Mantis 5000 Especificaciones descargar pdf (Pagina 58)

4. Click the Baseline button.

5. At the 100%T scan prompt, select OK. The standard at the reflectance port serves as

the 100%R reference.

6. At the 0%T scan prompt when running reflectance scans, either block the sample

beam at the transmission port or replace the reflectance standard at the sample port with a

light trap. When running transmission scans, the sample beam should be blocked for the

0%T scan.

The recorded baseline correction will be effective until replaced by a follow-up baseline

scan.

Note

If a light trap is unavailable, the baseline scan can be run with the sample

reflectance port open and the outside magnetic cover to the reflectance port

installed.

8°/h Reflectance Factor Measurements (Comparison Method)

For reflectance measurements, make sure that mirror M3 is placed in the reflectance

position, closest to the sphere. Repeat the alignment procedure if the mirror has been

moved. This mirror configuration provides a focused spot size of approximately 6.5 mm

wide x 15 mm high. If a large reflectance spot is desired, such as for measurement of

fabrics or other non-homogenous samples, place mirror M3 in the transmission mirror

position. This mirror configuration provides an unfocused spot size of approximately 20

mm wide x 25 mm high. Place the mirror in the centre-mount position if an intermediate

beam size is desired.

The reflectance port is constructed at an 8° angle from the incident sample beam to

facilitate 8°/h measurements. Additionally, the DRA has a specular exclusion port - the

diffuse and specular reflectance components can be separated by removing the specular

port plug. During 8°/h reflectance measurements, the specular port plug should be

installed. The following procedure should be used to measure the hemispherical

reflectance factor of a sample:

1. Collect a Baseline scan

2. Replace the reflectance standard at the sample reflectance port with the sample. Do

not change the configuration of the integrating sphere in any other way.

3. 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

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Mantis 5000 Especificaciones Pagina 58