatic or simple manual operation (b) Obscuration of movement within the building from outside (c) Varying levels of obscuration depending on the difference in internal and external light levels. (d) Minimum disruption to outward visibility (e) Acceptable for use on heritage and iconic sites (f) Easy to retrofit (g) Low cost This report reviews earlier work carried out into the protection of Guardrooms by the use of lighting techniques coupled with the use of reflective and screen printed films. Other innovative solutions including Electrochromatic controllable glazing which may prove more appropriate to office and commercial buildings are also considered. It is seen that some measures, (window films or blinds), are cost effective and unsophisticated while more complex automatic systems using reactive glazing can offer critical design advantages. It must be noted however that some of the key requirements are mutually exclusive and any solution chosen will always be a compromise based on client needs and circumstances.

Citation Download Citation

Michael Smalley "Fenestration obscuration techniques", Proc. SPIE 6741, Optics and Photonics for Counterterrorism and Crime Fighting III, 67410S (8 October 2007); https://doi.org/10.1117/12.731239

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KEYWORDS

Light sources and illumination

Glasses

Reflectivity

Solar energy

Liquid crystals

Visibility

Curtains

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