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Optical design

Figure 7: The optical design of the DRA

1. The sample beam hits mirror M1 and is then reflected to M2.

2. The beam travels through the lens and is focused into the transmission port,

and onto the reflectance port.

3. The reflected beam is diffused throughout the sphere before being measured

by the detector.

4. The reference beam enters the sphere directly through the reference port and is

dispersed.

5. The removable end cap has two positions:

• In the 'D' position, the angle of the beam from the normal to the sample plane

is approximately 0 degrees. Any specular component of the reflection is

reflected back through the transmission port and is deflected by the angled

lens, preventing re-entry into the sphere.

• With the cap in the 'S' position, the angle of incidence is 3° 20 min. The

specular component will hit the sphere wall and be diffused within the sphere.

The total reflectance will then be measured.

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Mantis 5000 Especificaciones Pagina 9