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Description of the accessory

Accessory design

The DRA accessories are designed specifically to measure the reflectance or transmission

of solids, liquids, powders, or other small objects that can fit at the transmission or

sample reflectance ports. Except for the sphere detectors, the construction of each version

of the DRA is identical. Basic components of the accessory include the base plate,

integrating sphere, optics chamber and detector chamber. The basic components are

illustrated in the figure below.

Figure 9: A schematic view of the external DRA.

The optics chamber contains the transfer optics that direct the spectrophotometer beams

to their final destinations. The integrating sphere collects and measures the radiation

transmitted or reflected from the sample surface. A removable cover fits over the DRA to

provide a light-tight operating environment. The sample reflectance and reference ports

each are fitted with a separate magnetic port cover. The purposes of the covers are to

reduce the potential for stray light when the accessory is in use and to keep the

integrating sphere and standards clean when not in use.

Beam paths within the accessory are illustrated in the next figure. Light entering the

accessory is directed to one of two entrance ports on the sphere: the reference beam and

sample beam entrance ports. The sample beam entrance port is usually called the

transmission port.

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Mantis 5000 Especificaciones Pagina 10