BRDF Measurements - Light Tec
BRDF Measurements - Light Tec
BRDF Measurements - Light Tec
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
REFLET : Scattering <strong>Measurements</strong><br />
Application Note:<br />
From Measurement to<br />
<strong>BRDF</strong><br />
Lambertian Standard (spectralon) from<br />
Labsphere<br />
The REFLET measurement bench is measuring the scattered light for a fixed incident angle.<br />
This measurement is done scanning the scattered light either in one plane (2D scan) or in several<br />
plane (3D Scan). We can scan the whole hemisphere.<br />
After a measurement, the measured data has to be:<br />
1. re-calculate knowing the calibration of the bench<br />
2. transform in <strong>BRDF</strong> values.<br />
REFLET response: the measurement of the lambertian standard shows small deviation.<br />
We are going to check the repeatability and the accuracy of the REFLET bench.<br />
Measurement of the spectralon:<br />
Espace Alexandra - 359 rue Saint Joseph - 83400 Hyères France<br />
Tel : +33 (0) 494 121 848 Fax : +33 (0) 494 121 849 E mail : sales@lighttec.fr
Measurement of the calibration sample = spectralon:<br />
REFLET : Scattering <strong>Measurements</strong><br />
<strong>BRDF</strong> calculated:<br />
0,3500<br />
0,3000<br />
0,2500<br />
0,2000<br />
0,1500<br />
0,1000<br />
0,0500<br />
0,0000<br />
-90,0000<br />
-78,0000<br />
-66,0000<br />
-54,0000<br />
-42,0000<br />
-30,0000<br />
-18,0000<br />
-6,0000<br />
6,0000<br />
18,0000<br />
30,0000<br />
42,0000<br />
54,0000<br />
66,0000<br />
78,0000<br />
90,0000<br />
We obtain a quasi-flat <strong>BRDF</strong> which corresponds to the fact that we have measured the calibration<br />
sample.<br />
brdf<br />
Espace Alexandra - 359 rue Saint Joseph - 83400 Hyères France<br />
Tel : +33 (0) 494 121 848 Fax : +33 (0) 494 121 849 E mail : sales@lighttec.fr
Change language