Mantis 5000 Especificaciones descargar pdf (Pagina 57)

An integrating sphere is sensitive to small-angle scatter from the sample beam coupling

optics. Sometimes, the scattered radiation strikes the wall of the integrating sphere near

the reflectance sample port, creating a "halo" surrounding the port. This halo-effect

causes a small error in the measurement of the reflectance factor that is most significant

when measuring samples of very low reflectance. This error is easily corrected by using

the light trap zero baseline correction method discussed above.

Simple Baseline Scan for Reflectance or Transmission Measurements

Baseline scan data is recorded from the Cary WinUV Scan application. Prior to recording

the scan, make sure that mirror M3 is located in the correct position. To collect a baseline

scan:

1. Click the Setup button and set up instrument parameters as required by the intended

application. Select the %R or %T ordinate scale, depending on the type measurements

anticipated. The Beam mode should be double.

2. Select the Baseline radio button on the Baseline tab.

3. Load a Spectralon standard at the reference port and a calibrated reflectance standard,

if available, at the sample reflectance port. If a calibrated standard is unavailable for

reflectance measurements, an uncalibrated Spectralon standard can be substituted. Install

the magnetic port covers over their respective ports.

4. Click the Baseline button.

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

scan.

Zero Baseline Scan for Reflectance or Transmission Measurements

Prior to recording the scan, make sure that mirror M3 is located in the correct position.

To record a zero baseline scan:

1. Click the Setup button and set up instrument parameters as required by the application.

Select the %R or %T ordinate scale, depending on the type measurements anticipated.

The Beam mode should be double.

2. For reflectance measurements, select the Zero/baseline correction or Zero x std ref

correction radio button on the Baseline tab. For transmission measurements, Zero/

baseline correction should be selected.

3. Load a Spectralon standard at the reference port and a calibrated reflectance standard,

if available, at the sample reflectance port. If a calibrated standard is unavailable for

reflectance measurements, an uncalibrated Spectralon reflectance standard can be

substituted. Install the magnetic port covers over their respective ports.

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Mantis 5000 Especificaciones Pagina 57