Mantis 5000 Specifiche Scaricare il pdf (Pagina 29)

Figure 26. The polarizer installed on the polarizer mount.

You can install the Polarizer/Depolarizer into the DRA to control the plane

polarization of the light beam in a spectrophotometer. For example: if the sample

being measured is sensitive to plane polarized light e.g. liquid crystals, the

transmission of the sample will change as the plane of polarization changes. It is thus

important to control the plane of polarization of the incident beam.

To install the polarizer/depolarizer:

1. Install the DRA

into the instrument

2. Remove the optics cover.

3. Slide the Polarizer/Depolarizer onto the polarizer mount. The dial should face

away from the optical area.

4. Tighten the screw to hold the polarizer in place.

5. If necessary re-align the DRA

You must now check the alignment of the attachment

Installing the double aperture attachment

This attachment is used in conjunction with the Validate application to check that the

detector in the DRA is performing correctly. The advantage of using the Double

Aperture attachment to determine photometric accuracy is that there is no limitation

on temperature, wavelength or SBW. Refer to the online Help

for instructions on how

to use a double aperture attachment. Click here for the theory behind the use of a

double aperture accessory

Note

The default tolerance values n the Validate application are applicable to the

instrument only. An internal or external DRA accessory should not be expected

to perform to the same level of photometric accuracy.

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Mantis 5000 Specifiche Pagina 29