Report on the reflectance of anti-glare sprays
Conducted for: Glare Buster Australia

3 Fortril Drive Springwood Qld Australia 4127
By: Dr. Ian Cowling Lecturer, Physics Department, Queensland University of Technology

Date: 1 August 1990

Test Procedure: The tests were carried out in the Photometric Laboratory in the Physics Department of the Queensland University of Technology.

Measurements were made by shining a standard incandescent light source onto glass coated with the anti-glare spray at different angles of incidence. The amount of reflected light was measured with a calibrated light meter as shown in the diagram. The coated glass sample was then replaced with and uncoated sample and the measurement repeated. The ratio of the reflected light from the coated glass slide to that from the plane glass slide gives the relative reflectance of the anti-glare coating.



Experimental setup for measurements. The ratio of reflected light from the glass coated with anti-glare to that from the uncoated glass is the percentage reflectance.

Measurements of relative reflectance were made at three angles of incidence 10 degrees, 20 degrees and 45 degrees. Coated samples tested were labeled TV(N). Two samples of each were supplied, identified as TV(N)-1 and TV(N)-2, as well as identical uncoated plane glass slide as the reference.

Apparatus:

Light source - calibrated incandescent lamp operating at 2850+/-50 K (source A). Irises were used to cone the light to a diameter of about of about 25mm on the glass slides and screens were used to minimize all stray light.

Light meter - Spotmeter using photopic response range and with cosine adaptor attached.

Errors in the relative reflectance are estimated as 5% of the calculated value.

The Results :