Mantis 5000 Specifikace stáhnout pdf (Strana 68)

6. Load the sample at the transmission port. Do not change the configuration of the

integrating sphere in any other way.

7. Click the Setup button and check the parameters. Normally, the setup parameters

for the application should match those used for the baseline scan. If using a previously

defined baseline correction, retrieve the correct baseline.

8. Click the Start button.

9. The value displayed by the instrument is the sample transmission. No data correction

is required.

Reflectance Measurements at the Centre-Mount Location (Small Spot Kit

)

For samples loaded at the centre-mount location, the DRA small spot kit can be used to

measure a particularly small test sample, a portion of a larger sample, or to increase the

variable angle measurement capabilities of the accessory. Prior to entering this procedure,

the small spot kit should be installed and aligned. Mirror M3 must always be installed at

the "T" position for small spot kit measurements.

1. Install the centre-mount lens, marked “C”, into the small spot kit lens holder. The

arrow marked on the lens should be pointing towards the sphere.

2. Darken the room and drive the instrument to 500 nm

3. Remove the transmission sample holder from the dovetail at the integrating sphere

transmission port.

4. Mount the sample onto the centre-mount sample holder, making sure it is properly

centreed and secured. Load the assembly into the integrating sphere and set the antic-

ipated angle of incidence using the attached dial.

5. Adjust the iris aperture to full open.

6. Adjust the position of the small spot kit lens assembly on its dovetail rail, changing

the distance between the “C” lens assembly and the sphere until the beam spot obtained

on the centre-mount sample is crisp and well-focused. Make sure that the beam does not

overfill the edges of the sample. In general, the centre-mount spot size and focus will be

optimized when the lens is moved away from the sphere. If it is necessary to reduce the

beam size to eliminate sample overfilling, adjust the iris diaphragm until the spot on the

sample fills approximately 75% of the entire sample surface.

7. While viewing the sample surface through the reference port, check that the sample

beam strikes the centre and does not overfill the sample at the angle selected. This step

may require use of a piece of translucent paper and will be more difficult at greater angles

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