Skip to main content

Measurements of spectral transmittance and reflectance at variable angles of incidence

Objective



Available spectrophotometers allow the measurement of the spectral transmittance (T) and reflectance (R) of optical components only at normal incidence. From these data it is possible to obtain a rough estimate of the daylight and solar parameters of the glazing materials used for building and car windscreens. However the realistic computation of natural lighting inside structures requires the measurements of T and R at different angles of incidence, to account for the fact that the angle of the sun is a function of hour, data and latitude.
As a prerequisite to the development of an improved method for determining the angular dependence of T and R, this project will be carried out along two parallel activities:

a) an intercomparison of the features of the existing instruments modified to perform such measurements on a limited scale,

b) a preliminary feasibility study to demonstrate that a new proposed technique is capable of meeting the prescribed requirements.

Status:
The work is in progress.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Oxford Brookes University
Address
Gipsy Lane
OX3 0BP Oxford
United Kingdom

Participants (12)

Centre Scientifique et Technique du Bâtiment (CSTB)
France
Consorzio Ceo Centro di Eccellenza Optronica
Italy
Address
Largo Enrico Fermi 6
50125 Firenze
Flachglas AG
Germany
Address
Wilhelm-düll-straße 20
80638 München
Glaverbel
Belgium
Institut National du Verre
Belgium
Pilkington plc
United Kingdom
SAINT-GOBAIN-RECHERCHE
France
Address
39, Quai Lucien Lefranc
93303 Aubervilliers
STAZIONE SPERIMENTALE DEL VETRO
Italy
Address
Via Briati 10
30141 Murano
Società Italiana Vetro SpA
Italy
TNO
Netherlands
Technical Research Centre
Finland
UPPSALA UNIVERSITY
Sweden
Address
Sankt Olofsgatan 10B